JP2001218359A - Circuit breaker with energization information measuring device and correction method therefor - Google Patents

Abstract

(57) [Summary] Conventionally, errors were corrected by combining a circuit breaker main body 1 and a measurement display unit 20. However, even if both are arbitrarily combined, correction is performed to obtain a measurement result with a small error. . An A / D conversion circuit (2) is connected to a measurement current transformer (13).
1 and the correction value of the error from the transformer 14 to the A / D conversion circuit 22 are stored in the first memory device 15, and the correction value of the error of the circuit after the multiplication circuit is stored in the first memory device 15. 2 in the memory device 29. At the time of measurement, the correction value stored in the first memory device 15 is input to the measurement correction unit 31, and a corrected current / voltage with a small error is output from the measurement correction unit 31. Is calculated, and the correction value stored in the second memory device 29 is input to the calculation correction unit 30 to correct the calculated power value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker with an energization information measuring device, and an energization information measuring device for measuring, as energization information, a power supply state to a load protected by the circuit breaker, attached to the circuit breaker. It is.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a circuit configuration block diagram of a conventional circuit breaker energization information measuring device disclosed in Japanese Patent Application Laid-Open Publication No. HEI 10-115139. In the figure, 1 is a circuit breaker main body, 2 is an energized main conductor for energizing a load, 3 is a switching contact for turning on and off a load current flowing in the energized main conductor 2, and 4 is a load current flowing in each energized main conductor 2. Current transformer.
5 is a rectifier circuit for rectifying the output of the current transformer 4, 6 is a peak value for detecting the instantaneous maximum value of the load current flowing through the current-carrying main conductor 2 after voltage conversion of the output voltage from the rectifier circuit and A / D conversion processing. A conversion circuit 7 is an instantaneous timing circuit that outputs a signal when the output of the peak value conversion circuit 6 exceeds a predetermined value, and 8 is an output magnitude of the peak value conversion circuit 6 at a level lower than the operation output of the instantaneous timed circuit 7. Is a short timed circuit that performs an anti-timed operation and outputs a cutoff signal.

An effective value conversion circuit 9 obtains an effective value corresponding to the effective value of the load current flowing through the current-carrying main conductor 2 after voltage-converting the output from the rectifier circuit 5 and performing A / D conversion processing.
Reference numeral 10 denotes a long time limit circuit, which does not cause the circuit breaker main body 1 to perform a cutoff operation when the current is less than the rated current due to the magnitude of the output of the effective value conversion circuit 9 but performs a reverse time limit operation when the current is equal to or higher than the rated current and outputs a cutoff signal.

[0004] Reference numeral 11 denotes a trigger circuit,
Then, upon receipt of a cutoff signal of either the short time period circuit 8 or the long time period circuit 10, the switching contact 3 is opened via the electromagnetic coil 12 to cut off the power supply to the load. Reference numeral 13 denotes a measurement current transformer for detecting a load current flowing through each current-carrying main conductor 2 separately from the current transformer 4 for detecting overcurrent, and 14 denotes a transformer for detecting a voltage between the current-carrying main conductors 2. The measuring current transformer 13 and the transformer 14 are housed inside the circuit breaker main body 1.

[0005] Reference numeral 20 denotes a measurement display unit which is mounted on the circuit breaker 1 and calculates and processes current and voltage detected by the measurement current transformer 13 and the transformer 14. This unit forms an energization information measurement device. The circuit breaker body 1 is disposed on a front surface or a side surface of the circuit breaker body 1 and is electrically connected to the circuit breaker body by a connector. The measurement display unit 20 is operated by a microcomputer (microcomputer) not shown. 21 is a current A / D for rectifying and amplifying the analog output of the current transformer 13 for measurement and converting it into a digital output.
A conversion circuit 22 is a voltage A / D conversion circuit that rectifies and amplifies the analog output of the transformer 14 and converts it into a digital output.
Reference numeral 3 denotes a maximum current value storage circuit.

Reference numeral 24 denotes a multiplying circuit for multiplying a current value output and a voltage value output to obtain electric power, 25 an integrating circuit for counting the multiplication result into an electric energy, 26 a display content selecting circuit, and 27 a display unit. A display content selection circuit 26 selects one of the calculated maximum current value, current value, voltage value, power, and power amount to be displayed on the display unit 27.

In the conventional circuit breaker energization information measuring device constructed as described above, the measurement current transformer 13 for detecting the load current flowing through the main conductor 2 and the transformer 14 for detecting the voltage are on the primary side. It is necessary to output a signal proportional to the value input to the secondary side to the secondary side. However, since the measuring current transformer 13 and the transformer 14 are miniaturized in order to be built in the circuit breaker main body 1, the iron core forming the measuring current transformer 13 and the transformer 14 becomes smaller, and the iron core becomes smaller. Due to the magnetic saturation, a signal proportional to the value input to the primary side is not output to the secondary side, and the conversion error increases.

In the measurement display unit 20, the current A / D conversion circuit 21, the voltage A / D conversion circuit 22, the multiplication circuit 24, and the multiplication circuit 25 have calculation errors such as gain errors due to offset and component precision. When the conversion errors of the measuring current transformer 13 and the transformer 14 are included, the value of the energization information displayed on the display unit 27 has a large error. Then, the correction coefficient is stored in a memory device attached to the microcomputer, and the error is corrected using the correction coefficient, thereby ensuring accuracy.

(1) A correction reference point (for example, 5%, 10%, 50% of the rating,
(100%, 120%), and theoretical output values such as voltage and power. (2) The current and voltage corresponding to the correction reference point defined in the current-carrying main conductor 2 are applied to the measurement display unit 20.
To calculate the voltage, current, power, and the like, compare the theoretical output value stored in the memory device with the calculated value, determine the correction coefficient for each item by the following formula, and store the correction coefficient in the memory device as the correction coefficient. Correction coefficient value = calculated value / theoretical output value Hereinafter, the correction coefficient value is referred to as a correction value.

At the time of actual measurement, using the correction value stored in the memory device, an operation value with a small error after correction is obtained as follows. Computed value (measured value) after correction = actual computed value (measured value) /
Correction value

[0011]

Since the conventional circuit breaker energization information measuring device is formed as described above, the correction coefficient stored in the memory device is used for the measurement variable built in the circuit breaker body 1. The conversion error of the current transformer 13 and the transformer 14 and the gain error due to the offset of the current A / D conversion circuit 21, the voltage A / D conversion circuit 22, the multiplication circuit 24, and the integration circuit 25 and the component accuracy are integrated. When the measurement display unit 20 is mounted on another circuit breaker main body 1, there is a problem that the correction coefficient in this new combination needs to be obtained again, and the correction work must be performed again.

Since the current transformers 13 for measurement are disposed close to each other in the narrow circuit breaker main body 1, the current transformers 13 are susceptible to the magnetic influence of the current of the other phase, and the phase line in which no current actually flows is provided. In addition, due to the magnetic influence of the adjacent phase line current, there is also a problem that the current is measured as though the current is flowing, albeit slightly.

The present invention has been made in order to solve such a problem. In the case where the measurement display unit 20 (power supply information measuring device) is mounted on another circuit breaker main body 1 by changing the combination to the conventional one. The purpose of the present invention is to provide a circuit breaker with an energization information measuring device attached to an energization information measuring device that obtains an accurate energization information value and displays it on a display unit, and also corrects the magnetic effect of an adjacent phase line current. And

[0014]

(1) A circuit breaker with an energization information measuring device according to claim 1 of the present invention comprises a circuit breaker main body and an energization information measuring device disposed near the circuit breaker main body. The circuit breaker body has a plurality of current-carrying main conductors,
A breaking function of performing a breaking operation in accordance with the current flowing in the current-carrying main conductor, a measuring current detecting means for detecting the current flowing in the current-carrying main conductor with a current transformer or the like, and a transformer or the like for detecting the voltage of the current-carrying main conductor. A circuit breaker main body comprising: a measuring voltage detecting means for detecting in the step (a); and a first memory for respectively storing an error correction value of the measuring current detecting means and the measuring voltage detecting means. A / D conversion means for digitally converting the detection current and the detection voltage, respectively;
A first correction unit for correcting the output current / voltage of the D conversion means, and a calculation for calculating at least power among power, power amount, power factor, etc. based on the current / voltage corrected by the first correction unit A processing unit, a second correction unit that corrects a calculation result of the calculation processing unit, and a second memory that stores a correction value that corrects a calculation error of the calculation processing unit. An energization information measuring device that corrects with the correction value of the first memory and corrects with the correction value of the second memory in the second correction unit.

(2) A circuit breaker with an energization information measuring device according to claim 2 of the present invention is the circuit breaker with energization information measuring device according to claim 1, wherein the second memory is
A second memory storing a correction value for correcting the conversion error of the A / D conversion means and a correction value for correcting the calculation error of the calculation processing unit is provided. The first correction unit stores the correction value of the first memory. The correction value of the error between the measurement current detection unit and the measurement voltage detection unit and the correction value of the conversion error of the second memory are corrected, and the second correction unit corrects the calculation error of the second memory. This is an energization information measurement device that corrects with a correction value.

(3) A circuit breaker with an energization information measuring device according to claim 3 of the present invention is the circuit breaker with energization information measuring device according to claim 1 or 2.
The energization information measurement device includes at least one of a display unit that displays the corrected measurement information such as current, voltage, and power, and a communication unit that communicates the measurement information to an external device.

(4) A circuit breaker with an energization information measuring device according to a fourth aspect of the present invention is the circuit breaker with an energization information measuring device according to any one of the first to third aspects. Alternatively, there is provided a means for generating a start signal from the inside periodically or at an arbitrary time, and correcting the offset error of the A / D conversion means with the start signal.

(5) A circuit breaker with an energization information measuring device according to a fifth aspect of the present invention is the circuit breaker with an energization information measuring device according to any one of the first to fourth aspects. The breaking function of the breaker body is a breaking function that detects a current flowing through the current-carrying main conductor with a current transformer and performs a breaking operation in accordance with the detected current, and the measuring current detecting means is a secondary side of the current transformer. The means for detecting the current flowing through the current transformer, or the measuring current detecting means is a means for providing a tertiary winding on the current transformer and detecting from the tertiary winding.

(6) A circuit breaker according to a sixth aspect of the present invention is a circuit breaker comprising the circuit breaker body according to any one of the first to fifth aspects.

(7) A circuit breaker with an energization information measuring device according to claim 7 of the present invention is the energization information measuring device according to any one of claims 1 to 5.

(8) According to an eighth aspect of the present invention, there is provided a method for correcting a circuit breaker with an energization information measuring device, comprising: a power supply capable of variably energizing an energized main conductor; A standard instrument for measuring an energization value, a communication unit for transmitting the measured value to the energization information measurement device, and a correction target obtained by adding a unit for receiving the measurement value from the communication unit to the energization information measurement device according to claim 1. When the specified power is supplied by the power supply device, the power supply information measurement device uses the measurement value of the standard meter transmitted through the communication device as a reference, and measures the current detection means for measurement. And an error correction value of the measurement voltage detecting means is calculated and stored in the first memory, and a correction value of the calculation error of the calculation processing unit is calculated and stored in the second memory.

(9) A method for correcting a circuit breaker with an energization information measuring device according to claim 9 of the present invention is described in claim 2.
A master circuit breaker that has the same configuration as that of the circuit breaker body of the first embodiment, and stores a correction value in the first memory such that a correction value of an error between the measurement current detection means and the measurement voltage detection means is within a predetermined accuracy. A correction value for correcting a conversion error of the A / D conversion means based on the correction value of the first memory, and calculating by a processing unit. Correction values for correcting errors are derived, and these correction values are stored in the second memory.

(10) According to a tenth aspect of the present invention, a method of correcting a circuit breaker with an energization information measuring device has the same configuration as the energization information measuring device of the second aspect, and the second memory has A
A master energization information measuring device storing a correction value such that a correction value for correcting a conversion error of the / D conversion means is within a predetermined accuracy is connected to the circuit breaker body of claim 2 to be corrected. Based on the correction values of the two memories, a correction value of an error between the measurement current detection means and the measurement voltage detection means is derived and stored in the first memory.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a circuit configuration of a circuit breaker with an energization information measuring device according to Embodiment 1 of the present invention. FIG. 2 is a diagram showing a correction value of the circuit breaker with an energization information measuring device of the present invention. FIG. 9 is a circuit configuration diagram at the time of a correction operation when storing a. In the figure, reference numerals 1 to 14, 20 to 27 are the same as in the description of the conventional example.

Reference numeral 28 denotes a microcomputer, and reference numeral 29 denotes a second memory device, which uses a nonvolatile memory such as an EPROM. Reference numeral 30 denotes a calculation value correction unit, 31 denotes a measurement value correction unit, and 32 denotes a communication interface (communication I / F). Reference numeral 33 denotes a connection connector for connecting the circuit breaker main body 1 and the measurement display unit 20, and reference numeral 34 denotes an external display device for remotely displaying various measurement values transmitted via the communication I / F 31. In addition to the display, the load may be controlled.

Reference numeral 15 denotes a first memory device, which is constituted by an EPROM which is a nonvolatile memory, is disposed in the circuit breaker main body 1 and is connected to the microcomputer 28 of the measurement display unit 20 by a connector 33. 41 is an external computer, 42 is a power supply device capable of variably outputting current, voltage, phase, etc., 43 is a standard meter capable of accurately measuring current, voltage, power, etc. output from the power supply device 42, and the measured values Is taken into the external computer 41.

The procedure for obtaining the correction value shown in FIG. 2 and storing it in each memory device will be described. FIG. 2 omits the cutoff trip circuit portion. For such correction, it is convenient to provide a test switch 16 and a test voltage line 44 for performing imaginary load energization. (1) When the test connector 33 provided with the terminal of the correction voltage line 44 is inserted, the respective wires of the circuit breaker 1 and the measurement display unit 20 are connected, and the test switch 16 is opened to open the transformer 14. , A voltage is directly applied from the power supply 42. (2) The microcomputer 28 and the external computer 41 are connected via the communication I / F 32 so that they can talk with each other.

(3) At the time when both computers start up, information such as the model and rated current value of the circuit breaker and the attribute information of the measurement display unit 20 are input from the keyboard of the external computer 41 and the microcomputer. The data is stored in the first memory device 15 and the second memory device 29 via the memory 28. The calculated value correction unit 30 and the measurement value correction unit 31 are set to 1.00 as an initial correction value. (4) Then, each correction reference point of the rated current of the circuit breaker 1 from the power supply device 42 (for example, 5%, 10%, 50%, 100%, 12% of the rating, which is each correction point described above)
0%) is supplied to the current-carrying main conductor 2.

(5) The current of each phase at this time is
3 is compared with the output value from the current A / D conversion circuit 21 via the current transformer 13 for measurement, and a correction coefficient (correction coefficient = calculated value / output value of the standard meter) becomes equal within an allowable error. ) Is calculated by the external computer 41 for each phase and each correction reference point, and is stored in the first memory device 15 in the form of, for example, a look-up table. (6) Similarly, the correction coefficient is set to the first voltage measurement value.
In the memory device 15. (7) In this way, the correction coefficient stored in the first memory device 15 is set for each current transformer 13 for measurement and each transformer 14.

(8) Next, the correction coefficient in the first memory device 15 is taken into the measured value correction section 31. Since the calculated value is corrected by the correction coefficient of the measured value correcting unit 31 when the power is supplied by this input, the calculated value of the measured value correcting unit 31 is small (theoretically zero). (9) Then, a voltage and a current are simultaneously supplied from the power supply device 42 for each correction reference point, and the output value of the standard instrument 43 and the output value of the multiplying circuit 24 at this time become equal within an allowable error. A correction coefficient (correction coefficient = calculated value / standard instrument output value) is obtained and stored in the second memory device 29.
The obtained correction coefficient becomes a correction coefficient for the circuit after the output of the measurement value correction unit 31. (10) Since it is an AC power value, a correction coefficient based on the power factor is also obtained at the same time and stored in the second memory device 29 to complete the correction operation. The correction coefficient stored in the second memory device 29 is set for each power computing element.

The operation of an energization information measuring device in which a circuit breaker in which a correction coefficient is stored in a first memory device 15 and a measurement display unit in which a correction coefficient is stored in a second memory device 29 is combined. This will be described with reference to FIG. (1) When the microcomputer 28 is started up by connecting the circuit breaker 1 and the measurement display unit 20 via the connection connector 33, the microcomputer 28 stores the unique attribute information of the circuit breaker stored in the first memory device 15. And checks whether it can be connected by comparing it with its own attribute information.
If the attribute information indicates a difference and connection is impossible, an error is displayed on the display unit 27.

(2) If there is no error display and connection is possible, the correction coefficient of the measured value stored in the first memory device 15 is taken into the measured value correction section and overwritten. Further, the correction coefficient of the operation value stored in the second memory device 29 is taken into the operation value correction unit and overwritten. (3) The energization of the circuit breaker 1 is measured and calculated in consideration of each correction coefficient, and the value of the item selected for display is displayed on the display unit 27. (4) It is also possible to distribute the result of measurement and calculation taking into account the correction coefficient to an external display device via a communication I / F for connecting to the external computer 41 to obtain the correction coefficient.

FIG. 3 shows an example of the process of the above-mentioned correction processing. In this case, for the sake of simplicity, description will be made using errors instead of correction coefficients. In this figure, e1 = CT error e2 = Current A / D conversion circuit error e3 = Multiplication circuit error

In step (2), a correction value for the error (-e1-e2) is stored in the first memory device.
In the above step (3), (-e3) is stored in the second memory device.
Is stored. Therefore, the correction value for the error (−e1−e2) is finally stored in the first memory device, and the correction value for the error (−e3) is stored in the second memory device.

The first memory device (-e1-e)
The correction value for the error of 2) is not divided into the correction values of -e1 and -e2, but is a correction value of the error of the current / voltage measurement system including the current transformer / transformer. The correction value for the error of (−e3) of the second memory device is:
This is a correction value for an error of the power measurement system for calculating power based on the corrected current and voltage.

Each of the correction reference points of the rated current and the rated voltage (for example, 5% of the rated value,
(0%, 50%, 100%, and 120%), the correction coefficient is set for each phase. In the middle of the correction coefficient, the accuracy is maintained by using the correction coefficient calculated by complementation. In the above description, the number of correction reference points is set to five. However, if a highly accurate apparatus is desired, it can be dealt with by increasing the number of correction reference points.

Since the measuring current transformers 13 are arranged close to each other in the circuit breaker main body 1, they are susceptible to the magnetic influence of the currents of the other phases. Even if one phase of the current transformer 13 has zero current, the secondary output of the measuring current transformer 13 is generated, and the current A /
There is a case where an erroneous measurement is performed via the D conversion circuit 21. This means that the first memory device 15 can store a correction count for canceling the offset value of the current transformer 13 for measurement when the current is zero by outputting a single-phase current from the standard meter 43 at the time of correction.

In the correction of the first embodiment, when the combination of the circuit breaker 1 and the measurement display unit 20 is corrected, the current A / D conversion circuit 21 and the voltage of the measurement display unit 20 which are combined at the time of correction are corrected. Since the correction coefficient including the offset and gain error of the A / D conversion circuit 22 is stored in the first memory device 15 on the circuit breaker main body side, the current transformer / transformer stored in the first memory device 15 is stored. Although the accuracy of the correction coefficient for the detector deteriorates, any error within an allowable range may be used.

Therefore, when the circuit breaker 1 and the measurement display unit 20 are combined and corrected, the above error does not occur. However, when the circuit breaker 1 and the measurement display unit 20 are combined at random, a slight error occurs. Combinations are possible, though appearing in the measurement results and reducing the measurement accuracy.

Embodiment 2 As described in the first embodiment, in the correction of the combination of the circuit breaker 1 and the measurement display unit 20 in the first embodiment, the current A / D conversion circuit 2 of the measurement display unit 20 combined at the time of correction is used.
1. The correction coefficient including the offset and gain error of the voltage A / D conversion circuit 22 is stored in the first memory device 15. When the circuit breaker 1 and the measurement display unit 20 are combined at random, errors due to offsets and gain differences between the current A / D conversion circuits 21 and the voltage A / D conversion circuits 22 appear in the measurement results and the measurement accuracy is reduced. I do.

In the second embodiment, a method for reducing the combination error will be described with reference to FIG. FIG. 4 is a connection diagram when a correction value is set and stored in each memory device of the uncorrected circuit breaker and the energization information measuring device according to the second embodiment of the present invention. In the figure, 1-3, 13-15, 20
22, 22, 27 to 32, and 41 to 44 are the same as in the description of the conventional example.

Reference numeral 100 denotes a master circuit breaker, which has the same structure as the circuit breaker 1, but has a first memory device 115 in which a measuring current transformer 13 and a measuring current transformer 13 built in the master circuit breaker 100 are provided. A correction coefficient for increasing the measurement accuracy of the transformer 14 is stored. Compared to the description of the first embodiment, the number of correction reference points is increased and the number of digits of the correction coefficient value is increased.

An arithmetic processing unit 36 includes the maximum current value storage circuit 23, the multiplication circuit 24, the accumulation circuit 25, the display content selection circuit 26, and the like described in the first embodiment, and has a simple structure. Therefore, it is numbered.

Reference numeral 200 denotes a master measurement unit, which has the same structure as that of the measurement display unit 20, but the second memory device 229 stores each A / A of the master measurement unit 200.
A correction coefficient is stored in which the offset errors of the D converters 21 and 22 and each arithmetic circuit are absorbed to improve the accuracy of the arithmetic result. In order to increase the accuracy, the number of correction reference points is increased, and the number of digits (effective digits) of the correction coefficient value is increased. A switch 45 switches the connection between the master measurement unit 200 and the uncorrected measurement display unit 20 to the external computer 41.

The master circuit breaker 100 and the uncorrected measurement display unit 20 are connected and connected to the external computer 41, the power supply unit 42, and the standard instrument 43, and the master measurement unit 200 and the uncorrected circuit breaker 1 are connected to the respective connectors. Connect using combination. Uncorrected circuit breaker 1 and master circuit breaker 10 so that the same current can flow.
0 main conductors 2 are connected in series. Further, a test voltage line 44 is connected in parallel so that the same voltage is applied from the power supply device 42 to each of the transformers 14.

(1) With the connection as described above, power is supplied from the power supply 42 to the correction reference point. (2) The output of the master circuit breaker 100 at this time is received by the measurement display unit 20 to be corrected, and the measured value of the standard meter 43 and the output values of the A / D conversion circuits 21 and 22 are received via the external computer 41. Are calculated, and a correction value is calculated so that both become equal.

(3) The correction values include the correction values of both the current transformer 13 and the transformer 14 of the master circuit breaker 100 and the A / D conversion circuits 21 and 22 of the measurement display unit 20. Therefore, A /
The correction values of the D conversion circuits 21 and 22 are calculated, and (calculated correction value)-(standard first memory device 115
Correction value) = (correction value of A / D conversion circuits 21 and 22 of measurement display unit 20) The correction value of this A / D conversion circuit is stored in second memory device 29.

(4) Next, the measured value correcting unit 31 sums the correction values of the correction value of the first memory device 115 and the correction value of the second memory 29 (to be the correction value of the current / voltage measurement system). ). By this correction, the output from the measurement value correction unit 31 is a current / voltage output with a small error.

(5) Using the output of the current and voltage having a small error, the correction of the calculation unit such as the power and the power factor is performed as follows. A calculation process is performed by using the output of the current and voltage having a small error as an input, and a correction value is calculated so that the measurement value (calculation value) output to the display unit 27 and the measurement value of the standard instrument 43 become equal. The correction value is set and stored in the second memory device 29. The second memory device 29 serves as a correction value for the power / power factor calculation system.

(6) Next, the changeover switch 45 is switched to the master measuring unit 200 side, and energization of the correction reference point is performed to the uncorrected circuit breaker body 1. (7) The master measurement unit 200 receives the uncorrected outputs of the measurement current transformer 13 and the transformer 14 of the circuit breaker 1 and, via the external computer 41, the measurement values of the standard meter 43 and the A / D conversion circuit. Compare the output values of 21 and 22 and
The correction value is calculated so that both are equal.

(8) Since this correction value includes the correction values of both the current transformer 13 and the transformer 14 of the circuit breaker 1 and the A / D conversion circuits 21 and 22 of the master measurement unit 200, , The measuring current transformer 13 of the circuit breaker 1
The correction value of the transformer 14 is calculated. (Calculated correction value)-(standard second memory device 229)
Current / voltage correction value) = (current transformer 13 of circuit breaker 1)
(Correction Value of Transformer 14) The correction values of the current transformer 13 and the transformer 14 of the circuit breaker 1 are stored in the first memory device 15. In this way, a correction value with a small error is set in the first memory device 15 of the uncorrected circuit breaker 1.

FIG. 5 shows an example of the above-described correction process.
As shown in FIG. 6 and FIG. In this case, for the sake of simplicity, description will be made using errors instead of correction coefficients. In these figures, e1 = CT error of circuit breaker 1 e2 = Error of current A / D conversion circuit of measurement display unit 20 e3 = Error of multiplication circuit of measurement display unit 20 E1 = 100 of master circuit breaker The known error of CT13 E2 = the known error of the current A / D conversion circuit of the master measurement unit 200 E3 = the known error of the multiplication circuit of the master measurement unit 200

1. As shown in FIG.
In the case where 0 is combined with the unadjusted measurement display unit 20, (-E1) is stored in the first memory device 115, and an error of (E1 + e2) appears in step (1). Assuming that the error is (0), (−E1-e
The correction value of 2) is calculated. From this correction value, a known (−
When E1) is subtracted, (-e2) which is the "correction value of the A / D conversion circuits 21 and 22 of the measurement display unit 20" is obtained. Therefore, (−e2) = (− E1−e2) − (− E1) is calculated, and the correction value for the error of (−e2) is stored in the second memory device 29. Next, the above step (3)
Then, the correction value for the error of (-e3) is stored in the second memory device 29. Therefore, (−e2, −e3) is finally stored in the second memory device 29.

2. In the case where the unadjusted circuit breaker 1 and the master measurement display unit 200 are combined as shown in FIG. 6, (−E2−E3) is included in the memory device 229, and an error of (e1 + E2) appears in step (1). In step (2), assuming that this error is (0), (-e1-E
The correction value of 2) is calculated. From this correction value, a known (−
When E2) is subtracted, (-e1) which is the "correction value of the current transformer 13 and the transformer 14 of the circuit breaker 1" is obtained. Therefore, (−e1) = (− e1−E2) − (− E2) is calculated, and the correction value for the error of (−e1) is stored in the first memory device 15.

Next, when the circuit breaker body 1 and the measurement display unit 20 are combined, all errors are corrected as shown in FIG.

The erroneous current output of the measuring current transformer 13 due to the influence of the magnetic field of the other phase when the current of one phase is set to zero is as follows:
A correction value for canceling this erroneous output is set in the first memory device 15 for each phase. Hereinafter, the correction values for each correction reference point are sequentially set and stored in the first memory device 15 and the second memory device 29.

As described above, since the circuit breaker 1 and the measuring unit 20 for which the correction values are set are within a certain error range, a predetermined value is obtained for any combination of the circuit breaker 1 and the measuring unit 20. Accuracy can be maintained.

Embodiment 3 FIG. FIG. 8 is a circuit configuration block diagram of a circuit breaker energization information measuring device according to Embodiment 3 of the present invention. In the figure, 1-3, 13-15, 20-
Reference numerals 22, 27 to 32, and 36 are the same as those described in the second embodiment.

21a is an input from the measuring current transformer 13,
An input circuit 22a rectifies and amplifies the input from the transformer 14, respectively. The input circuits 21a and 22a are the A / D converters 21 and 22 of the above-described conventional device and the first and second embodiments.
Is also provided, but the explanation is omitted. The amplification circuits of the input circuits 21a and 22a change with time in the gain / offset value, causing measurement errors over a long period of time.
The invention of the third embodiment remedies such a change with time.

Reference numeral 37 denotes a digital / analog converter (D / A)
Converters) and 38 are reference voltages, which are obtained from the microcomputer 28 or the constant voltage IC. The D / A converter 37 has a reference voltage 38
Is converted into an analog voltage and applied to the input side of the input circuits 21a and 22a. Initial input circuit 21
a, 22a gain / offset correction
3 and the reference voltage 38 with no input from the transformer 14.
The gain / offset correction value is determined so that the error with respect to the above becomes zero, and is stored in the second memory device 29. A normal measurement result is output in consideration of the gain / offset correction value and other correction values.

Next, the temporal correction of the gain / offset of the input circuits 21a and 22a will be described. During normal current / voltage measurement, the D / A converter 37 is not operated. When there is a gain / offset correction signal from the microcomputer 28, the input from the measuring current transformer 13 and the transformer 14 is ignored, and the gain / offset correction value is set so that the error with respect to the reference voltage 38 becomes zero. It is obtained again, and the storage of the second memory device 29 is updated to a new gain / offset correction value.

The update timing of the gain / offset correction value is performed at regular intervals (for example, one day, ten days, or one month) using the timer function of the microcomputer 28. Also,
The gain / offset correction processing can be kicked from an external computer using a communication line.

As described above, the reference voltage 38 is input to the input side of the input circuits 21a and 22a via the D / A converter 37, and the gain / offset values of the input circuits 21a and 22a are periodically corrected and updated. So that the input circuit 21a,
The change over time of the gain / offset value of the amplifier circuit 22a can be eliminated.

Embodiment 4 In the fourth embodiment, the means for detecting the measuring current is changed by changing the circuit of the measuring current transformer in the circuit breaker body. FIG. 9 shows an example thereof. Reference numeral 51 denotes a second current transformer, in which the output current of the current transformer 4 for overcurrent detection is used as the primary input and the secondary output is input to the A / D conversion circuit 21. Let it. As described above, since the second current transformer 51 does not directly contact the power supply voltage, the insulation can be simplified, the size can be reduced, and the second current transformer 51 can be easily stored in the circuit breaker body.

FIG. 10 shows another example, in which a current transformer 52 has a tertiary winding 52a, and this tertiary winding 52a is used for detecting a measuring current. As described above, the detection of the overcurrent and the detection of the measurement current can be realized by one current transformer 52, so that the installation space can be reduced and the circuit breaker body 1 can be downsized.

[0066]

As described above, according to the present invention, it is possible to arbitrarily combine the circuit breaker body with the attached energization information measuring device.

[Brief description of the drawings]

FIG. 1 is a circuit configuration block diagram of a circuit breaker with an energization information measuring device according to Embodiment 1 of the present invention.

FIG. 2 is a circuit configuration diagram at the time of correction when the correction value of the circuit breaker with the energization information measuring device according to the first embodiment of the present invention is obtained and the correction value is stored.

FIG. 3 is a diagram illustrating operation steps of error correction of the circuit breaker with the energization information measuring device according to the first embodiment of the present invention.

FIG. 4 is a connection diagram when setting and storing a correction value of an uncorrected circuit breaker and an energization information measuring device according to Embodiment 2 of the present invention.

FIG. 5 is a diagram illustrating an operation step in a case where an error is corrected by combining a master circuit breaker according to a second embodiment of the present invention and an uncorrected energization information measuring device.

FIG. 6 is a diagram illustrating operation steps in a case where an error is corrected by combining an uncorrected circuit breaker and a master energization information measuring device according to a second embodiment of the present invention.

FIG. 7 is a diagram illustrating a state of error correction when a corrected circuit breaker and a corrected energization information measuring device according to Embodiment 2 of the present invention are combined.

FIG. 8 is a circuit configuration block diagram of a circuit breaker with an energization information measuring device according to Embodiment 3 of the present invention.

FIG. 9 is a circuit configuration block diagram of a circuit breaker with an energization information measuring device according to Embodiment 4 of the present invention.

FIG. 10 is a circuit configuration block diagram of a circuit breaker with an energization information measuring device according to Embodiment 4 of the present invention.

FIG. 11 is a circuit configuration block diagram of a conventional circuit breaker with an energization information measuring device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Circuit breaker main body 2 Current-carrying main conductor 13 Current transformer for measurement (measurement current detection means) 14 Transformer (measurement voltage detection means) 15 First memory device (first memory) 20 Measurement display unit (current supply information) Measuring device) 21 current A / D conversion circuit 22 voltage A / D conversion circuit 21a, 22a input circuit 27 display unit 28 microcomputer 29 second memory device (second memory) 30 calculation value correction unit (second correction unit) Reference Signs List 31 Measurement value correction unit (first correction unit) 32 Communication interface 34 External display device 33 Connector 36 Operation processing unit 37 D / A converter 41 External computer 42 Power supply device 43 Standard instrument 44 Test voltage line 45 Switch 51 52 Current transformer for measurement 52a Tertiary winding 100 Master circuit breaker 115 First memory device 200 Master measurement unit 2 9 the first memory device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01H 73/00 H01H 73/00 Z H02H 3/02 H02H 3/02 FG

Claims (10)

[Claims] The present invention comprises a circuit breaker main body and an energization information measuring device arranged in the vicinity of the circuit breaker main body. The circuit breaker main body has a plurality of energized main conductors. A breaking function of performing a breaking operation, and a measuring current detecting means for detecting a current flowing through the current-carrying main conductor with a current transformer or the like,
A circuit interrupter comprising: a measuring voltage detecting means for detecting the voltage of the current-carrying main conductor with a transformer or the like; and a first memory for storing an error correction value of the measuring current detecting means and the measuring voltage detecting means. And the above-mentioned energization information measuring device,
A / D for digitally converting the detection current and the detection voltage respectively
D conversion means, a first correction unit for correcting the output current / voltage of the A / D conversion means, and power / power amount / power factor based on the current / voltage corrected by the first correction unit. And a second memory for storing at least a correction value for correcting a calculation error of the calculation processing unit, a second correction unit for correcting a calculation result of the calculation processing unit, and a second memory for storing a correction value for correcting a calculation error of the calculation processing unit. A first correction unit that corrects with a correction value of the first memory; and a second correction unit that corrects with a correction value of the second memory. Circuit breaker with device. 2. The circuit breaker with an energization information measuring device according to claim 1, wherein the second memory corrects a correction value for correcting a conversion error of the A / D converter and a calculation error of the calculation processing unit. And a second memory storing a correction value to be corrected, wherein the first correction unit calculates a correction value of an error between the measurement current detection unit and the measurement voltage detection unit of the first memory and the second memory.
An energization information measuring device that corrects with a correction value of a conversion error of a memory, and wherein the second correction unit corrects the correction value with a correction value that corrects an operation error of the second memory. Circuit breaker. 3. A circuit breaker with an energization information measuring device according to claim 1 or 2, wherein a display unit for displaying corrected measurement information such as current, voltage and power, and an external device for displaying the measurement information. A circuit breaker with an energization information measurement device, wherein at least one of the communication means for communicating with the energization information measurement device is provided. 4. The circuit breaker with an energization information measuring device according to claim 1, wherein a start signal is generated from the outside or the inside of the circuit breaker periodically or at an arbitrary time. A circuit breaker with an energization information measuring device, comprising means for correcting an offset error of the D conversion means. 5. The circuit breaker with an energization information measuring device according to claim 1, wherein the breaking function of the circuit breaker main body detects a current flowing in the current-carrying main conductor with a current transformer. And a breaking function for performing a breaking operation in accordance with the detected current, wherein the measuring current detecting means detects the current flowing to the secondary side of the current transformer, or the measuring current detecting means comprises the current transformer A circuit breaker with an energization information measuring device, characterized in that a tertiary winding is provided on the rectifier and means for detecting the tertiary winding is used. 6. A circuit breaker comprising the circuit breaker body according to claim 1. 7. An energization information measuring device according to claim 1, wherein: 8. A power supply device capable of variably applying a specified current to a current-carrying main conductor, a standard instrument for measuring a specified current value of the power device, and a communication means for transmitting the measured value to the current information measuring device. An energization information measuring device according to claim 1, wherein said energization information measuring device is provided with a means for receiving a measurement value from said communication means. Is based on the measurement value of the standard instrument transmitted via the communication means,
Calculating an error correction value of the measurement current detection means and the measurement voltage detection means and storing the error correction value in the first memory, and calculating a correction value of a calculation error of the calculation processing unit and storing the correction value in the second memory; A method for correcting a circuit breaker with an energization information measuring device, characterized in that: 9. A correction value which is the same as that of the circuit breaker body according to claim 2, wherein a correction value of an error between the measuring current detecting means and the measuring voltage detecting means is within a predetermined accuracy in the first memory. Is connected to the energization information measuring device according to claim 2 to be corrected, and a correction value for correcting a conversion error of the A / D converter is derived based on the correction value of the first memory. And a correction value for correcting a calculation error of the calculation processing unit, and the correction value is stored in a second memory. 10. A master having the same configuration as the energization information measuring device according to claim 2, wherein the second memory stores a correction value for correcting a conversion error of the A / D converter within a predetermined accuracy. The energization information measuring device is connected to the circuit breaker body of claim 2 to be corrected, and the correction value of the error of the measuring current detecting means and the measuring voltage detecting means is calculated based on the correction value of the second memory. A method for correcting a circuit breaker with an energization information measuring device, wherein the circuit breaker is derived and stored in a first memory.