KR102077217B1 - A load breaking device by checking ground using earth leakage circuit breaker - Google Patents

Abstract

If the ground terminal (or ground wire) is discontinuous, turn on the circuit breaker's test switch and turn off the power by the circuit breaker. The present invention relates to a load interruption device based on a power breaker operation by detecting a ground break, the power input unit receiving a commercial power; A power breaker to cut off power supplied to the load; A power line detecting unit sensing a voltage of an input line of the power and outputting a detection signal; A detector for detecting a ground continuity or ground discontinuity state by receiving a detection signal; And a relay unit for operating the power interrupting unit according to the control of the detection unit.
By the above device, if the ground disconnection is detected by driving the test switch of the power circuit breaker to cut off the power, it is possible to use a low-voltage relay that can drive only the test switch even if the commercial voltage or load current is large, through which It can be lightened.

Description

Power breaker operation based load breaker detection by ground break detection {A load breaking device by checking ground using earth leakage circuit breaker}

The present invention always checks the grounding continuity of the ground terminal or the ungrounded state of the ground terminal in the power supply or power distribution unit for providing AC power, if the ground is not grounded using the power supply device or power The present invention relates to a power interrupter operation based load interruption device by grounding disconnection, which disconnects power from a distribution device.

Particularly, in the present invention, when the ground terminal (or ground wire) is discontinuous, the power breaker operation by grounding disconnection sensing turns on and off the power by the ground fault breaker by turning on the test switch of the ground fault breaker. It relates to a base load blocking device.

Electricity is an indispensable resource in modern life, but it can also cause fatal injuries, such as loss of life if an electric shock occurs. In addition, when operating electrical equipment or performing maintenance, such as industrial sites, discontinuity between the power line and the ground of the electrical machine is often generated, the operator is often subjected to electric shock disaster or burns. In particular, when checking and repairing work in the high voltage transmission and distribution lines or in the live state of the equipment, discontinuity with the ground in the electrical machine may cause fatal accidents and equipment failure.

In order to prevent such an electric shock accident, it is essential to install a grounding facility and an earth leakage breaker. In the case of grounding, check whether the grounding state is always maintained continuously. In addition, when a grounding type and a non-grounding type are mixed, a blind spot for preventing an electric shock such as an inoperability of an earth leakage breaker may occur.

As part of a scheme for preventing such an electric shock, various devices for checking the continuity of the ground line have been used. A surge protector capable of judging the ground state [Patent Document 1], a device for displaying a resistive ground state [Patent Document 2], a device for detecting a ground fault of an electronic product [Patent Document 3], absorbing or removing electromagnetic waves Techniques such as ground check outlets [Patent Document 4] are emerging.

In addition, when the ground terminal (or ground wire) is discontinuous, a technique for grounding disconnection detection and a power protection device is provided, which not only cuts off the power of the electric device to prevent electric shock, but also prevents power supply to the electric device. There is [patent document 5]. Description of the prior art is shown in FIGS. 1 and 2.

As shown in FIG. 1 or FIG. 2, in the prior art, all currents passing through the power interrupter 180 such as an earth leakage breaker are supplied to the load through the relay unit 150. At this time, the control unit 140 determines whether or not the ground continuity, and if it is determined that the non-grounded state, the relay unit 140 is turned off (off) to cut off the current supplied to the load. That is, the prior art cannot switch off the operation of the power cutoff unit 180 when the power supply ground line is not in a normal ground state.

However, each of the relays 151a of the relay unit 150 of the prior art is a small low voltage relay, and interrupts the power supplied to the load by interrupting the contact point. In this case, the small low voltage relay 151a typically has a contact point for intermittent small powers of less than 12V and 1A, and a voltage applied between both ends of the contact is also less than 100V. Therefore, in order to be applied to high-voltage household electrical appliances such as electric appliances or appliances (for example, appliances or appliances having a commercial voltage of 220 V to 380 V and a load current of 10 A or more) and industrial electric appliances, a relay having a large capacity contact suitable for this is used. Should be used. For this reason, the size of relay should be enlarged. Therefore, the miniaturization of the relay has been an obstacle to the use of the ground break detection device using the prior art in an actual industrial field. That is, the small low voltage relay acts as a cause of failure such as fusion of the contact, breakdown of the insulation, and the like.

In addition, even if the power supplied to the load by the relay unit 150 is cut off as shown in the prior art, either one of the two lines is still connected. Therefore, the load is being supplied with commercial power, which means that the risk of leakage may not be eliminated.

In addition, according to the prior art, the power input unit 110 is used as the outlet plug type of the three-pole structure (P, N, G) at the site of use, or is supplied with power in a state connected to the terminal block. In addition, the structure is to supply power to the load. When the power input unit 110 is a three-pole outlet plug type, the three poles P, N, and G of the outlet and the plug are not simultaneously connected. In other words, the P-N connection conductors are connected first, and the G-contact contacts, which are installed and connected to the side of the plug outlet, may be connected even a little later. In this case, the ground disconnection detecting apparatus of the prior art has a problem of blocking the load or displaying the ground disconnection by determining that the ground is disconnected.

In addition, the ground disconnection detection device shown in the prior art is composed of a plurality of semiconductor elements such as a microprocessor, a power supply unit, a power line detection unit and an electronic signal processing circuit. Therefore, the prior art has a problem that it is not possible to determine whether to operate by detecting the actual ground line disconnection state.

Korean Registered Patent Publication No. 10-0941962 (August 12, 2010) Korean Unexamined Patent Publication No. 10-2003-0083472 (published Oct. 30, 2003) Korea Patent Publication No. 10-0689032 (2007.03.08. Notification) Korean Patent Publication No. 10-0407770 (As of December 1, 2003) Korea Patent Publication No. 10-1705090 (August 09, 2017)

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems described above, and when the ground disconnection is detected, the power breaker operation by grounding disconnection detection turns off the load power by turning on a test switch of a power circuit breaker such as an earth leakage breaker. It is to provide a base load blocking device.

In addition, an object of the present invention is to provide a power circuit breaker operation-based load blocking device by detecting the ground break, which delays the relay operation signal and transmits it after a predetermined time when the ground break is detected.

In addition, an object of the present invention is to provide a test switch between the ground line to the ground of the G line of the power line consisting of P line, N line, G line (ground line), to turn on (off) the ground of the G line ( It is to provide a load breaker based on power breaker operation by detecting ground break.

In order to achieve the above object, the present invention relates to a power interrupter operation-based load blocking device by detecting a ground break, comprising: a power input unit receiving commercial power; A power breaker to cut off power supplied to the load; A power line detecting unit sensing a voltage of an input line of the power and outputting a detection signal; A detector for detecting a ground continuity or ground discontinuity state by receiving a detection signal; And a relay unit for operating the power interrupting unit according to the control of the detection unit.

In addition, the present invention is a power circuit breaker operation-based load blocking device by detecting a ground break, wherein the relay unit is connected in parallel to the contact of the test switch of the power breaker, characterized in that for connecting or disconnecting the contact of the test switch do.

In addition, the present invention, in the power circuit breaker operation-based load blocking device by detecting the ground break, the detection unit detects the ground discontinuity state, repeatedly detects the ground discontinuity state at a predetermined delay time interval, the predetermined minimum When it detects more than the number of repetition, it is characterized in that for outputting the control signal to the relay unit.

In addition, the present invention is a power circuit breaker-based load blocking device by detecting the ground break, characterized in that the minimum number of repetitions is more than two.

In addition, the present invention provides a power circuit breaker operation based load breaker by detecting a ground break, comprising a ground break test switch on a ground line of the power input unit, and one contact of the ground break test switch is a ground line of the power input unit. Is connected to, the other contact is characterized in that configured to contact with the ground.

In addition, the present invention is a power circuit breaker operation-based load blocking device by detecting the ground break, the ground line of the power input unit is connected to the ground line of the power output unit, the ground line of the power output unit is grounded to the substrate of the load, the load The disconnect device further includes a ground break test switch, wherein the ground break test switch includes an on / off switch, one contact of the switch is grounded to ground, and the other contact is connected to the substrate ground of the load. .

As described above, according to the load breaker operation based on the circuit breaker detection by the ground break detection according to the present invention, when the ground disconnection is detected by driving the test switch of the power breaker to cut off the power, even if the commercial voltage or load current is large It is possible to use a low voltage relay that can drive only a test switch, and this results in a compact and lightweight effect. In addition, because of the characteristics of the power circuit breaker, such as a circuit breaker cuts both lines, it is possible to fundamentally eliminate the risk of electric shock by blocking all of the voltage current supplied to the load.

In addition, according to the load-breaking device based on the operation of the power circuit breaker according to the ground break detection according to the present invention, even if the ground break is detected, by delaying the relay operation signal, the continuity of the ground can be confirmed, and disturbances such as chattering generated during power connection It is possible to minimize the malfunction caused by the, thereby obtaining an effect that can improve the reliability of the device product.

In addition, according to the load-breaking device based on the operation of the power circuit breaker by the ground break detection according to the present invention, by providing an on / off switch to the ground line of the power supply, it is possible to test the detection of ground disconnection and normality of the power disconnection circuit Is obtained.

1 and 2 is a circuit diagram of the configuration of a load blocking device according to the prior art.
3 is a circuit diagram of a power circuit breaker operation-based load interruption device by ground break detection according to a first embodiment of the present invention.
4 is a circuit diagram of a power input unit according to a first embodiment of the present invention.
5 is a circuit diagram of a power interruption unit according to a first embodiment of the present invention.
6 is a circuit diagram of a power output unit according to the first embodiment of the present invention.
7 is a circuit diagram of a noise filter unit according to a first embodiment of the present invention.
8 is a circuit diagram of a power line detecting unit according to a first embodiment of the present invention.
9 is a graph illustrating a sense signal detected for an input power source according to a first embodiment of the present invention.
10 is a circuit diagram of a detector according to a first embodiment of the present invention.
11 is a table showing a state determination and a control signal according to a detection signal according to the first embodiment of the present invention.
12 is a circuit diagram of a relay unit according to the first embodiment of the present invention.
13 is a circuit diagram of a DC power supply unit according to the first embodiment of the present invention.
Fig. 14 is a circuit diagram related to grounding according to the third embodiment of the present invention.
15 is a view showing a grounding type according to an embodiment of the present invention.
Figure 16 is a circuit diagram related to grounding according to the fourth embodiment of the present invention.

Hereinafter, specific contents for the practice of the present invention will be described with reference to the drawings.

In addition, in describing this invention, the same code | symbol is attached | subjected and the repeated description is abbreviate | omitted.

First, a schematic configuration of a load breaker based on a power breaker operation by detecting ground breaks according to a first embodiment of the present invention will be described with reference to FIG. 3.

As shown in Figure 3, the power circuit breaker operation-based load blocking device 100 by detecting the ground break of the present invention is a power interrupter 20 for cutting off power such as a power input unit 10, an earth leakage breaker receiving commercial power. The power output unit 30 outputs the input commercial power to the load 200, the noise filter unit 40 removing noise of the input power, and the power line detection unit 50 sensing the voltage of the input line of the power. And a detection unit 60 for receiving a detection signal and detecting a ground continuity or ground discontinuity state, and a relay unit 70 for turning on / off a test switch of the power cut-off unit 20 under the control of the detection unit 60. . Additionally, the display unit 80 may further include a display unit 80 for outputting a detection result of the detector 60 or a DC power supply unit 90 for converting and supplying input power to DC power.

First, the power input unit 10 receives an AC power (for example, AC 200V) that is an input power. As shown in FIG. 4, the power input unit 10 includes a power input line N1 and P1 and a ground line (or neutral line) G1. Preferably, the input lines N1 and P1 are lines for inputting AC power as two lines, and the ground line G1 is a line for grounding.

Preferably, the power input unit 10 is externally configured in the form of a plug, inserted into a power supply or power distribution device (not shown) to which AC power is supplied, and a power supply device or power distribution device (not shown). AC power is supplied from the That is, an input terminal and a ground terminal are provided at the ends of the input lines N1 and P1 and the ground line G1, and the corresponding input terminal and the ground terminal are the power terminal and ground of the power supply or power distribution device (not shown). It is connected to the terminal. Ground line (G) is connected to the ground terminal of the power supply or power distribution device (not shown), it is grounded (earth).

Next, the power cutoff unit 20 is a device for cutting off power such as an earth leakage breaker. As shown in FIG. 3, the power cutoff unit 20 is provided between the power input unit 10 and the power output unit 30.

As shown in FIG. 5, the power cutoff unit 20 is a power cutoff device provided between the input lines N1 and P1 and the output lines N2 and P2 to connect or cut off power. It is composed of an earth leakage breaker.

That is, the power cut-off unit 20 separates the opening and closing mechanism 23 for opening and closing the input lines N1 and P1, the ZCT or image current transformer 24 for detecting a current value above the rated sensitivity, and the opening and closing mechanism 23 when the current flows. It consists of the separation mechanism 25 which opens (and opens), and the test switch 26 which tests a ground fault interruption function. In addition, a ground fault indicator 29 may be further provided to indicate a ground fault state. The configuration as described above is an example of the configuration of a conventional earth leakage breaker.

In particular, the test switch 26 is constituted by a switch that turns on / off the connection contact 27 to the disconnect mechanism 25 of the input lines N1 and P1. That is, the test switch 26 is configured to drive the disconnect mechanism 25 by turning on the connection contact or the test connection contact 27. At this time, the separation mechanism 25 is driven to operate the opening and closing mechanism 23 to block the input lines N1 and P1.

In addition, the test connection contact 21 is connected to the relay 71 of the relay unit 70 through the relay connection lines 28 RY1 and RY2. That is, the output of the relay connection line 28 or the relay 70 is connected in parallel to the test switch 26. Therefore, when the relay 71 is connected by the relay unit 70, the test connection contact 27 is turned on, and the same effect as that of the test switch 26 is pressed is generated. That is, the power interrupter 20 such as an earth leakage breaker blocks the input power or the input line.

In addition, the present invention exemplifies an earth leakage breaker with a test signal, but is not limited thereto. Any circuit breaker that blocks both lines operated by the operation of the test button may be utilized and applied. In addition, the operation of these circuit breakers is conventionally used in the art, commercially available earth leakage breakers, earth leakage overload circuit breakers and the like and thus will not be described in detail.

Next, as shown in FIG. 6, the power output unit 30 supplies the output lines N2 and P2 and the ground line G2 to the load 200.

Next, the noise filter part 40 is comprised with the circuit which removes a noise from an input power supply. As shown in FIG. 7, the noise filter unit 40 includes an inductor and a capacitor to remove noise of an input power source.

Next, the power line detecting unit 50 configures each line detecting unit 50a or 50b according to each input line N1 or P1. This will be referred to as a first line detector 50a and a second line detector 50b, respectively. The first line detector 50a detects a voltage between one line N1 of the input lines N1 and P1 and the ground line G1, and the second line detector 50b detects the other line P1. ) And the voltage between ground line G1. That is, the first and second line detectors 50a and 50b detect the ground continuity by the potential difference between the input lines N1 and P1 and the ground line G1.

The first line detector 50a connects the rectifying unit 51a and the insulator 52a such as a photocoupler in series between the input line N1 and the ground line G1, and connects the insulator 52a of the photocoupler. The output (light receiver output) is output as a detection signal In-A. The rectifier 51a is composed of a diode D1 to pass only the reverse phase current of the AC power supply. The current passed by the rectifying unit 51a emits the light emitting unit of the insulating unit 52a, receives the light from the light receiving unit, and outputs the detection signal In-A to On. Therefore, the first line detector 50a outputs the detection signal In-A to ON only when the reverse phase power is input to the input line N1. The sensing signal at this time is called a first sensing signal. In particular, since the current flows between the input line N1 and the ground line G1 only when the ground line G1 is in the ground continuity state (grounded state), the first line detection unit 50a is used only in the ground continuous phase state. The first detection signal In-A is output. That is, in the case of the ground discontinuous state (not grounded state), since no current flows between the input line N1 and the ground line G1, the first sensing signal In-A is output as off.

In addition, the second line detector 50b connects the rectifier 51b and the insulator 52b such as a photocoupler in series between the input line P1 and the ground line G1, and outputs the insulator 52b. Outputs the (light-receiving part output) as a detection signal (In-B). The rectifier 51b is composed of a diode D4 to pass only the normal current of the AC power supply. The current passed by the rectifying unit 51b emits the light emitting unit of the insulating unit 52b, receives the light from the light receiving unit, and outputs the detection signal In-B to On. Therefore, the second line detector 50b outputs the detection signal In-B to ON only when the normal power is input to the input line P1. In addition, since the current flows between the input line P1 and the ground line G1 only when the ground line G1 is in the ground continuity state (grounded state), the second line detection unit 50b is limited to the ground continuous phase state only. 2 Output the detection signal (In-B). That is, in the case of the ground discontinuous state (not grounded state), since no current flows between the input line P1 and the ground line G1, the second sensing signal In-B is output as off.

Since the input power is an AC power source, the first and second line detectors 50a and 50b for detecting the power between each of the two input lines N1 and P1 and the ground line G are normally normal. Or reverse phase) and outputs an on signal. This is illustrated in FIG. 9. FIG. 9 illustrates first and second sensing signals In-A and In-B output by the first and second line sensing units 50a and 50b with respect to an AC power input in a ground continuity state. . As shown in FIG. 2, when the input power source is an AC power source, the first and second line detectors 50a and 50b alternately output the on / off signals. That is, when the supplied power is in reverse phase, the first detection signal is output on and the second detection signal is output off. When the power supply is normal, on the contrary, the first sensed signal is output off and the second sensed signal is output On.

Next, as shown in Figure 10, the detection unit 60 receives the detection signals (In-A, In-B) from the power line detection unit 30, the ground continuity or ground discontinuity (non-grounded, ungrounded, Ungrounded) state is detected. In addition, the detector 60 outputs the control signal RY-OUT to the relay unit 70 according to whether the ground is continuous. In addition, preferably, the detector 60 outputs an on / off display signal to the display unit 80 depending on whether there is an ungrounded (non-grounded, non-grounded) state or ground continuity.

In addition, the detection unit 60 is a microcontroller unit (MCU), which is configured as one control chip. The MCU receives a sensing signal or the like as an input signal and outputs a control signal (RY-OUT) or the like as an output signal. In addition, the MCU receives the DC power generated by the DC power supply unit 90 as a power source.

In particular, the detection unit 60 receives a detection signal of on / off (or 1/0) from the power line detection unit 30 and determines whether the ground continuity is in accordance with the signal value of the detection signals. The logic operation of determining the ground continuity according to the detection signal in the detector 60 is as shown in FIG. 10.

As shown in FIG. 11, when two sensing signals In-A and In-B are one on (1) or the other off (0), it is determined as a ground continuity state. In particular, when the first detection signal In-A is 0 and the second detection signal In-B is 1, the input power is in a normal state. In the opposite case, that is, when the first detection signal In-A is 1 and the second detection signal In-B is 0, the input power is in a reversed phase. If both of the first and second sensing signals In-A and In-B are off (0), it is determined as a non-ground state, that is, a ground discontinuity state. In this case, since the ground line G is not grounded, all of the detection signals are not detected.

In addition, when the ground state of the input power is determined to be a ground discontinuity, the detection unit 60 outputs a control signal RY-OUT to the relay unit 70 so that the relay unit 70 operates the power cut-off unit 20. Let's do it. That is, the control signal RY-OUT output to the relay unit 70 is output as off (0).

Next, as shown in FIG. 10, the display unit 80 displays a ground state or a delay state according to the output of the detector 60. That is, the detector 60 outputs a display signal to the display unit 80 according to the ground state of the input power. The display unit 80 displays the state of the power line (or input line) and the ground continuity state (or ungrounded state) to the outside through the indicator LED.

Next, the relay unit 70 is composed of a relay 71 for turning on / off input power and a driver 72 for driving the relay 71.

The driver 72 outputs a drive signal for controlling the relay 71 according to the control signal RY-OUT of the detector 60. The transistor Q3 is operated by the control signal RY-OUT of the detector 60 to drive the driver 72.

The relay 71 has its output both ends RY1 and RY2 connected to the test connection contact 21 of the power interrupter 20. In addition, the relay 71 is turned on by the driving of the driving unit 72, and as a result, the test connection contact 21 is connected. Therefore, the test switch 26 of the power cutoff unit 20 is turned on.

That is, the detection unit 60 drives the relay unit 70 when the power line is in a groundless (ground discontinuity) state before the electric power is turned on, thereby turning on the test switch 26 of the power cut-off unit 20 ( on), and eventually, the power cutoff unit 20 controls to cut off power. If the power line is in the normal state, the control returns to the previous state.

Next, the DC power supply unit 90 receives AC power from the power input unit 10 and converts the DC power into DC voltages (preferably 5V and 12V) to supply power to electronic circuits such as semiconductor devices. The DC power supply unit 90 includes a transformer for converting AC power into a DC voltage, and a rectifier for rectifying by removing noise from the output voltage of the transformer.

That is, the DC power supply unit 90 supplies the rectified DC power to the relay unit 70 or the detection unit 60 as a power source.

The present invention can be integrated and miniaturized by incorporating the power disconnect function of the ground disconnection into the function of the power circuit breaker such as an existing circuit breaker. Accordingly, the present invention can contribute to the fundamental prevention of an electric shock disaster due to a short circuit from all electric bills including a mobile electric machine / mechanical. In addition, the present invention can always check the ground continuity from the electrical equipment, such as a mobile electric machine / mechanism, it is possible to detect in advance the risk of electric shock that may occur from the separation / disconnection of the ground wire even during operation. In addition, by interrupting the input power supply of the electric device when the ground is discontinuous, it is possible to reduce the electric shock disaster by early detection and precaution of the earth leakage.

In addition, the present invention is configured so that the relay does not directly cut off the load power. Instead, the present invention connects a relay in parallel with an operation test switch of circuit breakers that cut off a power circuit, such as an earth leakage breaker and an overload earth leakage breaker. Through this, when a ground break occurs, it is configured to interlock with the operation of the power breaker. In particular, when a ground wire break occurs, the earth leakage breaker is operated because the relay of the ground break detection device is short-circuited at both ends of the electronically operated test switch of the power breaker.

Therefore, the load interruption device by the ground break detection according to the present invention, even if the relay is used as a small low-voltage relay, without causing any problems, it is possible to achieve a compact and light weight of the device. In addition, by blocking both lines due to the characteristics of the earth leakage breaker, it is possible to cut off all the voltage and current supplied to the load, and eliminate the risk of electric shock.

Next, a schematic configuration of a power circuit breaker operation-based load blocking device by detecting ground breaks according to a second embodiment of the present invention will be described.

The second embodiment of the present invention has the same configuration as that of the first embodiment described above, but has some differences in the configuration of the detection unit 60. In the following, only parts different from the first embodiment will be described. Portions of the second embodiment not described refer to the description of the first embodiment described above.

The detector 60 according to the second embodiment of the present invention includes a timer or a timer circuit (not shown) therein. When detecting the ground disconnection or the ground discontinuity state, the detector 60 measures the ground disconnection or the ground discontinuity state again after a preset delay time through a timer. In this way, the ground discontinuous state is repeatedly detected at a delay time interval. Preferably, the delay time is set between 1 and 99 seconds.

The detection unit 60 outputs the control signal RY-OUT to the relay unit 70 when the ground discontinuous state is repeatedly detected at least two times. That is, preferably, when detecting a predetermined minimum number of repetitions or more, the control signal RY-OUT is output to the relay unit 70.

In detail, if it is determined that the disconnection unit 60 is disconnected according to the detection signals In-A and In-B input from the power line detection unit 50, the detection unit 60 does not immediately transmit a relay operation signal to the relay unit 70. Instead, the continuity of the ground can be confirmed by transmitting the signal after a delay within a delay time range such as 1 to 99 seconds by the detection unit 60. In addition, it is possible to minimize the operation that is recognized as an uninterrupted ground break caused by disturbance such as chattering generated during power connection. By doing so, it is possible to improve reliability in identifying the ground disconnection and contribute to the prevention of electric shock accidents.

In addition, in the present invention, the delay circuit can be programmed and mounted in the firmware of the IC. As an example, it can be implemented utilizing the inherent functions of a programmable Atmel ATMEGAB (TQOP) microprocessor, a microprocessor commercially available in the art. Alternatively, microprocessors equivalent to the above can be used.

Next, a schematic configuration of a load circuit breaker based on a power circuit breaker by ground break detection according to a third embodiment of the present invention will be described with reference to FIG. 14.

The third embodiment of the present invention has the same configuration as that of the first or second embodiment described above, but has some differences in the configurations of the ground lines G1 and G2. In the following, only parts different from the first embodiment or the second embodiment will be described. Portions of the third embodiment not described refer to the description of the first embodiment or the second embodiment described above.

As shown in FIG. 14, a ground break test switch 310 is provided at the ground line G of the power input unit 10. One contact of the ground break switch test 310 is connected to the ground line G of the power input unit 10, and the other contact is grounded to the ground.

That is, the ground switch test 310 is for determining whether the ground line is disconnected or not. A button that is in an off state when the load interrupting device is in operation to determine whether the G line is normally grounded among the power lines represented by the P lines, the N lines, and the G lines (ground line), which are the power lines as shown in the first or second embodiment. Open the switch and ground it to earth.

That is, when the ground break test switch is opened (off), the ground state is recognized as disconnected and the load breaker detects the ground as disconnected and operates.

15 shows two types of grounding. Fig. 15A shows the collective connection to the chassis or substrate. That is, it means connected to the power line N line, which is referred to as "substrate ground". Figure 15 (b) means that the ground connected to the ground, hereinafter referred to as "earth ground".

The third embodiment as described above is to check whether the ground of the G line (ground line) in the commercial power line connected to the power supply terminal, that is, the power input unit 10 is not normal. That is, the ground break test switch 310 is a test button for determining whether or not the normal operation thereof.

However, in the third embodiment, the ground state of the load connected to the rear end of the earth leakage breaker cannot be detected. Hereinafter, the fourth embodiment is an embodiment for solving this.

Next, a schematic configuration of a load circuit breaker based on a power circuit breaker by ground break detection according to a fourth embodiment of the present invention will be described with reference to FIG. 16.

The fourth embodiment of the present invention has the same configuration as that of the third embodiment described above, except that the configurations of the ground lines G1 and G2 are different. In the following, only parts different from the third embodiment will be described. Portions of the fourth embodiment not described refer to the description of the third embodiment described above.

As shown in FIG. 16, the ground line G1 of the power input unit 10 is connected to the ground line G2 of the power output unit 30. In addition, the ground line G2 of the power output unit 30 is grounded to the substrate of the load 200.

In addition, the ground break test switch 320 is provided with an on / off switch, one contact of the switch is grounded to the ground, the other contact is connected to the substrate ground of the load 200.

Therefore, in the fourth embodiment of the present invention, it is configured to detect whether the ground is disconnected in the state closest to the actual use of the load such as various electric machinery, and to cut off all power. In addition, in order to determine whether or not the normal operation thereof, and connected to the ground portion (G5, the substrate ground portion) of the enclosure of the electric machine mechanism (or load) such as an electric motor, a heater and the ground line (G1 or G2) of the power supply side, The grounding part (G6, the board grounding part) of the electrical machine enclosure and the grounding wire test switch 320 are electrically connected. That is, the ground line G1 or G2 is grounded to the ground via the ground parts G5 and G6 and the ground disconnection test switch 320 of the electrical machine enclosure.

Through this connection, both the ground state of the power stage and the ground state of the load stage are sensed. That is, the circuit breaker operates when the ground of the load terminal is disconnected, and when the ground state of the power terminal of the load terminal is detected as the ground disconnect state according to the operation of the test switch, the power is cut off. In addition, when the disconnection state thereof is detected, it is possible to check (test) whether the overall present invention operates normally.

As mentioned above, although the invention made by this inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example and can be variously changed in the range which does not deviate from the summary.

10: power input unit 20: power cut off
30: power output unit 40: noise filter unit
50: power line detection unit 60: control unit
70 relay unit 80 display unit
90: DC power generator

Claims (6)

In the load breaker operation based on the power circuit breaker by detecting the ground break,
A power input unit for receiving commercial power;
A power output unit for outputting the input commercial power to the load;
A power cut-off unit provided between the power input unit and the power output unit to cut off power supplied to a load;
A power line detecting unit sensing a voltage of an input line of the power and outputting a detection signal;
A detector for detecting a ground continuity or ground discontinuity state by receiving a detection signal; And,
A relay unit configured to operate the power interrupting unit according to the control of the detection unit,
When the detection unit detects the ground discontinuity state, it detects the ground discontinuity state by repeating at a predetermined delay time interval, and outputs a control signal to the relay unit when it detects more than a predetermined minimum repetition number,
A ground disconnection test switch on a ground line of the power input unit;
And a contact of the ground break test switch is connected to a ground line of the power input unit, and the other contact is configured to contact the ground.
The method of claim 1,
The relay unit is connected in parallel to the contact of the test switch of the power breaker, the power circuit breaker operation-based load blocking device, characterized in that for connecting or disconnecting the contact of the test switch.
delete The method of claim 1,
And the minimum number of repetitions is 2 or more.
delete The method of claim 1,
The ground line of the power input unit is connected to the ground line of the power output unit, the ground line of the power output unit is grounded to the substrate of the load,
The load interruption device further includes a ground break test switch, wherein the ground break test switch includes an on / off switch, one contact of the switch is grounded to the ground, and the other contact is connected to the substrate ground of the load. Load breaker based on power breaker operation by detecting ground break.

Images