CN203930036U - A kind of three-phase overvoltage protector revise instrument - Google Patents

Abstract

The utility model discloses a calibrator for a three-phase overvoltage protection device, which comprises a casing, a power supply and a high-voltage generator arranged in the casing, and a sampling device, a comparison device and a display device sequentially connected through signal lines are arranged in the casing. The device, the high-voltage generator, the sampling device, the comparison device and the display device are respectively connected to the power supply, and a function panel is arranged on the surface of the shell, and the function panel includes a power interface, a switch, a generating button, a display panel, an input port and an output port. The utility model can not only verify the accuracy of the lightning counter and the current detection device in the overvoltage protection device, but also verify the action of the arrester, and perform three-phase measurement at the same time, which saves the verification time, is convenient to operate, intuitive to display, and can Quickly meet the test requirements and improve the work efficiency of equipment inspectors.

Description

A three-phase overvoltage protection device calibrator

technical field

The utility model belongs to the technical field of overvoltage protection calibration devices, in particular to a three-phase overvoltage protection calibration device.

Background technique

In 10KV to 35KV substations, the devices used for overvoltage protection are mostly lightning arresters and their supporting measuring instruments. Among them, the lightning arresters are mostly zinc oxide, and the measuring instruments include lightning counters and current detection devices. The arrester plays the role of breakdown protection during overvoltage or overcurrent. The lightning counter and current detection device reflect the number of actions of the arrester and the value of the total current during the operation of the arrester, and comprehensively reflect the protection and insulation status of the arrester. Therefore, before putting into use Or periodically, it is necessary to check the overvoltage protection device, including testing the three-phase arrester, and checking the lightning counter and ammeter. However, the current inspection method is relatively simple, and requires the cooperation of various inspection instruments, especially for single-phase inspection each time, and only three-phase arrester needs three measurements, which is a waste of test time and is not conducive to the three tests. Compared with the data, the detection takes a long time, which is not conducive to the timely power transmission of the equipment.

Utility model content

The utility model aims at the deficiencies in the prior art, and provides a three-phase overvoltage protection device calibrator, which can not only verify the accuracy of the lightning counter and current detection device, but also verify the action of the arrester. Phase measurement saves calibration time and improves calibration efficiency.

In order to solve the above technical problems, the technical solution of the utility model is: a three-phase overvoltage protection device calibrator, including a housing, a power supply and a high-voltage generator arranged in the housing, and the housing is also provided with signal lines that pass through in turn connected sampling device, comparison device and display device, the high-voltage generator, sampling device, comparison device and display device are respectively connected to the power supply.

A functional panel is provided on the surface of the housing, and the functional panel includes a power interface, a switch, a button, a display panel, an input port and an output port, the power interface and the switch are respectively connected to the power supply, and the button is connected to the The high voltage generator is connected, the input port is connected to the output port of the high voltage generator, and the output port is connected to the input port of the sampling device.

The input port and the output port are respectively set into 3 groups.

The sampling device is a high-precision differential current transformer.

The comparison device adopts a single-chip microcomputer.

The display panel device is a liquid crystal matrix type with 128×64 dot matrix.

When the equipment is in use, first connect the device to be tested, that is, the overvoltage protection device, to the equipment, and the three-phase input terminals of the overvoltage protection device are respectively connected to the input port of the equipment, that is, the output terminal of the high voltage generator, and the overvoltage protection device The three-phase output terminals of the three phases are respectively connected to the corresponding output ports, that is, connected to the input terminals of the sampling device.

The power supply inside the casing is supplied by an external mains power supply, which can be divided into two parts, one part completes the direct transmission of the mains power and realizes the power supply for the high-voltage generator, and the other part is a switch-type PC power supply, and the input terminal of the power supply is still the mains power supply. However, the mains voltage can be converted into a DC voltage source output as required, so as to meet the supply requirements of different modules in the device.

After the switch is turned on, the power of each module is turned on, and the high-voltage generator is activated through the button on the function panel to perform an overvoltage simulation test: after the electrical signal of the high-voltage generator passes through the device under test, the test electrical signal is obtained, and the current sampling The device collects the current signal in the test electrical signal, and sends the current signal to the comparison device to complete the comparison between the test current signal and the standard current signal, so as to judge whether there is a fault. If there is a fault, the comparison device outputs an alarm signal, and the display device receives it. Comparing the test current signal, the number of actions of the generator and the alarm signal sent by the device, that is, the value of the test current, the number of actions and the alarm indication are displayed on the display panel. Since the test is carried out at the same time for the three phases, the indications of the display panel are also divided into three channels. The operator can compare the indications of the lightning counter and ammeter in the overvoltage protection device under test according to the data and alarm indications on the display panel. Compare and quickly judge whether there is a fault and which phase has a fault.

The calibrator of the three-phase overvoltage protection device of the utility model can measure the three-phase overvoltage protection device at the same time, without detecting that one phase is connected to another phase, which saves connection time and test time, and facilitates the comparison of the three test data , the detection takes a short time, which is convenient for the timely power transmission of the equipment. At the same time, the number of actions of the three-phase overvoltage protection device can also be verified to measure whether it can act when the lightning current passes through, and the number of actions can be checked. The operation is convenient and the display is intuitive, which can quickly meet the test requirements and improve the work of equipment inspection personnel. efficiency.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is described further:

Fig. 1 is a functional panel diagram of the present utility model.

Fig. 2 is a measurement schematic diagram of the utility model.

Detailed ways

Example

As shown in Figure 1 and Figure 2, a three-phase overvoltage protection device calibrator includes a housing 7, a power supply 6 and a high-voltage generator 2 arranged in the housing, and the housing is also provided with a power supply connected sequentially through signal lines. The sampling device 3 , the comparing device 4 and the display device 5 , the high voltage generator 2 , the sampling device 3 , the comparing device 4 and the display device 5 are respectively connected to a power source 6 .

A functional panel is arranged on the surface of the housing 7, and the functional panel includes a power interface 1, a switch 14, a button 10, a display panel 11, an input port 12, and an output port 13. Since the three phases are measured simultaneously, the input port and the output port are respectively Set up in 3 groups, the power interface 1 and the switch 14 are respectively connected to the power supply 6, the generation button 10 is connected to the high voltage generator 2, the input port 12 is connected to the output end of the high voltage generator 2, and the output port 13 is connected to the input end of the sampling device 3.

The sampling device is a high-precision differential current transformer, which can be set into three groups corresponding to the three phases, preferably TLI4970 current transformer, which uses the differential measurement principle to suppress the interference caused by the external magnetic field, so the measurement deviation is extremely low , only 25mA; at the same time, this current transformer adopts an independent structure for measuring temperature and mechanical stress, which can meet the requirements of long-term measurement stability and high precision.

Comparing device adopts single-chip microcomputer, preferably ATMEGA162 used in conjunction with TLI4970 type current transformer, can make full use of the comparison and receiving transmission function of this single-chip computer, the pulse output pin of three groups of current transformers is connected with three external interrupt pins of ATMEGA162 respectively When there is an external interrupt, ATMEGA162 reads the current effective value of each group of current transformers in sequence, and processes the read data, that is, compares it with the standard current value stored in the microcontroller, and stores the comparison result in In the single-chip comparison register, the comparison register is an inherent unsigned 24-bit register in the single-chip microcomputer, which stores the ratio of the current measurement value to the standard range. When the ratio shows a range error of more than 10% around 1, the single-chip microcomputer Output an alarm signal.

The display device is preferably a liquid crystal matrix type of 128 × 64 dot matrix. The display panel 11 is divided into two parts, a part is a three-phase test current display panel 8, and a part is a number of actions and an alarm indication display panel 9, preferably LCD12864. In addition, In order to facilitate data interaction with the upper computer, the display panel can also expand the 485 bus interface, preferably the MAX485 bus converter of MAXIM Company.

The power supply inside the housing is supplied by an external mains power supply, and the power supply interface is connected with an external 220V power line, which can be divided into two parts, one part completes the direct transmission of AC 220V voltage, realizing the power supply for the high-voltage generator, and the other part is a switch-type PC power supply, The input terminal of the power supply is still the mains, but the mains voltage can be converted to a DC voltage source output as required, such as ±12V, ±5V, ±3.3V, so as to meet the supply requirements of different modules in the device.

When the equipment is in use, first connect the device to be tested, that is, the overvoltage protection device, to the equipment, and the three-phase input terminals of the overvoltage protection device are respectively connected to the input port of the equipment, that is, the output terminal of the high voltage generator, and the overvoltage protection device The three-phase output terminals of the three phases are respectively connected to the corresponding output ports, that is, connected to the input terminals of the sampling device. After the switch is turned on, the power of each module is turned on, and the high-voltage generator is activated through the button on the function panel to perform an overvoltage simulation test: after the electrical signal of the high-voltage generator passes through the device under test, the test electrical signal is obtained, and the current sampling The device collects the current signal in the test electrical signal, and sends the current signal to the comparison device to complete the comparison between the test current signal and the standard current signal, so as to judge whether there is a fault. If there is a fault, the comparison device outputs an alarm signal, and the display device receives it. Comparing the test current signal, the number of actions of the generator and the alarm signal sent by the device, that is, the value of the test current, the number of actions and the alarm indication are displayed on the display panel. Since the test is carried out at the same time for the three phases, the indications of the display panel are also divided into three channels. The operator can compare the indications of the lightning counter and ammeter in the overvoltage protection device under test according to the data and alarm indications on the display panel. Compare and quickly judge whether there is a fault and which phase has a fault.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to the scope of the technical solution of the present invention.

Claims (6)

1. A three-phase overvoltage protection device calibrator, comprising a housing and a power supply and a high-voltage generator arranged in the housing, characterized in that: the housing is also provided with a sampling device, a comparison device and a comparison device connected sequentially by a signal line The display device, the high voltage generator, the sampling device, the comparison device and the display device are respectively connected to the power supply. 2. The three-phase overvoltage protection device calibrator as claimed in claim 1, wherein a functional panel is arranged on the surface of the housing, and the functional panel includes a power interface, a switch, a button, a display panel, and an input port and the output port, the power interface and the switch are respectively connected to the power supply, the generating button is connected to the high voltage generator, the input port is connected to the output end of the high voltage generator, and the output port is connected to the sampling device input. 3. The three-phase overvoltage protection device calibrator according to claim 2, characterized in that: the input ports and the output ports are respectively set in three groups. 4. The three-phase overvoltage protection device calibrator according to claim 1, wherein the sampling device is a high-precision differential current transformer. 5. The three-phase overvoltage protection device calibrator according to claim 1, characterized in that: the comparison device adopts a single-chip microcomputer. 6. The three-phase overvoltage protection device calibrator according to claim 2, characterized in that: the display panel device is a liquid crystal matrix type with 128×64 dot matrix.