Comprehensive tester for secondary circuit of current transformer

Abstract

The present invention relates to a comprehensive tester for the secondary circuit of a current transformer, comprising: a box, a test wire, a battery box with a wireless relay module, a power supply, a polarity meter, an insulation resistance display screen, a DC resistance display screen, a function selection knob, a gear switching knob, a button and an output terminal installed in the box. When using this tester, you only need to carry one device, connect the test cable to the tester and the test terminal, select the option to be tested, and there is no need to repeatedly dismantle and modify the wiring. When the secondary polarity verification of the transformer is selected, the battery box with the wireless relay module is connected in series with the transformer to be tested, and the on and off is controlled by the phase conversion knob on the tester panel, and there is no need to repeatedly connect the wiring. This avoids the physical energy consumption caused by the test personnel moving the instrument back and forth and repeatedly dismantling the wiring, and avoids the noise interference when the polarity verification personnel call each other when there is noise, and at the same time reduces physical energy consumption.

Description

Technical Field

[0001] The invention belongs to the field of electrical testing, and in particular to a comprehensive tester and a test method for a secondary circuit of a current transformer. Background Art

[0002] During secondary circuit calibration, insulation, DC resistance, and polarity are verified using independent devices, each requiring individual instrument connections to the bay under test. Statistics show that when three commissioning personnel commission a single 10kV outgoing line bay, assuming the protection devices and circuit wiring are completely correct, the wiring work must be repeated at least 28 times, requiring five personnel to carry the instruments. Excessive bays significantly increases equipment outage time and the physical demands of the operators. Furthermore, experiments have shown that in noise-prone environments, the decibel level of the operator's voice during polarity verification increases, while the number of verifications that can be completed simultaneously decreases.

[0003] In the past, when testing secondary circuits, testers had to repeatedly move three pieces of testing equipment. The work steps were cumbersome and the workload was heavy, which greatly affected work efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a comprehensive tester for the secondary circuit of a current transformer.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A comprehensive secondary circuit tester for a current transformer comprises: a box, a test wire, and a battery box with a wireless relay module. A power supply, a polarity meter, an insulation resistance display screen, a DC resistance display screen, a function selection knob, a gear switching knob, a button, and an output terminal are installed in the box. The polarity meter is connected to the function selection knob, the function selection knob is connected to the gear switching knob, the gear switching knob is connected to the output terminal, the gear switching knob is connected to the button, the button is connected to the DC resistance display screen, the DC resistance display screen is connected to the power supply via the function selection knob, and one end of the insulation resistance display screen is connected to the power supply, and the other end is connected to the function selection knob and the gear switching knob.

[0007] Furthermore, the power supply is a 24V battery. When measuring the DC resistance or insulation resistance of the loop, it is placed in the box as a power source. When measuring the polarity of the secondary loop, it is removed and placed in a battery box with a wireless relay module to power the transformer to be measured.

[0008] Furthermore, there is a ground wire connection hole on the left side of the box.

[0009] Furthermore, the method for using the secondary circuit comprehensive tester of the current transformer is as follows: when using, connect the ground wire connection hole of the device to the ground copper busbar near the equipment, connect the test wire to the output terminal of the device and the terminal of the equipment to be tested, and turn on the power;

[0010] When measuring the DC resistance of a loop, turn the function selector knob to the DC resistance position. At this time, the DC resistance module inside the tester is turned on. Use the buttons to measure the resistance of loops AN, BN, and CN, and the readings are displayed on the DC resistance screen.

[0011] When measuring the insulation resistance of a circuit, turn the function selector knob to the insulation position. At this time, the insulation resistance module inside the tester is connected. Use the buttons to measure the insulation resistance of the circuit, and the reading is displayed on the insulation resistance display.

[0012] When verifying the polarity of the secondary circuit, turn the function selection knob to the polarity position. At this time, the tester is powered off and the internal polarity module is connected. Remove the battery in the box and put it into the battery box to power the transformer to be tested. Connect the wireless relay module to the test wire and the primary copper plate of the transformer to be tested. Use the gear switch knob to select the phase-to-phase on and off of the secondary terminal. Press the gear switch knob once at the same time. The wireless relay module is connected once and the result is displayed on the polarity table.

[0013] The advantages and positive effects of the present invention are:

[0014] When using this tester, you only need to carry one device, connect the test cable to the test terminal, and select the option to be tested. There is no need to repeatedly disassemble and modify the wiring. When selecting the secondary polarity verification of the transformer, connect the battery box with the wireless relay module in series with the transformer to be tested, and control the on and off with the phase conversion knob on the tester panel. There is no need for repeated wiring. This avoids the physical exertion caused by the tester moving the instrument back and forth and repeatedly disassembling and connecting the wires. It also avoids the noise interference caused by the polarity verification personnel calling each other when noisy operations are carried out, and at the same time reduces physical exertion. The tester power supply can also be removed and used as a polarity output current source, reducing battery consumption, low-carbon operation, and shortening equipment power outage time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the circuit block diagram of the secondary circuit comprehensive tester;

[0016] Figure 2 This is a physical picture of this secondary circuit comprehensive tester. DETAILED DESCRIPTION

[0017] The embodiments and features in the embodiments of this application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs.

[0018] A comprehensive secondary circuit tester for a current transformer includes a box, test wires, and a battery box with a wireless relay module 8. A power supply, a polarity meter 9, an insulation resistance display screen 6, a DC resistance display screen 5, a function selection knob 3, a gear shift knob 7, a button 4, and an output terminal 2 are installed in the box. A ground wire connection hole is provided on the left side of the box.

[0019] The polarity meter 9 is connected to the function selection knob 3, which is connected to the gear shift knob 7, which is connected to the output terminal 2. The gear shift knob 7 is connected to the button 4, which is connected to the DC resistance display 5. The DC resistance display 5 is connected to the power supply through the function selection knob 3. One end of the insulation resistance display 6 is connected to the power supply, and the other end is connected to the function selection knob 3 and the gear shift knob 7.

[0020] The power supply is a 24V battery. When measuring the DC resistance or insulation resistance of the circuit, it is placed in the box as a power source. When measuring the polarity of the secondary circuit, it is removed and placed in the battery box with the wireless relay module 8 to power the mutual inductor to be measured.

[0021] When in use, connect the ground wire to the ground wire connection hole of the device and the grounding copper busbar near the equipment, connect the test wire 1 to the output terminal 2 of this device and the terminal of the equipment to be tested, and turn on the power.

[0022] When measuring the DC resistance of a loop, turn the function selector knob 3 to the "DC resistance" position. The DC resistance module inside the tester is now connected. Press button 4 to measure the resistance of loops AN, BN, and CN. The reading is displayed on the DC resistance display 5.

[0023] When measuring the insulation resistance of a circuit, turn the function selector knob 3 to the "Insulation" position. The insulation resistance module inside the tester is now connected. Press button 4 to measure the insulation resistance of the circuit, and the reading is displayed on the insulation resistance display screen 6.

[0024] To verify the polarity of the secondary circuit, turn function selector 3 to the "Polarity" position. This will disconnect the tester from the power supply, connect the internal polarity module, remove the battery from the box, place it in the battery compartment, and power the transformer under test. Connect the wireless relay module to test wire 1 and the primary copper plate of the transformer under test. Use position selector 7 to select the interphase connection and disconnection of the secondary terminals. Simultaneously, press position selector 7 once, which will connect the wireless relay module 8. The result will be displayed on polarity meter 9.

[0025] The present invention has been tested in the laboratory and is found to be in full compliance with the requirements of the "National Grid Substation Operation Management Regulations" and the "National Grid Corporation Electric Power Safety Work Regulations (Substation Part)", and can be applied on site.

[0026] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A comprehensive tester for the secondary circuit of a current transformer, characterized in that: include: It includes a box body, test wires, and a battery box with a wireless relay module. A power supply, a polarity meter, an insulation resistance display screen, a DC resistance display screen, a function selection knob, a gear shift knob, a button, and an output terminal are installed in the box body. The polarity meter is connected to the function selection knob, the function selection knob is connected to the gear shift knob, the gear shift knob is connected to the output terminal, the gear shift knob is connected to the button, the button is connected to the DC resistance display screen, the DC resistance display screen is connected to the power supply through the function selection knob, one end of the insulation resistance display screen is connected to the power supply, and the other end is connected to the function selection knob and the gear shift knob.

2. The secondary circuit comprehensive tester of the current transformer according to claim 1, characterized in that: The power supply is a 24V battery. When measuring the DC resistance or insulation resistance of the loop, it is placed in the box as a power source. When measuring the polarity of the secondary circuit, it is removed and placed in a battery box with a wireless relay module to power the transformer to be measured.

3. The secondary circuit comprehensive tester of the current transformer according to claim 2, characterized in that: There is a ground wire connection hole on the left side of the box.

4. The method for using the secondary circuit comprehensive tester of the current transformer according to claim 1, characterized in that: When in use, connect the ground wire to the ground wire connection hole of the device and the grounding copper bar near the equipment, connect the test wire to the output terminal of this device and the terminal of the device to be tested, and turn on the power; When measuring the DC resistance of a loop, turn the function selector knob to the DC resistance position. At this time, the DC resistance module inside the tester is turned on. Use the buttons to measure the resistance of loops AN, BN, and CN, and the readings are displayed on the DC resistance screen. When measuring the insulation resistance of a circuit, turn the function selector knob to the insulation position. At this time, the insulation resistance module inside the tester is connected. Use the buttons to measure the insulation resistance of the circuit, and the reading is displayed on the insulation resistance display. When verifying the polarity of the secondary circuit, turn the function selection knob to the polarity position. At this time, the tester is powered off and the internal polarity module is connected. Remove the battery in the box and put it into the battery box to power the transformer to be tested. Connect the wireless relay module to the test wire and the primary copper plate of the transformer to be tested. Use the gear switch knob to select the phase-to-phase on and off of the secondary terminal. Press the gear switch knob once at the same time. The wireless relay module is connected once and the result is displayed on the polarity table.

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