Method and device for testing 500kV metal oxide arrester
A lightning arrester and zinc oxide technology, which is applied in the direction of measuring devices, testing dielectric strength, instruments, etc., can solve the problems of workers being easily injured by electric shock, hidden dangers of personal and equipment safety, and inaccurate test data, so as to avoid damage and high-altitude Risk of falling, ensuring health" put into operation, and the effect of ensuring the reliability of power supply
Inactive Publication Date: 2011-10-19
MAINTENANCE BRANCH STATE GRID LIAONING ELECTRIC POWER +1
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Problems solved by technology
[0005] In the past, when the test personnel conducted the 500kV zinc oxide arrester test, the high-voltage lead wire had to be removed, and 5 to 6 maintenance personnel were required to use bucket trucks and cranes to work at high altitudes. Due to the electrification of the adjacent interval or the upper busbar, the lead wire was charged with several thousand volts. Even with tens of thousands of volts of electrostatic voltage, operators are vulnerable to electric shock; when the upper section is grounded, a tester needs to hold an insulating rod to hang the self-prepared ground wire, which is difficult and takes a long time to operate. Lead wires also pose a certain safety hazard to people and equipment
In addition, due to the influence of electrostatic voltage after the high-voltage lead is removed, measurement errors, inaccurate test data, and easy misjudgment
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[0026] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0027] The present invention is a test method for testing 500kV zinc oxide arrester. During the test, the upper high-voltage lead wire is reserved, and the grounding switch on the line side is used as the test ground wire to eliminate static interference. The specific operation steps are as follows:
[0028] 1) see Picture 1-1 , Firstly, carry out the test in the previous section, connect the microammeter in series between the grounding switch and the ground on the line side of the arrester, and use a DC high voltage generator to apply a DC voltage to the contact between the upper section and the middle section of the zinc oxide arrester. When the value of the microammeter reaches At 1mA, the applied voltage can reach 200kv±5%. Since the zinc oxide valves of the middle section and the lower section are connected in series, the impedance is much g...
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The invention relates to a method and a device for testing a 500kV metal oxide arrester. The method and the device are characterized in that: in a testing process, an upper-segment high tension lead is reserved, a line side grounding knifeswitch is switched on as a testing ground wire, and the upper-segment top of a metal oxide valve plate is grounded to eliminate electrostatic interference; each valve plate forms a testing loop with a DC high voltage generator and the ground respectively; a microampere meter is connected in series to the ground wire; and in the testing of a middle-segment valve plate, another microampere meter and a low tension arrester group are connected in series between a lower-segment valve plate and the ground. Compared with the prior art, the invention has the advantages of: 1) not requiring aerial work for connecting and disconnecting the high tension lead; 2) simplifying operations by utilizing the grounding knifeswitch as the testing ground wire; and 3) eliminating the influence of high voltage static electricity on test data and ensuring the accuracy of the test data.
Description
technical field [0001] The invention relates to the field of 500kV substations in electric power systems, in particular to a test method and device for testing 500kV zinc oxide arresters. Background technique [0002] Zinc oxide surge arrester (referred to as MOA) is the main equipment to protect the safe and stable operation of the power system. MOA is equivalent to a nonlinear resistor connected in series with 2 to 3 nodes. It uses the good nonlinear volt-ampere characteristics of zinc oxide to discharge and break The effect of the arrester is that the current flowing through the arrester is very small (microampere or milliampere level) at the normal working voltage; when the overvoltage is applied, the resistance drops sharply, and the energy of the overvoltage is released to achieve the effect of protection. [0003] The high-voltage leads on the top of the 500kV MOA are about 12 meters away from the ground. There is a grounding knife switch on the line side (the groundi...
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IPC IPC(8): G01R31/00G01R31/12
Inventor 张晓娜丁恩强伏忠旺李越鹏王钢刘淼齐志铭杨越孟也暄姜修平
Owner MAINTENANCE BRANCH STATE GRID LIAONING ELECTRIC POWER