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Zinc oxide lightning arrester live tester and testing method

A lightning arrester and zinc oxide technology, applied in the direction of testing dielectric strength, instruments, measuring electricity, etc., can solve problems such as unsafety, protection malfunction, unrealistic, etc., and achieve the effect of reducing the risk of accidents and ensuring reliability

Inactive Publication Date: 2015-09-16
YANGZHOU SHUANGBAO ELECTRIC EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to the provisions of the power industry standard, the main test method is to measure the AC leakage current under the operating voltage; the quality of the arrester is reflected in the size of its resistive current. Voltage reference signal; in the past, the conventional measurement method of zinc oxide surge arrester live test is to use the voltage signal of the secondary side of the PT as the reference signal, which brings a lot of unnecessary troubles, such as opening the PT terminal box for each test. Wiring test, and this is very unsafe, which may cause protection malfunction and cause adverse consequences; the PT secondary side of the railway traction transformer substation is about 20KM away from the zinc oxide arrester, and it is unrealistic to directly install the PT secondary

Method used

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  • Zinc oxide lightning arrester live tester and testing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 1 As shown, a live tester for zinc oxide arrester includes a split current sensor 1, a non-contact voltage sensor 2, an A / D converter 3, a processor 4, a storage module 5 and a display module 6, and the split current Both the sensor 1 and the non-contact voltage sensor 2 are connected to the A / D converter 3 through a line, and the A / D converter 3, the storage module 5 and the display module 6 are all connected to the processor 4;

[0040] The switchable current sensor 1 is used to collect the current of the arrester to generate a current signal;

[0041] The non-contact voltage sensor 2 is used to collect the reference voltage of the catenary, which is generated as a reference voltage signal;

[0042] The A / D converter 3 is used for digital-to-analog conversion of the current signal and the reference voltage signal; the AD converter adopts the high-precision 16-bit analog-to-digital synchronous converter AD73360 of the American TI company, and the conver...

Embodiment 2

[0063] Initialize the ARM processor IO port, stack pointer, RAM data, RTC module, USB module, AD conversion module, RA8875 driver module, interrupt settings, GUI graphics system initialization and other electronic components of the entire system; then enter the loop mode, allowing the display to touch Interrupt, AD sampling DMA interrupt, USB control interrupt, RTC real-time clock interrupt, these interrupts will update the data, after the interrupt is over, the main loop will have the flag of the interrupt setting, and continue to execute the interrupt. Non-emergency processing data: screen touch interrupt detection has action , the interactive touch soft interrupt will be triggered in the large cycle; when the AD data is updated, the Fourier transform FFT operation will be performed to obtain the angle between the test voltage and the current, and then obtain the current component according to the trigonometric function. Judging the operation of the zinc oxide arrester accord...

Embodiment 3

[0065] Such as figure 1 , Figure 4 and Figure 5 As shown, the two ends of the counter of the catenary arrester are connected in parallel to the two ends of the detector. Because the internal resistance of the detector is relatively large, the full current of the MOA of the zinc oxide arrester can be obtained without counting the shunt.

[0066] When the catenary is in normal operation, the 27.5KV high voltage applied by the zinc oxide arrester adopts the principle of high voltage induction, and a sensor is placed between the catenary and the ground to sense the corresponding voltage vector U and correct it to the actual high voltage ( 27.5KV) voltage vector Ux, with Ux as the reference vector, by calculating the phase difference Φ between the full current Ix and Ux during the operation of the zinc oxide arrester, using the trigonometric functions COSΦ and SINΦ to divide the resistive component IR and the capacitive component Ic in Ix Separated, so as to judge the operating...

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Abstract

The invention relates to a zinc oxide lightning arrester live tester and a testing method. The zinc oxide lightning arrester live tester comprises an open-close type current sensor, a non-contact type voltage sensor, an A / D converter, a processor, a storage module and a display module. The open-close current sensor and the non-contact type voltage sensor are connected to the A / D converter through the circuits; the A / D converter, the storage module and the display module are connected to the processor; and the display module displays testing data. Compared with the prior art, the zinc oxide lightning arrester live tester disclosed by the invention can accurately, practically and directly tests the insulation state of the lightning arrester, can perform the transverse comparison and the longitudinal comparison on the lightning arrester manufacturer and the historic testing data, and can help the power supply operation personnel to conveniently and accurately determine the insulation condition of the lightning arrester.

Description

technical field [0001] The invention relates to the technical field of lightning arrester live testing, in particular to a zinc oxide lightning arrester live tester and a test method applied to railway electrified catenary. Background technique [0002] Railway electrification catenary zinc oxide arrester is one of the important protection devices to ensure the safe operation of the railway locomotive power supply system. It is mainly used to limit the lightning overvoltage transmitted from the catenary or the internal overvoltage caused by operation. The zinc oxide arrester is composed of zinc oxide resistors connected in series. The resistors withstand the operating voltage for a long time, and the leakage current flows continuously. The zinc oxide arrester will continue to deteriorate under the operating voltage and overvoltage, and due to the long-term operation of the zinc oxide arrester. It may be affected by moisture, which is manifested as an increase in leakage curr...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R31/02
Inventor 何文春高荣庆邓昊
Owner YANGZHOU SHUANGBAO ELECTRIC EQUIP
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