Zinc oxide lightning arrester live-line testing apparatus

Abstract

The invention relates to a zinc oxide lightning arrester live-line testing apparatus. The apparatus comprises a single-chip microcomputer control system, an AD converter, a sensor, a simulation switch, a program control amplification part, a power supply management part, a memory, a display, a printer, a USB control part and the like. The core board of the single-chip microcomputer control system is an STM32F103 manufactured by the STMicroelectronics and is used as a processor; the AD converter is an AD7656, a high-precision 16-bit analog-to-digital converter manufactured by the American ADI company; and the sensor is a high-precision zero-magnetic flux sensor KT0.02-PJ. The apparatus can effectively separate resistive current, capacitive current and power consumption, can accurately, practically and visually demonstrate the equipment insulation states and can assist operation personnel in conveniently and accurately determining the insulation states, thereby effectively ensuring reliability of the safe operation of an electric power system.

Description

technical field [0001] The invention belongs to the technical field of live test and fault diagnosis of high-voltage equipment in substations, and in particular relates to a live test device for a zinc oxide arrester. Background technique [0002] Zinc oxide arrester is one of the important protection devices to ensure the safe operation of the power system. It is mainly used to limit the lightning overvoltage transmitted from the power line 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 by an increase in leakage current. If this fault condition is not controlled, the zinc oxide ...

AI Technical Summary

Problems solved by technology

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 a reference signal, which brings a lot of unnecessary troubles, such as opening the PT terminal box for each test, and performing a wiring test, and This is very unsafe and may cause protection malfunctions and cause adverse consequences

In addition, due to the connection between different substations, the main transformer and the station transformer, the existing technology will inevitably lead to problems such as low measurement accuracy of parameters such as separation resistive current, and poor repeatability of measurement results. It is difficult for auxiliary operators to judge conveniently and accurately. its insulation condition

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