Multi-section zinc oxide lightning arrester leakage current measurement apparatus

Abstract

The invention discloses a multi-section zinc oxide lightning arrester leakage current measurement apparatus. The apparatus comprises a remote control platform, a direct-current high-voltage generator, a direct-current microamp detection apparatus and multi-section zinc oxide lightning arresters. The remote control platform and the direct-current high-voltage generator are communicated in a wireless mode. A flange among the multi-section zinc oxide lightning arresters is fixedly connected to a wiring clamp. A physical position of the direct-current microamp detection apparatus is fixedly connected to the wiring clamp. A signal output terminal of the direct-current high-voltage generator is electrically connected to a signal input terminal of the direct-current microamp detection apparatus through a lead. The direct-current microamp detection apparatus is connected to the zinc oxide lightning arresters through the wiring clamp. By using the multi-section zinc oxide lightning arrester leakage current measurement apparatus of the invention, the direct-current microamp detection apparatus is physically fixed to the wiring clamp between the two sections of lightning arresters; a stray current of a high voltage test lead to surrounding air or equipment does not directly pass through the direct-current microamp detection apparatus so that an influence of the stray current is avoided and measurement accuracy is ensured.

Description

technical field [0001] The invention relates to a current measuring device, in particular to a leakage current measuring device of a multi-section zinc oxide arrester. Background technique [0002] Zinc oxide arrester is one of the electrical components of the substation. It is composed of non-linear zinc oxide valves and is used to prevent external lightning strikes or internal overvoltage shocks from damaging electrical equipment. In the handover or routine test, it is necessary to test the DC reference voltage of the zinc oxide arrester at the DC reference current and the leakage current measurement (microampere level) at 0.75 times the DC reference voltage. The current existing device measures the leakage current by installing a microammeter on the top of the DC high voltage generator for measurement, and the console is connected with the DC high voltage generator through a cable. The existing measurement method has the following problems: 1. The microammeter is install...

AI Technical Summary

Problems solved by technology

The existing measurement method has the following problems: 1. The microammeter is installed on the DC high-voltage generator, and the leakage current of the test will include the stray current of the high-voltage test lead to the surrounding air or equipment, and the measurement error is large; 2. The operating table There is a physical connection with the DC high voltage generator, once a fault occurs, the high voltage may be transmitted to the operating table through the cable, endangering the life safety of the operator

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