System for measuring transient shell voltage of gas insulated switchgear

Abstract

In order to reduce disadvantageous influence caused by electromagnetic interference, improve the accuracy of measurement and provide a shielding device for measuring the transient shell voltage of a gas insulated switchgear (GIS) when the GIS is measured, the invention provides a system for measuring the transient shell voltage of the GIS. The system is characterized by comprising a measuring cable, a voltage measuring device and a measured data processing system, wherein the measuring cable is connected between a shell of the GIS and the voltage measuring device; the voltage measuring device is used for measuring the voltage of the shell of the GIS; the measured data processing system is used for processing the measured data from the voltage measuring device; and the measuring system comprises the shielding device which is used for wholly shielding the measuring cable, the voltage measuring device and the measured data processing system. Through the technical scheme, the shielding device for measuring the transient shell voltage of the GIS is provided; the influence of the electromagnetic interference is reduced; and the accuracy of measurement is improved.

Description

technical field [0001] The invention relates to a measurement system for the transient enclosure voltage (TEV) of a gas-insulated switchgear (GIS) in an extra-high voltage AC power transmission and transformation system, in particular to electromagnetic interference shielding for the transient enclosure voltage measurement system for a gas-insulated switchgear. Background technique [0002] Gas insulated switchgear in UHV AC power transmission and transformation system has significant advantages such as small footprint, good sealing, little impact on the environment, high operational reliability, long maintenance cycle, less maintenance workload, and low operating cost. The power grid has been widely used and has been successfully applied to UHV test demonstration projects. When the isolation switch, grounding switch and circuit breaker in the GIS operate, they generate traveling waves with a very steep wave head. After these traveling waves undergo multiple refraction and r...

AI Technical Summary

Problems solved by technology

[0004] However, due to the high voltage level of the UHV AC power transmission system and the complex structure of GIS equipment, electromagnetic interference will cause great interference to the resistive impedance voltage division measurement device that does not consider electromagnetic shielding measures. The measurement results obtained when the interference is serious It will deviate far from the actual true value, resulting in unreliable measurement results, so it is necessary to take electromagnetic shielding measures for the resistive impedance partial voltage measurement device

[0005] Generally, the use of electric field probes is suitable for the case of simple GIS equipment structure. When the structure of GIS equipment is complex, especially with branch buses, the electric field value measured by the electric field probe is difficult to obtain the transient shell voltage through electric field inversion.

At present, there is no systematic introduction to the shielding of the measurement system for measuring the transient shell voltage of GIS equipment based on resistive impedance voltage division at home and abroad.

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