Device and method for super-fast transient overvoltage simulation of metal oxide voltage limiter

Abstract

The invention provides a device and a method for super-fast transient overvoltage simulation of a metal oxide voltage limiter. The device uses a voltage limiter core resistor R(i) to simulate characteristics, verifying along with current, of an equivalent resistor of the voltage limiter core. The voltage limiter core resistor R(i) is connected with a voltage limiter core capacitor C1 in parallel to form a RC loop to simulate high-frequency response characteristics of the voltage limiter core. The voltage limiter core capacitor C1 depends on a high-frequency capacitor of a voltage limiter valve block and the voltage limiter core structure. A voltage limiter connecting inductor L is formed by high-frequency inductors, connected with conductors, inside the voltage limiter. The RC loop is connected with the inductor L in series to form a RLC loop and is connected with a ground capacitor C2 of the voltage limiter in parallel. Accordingly, the method for super-fast transient overvoltage simulation of the metal oxide voltage limiter is formed, voltage limiter characteristic simulation computing under super-fast transient overvoltage is achieved, and limit action of the voltage limiter on super-fast transient overvoltage and application range of the voltage limiter are analyzed.

Description

technical field [0001] The invention belongs to the field of power system overvoltage, and in particular relates to a very fast transient overvoltage simulation device and method for a metal oxide voltage limiter. Background technique [0002] Experimental studies have shown that the operation of gas-insulated metal-enclosed switchgear (GIS) disconnectors will generate a very fast transient overvoltage (hereinafter referred to as VFTO) with high amplitude and steepness. It has a significant impact on the operation of secondary equipment. At present, the method of GIS isolating switch with damping resistor proposed by Toshiba is widely used to suppress VFTO, and it has been well applied in practice. Both Changzhi Station and Nanyang Station of my country's UHV AC test demonstration project have adopted this scheme. Tsinghua University tried to install a high-frequency magnetic ring on the GIS high-voltage guide rod to suppress VFTO. A large number of laboratory studies have ...

AI Technical Summary

Problems solved by technology

These voltage limiter simulation models are suitable for a wide frequency range, and can be applied to the calculation of lightning and operational waves with a wave head time of 0.5 μs and above, but none of them have reached the calculation frequency of VFTO, and the model structure and calculation process are complicated. Difficulty, lack of practicability

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