Capacitor bank main wiring structure and fault judgment method

Abstract

The invention provides a capacitor bank main wiring structure and a fault judgment method. According to the capacitor bank main wiring structure, a capacitor bank is divided into two strings of capacitor banks with the same series number, part or all equipotential points in the two strings of capacitor banks are connected through connecting wires, at least two parts are connected, and each connecting wire is connected to a current transformer. The calculation is simple, only the phase of bus current, the size of the current of each connecting wire and the phase, which takes the phase of the bus current as a reference, of the current of each connecting wire are required to be measured, and if a capacitor fault occurs, the location of the fault can be judged through the size and the phase of the current of each connecting wire.

Description

【Technical field】 [0001] The invention relates to a power capacitor, in particular to a capacitor bank main wiring structure and a fault judgment method. 【Background technique】 [0002] With more and more ultra-high voltage and ultra-high voltage direct current transmission projects, power capacitors are used as reactive power compensation and harmonic filtering. Large size, many strings, and many capacitors. [0003] Currently, if figure 1 As shown, the commonly used capacitor bank adopts the bridge differential protection method, including capacitors C1, C2, C3, C4 and current transformer TA. It can only detect capacitor failures and the sensitivity is not high, but the location of the fault point cannot be determined. Such as figure 2 As shown, some companies have proposed a double-bridge differential unbalance protection method, including multiple capacitors C and two current transformers TA. This protection method improves the protection sensitivity, but it is diffi...

AI Technical Summary

Problems solved by technology

[0003] Currently, if figure 1 As shown, the commonly used capacitor bank adopts the bridge differential protection method, including capacitors C1, C2, C3, C4 and current transformer TA. It can only detect capacitor failures and the sensitivity is not high, but the location of the fault point cannot be determined.

Images