Monitoring system of fault current limiter

Abstract

The invention provides a monitoring system of a fault current limiter. The system comprises a voltage limiter MOV, a reactor L, a capacitor C, a relay coil T0, a relay switch T1 and a temperature monitoring system, wherein the voltage limiter MOV and the relay switch T1 are connected in series and then connected to the two ends of the capacitor C in parallel; the parallel output end of the capacitor C is connected with one end of the reactor L and the other end of the reactor L is connected with the relay coil T0; the temperature monitoring system comprises a wireless temperature sensor, a wireless transmission unit, an intelligent temperature monitor and a background monitoring center; the wireless temperature sensor is connected with the voltage limiter MOV. The monitoring system of the fault current limiter achieves a triple protective function for the current limiter by simple structural system settings.

Description

Technical field [0001] The invention relates to the field of power control, and in particular to a monitoring system for a fault current limiter. Background technique [0002] With the continuous expansion of the transmission capacity of the power system, the short-circuit current level of the power grid is also increasing. Limiting the short-circuit current has become an important issue in the development of modern power grids. The series resonance fault current limiter can not only limit the short-circuit current to a lower level, but also has the advantages of high operational reliability, automatic switching without additional control, low price and good technical and economic performance. When the system fails, the short-circuit current will pass through the series capacitor, and the metal oxide voltage limiter MOV is connected in parallel at both ends of the capacitor. The function is to prevent the capacitor from overvoltage damage and limit the voltage across the capacito...

AI Technical Summary

Problems solved by technology

However, due to the huge short-circuit current absorbed by the metal oxide voltage limiter MOV, it will cause the self-heating temperature to rise.

The temperature and short-circuit current that the voltage limiter can withstand are limited. When the limit is exceeded, it will not only cause damage to the voltage limiter, but even cause electrical accidents.

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