Mixed-type high-temperature superconducting short trouble current limiter

Abstract

The invention discloses a short trouble current limiter which is composed of a rectifier bridge, a first protective resistor (Rv), a high-temperature superconducting coil (SL), a switching tube (K), a direct current reactor (Lb), a second protective resistor (Ra) and a protected diode (Da), wherein the rectifier bridge is composed of a first diode (D1), a second diode (D2), a third diode (D3) and a fourth diode (D4); a protective resistor (Rs), the switching tube (K) and the high-temperature superconducting coil (SL) are connected in parallel, and the parallel branch is connected between the first direct current end M and the third direct current end P of the rectifier bridge; the second protective resistor (Ra) and the serial branch of the protected diode (Da) are connected with the direct current reactor (Lb) in parallel, and the parallel branch is connected between the second direct current end N and the third direct current end P of the rectifier bridge. The current limiter is connected with the direct current reactor and the high-temperature superconducting coil on the direct current end of the diode rectifier bridge to realize mutual current limiting.

Description

Technical field [0001] The invention relates to a fault current limiter for a transmission and distribution network, in particular to a short-circuit fault current limiter based on YBCO high temperature superconducting tape. Background technique: [0002] With the rapid development of the national economy, the society’s demand for electricity continues to increase, which has led to the continuous development of the power system. The capacity of single machines and power plants, the capacity of substations, and urban and industrial center loads continue to increase, which makes the power systems interconnected. , The level of short-circuit current in the power grids at all levels continues to increase, and short-circuit faults are becoming more and more destructive to the power system and its connected electrical equipment. Moreover, while the demand for electric energy is increasing, people have also put forward higher requirements for power quality, power supply reliability and ...

AI Technical Summary

Problems solved by technology

At the same time, the current flowing through the bias power supply is often 2 to 3 times the grid current, and must meet the requirements of the current change in the non-fault state and the fault state. Therefore, the realization of the bias power supply has certain technical difficulties and high requirements. cost

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