YBCO high-temperature superconducting strip-based short circuit fault current limiter

Abstract

The invention discloses a YBCO high-temperature superconducting strip-based short circuit fault current limiter. The direct current end of a diode rectifier bridge of a current limiter is connected in parallel with a current limiting coil; and the current limiting coil is formed by winding a YBCO high-temperature superconducting strip. The current limiting coil has the characteristic of a direct current reactor. When a power grid is in a steady state, the current limiter has no influence on the power grid. Once a short circuit fault happens, when a fault current passes through the current limiting coil, the YBCO high-temperature superconducting strip quenches to generate resistance to realize fault current limiting. The superconducting current limiter of the invention can realize automatic fault triggering and automatic current limiting, and can automatically generate current limiting impedance with different intensities according to the intensities of the fault current. The current limiter has strong current limiting capability and little influence on the steady state of the power grid.

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 drives the continuous development of the power system. The capacity of single machines and power plants, the capacity of substations, and the load of cities and industrial centers continue to increase, which makes the interconnection of power systems , the level of short-circuit current in the power grid at all levels is increasing continuously, and the destructiveness of short-circuit faults to the power system and its connected electrical equipment is also increasing. Moreover, while the demand for electric energy is increasing day by day, people also put forward higher requirements for power quality, powe...

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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