Cold-insulating high-temperature superconducting cable superconductivity losing detecting circuit and detecting method thereof

Abstract

The invention belongs to the technical field of electrical power systems, and discloses a cold-insulating high-temperature superconducting cable superconductivity losing detecting circuit and a detecting method of the cold-insulating high-temperature superconducting cable superconductivity losing detecting circuit. The superconductivity loosing detecting circuit comprises a first current sensor, a second current sensor, a first optical coupling isolation circuit, a second optical coupling isolation circuit, an analog division circuit and a comparison circuit. The first current sensor and the first optical coupling isolation circuit are connected to form a first collecting and isolating circuit. The second current sensor and the second optical coupling isolation circuit are connected to form a second collecting and isolating circuit. The first collecting and isolating circuit and the second collecting and isolating circuit are connected with the analog division circuit and the comparison circuit respectively in sequence. Through the detecting circuit and the detecting method, the superconductivity losing failure of a superconducting cable can be fast detected, and detecting accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a quench detection circuit and a detection method of a cold-insulated high-temperature superconducting cable. Background technique [0002] In 1911, the Dutch scientist H. Kamerlingh Onnes first discovered superconductivity in mercury at 4.2K. Since then, using the zero-resistance characteristic of superconductors to reduce losses has become the dream of electric workers. But until recent years, with the increasing maturity of superconducting application research, high-temperature superconducting cable transmission technology has gradually entered the stage of engineering application. Superconducting cable transmission technology has significant advantages such as large transmission capacity, low loss, small footprint, energy saving and environmental protection, and has gradually become one of the important development directions of current power transmission te...

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Problems solved by technology

[0003] However, the zero-resistance characteristic of high-temperature superconducting cables can only be obtained under the premise that the cables are operating in a superconducting state. The conductive strip will lose its zero-resistance property and become a normal conductor (quench fault for short). The transmission power is very large, which will endanger the safe and stable operation of the entire power system

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