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DC resistive type superconducting fault current limiters (SFCL) can be used in multi-terminal DC systems for fault current limiting. They help DC circuit breakers interrupt fault current with lower interruption overvoltage and they improve the interruption reliability. Insulation design is necessary for the application of SFCLs. The objective of this paper is to design the insulation of DC resistive...
With a capacity increase of the power system, the fault current increases very quick and it becomes a threat for other equipment in the power system. Vacuum interrupter combined with an electromagnetic repulsion mechanism can achieve a very fast opening operation. It can be designed to interrupt the high fault current approaching a zero-crossing point so that the interrupting capacity can be enhanced...
The stray parameters of a double-break vacuum circuit breaker (VCB) have a significant influence on the voltage distribution of the two breaks. The stray parameters are equivalent to two main equivalent capacitors. The two main equivalent capacitors are the equivalent break capacitor (C1) and the equivalent capacitor between the middle point of the two breaks and earth (C2). The objective of this...
The objective of this paper is to present a 126-kV/40-kA–2500-A single-break vacuum circuit breaker (VCB) and its type test results based on the IEC 62271-100: 2006 and GB1984-2003 standards. A single-break 126-kV vacuum interrupter (VI), with a pair of 2/3 coil-type contacts, is used in the 126-kV VCB. The external insulation of the VI is provided by at 0.1 MPa. A spring-type operating...
Resistance type superconducting fault current limiter (SFCL) is a promising current limiter. It needs to fulfill the requirement of O-CO-CO duty in power system. So quench recovery time of YBCO superconducting tapes is very important. When superconducting tape is used in SFCL, insulation supporter should be used to support superconducting tapes and insulate it. There are many researches on quench...
According to the relevant IEC standards, the back-to-back capacitor banks switching tests need to withstand an inrush current of 20 kA (peak) with 4250 Hz frequency. For vacuum interrupters (VIs), the contact surfaces may be seriously damaged by the high inrush current. The objective of this paper is to investigate how the inrush current influences the field emission current of VIs under power-frequency...
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