Abstract
It is effective to open the bus-coupler circuit breaker in case of a short-circuit fault. A fast vacuum circuit breaker (FVCB) is an ideal bus-coupler circuit breaker due to its high velocity. The objective of this study was to develop and test a 252 kV/2500 A-40 kA multi-break bus-coupler FVCB. The 252 kV FVCB contained 12 FVCB units. Each phase consisted of four FVCB units connected in series. Each FVCB unit had an electromagnetic repulsion mechanism with an average opening velocity reaching 6.5 m/s. Test results showed the opening time was 1.11 ± 0.08 ms. The capacitance of the voltage grading capacitor of each break was determined to be 10 nF. The prototype 252 kV bus-coupler FVCB passed all partial test duties according to the IEC 62271-100: 2008 and IEC 62271-1: 2007 standards, which include an insulation test and a terminal fault test among others. A 252 kV/2500 A-40 kA multi-break bus-coupler FVCB can be used to quickly cut off a short-circuit fault and effectively limit a short-circuit current.
Highlights
Each of the four breaking units in each phase of the 252 kV/2500 A-40 kA consists of a 40.5 kV fast vacuum circuit breaker (FVCB)
Each module consists of eight parts: a vacuum interrupter (VI), an electromagnetic repulsion actuator, a current transformer, grading capacitors, and damping resistors, a battery bank, a controller, a generator, and a boost circuit module
This paper proposes a multi-break fast vacuum circuit breaker suitable for 252 kV
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. In terms of the grid structure, the transmission voltage level can be improved by splitting the lower-level grid into operations, such as multi-bus split operation or segmented operation This is a very effective and feasible short-circuit current limiting measure, which has been widely used in power systems at home and abroad. In order to effectively limit the short-circuit current, it is very necessary to develop a high-voltage vacuum circuit breaker with a fast opening velocity and low dispersion. The fast vacuum circuit breaker (FVCB) is operated by an electromagnetic repulsion mechanism It has a shorter opening and closing time, so it is an ideal choice for breaking fault current The electromagnetic repulsion mechanism was first proposed in the 1960s [5]. It turns out that the 252 kV FVCB has great potential to improve the characteristics of a power system
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