Application Of Capacitor Banks Research Articles

고조파를 포함하는 부하용 변압기 용량 산정에 관한 연구

비선형 부하의 증가는 변압기에 고조파 전류를 증가시키는 요인이 되고 있다. 변압기에 고조파 전류가 유입되면 손실이 증가되고, 변압기 출력이 감소되어야 한다. 본 논문에서는 고조파를 고려한 부하의 변압기 용량 산정법을 제시하고, 직렬리액터가 연결된 커패시터 뱅크와 고조파 필터의 적용으로 변압기 출력을 증가시킬 수 있음을 검증하였다. 사례연구의 시뮬레이션은 EDSA 프로그램을 사용하였다.

A practical approach in substation capacitor bank applications to calculating, limiting, and reducing the effects of transient currents

When two or more capacitor banks are in parallel on a common bus, the back-to-back switching of a bank against one or more already energized banks can produce high peak transient in-rush current values. Typically, these currents can exceed the available fault current levels previously present at the bus. The presence of inductance and capacitance together makes the transients oscillatory. Because of close circuit coupling, the transient frequency is generally several kilohertz or higher and usually decays to zero in a fraction of a 60-Hz cycle. The relatively high level and short duration of these currents can damage substation and control equipment necessitating that appropriate precautions be taken during the design process. This paper explores the methods for estimating capacitor bank transient currents, based on ANSI/IEEE C37.012-1979, for various sizes, voltages, and configurations of real world capacitor bank installations. Also discussed are the various accepted and applied methods for limiting substation equipment susceptibility to transients, as well as reducing the magnitude of the transients themselves.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Measurements of fuse and resistor characteristics for multimegajoule capacitor bank application

Experimental tests have been conducted on commercially available fuses and resistors under fast high-voltage pulsed (10-μs) conditions to determine their ability to protect capacitor bank components during faults. Currents in the resistors ranged from 20 to 40 kA per resistor. The experimental results for the fuses have been compared to the manufacturer’s data for minimum melt and maximum let-through action integrals and to exploding bridge wire computer models.

Consideration of Phase-to-Phase Surges in the Application of Capacitor Banks

Consideration of Phase-to-Phase Surges in the Application of Capacitor Banks

Consideration of Phase-to-Phase Surges in the Application of Capacitor Banks

The energization of capacitor banks can result in high phase-to-phase surges at locations in a power system other than the substation where the capacitor bank is being switched. The probability of obtaining high phase-to-phase surges is greater for ungrounded capacitor banks than for grounded banks. These surges are highest at a substation which is fed radially from the bus with the capacitor bank. The phlase-to-phase surges are a threat to the insulation of three-phase transformers in the radial substation. Plhase-to-ground surge arresters on the transformers are not very effective in protecting them from these surges because the surges are comprised of line-to-ground components which are approximately equal in magnitude and opposite in polarity. Therefore, the phase-to-phase surges could only be limited by arresters to two times the arrester protective level. Closing resistors in the switching device used to energize the capacitor banks are very effective in reducing the phase-to-phase surges.