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Studies on the Overvoltage for Eliminating 750 kV Circuit Breaker Pre-inset Resistor

SU Yu-ping

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Abstract

Eliminating pre-inset resistor of 750 kV circuit breaker can save costs and increase operation stability.A arresters were installed at both ends of 750 kV high voltage transmission line to suppress switching overvoltage.The effects of the number and positions of arrestor on the 750 kV Lanzhoudong-Yinchuandong transmission line on the switching over voltages,including three phases energizing line without load and single phase auto-reclosing,were analyzed using the electromagnetic transient program(ATP-EMTP).The results show that without any arresters,the maximum overvoltage while three phase energizing line with no load is 2.38 p.u.and for single auto-reclosing is 2.57 p.u.when the line is shorter and the install surge arresters at both ends,the ways can operate the above-mentioned two types of statistical overvoltage suppression to below 1.80,it can be seen when the abolition of the short circuit switch resistance is possible.

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Eliminating pre-inset resistor of 750 kV circuit breaker can save costs and increase operation stability.A arresters were installed at both ends of 750 kV high voltage transmission line to suppress switching overvoltage.The effects of the number and positions of arrestor on the 750 kV Lanzhoudong-Yinchuandong transmission line on the switching over voltages,including three phases energizing line without load and single phase auto-reclosing,were analyzed using the electromagnetic transient program(ATP-EMTP).The results show that without any arresters,the maximum overvoltage while three phase energizing line with no load is 2.38 p.u.and for single auto-reclosing is 2.57 p.u.when the line is shorter and the install surge arresters at both ends,the ways can operate the above-mentioned two types of statistical overvoltage suppression to below 1.80,it can be seen when the abolition of the short circuit switch resistance is possible.

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Available abstract

Eliminating pre-inset resistor of 750 kV circuit breaker can save costs and increase operation stability.A arresters were installed at both ends of 750 kV high voltage transmission line to suppress switching overvoltage.The effects of the number and positions of arrestor on the 750 kV Lanzhoudong-Yinchuandong transmission line on the switching over voltages,including three phases energizing line without load and single phase auto-reclosing,were analyzed using the electromagnetic transient program(ATP-EMTP).The results show that without any arresters,the maximum overvoltage while three phase energizing line with no load is 2.38 p.u.and for single auto-reclosing is 2.57 p.u.when the line is shorter and the install surge arresters at both ends,the ways can operate the above-mentioned two types of statistical overvoltage suppression to below 1.80,it can be seen when the abolition of the short circuit switch resistance is possible.

Key concepts: Overvoltage, Circuit breaker, Electrical engineering, Resistor, Surge arrester, Lightning arrester, Sulfur hexafluoride circuit breaker, Transmission line

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Studies on the Overvoltage for Eliminating 750 kV Circuit Breaker Pre-inset Resistor — Research Paper | ScholarLens