Performance and analysis of controlled switching on a transmission system
- Resource Type
- Conference
- Authors
- Cowhey, Eoin; O'Donovan, Michael; Connell, Joe
- Source
- 2016 51st International Universities Power Engineering Conference (UPEC) Power Engineering Conference (UPEC), 2016 51st International Universities. :1-6 Sep, 2016
- Subject
- Power, Energy and Industry Applications
Circuit breakers
Switches
Capacitors
Surges
Transient analysis
Switching circuits
Capacitor bank
Circuit breaker
Controlled switching
Point on wave switching
Rate of decrease of dielectric strength (RDDS)
Rate of rise of dielectric strength (RRDS)
- Language
Controlled switching is a solution for the reduction and elimination of high frequency transient currents and voltages that occur during the switching of reactive plant (shunt capacitor banks and reactors). This type plant may be frequently switched by system operators in order to maintain acceptable voltage limits and therefore if switching is uncontrolled, this may present significant power quality problems to the network as well as increased stress and reduction of lifetime to substation equipment. The most common and economical method of controlled switching is point on wave control of circuit breakers with individual pole operating mechanisms. By controlling the point on the voltage waveform that the switching device energizes or interrupts the load, significant inrush currents and transient overvoltage's can be eliminated. These methods are based on experience and analysis which specifically applies the Irish Transmission Network.