IEEE C37.015-1993 pdf free.IEEE Application Guide for Shunt Reactor Switching.
IEEE C37.015 Shunt reactor load currents are referred to generically as small inductive currents. The capability of circuit breakers tointerrupt small inductive currents is generally not a concern.The circuit breaker will typically interrupt the current atthe first current zero after contact parting, but may not be immediately capable of withstanding the high magnituderecovery voltages that can then appear across the contacts. This can result in a reignition followed by an additionalloop of rated frequency current and successful interruption.Refer to 3.5.
The interrupting time of a circuit breaker，when switching shunt reactor load currents,is the interval betweenenergization of the trip coil and the interruption of the current in all poles on an opening operation. Refer to 3.3 and 6.8.
An important consideration for application of circuit breakers for shunt reactor current switching are the transientovervoltages generated on interruption of the current and by subsequent reignitions.Refer to clause 4.
Circuit breakers applied for switching shunt reactors may or may not be required to have a fault-interrupting capability.In the later case, the through fault capability of the circuit breaker should equal the fault level applicable to the shuntreactor location.
Shunt reactors are switched frequently, often daily, to control and compensate for changes in system loading andconfiguration. In the selection of a circuit breaker for this duty, consideration should be given to this matter.
Given that shunt reactor switching is interactive, characteristics of the reactor and the circuit have to be considered.Shunt reactor characteristics are discussed in annex A,while applicable system and station characteristics arediscussed in annex B.
The general derivation of chopping and reignition overvoltage values, discussed in 4.2,4.3,and 4.4, is given in annexC, while annex D discusses the oscillation modes associated with the current interruption and reignition process.
Annex E, complemented by annex F, describes how laboratory test results can be used to calculate circuit breakerperformance and expected overvoltages in actual shunt reactor installations.IEEE C37.015 pdf download.