synonymAC excited generator(AC excited generator) generally refers to AC exciter
AC exciter,Synchronous generatorThe excitation current is supplied by AC exciter after rectifier rectification.
Chinese name
AC exciter
Foreign name
excitationwithACexciter
Current
communication
Properties
equipment
AC exciter
Synchronous generatorThe excitation current is supplied by AC exciter after rectifier rectification.Classified according to whether the rectifier rotatesStatic rectifier excitationandRotating rectifier excitationTwo types.These two excitation modes can be divided into uncontrolled rectifier excitation and controlled rectifier excitation according to whether the rectifier is controllable.The excitation mode of AC exciter is due toDC exciterIt can not meet the needs of generator capacity growth and is developed. In the early AC excitation system, the rectifier elements areMercury arcRectifiers and thyristors have problems such as bulky devices, large floor area, complex control, troublesome maintenance and short service life of components.It was not until the appearance of high-power semiconductor rectifier in the late 1950s that the excitation mode of AC exciter was developed rapidly.Since the AC exciter does not have the problem of current commutation, its manufacturing capacity can be improved, and the maintenance workload is small, so it can be used in large capacityTurbine generatorGenerally used in.Uncontrolled rectification excitation mode of AC exciter can provideExcitation system top voltageThe multiple is generally 1.2~2.0 times, and the voltage growth rate is 0.5~1.0 times/s.AC exciter controllable rectifier excitation systemhigh initial response excitation system , generally up to 2-4 times.The frequency of AC exciter is relatively high, generally 100~400Hz multiple of its top voltage.
