Three automatically adjust the excitation current method

Three automatically adjust the excitation current method In the change of generator excitation

current,generally does not directly in the rotor circuit,because the loop current is very big,is not

convenient to adjust directly,usually adopted method is to change the excitation exciter Magnetic current,to achieve the purpose of regulating the generator rotor current.The commonly used method is to change the electrical resistance of the exciter excitation circuit,change the additional exciting current exciter,changing the conduction Angle of silicon controlled rectifier,etc.There are primary

change the thyristor turn-on Angle Method,which is based on the change of the generator three phase induction motor voltage,current,or power factor,accordingly change the conduction Angle of silicon controlled rectifier,so generator field current can change accordingly.The device generally by the transistor,thyristor electronic components,has a spirit Sensitive,rapid and no wholesalemotor.blogspot.com failure zone,big output power,the advantages of small volume and light weight.In accident cases can effectively inhibit overvoltage and achieve rapid out magnetic generator.

Automatically adjust the excitation device usually by measuring unit,synchronous unit,amplification unit, Controlled unit,stable unit,the limited unit and some auxiliary units.Be measured signals (such as voltage,current,etc.),compared with the given value after measurement unit conversion,and then compare the results (bias) the preamplifier unit and power amplifier unit Amplifier,and is used to control thyristor conduction Angle,in order to achieve the purpose of adjusting ac geared motor the generator excitation current.The function of synchronous unit is to phase shifting part of the output of the trigger pulse synchronization with silicon controlled rectifier ac excitation power supply,to ensure the correctness of silicon control triggering.Controlled unit is used in order to make the parallel operation of generator can be stable and reasonable allocation of reactive load.Stable unit is in order to 220v ac electric motor simprove the stability of power system and the introduction of unit.The excitation system stable unit To improve the stability of excitation system.limit Unit is in order to make the generator is not under the condition of excitation or underexcitation run.It must be noted that not every kind of automatic regulating excitation device has the various units,a regulator device of unit with its specific tasks The relevant.