Figure II.97 shows the electrical circuit of the generator excitacy large (above 50 MVA) using a 2-level amplifier current generator (exciter). The first generator amplifier, is direct current generator that generates current relationship shunt generator amplifier for the second amplifier. Amplifier generator (exciter) for synchronous generator is the main generator power taken.
Voltage setting on the main generator is done by adjusting the size of the current excitacy (current gain) or by adjusting potentiometer asut prisoners. Potentiometer or custody asut generator amplifier current amplifier set two main generators produce a current amplifier. In this way the current amplifier set is not too large value (compared with the current generator second amplifier) so that the power loss is not too big on the potentiometer.
PMT current amplifier main generator is equipped to accommodate detainees main generator magnetic field energy because if the main generator amplifier current termination must be disposed of into custody. Now many alternating current generator equipped rectifier to produce direct current that can be used for strengthening the main generator so that the distribution of direct current for strengthening primary generator, by the second amplifier does not require a generator slip ring for.
Rectifier rotates with the shaft generator. Slip rings are used to channel the flow from the first to the field generator amplifier amplifier amplifier second generator. Strengthening the current value is small so the use of slip rings do not cause problems.
Setting the amount of current carried by strengthening the main generator automatic voltage regulator so that the value of the constant generator voltage clamp. Automatic voltage regulation was originally based on mechanical principles, but now has become electronic. The development of the system excitacy excitacy synchronous generator with brushless system, the brush can cause sparks at high speed.
To eliminate the rotating brush is used diodes mounted on the anchor. Figure II.98 shows excitacy system without a brush.
Information
ME: Main Exiter
MG: Main Generator
AVR: Automatic Voltage Regulator
V: Voltage Generator
AC: Alternating Current (alternating current)
DC: Direct Current (direct current)