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UNIT 9 TRANSISTORIZED VOLTAGE REGULTOR
AIM OF THE UNIT:-to understandtransistorized voltage regultor
1 Do your best to answer the brainstorming question. 2 Read the text for general understanding.
3 Make up questions to the text. 4 Find the sentences with the new words in the text. Give the Kazakh or Russian
equivalents of the words.
5 Write sentences with the new vocabulary. 6 Make up exercises as in the UNIT 2page 210(Exercises for better remembering the topic).7 Speak on the topic. Given schemes will help you to remember and understand
8 Find more information about the topic and make up a project work on the topic.
The voltage regulator senses three phase voltage at the point of regulation. The average of all three phases is compared to a reference value and the resultant signal is fed to a summing network. The summing circuit senses the need for increased or decreased excitation.Output transistors in the final stage of the voltage regulator provide a pulse width modulated signal to the exciter field by switching the PMG current on and off. Voltage amplitude is maintained constant while the on/off pulse is varied according to excitation requirements.