☑ Exciter Diode Failure

If a rectifier shorts a very high current flows through the associated exciter armature winding thus causing excessive heating and probable failure of the exciter. There are three exciter diodes on all alternators.

Brushless Exciters For Turbine Generators

Pdf Detection Of Rotating Diode Failure Condition Its

Field Diodes Blowing On 1000 Kw Diesel Generator Electric

Regime rectifier diodes can fail either open or short circuit fig.

Exciter diode failure. Other component failures are addressed including fuses and diodes phase leads glass and wire banding and coils. Email protected abolfazl vahedi professor of iran university of science technology tehran iran email. If a rectifier opens the voltage regulator will substantially increase the excitation to maintain the operating level.

Have you recorded data similar to what you have from the failure when it doesnt have a problem. Chapter 3 generator excitation and voltage control 31 general the excitation of a generators field system has already been mentioned in chapter 2 as it is not possible to describe ac. The exciter is staked from pmgpilot exciter avr exciter stator exciter rotor finally to main field winding.

This paper focused on the condition monitoring of rotating rectifier diodes in brushless exciter. The purpose of the diodes is twofold. Rotary diode failure detection in brushless exciter system of power plant synchronous generator mehdi rahnama phd.

This paper presents options to prevent or at least minimize contamination and also steps to take if contamination occurs in order to inhibit a potential failure. It ensures that the consequences of a failure are minimized and possible damage to the machine is prevented. Brushless three phase synchronous generator under rotating diode failure conditions mohamed salah khmais bacha abdelkader chaari and mohamed benbouzid senior member ieee m.

Typical architecture of brushless synchronous generators. They are connected to the stator windings. Two common types of diode failures such as diode open circuit and diode short circuit on the one.

Diodes failure detector 3 3 1. The broken diode and thyristor is at the exciter rotor put in generator shaft unfortunately i cant attach the drawing. While the engine is running it turns off the alternator.

Student of iran university of science technology tehran iran email. Introduction 11 generalities the diode failure detector is an electronic unit designed to detect the failure of a shaft mounted diode in the brush less generator. The diodes fail by either going open circuit or short circuit.

Since you have repeated failures of the diodes have you done some further checking like making sure the exciter rotor is good the surge suppressor is ok the pmg voltage is not falling off. Generators without referring to their field system and excitation.

Behavior Of Brushless Generator With Single Diode Fault