NDLI: Avoiding loss of voltage sensing runaway for generator excitation systems

Content Provider	IEEE Xplore Digital Library
Author	Buscher, D.
Copyright Year	2011
Description	Author affiliation: Basler Electric, 12570 State Route 143, Highland, IL 62249, USA (Buscher, D.)
Abstract	The excitation system, synchronous generator and connected loads of an electrical power system can incur serious damage if a generator's sensing voltage input to the automatic voltage regulator (AVR) is lost. There are various conditions that may cause loss of sensing voltage to the excitation system, such as blown Potential Transformer (PT) fuses, failed PTs, mechanical connection problems, and sometimes even human error. The design and features of a voltage regulator/excitation system will define how the excitation system will react to a Loss of Sensing Voltage condition. Normal voltage regulation operation requires that if the Automatic Voltage Regulator's sensed generator voltage is lower than the AVR's regulation set point, the AVR will respond by increasing field current until the sensed generator voltage satisfies the AVR. Without additional excitation limiters or protective functions to detect a problem, an AVR operating without generator sensing voltage will produce maximum available field current and potentially cause damage to some element of the electrical power system. This paper addresses the protective safeguards commonly built into excitation systems to manage Loss of Voltage Sensing events and prevent power system equipment damage.
Starting Page	120
Ending Page	123
File Size	1616729
Page Count	4
File Format	PDF
ISBN	9781612842721
ISSN	01902172
e-ISBN	9781612842714
DOI	10.1109/PPIC.2011.5983254
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Generators Sensors Regulators Relays Automatic voltage control Threshold voltage Excitation Limiter Overvoltage Loss of Sensing AVR Voltage Regulator Positive Sequence Voltage Negative Sequence Voltage
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Electrical and Electronic Engineering

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Coordination of generator protection with generator excitation control and generator capability

Coordination of digital excitation system settings for reliable operation

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Avoiding loss of voltage sensing runaway for generator excitation systems

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