Use of Oscillograph Records to Analyze System Performance

Authored by: John R. Boyle

Power System Stability and Control

Print publication date:  April  2012
Online publication date:  April  2016

Print ISBN: 9781439883204
eBook ISBN: 9781439883211
Adobe ISBN:

10.1201/b12113-8

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Abstract

Protection of present-day power systems is accomplished by a complex system of extremely sensitive relays that function only during a fault in the power system. Because relays are extremely fast, automatic oscillographs installed at appropriate locations can be used to determine the performance of protective relays during abnormal system conditions. Information from oscillographs can be used to detect the:

Presence of a fault

Severity and duration of a fault

Nature of a fault (A phase to ground, A–B phases to ground, etc.)

Location of line faults

Adequacy of relay performance

Effective performance of circuit breakers in circuit interruption

Occurrence of repetitive faults

Persistency of faults

Dead time required to dissipate ionized gases

Malfunctioning of equipment

Cause and possible resolution of a problem

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