Real-time transient testing and performance of transformer differential relays

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:415505

Stringer, N T; Lawhead, L; Wilkerson, T; Biggs, J ^[1]; Rockefeller, G D ^[2]

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1. Basler Electric Co., Highland, IL (United States)
2. Rockefeller Associates, Inc., Morris Plains, NJ (United States)

Differential relays are used extensively to provide protection for power transformers. Several issues must be considered in their application to ensure adequate protection. These include transformer magnetizing inrush current, relay burden and current transformer performance. The use of low ratio current transformers in high magnitude fault applications can produce distorted secondary waveforms to the relay whose performance may be directly affected. There is also a relationship between the magnetizing inrush and current transformer performance which may affect the operation of the differential relay. This paper discusses these specific applications and the testing of a transformer differential relay under conditions of saturated CT`s using the Electro-Magnetic Transient Program (EMTP).

• OSTI ID: 415505
• Report Number(s): CONF-9510203--
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
E CODES
ELECTRICAL TRANSIENTS
EQUIPMENT PROTECTION DEVICES
PERFORMANCE TESTING
POWER DISTRIBUTION SYSTEMS
RELAYS
TRANSFORMERS