Modeling relay operational characteristics using electromagnetic transients program
- Nanyang Technological Univ., Singapore (Singapore)
There are many commercially available software packages nowadays for power system analysis. These range from load flow, stability, contingency and reliability analysis. The Electro-Magnetic Transients Program is a widely used program for simulation and analysis of power system transients. The Transient Control Analysis Systems, the so-called (TACS) of the EMTP, functions like an analogue computer. This allows signals to be passed between TACS and the electric network simulated by EMTP. In fact, with TACS facilities, it is possible to simulate control circuitry associated with rotating machinery, hvdc converters and static var controllers. It is also possible to extend the application of EMTP to relay testing. If relay models are simulated within the EMTP environment, then it becomes a close-loop simulation as the operation of a particular relay, and thus the associated circuit breaker, would change the system conditions. Subsequent relay operations can then be further investigated. In this manner, dynamic operation of relays can be studies solely on a personal computer with no external hardware arrangement necessary. This paper describes the basic techniques used for simulation of distance relays, such as a self and cross-polarized distance relay commonly used for the protection of transmission circuits. This paper highlights some techniques employed to model dynamic operational characteristics of distance relays using EMTP. Simulation results of a self- and a cross-polarized Mho relay are presented.
- OSTI ID:
- 438731
- Report Number(s):
- CONF-951136--; ISBN 0-7803-2981-3
- Country of Publication:
- United States
- Language:
- English
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