| Type of Document |
Master's Thesis |
| Author |
Hunt, Richard K.
|
| Author's Email Address |
rhunt@vt.edu |
| URN |
etd-2598-11226 |
| Title |
Hidden Failure in Protective Relays: Supervision and Control |
| Degree |
Master of Science |
| Department |
Electrical and Computer Engineering |
| Advisory Committee |
| Advisor Name |
Title |
| Phadke, Arun G. |
Committee Chair |
| Broadwater, Robert P. |
Committee Member |
| Liu, Yilu |
Committee Member |
|
| Keywords |
- Relay
- Protection
- Power Systems
- Computer
|
| Date of Defense |
1998-02-26 |
| Availability |
unrestricted |
Abstract
This thesis performs a simulation of a relay supervisory system (RSS) that works
passively in conjunction with the existing protective relaying system at a substation.
During normal system operating conditions, the RSS supervises the relay system to
prevent trips due to hidden failures. During wide area network disturbances, it adapts the
relay system to increase security of the power system. The RSS works passively in the
sense that it waits for events to occur in the existing relay system before taking any
action.
The simulation performed includes a model of the RSS, along with simplified
models of existing relays, performed in Matlab. A power system model in EMTP
provides inputs to the RSS model. Multiple faults are applied to the EMTP model, and
the RSS is tested under each fault condition, and with a variety of relay hidden failures.
For all tests performed, the simulation of the RSS successfully prevents relay hidden
failures from removing circuit elements inadvertently, while allowing correct relay
operations to remove circuit elements.
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