Electrical performance of a Portable Protective Gap (PPG) in a compact 550-kV tower. Final report
- Electric Power Research Inst., Lenox, MA (United States). High Voltage Transmission Research Center
This report presents the results of a research project by Western Area Power Administration (Western) on the application of a Portable Protective Gap (PPG) to live working, on Western`s upgraded compact 550 kV tower type 51S. The objective of the project was to provide experimental evidence that confirms the needed coordination of the PPG sparkover characteristics with those of the 51S tower during live working conditions. These conditions include the presence of damaged porcelain cap-and-pin insulators, the worker, and live working tools and equipment in normal work positions. The tested PPG is a portable rod-rod 1.04 m (41 inches) gap, which would be installed on the tower adjacent to the worksite. The purpose of the PPG is to protect the worker by providing positive control of the transient overvoltage (TOV) at the worksite. That is, the PPG must operate (spark over) at a TOV level which is lower then the level that would cause a disruptive discharge (sparkover or flashover) at the worksite. The worksite disruptive discharge level. or conversely the worksite withstand level is dependent on a large number of factors, including presence and location of the worker, presence and location of live working tools and equipment, and number and location of damaged porcelain (cap-and-pin) insulators at the worksite. The PPG must not spark over at the system`s normal AC operating, voltage, i.e. its AC withstand level must be higher than AC stresses expected at the worksite.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); Electric Power Research Inst., Lenox, MA (United States). High Voltage Transmission Research Center
- Sponsoring Organization:
- Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 10107039
- Report Number(s):
- EPRI-TR-103860; ON: UN95005448; TRN: 95:000862
- Resource Relation:
- Other Information: PBD: Nov 1994
- Country of Publication:
- United States
- Language:
- English
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