Elctronic current transducer for ehv circuits. Final report
As ehv and uhv grow a need arises for better current measuring methods. Conventional live tank current transformers become much larger and more costly as voltage withstand requirements become higher. Better accuracy is desirable as larger power flow occurs on interties between power systems. Improved high frequency response is required for advanced high speed relaying techniques and for current limiter operation. Previous current transducers have fulfilled some, but not all, of these requirements. The objective of this project is to provide an electronic current transducer that meets present and projected requirements. The specific objective of this project was to develop an electric current transducer with (1) amplitude error less than 0.3%; (2) dynamic range of twenty times rated current; (3) 10 kHz frequency response; (4) less than 100 ..mu..s turn on time; (5) digital output; and (6) utilizing fiber optic data transmission for EMI free operation. The project objectives have been met except that turn-on-time is 200 ..mu..s. The transducer developed utilizes a conventional current transformer and shunt to provide a reference signal to the electronic encoding system. The encoder power supply is obtained from a current transformer on the transmission line. No auxiliary power supply is required. The encoded data signal is transmitted serially over a single conductor optical fiber cable to the station control room, a distance of up to 300 m. The signal is decoded and converted to parallel digital output and an analog output signal is reconstructed too. This analog signal provides +-10V output to represent full scale peak line current.
- Research Organization:
- Westinghouse Electric Corp., Trafford, PA (USA)
- OSTI ID:
- 6773226
- Report Number(s):
- EPRI-EL-1611
- Country of Publication:
- United States
- Language:
- English
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EHV AC SYSTEMS
POWER SUBSTATIONS
ELECTRIC CURRENTS
TRANSDUCERS
DESIGN
PERFORMANCE
UHV AC SYSTEMS
ELECTRONIC EQUIPMENT
PERFORMANCE TESTING
TEMPERATURE GRADIENTS
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CURRENTS
EQUIPMENT
POWER SYSTEMS
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200301* - Power Transmission & Distribution- AC Systems
EHV & UHV- (-1989)