Development, testing, and evaluation of algorithms for the protection of electric power systems using digital computers

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1977

OSTI ID:5176912

Schweitzer, III, E O

Over the past ten years, considerable research has been performed on the application of digital computer technology to the protection of electric power systems. The development of the microprocessor provides a new direction in such research. Instead of endeavoring to protect an entire substation with a single minicomputer, greater autonomy results if separate protection tasks are implemented in independent processors. The microprocessor may make such an approach feasible. With this in mind, a research project was undertaken to develop computationally efficient algorithms for transmission line and power transformer protection. Several suitable algorithms were developed, then tested by computer simulation. These tests provided sufficient justification to design and construct hardware for implementing and testing the algorithms. The hardware test system was designed around a microcomputer using the Motorola MC6800 microprocessor, and the algorithms were implemented in software for that microprocessor. An important part of the test system is the data acquisition system, which interfaces the analog time-continuous domain of the input quantities to the digital time-discrete domain of the computer. A key development was the application of simple finite-duration impulse response (FIR) digital filtering techniques to the algorithms. The impulse responses of the FIR filters were restricted to values of plus or minus one at any instant to simplify the computation of filter output quantities. No multiplications or divisions are required; this minimized the computational burden on the microprocessor and eliminated the need for a hardware multiplier.

• OSTI ID: 5176912
• Country of Publication: United States
• Language: English

Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
ALGORITHMS
COMPUTERS
CONTROL SYSTEMS
DIGITAL COMPUTERS
ELECTRICAL EQUIPMENT
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MICROPROCESSORS
PERFORMANCE TESTING
POWER SUBSTATIONS
POWER SYSTEMS
POWER TRANSMISSION LINES
RELAYS
SAFETY
TESTING
TRANSFORMERS