Integrated metering and protective relay systems

The process of converting sampled analog signals to digital numbers using a low-cost microprocessor and an A/D converter for motor protection is considered. Distribution fault records, relay performance with extremely saturated low ratio current transformers, and advanced methods of protecting high-...

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Bibliographic Details
Published in:IEEE transactions on industry applications 1989-09, Vol.25 (5), p.889-893
Main Author: Zocholl, S.E.
Format: Article
Language:English
Subjects:
Analog-digital conversion
Applied sciences
Connection and protection apparatus
Current transformers
Digital filters
Digital relays
Electrical engineering. Electrical power engineering
Exact sciences and technology
Micromotors
Microprocessors
Protection
Protective relaying
Signal processing
Software maintenance
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Summary:The process of converting sampled analog signals to digital numbers using a low-cost microprocessor and an A/D converter for motor protection is considered. Distribution fault records, relay performance with extremely saturated low ratio current transformers, and advanced methods of protecting high-inertia drive motors are presented. The discussion also covers: digital filtering; range of operation of a digital overcurrent relay; the function of the anti-aliasing filter; advances in motor protection; rotor thermal model; and maintainable structured software.< >
ISSN:0093-9994
1939-9367
DOI:10.1109/28.41254