Title :
Integrated metering and protective relay systems
Author :
Zocholl, Stanley E.
Author_Institution :
Westinghouse ABB Power T&D Co., Allentown, PA, USA
Abstract :
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
Keywords :
electric motors; machine protection; microcomputer applications; power engineering computing; relay protection; A/D converter; anti-aliasing filter; digital filtering; digital overcurrent relay; distribution fault records; high-inertia drive motors; maintainable structured software; metering; microprocessor; motor protection; protective relay systems; relay performance; rotor thermal model; saturated low ratio current transformers; Analog-digital conversion; Current transformers; Digital filters; Digital relays; Micromotors; Microprocessors; Protection; Protective relaying; Signal processing; Software maintenance;
Journal_Title :
Industry Applications, IEEE Transactions on
