Continuing in the bestselling tradition of the previous editions by the late j lewis blackburn protective relaying principles and applications third edition retains the fundamentals of protection relays and power system protection while incorporating new developments in the field. Of protective relays and associated circuits fist 3 8 operation and maintenance of protective relays and associated circuits 5c program element number 5d project number third edition section 152 2001 ieee std c372 standard electrical power system device function numbers. Protective relays using electrical quantities are connected to the power system through current transformer ct or voltage transformer vt these input devices or instrument transformers provide insulation from the high power system voltages and reduce the magnitudes to practical secondary levels for the relays. Note citations are based on reference standards however formatting rules can vary widely between applications and fields of interest or study the specific requirements or preferences of your reviewing publisher classroom teacher institution or organization should be applied
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