Setting parameters..........................................................................390
Technical data.................................................................................396
Instantaneous residual overcurrent protection EFPIOC (50N).............396
Introduction......................................................................................397
Principle of operation.......................................................................397
Function block.................................................................................397
Input and output signals..................................................................398
Setting parameters..........................................................................398
Technical data.................................................................................398
Four step residual overcurrent protection, zero, negative sequence
direction EF4PTOC (51N/67N).............................................................399
Introduction......................................................................................399
Principle of operation.......................................................................400
Operating quantity within the function........................................400
Internal polarizing.......................................................................401
External polarizing for ground-fault function...............................403
Base quantities within the protection..........................................404
Internal ground-fault protection structure....................................404
Four residual overcurrent steps..................................................404
Directional supervision element with integrated directional
comparison function...................................................................405
Second harmonic blocking element............................................408
Switch on to fault feature............................................................410
Function block.................................................................................413
Input and output signals..................................................................414
Setting parameters..........................................................................415
Technical data.................................................................................420
Four step directional negative phase sequence overcurrent
protection NS4PTOC (46I2)..................................................................421
Introduction......................................................................................421
Principle of operation.......................................................................422
Operating quantity within the function........................................422
Internal polarizing facility of the function.....................................423
External polarizing for negative sequence function....................424
Base quantities within the function.............................................424
Internal negative sequence protection structure.........................424
Four negative sequence overcurrent stages..............................424
Directional supervision element with integrated directional
comparison function...................................................................426
Function block.................................................................................429
Table of contents
10
Technical reference manual
Содержание Relion 670 series
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