ABB Relion 670 series - Page 584

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CVGAPC function
IED
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Current and voltage selection
settings
Selection of which current
and voltage shall be given to
the built-in protection
elements
Restraint current selection
Selection of restraint current
Selected current
Selected voltage
Selected restraint current
52
ANSI05000169_2_en.vsd
ANSI05000169 V2 EN
Figure 293: Treatment of measured currents within IED for CVGAPC function
Figure 293 shows how internal treatment of measured currents is done for
multipurpose protection function
The following currents and voltages are inputs to the multipurpose protection function.
They must all be expressed in true power system (primary) Amperes and kilovolts.
1. Instantaneous values (samples) of currents & voltages from one three-phase
current and one three-phase voltage input.
2. Fundamental frequency phasors from one three-phase current and one three-phase
voltage input calculated by the pre-processing modules.
3. Sequence currents & voltages from one three-phase current and one three-phase
voltage input calculated by the pre-processing modules.
The multipurpose protection function:
Section 10 1MRK505222-UUS C
Multipurpose protection
578
Technical reference manual