ABB Relion 670 Series Applications Manual page 169

1MRK 511 401-UUS F
For ANSI inverse time delay characteristics all three types of reset time characteristics are
available; instantaneous (1), IEC (2 = set constant time reset) and ANSI (3 = current dependent
reset time).
For IEC inverse time delay characteristics the possible delay time settings are instantaneous (1)
and IEC (2 = set constant time reset).
For the programmable inverse time delay characteristics all three types of reset time
characteristics are available; instantaneous (1), IEC (2 = set constant time reset) and ANSI (3 =
current dependent reset time). If the current dependent type is used settings
given.
tPCrvx , tACrvx , tBCrvx , tCCrvx : Parameters for programmable inverse time characteristic curve.
The time characteristic equation is according to equation 48:
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EQUATION1722 V1 EN-US
Further description can be found in the Technical reference manual (TRM).
tPRCrvx , tTRCrvx , tCRCrvx : Parameters for customer creation of inverse reset time characteristic
curve. Further description can be found in the Technical Reference Manual.
8.5.3.2 Common settings for all steps
AngleRCA : Relay characteristic angle given in degrees. This angle is defined as shown in figure 79.
The angle is defined positive when the residual current lags the reference voltage (Vpol = -)
Bay control REC670
Application manual
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A
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B TD
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x means step 1, 2, 3 and 4.
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Section 8
Current protection
pr , tr and cr must be
(Equation 48)
GUID-A00A942B-E760-42EE-8FEB-F723426783F3 v1
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