Common Settings For All Steps - ABB RELION RET670 Applications Manual

Section 9
Current protection
9.5.3.2
554
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
pr, tr and cr must be given.
tPCrvx, tACrvx, tBCrvx, tCCrvx: Parameters for programmable inverse time
characteristic curve. The time characteristic equation is according to equation 434:
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t s
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C
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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.

Common settings for all steps

x means step 1, 2, 3 and 4.
AngleRCA: Relay characteristic angle given in degrees. This angle is defined as shown
in figure 276. The angle is defined positive when the residual current lags the reference
voltage (Vpol = -)
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÷
÷
+ ×
B TD
÷
÷
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1MRK 504 163-UUS A
(Equation 434)
GUID-A00A942B-E760-42EE-8FEB-F723426783F3 v1
Transformer protection RET670 2.2 ANSI
Application manual