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
[ ]
=
+
×
-
>
æ
ö
ç
÷
ç
÷
ç
÷
æ
ö
ç
÷
ç
÷
è
ø
è
ø
p
A
t s
B k
i
C
in
EQUATION1189 V1 EN-US
(Equation 490)
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
GUID-A00A942B-E760-42EE-8FEB-F723426783F3 v1
x means step 1, 2, 3 and 4.
AngleRCA: Relay characteristic angle given in degrees. This angle is defined as shown in
figure
. The angle is defined positive when the residual current lags the reference voltage
(Upol = -U2)
Section 8
1MRK 505 343-UEN B
Current protection
432
Application manual
Содержание Relion 670 series
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