ABB Relion 670 Series Applications Manual page 165

1MRK 511 401-UEN Rev. K
Operate time
tx
txMin
IEC10000058 V2 EN-US
Figure 79: Minimum operate current and operation time for inverse time characteristics
ResetTypeCrvx : The reset of the delay timer can be made in different ways. By choosing
setting there are the following possibilities:
Curve name
Instantaneous
IEC Reset (constant time)
ANSI Reset (inverse time)
The different reset characteristics are described in the Technical Reference Manual (TRM).
There are some restrictions regarding the choice of reset delay.
For the independent time delay characteristics the possible delay time settings are
instantaneous (1) and IEC (2 = set constant time reset).
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
must be given.
tPCrvx , tACrvx , tBCrvx , tCCrvx : Parameters for programmable inverse time characteristic
curve. The time characteristic equation is according to equation 48:
æ
ç
ç
[ ] =
t s
ç
ç
è
EQUATION1189 V1 EN-US
Bay control REC670
Application manual
IMinx
ö
÷
A
÷
+ ×
B k
÷
p
æ ö
i
-
C
ç ÷ ÷
è > ø
ø
in
© Copyright 2017 Hitachi Power Grids. All rights reserved
Current
IEC10000058
Section 8
Current protection
pr , tr and cr
(Equation 48)
159