ABB REC670 Applications Manual page 194

Section 8
Current protection
188
Operate time
tx
txMin
IMinx
IEC10000058 V2 EN-US
Figure 77: 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
pr, tr and cr must be given.
1MRK 511 401-UUS A
Current
IEC10000058
Bay control REC670 2.2 ANSI
Application manual