ABB RELION RET670 User Manual

100
3
2
23 
VBase
V
PUV
EQUATION1757-ANSI V4 EN-US (Equation 497)
where:
V2PU is the maximal negative sequence voltage during normal operation conditions, plus a margin of
10...20%
VBase is the base voltage for the function according to the setting GlobalBaseSel
The setting of the current limit 3I2PU is in percentage of parameter IBase. The setting
of 3I2PU must be higher than the normal unbalance current that might exist in the
system and can be calculated according to equation
498.
100
2
23 
IBase
I
PUI
EQUATION1758-ANSI V4 EN-US (Equation 498)
where:
I2 is the maximal negative sequence current during normal operating conditions, plus a margin of
10...20%
IBase is the base current for the function according to the setting GlobalBaseSel
14.2.3.4 Zero sequence based
M13683-43 v8
The IED setting value 3V0PU is given in percentage of the base voltage VBase. The
setting of 3V0PU should not be set lower than the value that is calculated according to
equation
499.
100
3
03
03 
VBase
V
PUV
EQUATION1759-ANSI V4 EN-US (Equation 499)
where:
3V0 is the maximal zero sequence voltage during normal operation conditions, plus a margin of
10...20%
VBase is the base voltage for the function according to the setting
GlobalBaseSel
The setting of the current limit 3I0PU is done in percentage of IBase. The setting of
pickup must be higher than the normal unbalance current that might exist in the
system. The setting can be calculated according to equation
500.
1MRK 504 163-UUS A Section 14
Secondary system supervision
Transformer protection RET670 2.2 ANSI 671
Application manual

ABB RELION RET670 Specifications

General

Brand	ABB
Model	RELION RET670
Category	Protection Device
Language	English