ABB RET670 Commissioning Manual

Table 20: Test points for phase-to-ground loop CG (Ohm/loop)
Test point Reach Value Comments
1 X [X1+XN] XN=(X
0
-X
1
)/3
R 0
2 X 0
R RLdFwd When RLdFWd < RFltFwPG
R RFltFwPG When RLdFwdPG > RFltFwPG
3 X 0.85·[X1+XN] R≈0.491·(X1+XN)+RFltFwdPG
R
4 X
0.85·[X1+XN]
Can be limited by RFltFwPG
R -0.85·[X1+XN]·
tan (AngNegRes-90°)
5 X RFltFwdPG·tan (LdAngle) Only when RLdFwd < RFltFwPG
R RFltFwdPG
6 X -0,5·RLdFwd·tan (ArgDir)
R 0,5·RLdFwd
Table 20 is used together with figure 25.
X1
R
X
85%
1
3
5
2
6
4
50% RLdFwd
ArgNegRes
0.5·RFltFwdPP
LdAngle
ANSI09000735-1-en.vsd
ArgDir
60°
)/( phaseW
)/( phaseW
7
ANSI09000735 V1 EN
Figure 26: Operating characteristic for phase selection function, forward direction
phase-to-phase faults
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 119
Commissioning manual

ABB RET670 Specifications

General

Rated Frequency	50/60 Hz
Inputs	Analog and binary inputs
Application	Protection of power systems
Communication Protocols	IEC 61850, DNP3, Modbus
Operating Temperature Range	-25°C to +55°C
Mounting	Rack mounted
Number of Binary Inputs	Up to 48
Number of Binary Outputs	32
Protection Functions	Overcurrent Protection
Outputs	Binary outputs
Enclosure	IP 54
Type	Line Differential Protection
Number of Analog Inputs	24