ABB SA-1 Instruction Leaflet page 5

Type SA-1
Generator Differential Relay
PRIMARY
CIRCUIT CURRENT
0.14A
Operating (0.5A)
0.14A
(0.5)
Sensing
(Operating)
30.0A
5.0A
Restraint
5.0A
Sensing
(Restraint)
60.0A
Amplifier
Minimum
Trip
Current
+5%
(Values in Parenthesis Represent Desensitized SA-1)
PHASE TERMINAL
1 2 - 7
2 3 - 6
3 4 - 5
Any + to -
phase 23 - 26
24 - 26
24 - 8
8 - 25
25 - 26
Any + to -
phase 24 - 26
1 18 - 13
2 17 - 14
3 15 - 16
Any + to -
phase 25 - 26
25 - 8
8 - 24
24 - 26
Any + to -
phase 25 - 26
+ to -
0 27 - 8
12 - 8
10 - 8
Any + to -
phase 27 - 8
12 - 8
21 - 8
Table 1:
CHECKPOINTS (Typical Value)
VALUE
2.5 ac Input to operate rectifier
2.5 ac Input to operate rectifier
2.5 ac Input to operate rectifier
2.1 dc Output to rectifier
1.85 dc a. Output to operating sensing circuit
0.55 dc b. Input to amplifier
0.65 dc c.
0.65 dc d. Output to restraint sensing circuit
Ref.: a = b + c + d
51.0 dc
6.0 ac Input to restraint rectifier
6.0 ac Input to restraint rectifier
6.0 ac Input to restraint rectifier
2.1 dc a. Output of restraint sensing circuit
1.2 dc b.
0.6 dc c. Input to amplifier
0.3 dc d. Output to operating sensing circuit
Ref.: a = b + c + d
42.0 dc
0.7 dc
24.0 dc
24.0 dc
0.5 dc
24.0 dc
10.0 dc
41-348.1H
FUNCTION
5