ABB REL 356

ABB REL 356 Current Differential Protection
5-2
Testing
Using the procedure described in Section 2 “Metering Mode”, read the following parameters:
VAG = 70 (VOLTS)
ÐVAG = 0 (DEG.)
VBG = 70 (VOLTS)
ÐVBG = -120 (DEG.)
VCG = 70 (VOLTS)
ÐVCG = +120 (DEG.)
IA = 10.0 (AMPS)
ÐIA = -45 (DEG.)
IB = 10.0 (AMPS)
ÐIB = -165 (DEG.)
IC = 10.0 (AMPS)
ÐIC = +75 (DEG.)
Verify all metered values to be ± 5% on magnitude and ± 2 degrees on phase angle.
The metering accuracy is ±5 % or 0.1 A secondary current, whichever is the greatest. When reading off currents in
primary values, the 0.1 A step error is multiplied by the CT ratio, CTR.
Contact Input Subsystem Test
Make sure that the input voltage selection jumpers on the contact input module correspond to the desired contact
“wetting” voltage, as specified in Section 2 “Contact Input Module”.
Apply the rated voltage across the terminals shown in the table below:
Using procedure described in Section 2 “Contact Input Test”,
verify proper response of the front panel display to contact input status changes.
V (volts) / Angle I (amps) / Angle
V
a
=70 Ð 0 °
V
b
=70 Ð -120 °
V
c
=70 Ð +120 °
I
a
=10 Ð -45 °
I
b
=10 Ð -165 °
I
c
=10 Ð +75 °
Description
Terminal
Block
Terminal
+-
HEX
Digit
DTT Key
STUB BUS
Diff Protection Disable
Target RESET
52b
TB5
TB5
TB5
TB5
TB5
TB5
TB5
910
11 12
13 14
78
12
34
56
1
2
4
8
10
20
40