ABB REL 356

ABB REL 356 Current Differential Protection
2-11
Installation, Operation and Maintenance
For example, the functions listed below,
• DTT (closed)
• Differential Protection Disable (closed)
• Target Reset (closed)
• 52b contact (closed)
• Remaining contacts (open)
will result in the following binary pattern:
Bit Pattern 0 0 0 1 1 1 0 1
Bit Number 7 6 5 4 3 2 1 0
HEX “Value”
Field Display 1 D
For reference, refer to Table 2-2 for the binary-to-hexadecimal conversion.
Table 2-2. Binary-to-Hexadecimal Conversion
Relay Output Test
All relay outputs can be tested using the procedure described below:
(1) Open the FT switch, using the red handles of the breaker trip circuits, making sure that the following jumper
is not disturbed:
BFI/RECLOSE ENABLE
(2) Install jumper JMI in position 1-2 on the Microprocessor module.
(3) Continually depress the “DISPLAY” key until the “TEST” LED is illuminated; then depress the “FUNCTION
RAISE” or “FUNCTION LOWER” key until the words “TRIP” and “RELY” appear in the FUNCTION and
VALUE fields, respectively.
BIT NUMBER
3/7 2/6 1/5 0/4 HEX DIGIT
0000 0
0001 1
0010 2
0011 3
0100 4
0101 5
0110 6
0111 7
1000 8
1001 9
1010 A
1011 B
1100 C
1101 D
1110 E
1111 F