Basler BE1-51C, Instruction Manual

Page: 9 / 66

BE1-51C General Information
1-3
neutral flag xxxx xxxx
|||| ||||--neutral function active
|||| |||----50g function active
|||| ||-----51g function active
|||| |-------affected output (0 = normal = TIMED and INST1, 1 = INST2)
Following are examples of the internal flags. When the setting is handled from the front panel, these flags
are not available to the user. When the setting is from the computer, these flags are needed.
Partial list of examples (function 07 is identical to units version 1.5 and previous).
FLAG DESCRIPTION
0000 xxx0 Neutral function selectivity completely disabled (same functionality as 07h)
0000 0011=03h Neutral function enabled for 50 element
Neutral function disabled for 51 element
Functions incorporated into existing output relays (51, INST1)
0000 0101=05h Neutral function enabled for 51 element
Neutral function disabled for 50 element
Functions incorporated into existing output relays (51, INST1)
0000 0111=07h 50g and 51g both enabled
Neutral functions incorporated with phase functions (51, INST1)
This is how BE1-51C/SCOR version 1.5 and previous functioned.
0000 1011=0bh Neutral function disabled for 51 element
Neutral function enabled for 50 element
Functions removed from existing output relays and grouped into INST2
output relay
0000 1101=0dh Neutral function enabled for 51 element
Neutral function disabled for 50 element
Functions removed from existing output relays and grouped into INST2
output relay
0000 1111=0fh Neutral function enabled for 51 element
Neutral function enabled for 50 element
Functions removed from existing output relays and grouped into INST2
output relay
BREAKER FAILURE
This standard feature invokes a breaker failure function within the relay. If enabled (reg 68=01) the function
occurs as follows.
The breaker failure function involves a 1 second timer. When a trip occurs, the timer starts. At timeout, two
checks are made: one, that the breaker properly changed state, and two, that the current is below approx
10% of the tap value. If the results of either check is not correct, then a breaker failure has occurred.