ABB REG650 Technical Manual page 282

Section 10
Secondary system supervision
276
voltage dependent function due to non simultaneous closing of the main contacts of
the miniature circuit breaker.
The input signal DISCPOS is supposed to be connected via a terminal binary input
to the N.C. auxiliary contact of the line disconnector. The DISCPOS signal sets the
output signal BLKU in order to block the voltage related functions when the line
disconnector is open. The impedance protection function does not have to be
affected since there will be no line currents that can cause malfunction of the
distance protection.
The output signals 3PH, BLKU and BLKZ as well as the signals DLD1PH and
DLD3PH from dead line detections are blocked if any of the following conditions
occur:
• The operation mode selector OpMode is set to Off
• The input BLOCK is activated
• The IED is in TEST status (TEST-ACTIVE is high) and the function has been
blocked from the HMI (BlockFUSE=Yes)
The input BLOCK is a general purpose blocking signal of the fuse failure
supervision function. It can be connected to a binary input of the IED in order to
receive a block command from external devices or can be software connected to
other internal functions of the IED. Through OR gate it can be connected to both
binary inputs and internal function outputs.
1MRK 502 034-UEN -
Technical Manual