Application - ABB REG670 Applications Manual

1MRK 502 071-UEN -
14.3.2
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual

Application

Some protection functions operate on the basis of measured voltage at the relay point.
Examples of such protection functions are distance protection function, undervoltage
function and energisation-check function. These functions might mal-operate if there
is an incorrect measured voltage due to fuse failure or other kind of faults in voltage
measurement circuit.
VDSPVC is designed to detect fuse failures or faults in voltage measurement circuit
based on comparison of the voltages of the main and pilot fused circuits phase wise.
VDSPVC output can be configured to block voltage dependent protection functions
such as high-speed distance protection, undervoltage relays, underimpedance relays
and so on.
IEC12000143 V1 EN
Figure 222: Application of VDSPVC
Secondary system supervision
L1 L2 L3
Main Vt circuit
IED
FuseFailSupvn
IEC12000143-1-en.vsd
Section 14
477