Application - ABB REC670 Applications Manual

1MRK 511 401-UEN A
13.3.2
Bay control REC670 2.2 IEC
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-US
Figure 103: Application of VDSPVC
Secondary system supervision
GUID-AD63BF6C-0351-4E48-9FB2-9AB5CF0C521E v2
L1 L2 L3
Main Vt circuit
IED
FuseFailSupvn
IEC12000143-1-en.vsd
Section 13
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