Set the IDLDPU with a sufficient mar
gin below the minimum expected load current. A
safety margin of at least 15-20% is recommended. The operate value must however
exceed the maximum charging current of an overhead line, when only one phase is
disconnected (mutual coupling to the other phases).
Set the VDLDPU with a sufficient margin below the minimum expected operating
voltage. A safety margin of at least 15% is recommended.
14.3 Fuse failure supervision VDSPVC (60)
GUID-9C5BA1A7-DF2F-49D4-A13A-C6B483DDFCDC v2
14.3.1 Identification
GUID-109434B0-23E5-4053-9E6E-418530A07F9C v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Fuse failure supervision VDSPVC VTS 60
14.3.2 Application
GUID-AD63BF6C-0351-4E48-9FB2-9AB5CF0C521E v2
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.
1MRK 504 163-UUS A Section 14
Secondary system supervision
Transformer protection RET670 2.2 ANSI 673
Application manual
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