Hitachi Relion 670 Series Applications Manual page 93

1MRK506375-UEN Rev. N
Section 7
7.1 Automatic switch onto fault logic ZCVPSOF
7.1.1 Function revision history
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7.1.2 Identification
Function description
Automatic switch onto fault logic
7.1.3 Application
Automatic switch onto fault logic, voltage- and current-based function ZCVPSOF is a complementary
function to impedance measuring functions, but may use the information from such functions.
With ZCVPSOF, a fast trip is achieved for a fault on the whole line when the line is being energized.
The ZCVPSOF tripping is generally non-directional to secure a trip at fault situations where
directional information cannot be established, for example, due to lack of polarizing voltage when a
line potential transformer is used.
Automatic activation based on dead-line detection can only be used when the voltage transformer is
situated on the line side of a circuit breaker.
When line side voltage transformers are used, the use of the nondirectional distance zones secures
switch onto fault tripping for close-in short circuits. The use of the nondirectional distance zones also
gives a fast fault clearance when energizing a bus from the line with a short circuit fault on the bus.
Other protection functions like time-delayed phase and zero-sequence overcurrent function can be
connected to ZCVPSOF to increase the dependability in the scheme.
When the voltage transformers are situated on the bus side, the automatic switch onto fault detection
based on dead-line detection is not possible. In such cases the switch onto fault logic is activated
using the binary input BC.
Railway application RER670
Application manual
Impedance protection
Product History
revision
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2.2.5 Updated technical data for setting parameters tDuration, tDLD and tOperate.
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IEC 61850
identification
ZCVPSOF
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GUID-A7F84AD6-F164-491B-B25E-D3BB002E1BDA v4
IEC 60617 ANSI/IEEE C37.2
identification device number
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Section 7
Impedance protection
SEMOD153633-1 v3
SEMOD155890-2 v4
M13830-3 v7
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