Functions
2.1 General
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
33
Rated frequency
The nominal frequency of the system is set in address
230
Rated Frequency
. The presetting according to
the ordering code (MLFB) only needs to be changed if the device is applied in a region different to the one in-
dicated when ordering. You can set
50 Hz
or
60 Hz
.
System Starpoint
For the 7VK61, the settings for the system starpoint are only relevant for the operation of the „Fuse Failure Mon-
itor“ (see also 2.7.1). Accordingly, set for address
207
SystemStarpoint
=
Solid Earthed
,
Peterson-
Coil
or
Isolated
. For („low-resistant“) earthed systems set
Solid Earthed
.
Phase Rotation
Use address
235
PHASE SEQ.
to change the default setting (
L1 L2 L3
for clockwise rotation) if your power
system has a permanent anti-clockwise phase sequence (
L1 L3 L2
).
Closing time of the circuit breaker
The circuit breaker closing time
T-CB close
at address
239
is required if the device is to close also under
asynchronous system conditions, no matter whether for manual closing, for automatic reclosing after three-pole
tripping, or both. The device will then calculate the time for the close command such that the voltages are
phase-synchronous the instant the breaker poles make contact.
Trip command duration
In address
240
the minimum trip command duration
TMin TRIP CMD
is set. It applies to all protective and
control functions which may issue a trip command. It also determines the duration of the trip pulse when a circuit
breaker test is initiated via the device. This parameter can only be altered using DIGSI under
Additional Set-
tings
.
In address
241
the maximum close command duration
TMax CLOSE CMD
is set. It applies to all close com-
mands issued by the device. It also determines the length of the close command pulse when a circuit breaker
test cycle is issued via the device. It must be long enough to ensure that the circuit breaker has securely closed.
There is no risk in setting this time too long, as the close command will in any event be terminated following a
new trip command from a protective function. This parameter can only be altered using DIGSI under
Additional
Settings
.
Circuit breaker test
7VK61 allows a circuit breaker test during operation by means of a tripping and a closing command entered on
the front panel or using DIGSI. The duration of the trip command is set as explained above. Address
242
T-
CBtest-dead
determines the duration from the end of the trip command until the start of the close command
for this test. It should not be less than 0.1 s.
Summary of Contents for Siprotec 7VK61
Page 8: ...Preface SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 8 ...
Page 14: ...Contents SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 14 ...
Page 316: ...Literature SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 316 ...
Page 328: ...Glossary SIPROTEC 7VK61 Manual C53000 G1176 C159 3 Release date 05 2009 328 ...