Settings - Siemens SIPROTEC 4 7VK61 Manual

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If the input Ι
Address 220 I4 transformer = Not connected,
Address 221 I4/Iph CT is then irrelevant.
In this case, the neutral current is calculated from the sum of the phase currents.
Rated frequency
The rated frequency of the power system is set at address 230 Rated Frequency. The factory presetting
according to the ordering code (MLFB) only needs to be changed if the device is applied in a region different
from the one indicated when ordering. You can set 50 Hz or 60 Hz
System Starpoint
The manner in which the system starpoint is earthed must be considered for the correct processing of earth
faults and double earth faults. Accordingly, set for address 207 SystemStarpoint = Solid Earthed,
Peterson-Coil or Isolated. For low-resistant earthed systems set Solid Earthed.
Phase Sequence
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 3-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 protection 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 in DIGSI at Display Additional

Settings.

In address 241 the maximum close command duration TMax CLOSE CMD is set. It applies to all close
commands 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 termi-
nated following a new trip command from a protection function. This parameter can only be altered in DIGSI
at Display Additional Settings.
Circuit breaker test
7VK61 allows a circuit-breaker test during operation using a trip-and-close command entered on the front
panel or from 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.
Settings
2.1.3.2
Addresses which have an appended "A" can only be changed with DIGSI, under "Additional Settings".
SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
is not required, set:
4
Functions
2.1 General
35