Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010
169
3.3.7 Polarity Check for Voltage Input V
3
Depending on the application of the voltage measuring input V
3
of a 7RW80, a polarity check may be neces-
sary. If no measuring voltage is connected to this input, this section is irrelevant.
If input V
3
is used for measuring the displacement voltage V
N
(Power System data 1 address 213VT
Connect. 3ph = Vab, Vbc, VGnd), the polarity is checked (see further below).
If the input V
3
is used for measuring a voltage for synchrocheck (Power System Data 1, address 213 VT
Connect. 3ph = Vab, Vbc, VSyn or Vph-g, VSyn), the following is to be observed:
• The single-phase voltage V
2
to be synchronized must be connected to input V
3
.
• The correct polarity is to be checked as follows using the synchrocheck function:
The device must provide the synchrocheck function which is to be configured in address 161 = 25 Function
1 = SYNCHROCHECK.
The voltage V
2
to be synchronized must be set correctly in address 6123 CONNECTIONof V2.
If a transformer is located between the measuring points of the reference voltage V
1
and the voltage to be syn-
chronized V
2
, its phase rotation must be taken into consideration. For this purpose, a corresponding angle is
entered in address 6122 ANGLE ADJUSTM., in the direction of the busbar seen from the feeder. An example
is shown in Section 2.7.
If necessary different transformation ratios of the transformers on the busbar and the feeder may have to be
considered under address Balancing V1/V2.
The synchrocheck function must be activated at address 6101 Synchronizing = ON.
A further aid for checking the connections are the messages 170.2090 „25 V2>V1“, 170.2091 „25 V2<V1“,
170.2094 „25 α2>α1“ and 170.2095 „25 α2<α1“ in the spontaneous messages.
• Circuit breaker is open. The feeder is de-energized. The circuit breakers of both voltage transformer circuits
must be closed.
• For the synchrocheck, the program Direct CO is set to YES (address 6110); the other programs (address-
es 6107 to 6109) are set to NO.
• Via a binary input (170.0043 „>25 Sync requ.“) a measurement request is entered. The synchrocheck
must release closing (message 170.0049, „25 CloseRelease“). If not, check all relevant parameters
again (synchrocheck configured and enabled correctly, see Sections 2.1.1 and 2.7).
• Set address 6110 Direct CO to NO.
• Then the circuit breaker is closed while the line isolator is open (see Figure 3-23). Thus, both voltage trans-
formers receive the same voltage.
• For the synchrocheck, the program 25 Function 1 is set to SYNCHROCHECK (address 161)
• Via a binary input (170.0043 „>25 Sync requ.“) a measurement request is entered. The synchrocheck
must release closing (message „25 CloseRelease“, 170.0049).
• If not, first check whether one of the aforesaid messages 170.2090 „25 V2>V1“ or 170.2091 „25 V2<V1“
or 170.2094 „25 α2>α1“ or 170.2095 „25
α2<α1“ is available in the spontaneous messages.
The message „25 V2>V1“ or „25 V2<V1“ indicates that the magnitude adaption is incorrect. Check
address 6121 Balancing V1/V2 and recalculate the adaptation factor.
The message „25 α2>α1“ or „25 α2<α1“ indicates that the phase relation of the busbar voltage does
not match the setting under address CONNECTIONof V2 (see Section2.7). When measuring via a trans-
former, address 6122 ANGLE ADJUSTM. must also be checked; this must adapt the vector group. If these
are correct, there is probably a reverse polarity of the voltage transformer terminals for V
1
.
• For the synchrocheck, the program SYNC V1>V2< is set to YES (address 6108)
• Open the VT mcb of the busbar voltage.
• Via a binary input (170.0043 „>25 Sync requ.“) a measurement request is entered. There is no close
release. If there is, the VT mcb for the busbar voltage is not allocated. Check whether this is the required
state, alternatively check the binary input „>FAIL: BUS VT“ (6510).
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