NOTE
Reset the pickup values changed for the check to valid values.
Polarity Check for Voltage Input V
3
Depending on the application of the voltage measuring input V
3
of a 7SJ80, a polarity check may be necessary.
If no measuring voltage is connected to this input, this section is irrelevant.
If input V
3
is used for the measurement of the displacement voltage V
N
(Power System Data 1 address 213
VT Connect. 3ph = Vab, Vbc, VGnd), the polarity is checked together with the current input Ι
N
/Ι
Ns
(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
synchronized 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 2.20 Synchrocheck.
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
(addresses 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 Functional Scope and
2.20 Synchrocheck).
•
Set address 6110 Direct CO to NO.
•
Then the circuit breaker is closed while the line isolator is open (see Figure 3-26). Thus, both voltage
transformers 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 170.0049
25 CloseRelease
).
3.3.11
Mounting and Commissioning
3.3 Commissioning
SIPROTEC 4, 7SJ80, Manual 345
E50417-G1140-C343-A8, Edition 12.2017
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