NOTE
Reset the pickup values changed for the check to valid values.
Polarity Check for Voltage Input Vx
If the input Vx is used to measure a voltage for the synchronization function, the following must be
observed:
•
The 1-phase to be synchronized V
2
must be connected to input Vx;
•
The correct polarity must be checked as follows using the synchronization 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 ssynchronization 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 3-32). Thus, both voltage
transformers receive the same voltage.
•
For the synchrocheck, the program25 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
).
•
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 Section 2.20 Synchrocheck). When measuring
via a transformer, 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.
3.3.11
Mounting and Commissioning
3.3 Commissioning
490 SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
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