Siemens siprotec 7SD5 User Manual page 500

3 Mounting and Commissioning
• If not, first check whether one of the before named messages 2947 „Sync.
• The program Usync< U-line> = YES (address 3517) and SYNC-CHECK = YES
• Open the VT mcb of the busbar voltage.
• Via binary input (No. 2906 „>Sync. Start AR") initiate the measuring request.
• The VT mcb of the busbar voltage is to be closed again.
• Open the circuit breaker.
• The program Usync> U-line< = YES (address 3516) and Usync> U-line< =
• Via binary input (No. 2906„>Sync. Start AR") initiate the measuring request.
• Open the VT mcb of the feeder voltage.
• Via binary input (No. 2906 „>Sync. Start AR") initiate the measuring request.
• Open the VT mcb of the feeder voltage again.
Addresses 3515 to 3519 must be restored as they were changed for the test. If the
allocation of the LEDs or signal relays was changed for the test, this must also be re-
stored.
Polarity Check for If the standard connection of the device is used whereby current input I
in the starpoint of the set of current transformers (refer also to the connection circuit
the Current Mea-
diagram in the Appendix A.3), then the correct polarity of the earth current path in
suring Input I
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general automatically results.
If, however, the current I
rection check with this current is necessary.
If the device is provided with the sensitive current input I
isolated or resonant-earthed system, the polarity check for I
with the earth fault check according to the previous section. Then this section can be
ignored.
Otherwise the test is carried out with a disconnected trip circuit and primary load cur-
rent. It must be noted that during all simulations that do not exactly correspond with
situations that may occur in practice, the non-symmetry of measured values may
cause the measured value monitoring to pickup. This must therefore be ignored during
such tests.
500
Udiff>" or 2949 „Sync. ϕ-diff>" is available in the spontaneous messages.
The message „Sync. Udiff>" indicates that the magnitude (ratio) adaptation is
incorrect. Check address 215 U-line / Usync and recalculate the adaptation
factor, if necessary.
The message „Sync. ϕ-diff>" indicates that the phase relation of the busbar
voltage does not match the setting under address 212 Usync connect. (see
Section 2.1.2.1). When measuring across a transformer, address 214 ϕ Usync-
Uline must also be checked; this must adapt the vector group (see Section
2.1.2.1). If these are correct, there is probably a reverse polarity of the voltage
transformer terminals for Ubus.
(address 3515) is set for synchronism check.
There is no close release. If there is, the VT mcb for the busbar voltage is not allo-
cated. Check whether this is the required state, alternatively check the binary input
„>FAIL:Bus VT" (No.362).
NO (address 3517) is set for synchronism check.
The synchronism check must release closing (message „Sync. release", No.
2951). If not, check all voltage connections and the corresponding parameters
again carefully as described in Section 2.1.2.1.
No close release is given.
is derived from a separate summation CT an additional di-
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is connected
4
and it is connected to an
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was already carried out
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7SD5 Manual
C53000-G1176-C169-1