ABB RELION 670 Series Applications Manual page 568

Transformer protection

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These signals from each line bay (ABC_LINE), each transformer bay (AB_TRAFO), and each bus-

coupler bay (ABC_BC) are needed:

These signals from each bus-section disconnector bay (A1A2_DC) are also needed. For

B1B2_DC, corresponding signals from busbar B are used. The same type of module (A1A2_DC)

is used for different busbars, that is, for both bus-section disconnectors A1A2_DC and

If no bus-section disconnector exists, the signal DCOPTR, VPDCTR and EXDU_DC are set to 1

If the busbar is divided by bus-section circuit breakers, the signals from the bus-section

coupler bay (A1A2_BS) rather than the bus-section disconnector bay (A1A2_DC) must be used.

For B1B2_BS, corresponding signals from busbar B are used. The same type of module

(A1A2_BS) is used for different busbars, that is, for both bus-section circuit breakers A1A2_BS

and B1B2_BS.

For a busbar earthing switch, these conditions from the A1 busbar section are valid:

QB1 is open.

QB2 is open (AB_TRAFO, ABC_LINE)

QB2 and QB20 are open (ABC_BC)

QB7 is open.

The switch status of QB1 is valid.

The switch status of QB2 is valid.

The switch status of QB2and QB20 is valid.

The switch status of QB7 is valid.

No transmission error from the bay that contains the above information.

The bus-section disconnector is open.

The switch status of bus-section disconnector DC is valid.

No transmission error from the bay that contains the above information.

QB1 is open.

QB2 is open.

The switch status of QB1 is valid.

The switch status of QB2 is valid.

No transmission error from the bay BS (bus-section coupler bay) that contains

the above information.

1MRK 504 152-UEN B

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