ABB RET670 - Page 640

Application
The interlocking for bus-section disconnector (A1A2_DC, 3) function is used for one
bus-section disconnector between section 1 and 2 according to figure 253. A1A2_DC (3)
function can be used for different busbars, which includes a bus-section disconnector.
WA1 (A1) WA2 (A2)
189G
289G
A1A2_DC
en04000492_ansi.vsd
52
ANSI04000492 V1 EN
Figure 253: Switchyard layout A1A2_DC (3)
The signals from other bays connected to the module A1A2_DC are described below.
Signals in single breaker arrangement
If the busbar is divided by bus-section disconnectors, the condition no other
disconnector connected to the bus-section must be made by a project-specific logic.
The same type of module (A1A2_DC) is used for different busbars, that is, for both bus-
section disconnector A1A2_DC and B1B2_DC. But for B1B2_DC, corresponding
signals from busbar B are used.
en04000493_ansi.vsd
Section 1 Section 2
A1A2_DC(BS)
B1B2_DC(BS)
ABC_LINE
ABC_BC
ABC_LINE
(WA1)A1
(WA2)B1
(WA7)C C
B3
A3
AB_TRAFO
AB_TRAFO
A2
B2
ANSI04000493 V1 EN
Figure 254: Busbars divided by bus-section disconnectors (circuit breakers)
To derive the signals:
Signal
S1DC_OP All disconnectors on bus-section 1 are open.
S2DC_OP All disconnectors on bus-section 2 are open.
VPS1_DC The switch status of disconnectors on bus-section 1 is valid.
VPS2_DC The switch status of disconnectors on bus-section 2 is valid.
EXDU_BB No transmission error from any bay that contains the above information.
Section 3 1MRK504116-UUS C
IED application
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Application manual