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AB
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2006-03-30 Substation Automation Products Training
Substation Automation Products
Training
Control IED REC 670 Interlocking
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Contents Purpose and features Basic principles Interaction between bays Reservation method Function blocks
Different switchyard arrangements SCILO POS_EVAL
Implementation example Exercise
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Interlocking
Distributed functionality, not depending on a central function Standardized and well-proven software modules for easy and
safe implementation Information exchange over the station bus, which means
minimizing of cabling between IEDs Interlocking conditions depend on the circuit configuration
and apparatus position status at any given time
The features are:
To avoid dangerous or damaging switchgear operations and to assure personnel safety
The purpose of the interlocking function is:
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Disconnectors shall not be opened or closed on-load
Earthing switches shall not be closed onto voltage
CB:s shall not be closed when surrounding disconnectors are in intermediate positions
CB opening is only interlocked at a bus-coupler bay, if a busbar transfer is in progress
Interlocking Basic principles
The interlocking modules are based on these basic principles:
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Data exchange example between bays
Disc QB1 and QB2 closed
WA1 not earthedWA2 not earthedWA1 and WA2 interconn
Disc QB1 and QB2 closed
WA1 not earthedWA2 not earthedWA1 and WA2 interconn . . . . .
Station bus
QB1
WA1
WA2
Bay 1 Bay n Bus couplerWA1 unearthedWA1 unearthed
WA1 and WA2 interconn
WA1 and WA2 interconn in other bay
Interlocking
QB2
QA1
QB9
QB1 QB2
QA1
QB9
QB2QB1
QA1
QC1 QC2
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Interlockingmodule
Interlockingmodules inother bays
Apparatus controlmodules
SCSWI SXSWISCILO
Apparatus controlmodules
Apparatus controlmodules
Interlocking module on bay level
SCSWI SXCBRSCILO
SCSWI SXSWISCILO
Interlocking Interaction between modules
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Interlocking Reservation method
Station bus
Station HSI
GW
CloseDisconnector
OpenBreaker
Control center
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Interlocking modules
Function block ABC_LINE Line bay in arrangements
with single, double, and bypass busbars
Function block ABC_BC Bus coupler in arrangements
with single, double, and bypass busbars
QB1 QB2
QC1
QA1
QC2
QB9QC9
WA1 (A)
WA2 (B)
WA7 (C)
QB7
QB1 QB2
QC1
QA1
WA1 (A)
WA2 (B)
WA7 (C)
QB7QB20
QC2
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Interlocking modules
Function block AB_TRAFO Transformer bay in
arrangements with single and double busbar
QC
Function block BB_ES Busbar earthing switch on
any busbar part
QB1 QB2QC1
QA1
QC2
WA1 (A)
WA2 (B)
QA2
QC3
T
QC4
QB4QB3
QA2 and QC4 are notused in this interlocking
AB_TRAFO
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Interlocking modules
Function block A1A2_BS Bus section coupler between bus
sections A1 and A2
Function block A1A2_DC Bus section disconnector between
bus sections A1 and A2
QA1
WA1 (A1)
QB2
QC4
QB1
QC3
WA2 (A2)
WA1 (A1) WA2 (A2)QB
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Interlocking modules
Function blocksDB_BUS_A, DB_BUS_B Bus links of a double
breaker bay
DB_LINE Line connection of a
double breaker bay
WA1 (A)
WA2 (B)
QB1QC1
QA1
QC2
QC9
QB61
QB9
QB2QC4
QA2
QC5
QC3
QB62
DB_BUS_B
DB_LINE
DB_BUS_A
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Interlocking modules
Function blocksBH_LINE_A, BH_LINE_B Line connections of a
breaker and a half diameter
BH_CONN Connection between two
lines of a breaker and a half diameter
WA1 (A)
WA2 (B)
QB1QC1
QA1
QC2
QC9
QB6
QB9
QB2QC1
QA1
QC2
QC3
QB6
QC3
QB62QB61 QA1
QC1 QC2
QC9
QB9
BH_LINE_A BH_LINE_B
BH_CONN
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Interlocking SCILO
Open/close position of switch device
Open/close operation from interlocking logic is enabled
Open/close operation at closed/open or intermediate or bad position is enabled
SCILOCI01-
POSOPENPOSCLOSEOPEN_ENCLOSE_EN
EN_OPENEN_CLOSE
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Interlocking SCILO logic
OPEN_EN
POSOPENPOSCLOSE 1 EN_OPEN
EN_CLOSECLOSE_EN
SCILO=1
&
>1
>1
&
&
&
en04000525.vsd
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Interlocking Interaction with apparatus control function
POS_EVALPE01-
POSITION OPENPOSCLOSEPOS
SCILOCI01-
POSOPENPOSCLOSEOPEN_ENCLOSE_EN
EN_OPENEN_CLOSE
SCSWICS01-
BLOCKPSTOL_SELL_OPENL_CLOSEAU_OPENAU_CLOSEBL_CMDRES_GRTRES_EXTSY_INPROSYNC_OKEN_OPENEN_CLOSEXPOS1XPOS2XPOS3
EXE_OPEXE_CL
SELECTEDRES_RQ
START_SYPOSITIONOPENPOS
CLOSEPOSPOLEDISCCMD_BLKL_CAUSE
XOUT
Frominterlockingmodule
SXCBR/SXSWIXC01-/XS01-
BLOCKLR_SWIOPENCLOSEBL_OPENBL_CLOSEBL_UPDPOSOPENPOSCLOSETR_OPENTR_CLOSERS_CNTXIN
EXE_OPEXE_CL
SUBSTEDOP_BLKDCL_BLKD
UPD_BLKD
OPENPOSCLOSEPOS
TR_POSCNT_VALL_CAUSE
XPOS
Tointerlockingmodule
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Interlocking POS_EVAL
POS_EVALPE01-
POSITION OPENPOSCLOSEPOS
Open/close position of switch device
Position including quality
POSITION Quality OPENPOS CLOSEPOS0 0 0 00 1 0 01 0 0 11 1 0 02 0 1 02 1 0 03 0 0 03 1 0 0
Truth table:
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Interlocking Implementation example for an AB-arrangement
QA1_OPQA1_CLQB9_OPQB9_CLQB1_OPQB1_CLQB2_OPQB2_CLQB7_OPQB7_CLQC1_OPQC1_CLQC2_OPQC2_CLQC9_OPQC9_CLQC11_OPQC11_CLQC21_OPQC21_CLQC71_OPQC71_CLBB7_D_OPBC_12_CLBC_17_OPBC_17_CLBC_27_OPBC_27_CLVOLT_OFFVOLT_ONVP_BB7_DVP_BC_12VP_BC_17VP_BC_27EXDU_ESEXDU_BPBEXDU_BCQB9_EX1QB9_EX2QB1_EX1QB1_EX2QB1_EX3QB2_EX1QB2_EX2QB2_EX3QB7_EX1QB7_EX2QB7_EX3QB7_EX4
QA1CLRELQA1CLITL
QB9RELQB9ITL
QB1RELQB1ITL
QB2RELQB2ITL
QB7RELQB7ITL
QC1RELQC1ITL
QC2RELQC2ITL
QC9RELQC9ITL
QB1OPTRQB1CLTRQB2OPTRQB2CLTRQB7OPTRQB7CLTR
QB12OPTRQB12CLTRVPQB1TRVPQB2TRVPQB7TR
VPQB12TR
ABC_LINE
BB_DC_OP
VP_BB_DC
BB_ES
BB_DC_OP
VP_BB_DC
BB_ES
BBTR_OP
VP_BBTR
ABC_BC
ABC_BC
BC12CLTR
VPBC12TR
To apparatus control moduleSCSWI via SCILO for own bay
To earthing switchfor busbar 1 (A)
To earthing switchfor busbar 2 (B)
To bus-coupler bay
VPX = 1 if status of X is valid
EXDU_X = 1 if no transmission error from bay Y
BBESOPTRBBESCLTR
BB_ES
BBESOPTRBBESCLTR
BB_ES
Position indicationsfrom own bay via function blockPOS_EVAL or BI
”1””0”
”1””0”
”1””0”
No transmission error from bus earthing switchesNo transmission error from bus-coupler bay
User-specificconditionsNot used = “1”
Earthing switchfor busbar 1 (A)
Earthing switchfor busbar 2 (B)
From bus-coupler bay
No line voltageand no fuse failure
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Exercise time…
Exercise 4
Interlocking engineering