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Revision: Issued: November 2002
Data subject to change without notice
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• Interlocking function available for a
breaker-and-a-half diameter
• Easy to adapt to customer’s specific
requirements
• Preconfigured and tested interlocking function block
• Distributed solution, no central function
The interlocking function blocks the possibility to operate high voltage switching devices,
for instance when a disconnector is under
load, in order to prevent material damage
and/or accidental human injury.
control terminals communicate via the system-wide interbay bus or by using hardwired
binary inputs/outputs.
The interlocking conditions depend on the
circuit configuration and status of the installation at any given time.
Each control terminal has interlocking functions for different switchyard arrangements,
each handling interlocking of one bay. The
function is distributed to each control terminal and not dependent on any central function. For the station-wide interlocking, the
The interlocking modules BH_LINE_A,
BH_CONN and BH_LINE_B are used for
lines connected to a breaker-and-a-half diameter according to figure 1.
A (BB1)
B (BB2)
Q1
Q2
Q51
Q51
Q0
Q0
Q52
BH_LINE_A
Q52
Q6
Q6
Q53
Q53
Q61
Q0
Q51
Q9
BH_LINE_B
Q62
Q52
Q9
Q8
Q8
BH_CONN
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Figure 1:
Switchyard layout breaker-and-a-half
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1MRK 580 161-BEN
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For easy and safe implementation of the
interlocking function, the control terminal is
delivered with standardized and tested software interlocking modules containing logic
for the interlocking conditions. The interlocking conditions can be altered, to meet the customer’s specific requirements, by adding
configurable logic by means of the graphical
configuration tool CAP 531.
The input signals EXDU_xxx shall be set to
true if there is no transmission error at transfer of information from another bay. The signal is generated from the data valid output in
the command function block, that receives
the transferred information.
The inputs QxEXy are used for delivery specific conditions to be added to the standard
modules if required.
Required signals with designations ended
with TR are intended to be transferred to
other bays.
Two types of interlocking modules per diameter are defined. BH_LINE_A/B is the connection from one line to the busbar and is
used twice per diameter. BH_CONN is the
connection between the two lines of the
diameter. The figure “Switchyard layout
breaker-and-a-half” shows the designations
of the apparatuses that can be dealt with by
these modules.
The input signals EXVVA_xx are always set
to true, because the interlocking software is
always running in our applications.
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Signal is 1 if Q1 is open
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Signal is 1 if Q51 is open
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Signal is 1 if Q61 in module BH_CONN is closed
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Signal is 1 if Q51 in module BH_CONN is open
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Signal is 1 if Q51 in module BH_CONN is closed
CQ52_OP
Signal is 1 if Q52 in module BH_CONN is open
CQ52_CL
Signal is 1 if Q52 in module BH_CONN is closed
Q15_OP
Signal is 1 if earthing switch Q15 on busbar A is open
Q15_CL
Signal is 1 if earthing switch Q15 on busbar A is closed
VOLT_OP
There is no voltage on the line and not fuse failure
VOLT_CL
There is voltage on the line or there is a VT (fuse) failure
EXDUP_ES
Signal is 1 if there is no transmission error from any bay containing earthing switches Q15
EXVVA_ES
Signal is 1 if the interlocking programs in all bays containing
earthing switches Q15 are running
Q6EX1
Input for an external condition for apparatus Q6
Q6EX2
Input for an external condition for apparatus Q6
Q1EX1
Input for an external condition for apparatus Q1
Q1EX2
Input for an external condition for apparatus Q1
Q9EX1
Input for an external condition for apparatus Q9
Q9EX2
Input for an external condition for apparatus Q9
Q9EX3
Input for an external condition for apparatus Q9
Q9EX4
Input for an external condition for apparatus Q9
Q9EX5
Input for an external condition for apparatus Q9
Q9EX6
Input for an external condition for apparatus Q9
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Input for an external condition for apparatus Q9
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Switching of Q1 is allowed
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Switching of Q51 is allowed
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Switching of Q52 is allowed
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Switching of Q52 is forbidden
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Switching of Q53 is allowed
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Switching of Q53 is forbidden
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Signal is 1 if Q62 is open
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Signal is 1 if Q51 is open
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Signal is 1 if Q51 is closed
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Signal is 1 if Q52 is open
Q52_CL
Signal is 1 if Q52 is closed
1Q53_OP
Signal is 1 if Q53 on line 1 is open
1Q53_CL
Signal is 1 if Q53 on line 1 is closed
2Q53_OP
Signal is 1 if Q53 on line 2 is open
2Q53_CL
Signal is 1 if Q53 on line 2 is closed
Q61EX1
Input for an external condition for apparatus Q61
Q61EX2
Input for an external condition for apparatus Q61
Q62EX1
Input for an external condition for apparatus Q62
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Input for an external condition for apparatus Q62
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Switching of Q52 is forbidden
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Switching of Q52 is allowed
Q61ITL
Switching of Q61 is forbidden
Q61REL
Switching of Q61 is allowed
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Switching of Q62 is forbidden
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Switching of Q62 is allowed
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Signal is 1 if Q2 is open
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Signal is 1 if Q2 is closed
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Signal is 1 if Q51 is open
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Signal is 1 if Q51 is closed
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Signal is 1 if Q52 is open
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Signal is 1 if Q52 is closed
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Signal is 1 if Q53 is open
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Signal is 1 if Q53 is closed
Q9_OP
Signal is 1 if Q9 is open
Q9_CL
Signal is 1 if Q9 is closed
Q8_OP
Signal is 1 if Q8 is open
Q8_CL
Signal is 1 if Q8 is closed
CQ0_OP
Signal is 1 if Q0 in module BH_CONN is open
CQ0_CL
Signal is 1 if Q0 in module BH_CONN is closed
CQ62_OP
Signal is 1 if Q62 in module BH_CONN is open
CQ62_CL
Signal is 1 if Q62 in module BH_CONN is closed
CQ51_OP
Signal is 1 if Q51 in module BH_CONN is open
CQ51_CL
Signal is 1 if Q51 in module BH_CONN is closed
CQ52_OP
Signal is 1 if Q52 in module BH_CONN is open
CQ52_CL
Signal is 1 if Q52 in module BH_CONN is closed
Q25_OP
Signal is 1 if earthing switch Q25 on busbar B is open
Q25_CL
Signal is 1 if earthing switch Q25 on busbar B is closed
VOLT_OP
There is no voltage on the line and not fuse failure
VOLT_CL
There is voltage on the line or there is a VT (fuse) failure
EXDUP_ES
Signal is 1 if there is no transmission error from any bay containing earthing switches Q25
EXVVA_ES
Signal is 1 if the interlocking programs in all bays containing
earthing switches Q25 are running
Q6EX1
Input for an external condition for apparatus Q6
Q6EX2
Input for an external condition for apparatus Q6
Q2EX1
Input for an external condition for apparatus Q2
Q2EX2
Input for an external condition for apparatus Q2
Q9EX1
Input for an external condition for apparatus Q9
Q9EX2
Input for an external condition for apparatus Q9
Q9EX3
Input for an external condition for apparatus Q9
Q9EX4
Input for an external condition for apparatus Q9
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Input for an external condition for apparatus Q9
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Input for an external condition for apparatus Q9
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Input for an external condition for apparatus Q9
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Switching of Q2 is allowed
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Switching of Q2 is forbidden
Q51REL
Switching of Q51 is allowed
Q51ITL
Switching of Q51 is forbidden
Q52REL
Switching of Q52 is allowed
Q52ITL
Switching of Q52 is forbidden
Q53REL
Switching of Q53 is allowed
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Switching of Q53 is forbidden
Q9REL
Switching of Q9 is allowed
Q9ITL
Switching of Q9 is forbidden
Q8REL
Switching of Q8 is allowed
Q8ITL
Switching of Q8 is forbidden
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Signal is 1 if Q2 is open
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Signal is 1 if Q2 is closed
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Switch status of Q2 is valid (open or closed)
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Control & Force Measurement
Substation Automation
SE-721 59 Västerås
Sweden
Tel: +46 (0) 21 34 20 00
Fax: +46 (0) 21 14 69 18