14.2
Interlocking (3)
IP15572-1 v2
14.2.1
Functionality
M15106-3 v7
The interlocking functionality 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.
Each control IED has interlocking functions for different switchyard arrangements, each handling
the interlocking of one bay. The interlocking functionality in each IED is not dependent on any
central function. For the station-wide interlocking, the IEDs communicate via the station bus or by
using hard wired binary inputs/outputs.
The interlocking conditions depend on the circuit configuration and status of the system at any
given time.
14.2.2
Operation principle
M13528-4 v6
The interlocking function consists of software modules located in each control IED. The function is
distributed and not dependent on any central function. Communication between modules in
different bays is performed via the station bus.
The reservation function (see section
) is used to ensure that HV apparatuses that
might affect the interlock are blocked during the time gap, which arises between position
updates. This can be done by means of the communication system, reserving all HV apparatuses
that might influence the interlocking condition of the intended operation. The reservation is
maintained until the operation is performed.
After the selection and reservation of an apparatus, the function has complete data on the status
of all apparatuses in the switchyard that are affected by the selection. Other operators cannot
interfere with the reserved apparatus or the status of switching devices that may affect it.
The open or closed positions of the HV apparatuses are inputs to software modules distributed in
the control IEDs. Each module contains the interlocking logic for a bay. The interlocking logic in a
module is different, depending on the bay function and the switchyard arrangements, that is,
double-breaker or breaker-and-a-half bays have different modules. Specific interlocking
conditions and connections between standard interlocking modules are performed with an
engineering tool. Bay-level interlocking signals can include the following kind of information:
•
Positions of HV apparatuses (sometimes per phase)
•
Valid positions (if evaluated in the control module)
•
External release (to add special conditions for release)
•
Line voltage (to block operation of line grounding switch)
•
Output signals to release the HV apparatus
The interlocking module is connected to the surrounding functions within a bay as shown in figure
.
1MRK 502 066-UUS B
Section 14
Control
765
Technical manual
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