Signals; Settings; Operation Principle - ABB RET650 Technical Manual

Section 12
Control
12.2.9.5
12.2.9.6
12.2.10
328

Signals

Table 223: POS_EVAL Input signals
Name Type
POSITION INTEGER
Table 224: POS_EVAL Output signals
Name Type
OPENPOS BOOLEAN
CLOSEPOS BOOLEAN

Settings

The function does not have any settings available in Local HMI or Protection and
Control IED Manager (PCM600).

Operation principle

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 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 1 1/2 breaker 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 earthing switch)
• Output signals to release the HV apparatus
Default Description
0 Position status including quality
Description
Open position
Close position
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