• Substitution of position and quality indications
• Overriding of interlocking functions
• Overriding of synchrocheck
• Operation counter
• Suppression of mid position
Two types of command models can be used:
• Direct with normal security
• SBO (Select-Before-Operate) with enhanced security
Normal security means that only the command is evaluated
and the resulting position is not supervised. Enhanced
security means that the command is evaluated with an
additional supervision of the status value of the control
object. The command sequence with enhanced security is
always terminated by a CommandTermination service
primitive and an AddCause telling if the command was
successful or if something went wrong.
Control operation can be performed from the local HMI with
authority control if so defined.
M16909-3 v3
Features of the apparatus control function are:
• Operation of primary apparatuses
• Select-Execute principle to give high reliability
• Selection and reservation function to prevent
simultaneous operation
• Selection and supervision of operator place
• Command supervision
• Block/deblock of operation
• Block/deblock of updating of position indications
• Substitution of position indications
• Overriding of interlocking functions
• Overriding of synchrocheck
• Pole discordance supervision
• Operation counter
The apparatus control function is realized by means of a
number of function blocks designated:
• Bay control QCBAY
• Switch controller SCSWI
• Circuit breaker SXCBR
• Circuit switch SXSWI
The three latter functions are logical nodes according to IEC
61850-8-1. To realize the reservation function also the
function blocks Reservation input (RESIN) and Bay reserve
(QCRSV) are included in the apparatus control function.
Interlocking
M13531-3 v4
The interlocking function blocks the possibility to operate
primary switching devices, for instance when a disconnector
is under load, in order to prevent material damage and/or
accidental human injury.
Each apparatus control function has interlocking modules
included for different switchyard arrangements, where each
function handles interlocking of one bay. The interlocking
function is distributed to each IED and is not dependent on
any central function. For the station-wide interlocking, the
IEDs communicate via the system-wide interbay bus (IEC
61850-8-1) or by using hard wired binary inputs/outputs. The
interlocking conditions depend on the circuit configuration
and apparatus position status at any given time.
For easy and safe implementation of the interlocking function,
the IED 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.
The following interlocking modules are available:
• Line for double and transfer busbars, ABC_LINE
• Bus coupler for double and transfer busbars, ABC_BC
• Transformer bay for double busbars, AB_TRAFO
• Bus-section breaker for double busbars, A1A2_BS
• Bus-section disconnector for double busbars, A1A2_DC
• Busbar earthing switch, BB_ES
• Double CB Bay, DB_BUS_A, DB_LINE, DB_BUS_B
• 1 1/2-CB diameter, BH_LINE_A, BH_CONN, BH_LINE_B
Switch controller SCSWI
M13486-3 v8
The Switch controller (SCSWI) initializes and supervises all
functions to properly select and operate switching primary
apparatuses. The Switch controller may handle and operate
on one multi-phase device or up to three one-phase devices.
Circuit breaker SXCBR
M13489-3 v6
The purpose of Circuit breaker (SXCBR) is to provide the
actual status of positions and to perform the control
operations, that is, pass all the commands to primary
apparatuses in the form of circuit breakers via binary output
boards and to supervise the switching operation and position.
Circuit switch SXSWI
M16492-3 v6
The purpose of Circuit switch (SXSWI) function is to provide
the actual status of positions and to perform the control
operations, that is, pass all the commands to primary
apparatuses in the form of disconnectors or earthing switches
via binary output boards and to supervise the switching
operation and position.
Reservation function QCRSV
M13506-3 v4
The purpose of the reservation function is primarily to transfer
interlocking information between IEDs in a safe way and to
prevent double operation in a bay, switchyard part, or
complete substation.
1MRK 511 404-BEN A
Product version: 2.2.1
26 ABB
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