ABB Relion 670 Series Product Manual page 33

Line differential protection RED670 2.0
Product version: 2.0
Up to five three-phase reclosing attempts can be included by
parameter setting. The first attempt can be single-, two and/or
three phase for single phase or multi-phase faults respectively.
Multiple autoreclosing functions are provided for multi-breaker
arrangements. A priority circuit allows one circuit breaker to
close first and the second will only close if the fault proved to be
transient.
Each autoreclosing function is configured to co-operate with
the synchrocheck function.
The autoreclosing function provides high-speed and/or delayed
three pole autoreclosing.
Apparatus control APC
The apparatus control functions are used for control and
supervision of circuit breakers, disconnectors and earthing
switches within a bay. Permission to operate is given after
evaluation of conditions from other functions such as
interlocking, synchrocheck, operator place selection and
external or internal blockings.
Apparatus control features:
• Select-Execute principle to give high reliability
• Selection 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 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.
Interlocking
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.
ABB
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.
Switch controller SCSWI
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 three-phase device or up to three one-phase devices.
Circuit breaker SXCBR
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
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
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.
Reservation input RESIN
The Reservation input (RESIN) function receives the reservation
information from other bays. The number of instances is the
same as the number of involved bays (up to 60 instances are
available).
Bay control QCBAY
The Bay control QCBAY function is used together with Local
remote and local remote control functions to handle the
selection of the operator place per bay. QCBAY also provides
blocking functions that can be distributed to different
apparatuses within the bay.
Local remote LOCREM/Local remote control LOCREMCTRL
The signals from the local HMI or from an external local/remote
switch are connected via the function blocks LOCREM and
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