ABB RELION 670 Series Product Manual page 37

Transformer protection RET670 2.1 IEC
• 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.
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
ABB
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
M13531-3 v4
(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 LOCREMCTRL to the Bay control QCBAY
function block. The parameter
block LOCREM is set to choose if the switch signals are
coming from the local HMI or from an external hardware
switch connected via binary inputs.
Voltage control TR1ATCC, TR8ATCC, TCMYLTC and
TCLYLTC
The voltage control functions, Automatic voltage control
for tap changer, single control TR1ATCC, Automatic
voltage control for tap changer, parallel control
TR8ATCC and Tap changer control and supervision, 6
binary inputs TCMYLTC as well as Tap changer control
M13486-3 v7
and supervision, 32 binary inputs TCLYLTC are used for
control of power transformers with a on-load tap
changer. The functions provide automatic regulation of
1MRK 504 155-BEN F
M13489-3 v6
M16492-3 v6
M13506-3 v4
M16501-3 v5
M13447-3 v7
M17086-3 v8
ControlMode in function
M5864-3 v11
37