Switch Controller Scswi; Circuit Breaker Sxcbr; Reservation Function Qcrsv; Local Remote Locrem/Local Remote Control Locremctrl - ABB RET670 Product Manual

Transformer protection RET670 2.0
Product version: 2.0
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.

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.
34
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
LOCREMCTRL to the Bay control QCBAY function block. The
ControlMode in function block LOCREM is set to
parameter
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 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
the voltage on the secondary side of transformers or
alternatively on a load point further out in the network.
Control of a single transformer, as well as control of up to eight
transformers in parallel is possible. For parallel control of power
transformers, three alternative methods are available, the
master-follower method, the circulating current method and the
reverse reactance method. The first two methods require
exchange of information between the parallel transformers and
this is provided for within IEC 61850-8-1.
Voltage control includes many extra features such as possibility
of to avoid simultaneous tapping of parallel transformers, hot
stand by regulation of a transformer in a group which regulates
it to a correct tap position even though the LV CB is open,
compensation for a possible capacitor bank on the LV side bay
of a transformer, extensive tap changer monitoring including
contact wear and hunting detection, monitoring of the power
flow in the transformer so that for example, the voltage control
can be blocked if the power reverses etc.
Logic rotating switch for function selection and LHMI
presentation SLGAPC
The logic rotating switch for function selection and LHMI
presentation SLGAPC (or the selector switch function block) is
used to get an enhanced selector switch functionality
compared to the one provided by a hardware selector switch.
1MRK 504 141-BEN C
ABB