ABB REC670 Product Manual page 11

ABB
Bay control REC670
Pre-configured
Product version: 1.1
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.
Features in the apparatus control function:
• 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 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 security
with enhanced security is always terminated
by a CommandTermination service primitive.
Control operation can be performed from the
local HMI under 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
1MRK 511 192-BEN B
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.
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 motor driven load
tap changer. The function provides 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 two former methods
require exchange of information between the
parallel transformers and this is provided for
within IEC61850-8-1.
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
Issued: June 2010
11