4. Control
Synchrocheck, energizing check, and
synchronizing SESRSYN (25)
The Synchronizing function allows closing of
asynchronous networks at the correct moment
including the breaker closing time, which improves
the network stability.
Synchrocheck, energizing check, and synchronizing
(SESRSYN, 25) function checks that the voltages on
both sides of the circuit breaker are in synchronism,
or with at least one side dead to ensure that closing
can be done safely.
SESRSYN (25) function includes a built-in voltage
selection scheme for double bus and breaker-and-a-
half or ring busbar arrangements.
Manual closing as well as automatic reclosing can
be checked by the function and can have different
settings.
For systems which are running asynchronous a
synchronizing function is provided. The main
purpose of the synchronizing function is to provide
controlled closing of circuit breakers when two
asynchronous systems are going to be connected.
It is used for slip frequencies that are larger than
those for synchronism check and lower than a set
maximum level for the synchronizing function.
Autorecloser for 3-phase operation (79)
The autorecloser SMBRREC, 79 function provides
high-speed and/or delayed auto-reclosing for single
breaker applications.
Up to five three-phase reclosing attempts can be
included by parameter setting.
The autoreclosing function can be configured to co-
operate with a synchronism check function.
Apparatus control APC
The apparatus control functions are used for control
and supervision of circuit breakers, disconnectors
and grounding switches within a bay. Permission to
operate is given after evaluation of conditions from
other functions such as interlocking, synchronism
check, 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 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
Direct commands are received with no prior select
command. SBO commands are received with a
select command first and on successful selection, a
proceeding operate command.
In normal security, the command is processed and
the resulting position is not supervised. However
with enhanced security, the command is processed
and the resulting position is supervised.
Control operation can be performed from the local
HMI under authority control if so defined.
Bay control REC650 ANSI 1MRK 511 265-BUS B
Product version: 1.2
ABB 19
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