9.5.3 Functionality
The synchronism and energizing check function SECRSYN checks the condition
across the circuit breaker from separate power system parts and gives the
permission to close the circuit breaker. SECRSYN includes the functionality of
synchrocheck and energizing check.
Asynchronous operation mode is provided for asynchronously running systems.
The main purpose of the asynchronous operation mode is to provide a controlled
closing of circuit breakers when two asynchronous systems are connected.
The synchrocheck operation mode checks that the voltages on both sides of
the circuit breaker are perfectly synchronized. It is used to perform a controlled
reconnection of two systems which are divided after islanding and it is also used to
perform a controlled reconnection of the system after reclosing.
The energizing check function checks that at least one side is dead to ensure that
closing can be done safely.
The function contains a blocking functionality. It is possible to block function
outputs and timers.
9.5.4 Analog channel configuration
SECRSYN has two analog group inputs which must be properly configured.
Table 1502: Analog inputs
Input Description
U3P1 Three-phase voltages (bus side)
U3P2 Three-phase voltages (line side)
See the preprocessing function blocks in this document for the possible
signal sources.
There are a few special conditions which must be noted with the configuration.
Table 1503: Special conditions
Condition Description
U3P1 connected to real meas-
urements
The function requires that at least two voltage channels from
the bus side are connected.
U3P2 connected to real meas-
urements
The function requires that one voltage channel from the line
side is connected to channel 1 or any two voltage channels
from the line side.
When a single voltage channel is connected on the line side, the
VT connection
setting of the U3P2 source UTVTR defines whether ph-to-earth or ph-to-ph voltages
are used from both sides in checking the conditions. If at least two voltage channels
are connected on line side, ph-to-ph voltages are used from both sides in checking
the conditions regardless of the
VT connection
settings of the source UTVTRs.
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings.
Control functions
1MRS759142 F
1544 REX640
Technical Manual
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