9.3.2
Function block
Figure 523: Function block
9.3.3
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 if desired.
9.3.4
Operation principle
The function can be enabled and disabled with the
Operation setting. The
corresponding parameter values are "On" and "Off".
SECRSYN has two parallel functionalities, the synchro check and energizing check
functionality. The operation of SECRSYN can be described using a module diagram.
All the modules in the diagram are explained in the next sections.
1MRS757644 H
Control functions
620 series
Technical Manual
999
