ABB RELION 620 Series Technical Manual page 1003

1MRS757644 F
9.3
9.3.1
9.3.2
9.3.3
620 series
Technical Manual
Synchronism and energizing check SECRSYN
Identification
Function description
Synchronism and energizing check
Function block
GUID-9270E059-ED17-4355-90F0-3345E1743464 V2 EN
Figure 513: Function block
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.
IEC 61850 IEC 60617
identification identification
SECRSYN SYNC
Section 9
Control functions
ANSI/IEEE C37.2
device number
25
997