1MAC309294-MB F Section 5
Control functions
RER620 323
Technical Manual
5.2.12 Technical data
Table 303: 79 Technical data
5.3 Synch-check/voltage check 25
5.3.1 Identification
5.3.2 Function block
Figure 166: Function block
5.3.3 Functionality
The synch-check function 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 synch-check 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 synch-check 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.
Characteristic Value
Trip time accuracy ±1.0% of the set value or ±20 ms
Functional description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Synchronism and energizing check SECRSYN SYNC 25
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