9.3.3
Functionality
The synchronism and energizing check function 25 checks the condition across the circuit
breaker from separate power system parts and gives the permission to close the circuit
breaker. 25 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 “Enable” and “Disable”.
25 has two parallel functionalities, the synchro check and energizing check functionality.
The operation of 25 can be described using a module diagram. All the modules in the
diagram are explained in the next sections.
Energizing
check
Synchro
check
GUID-72E99872-C94E-4B9F-9EF8-C479C8ED8F6B V2 EN
Figure 259:
Functional module diagram
1MRS240050-IB C
Section 9
Control functions
REF615R
497
Technical Manual
Summary of Contents for RELION REF615R
Page 1: ... RELION PROTECTION AND CONTROL REF615R Technical Manual ...
Page 2: ......
Page 27: ...Section 18 Glossary 653 Table of contents REF615R 21 Technical Manual ...
Page 28: ...22 ...
Page 36: ...30 ...
Page 46: ...40 ...
Page 115: ...3 15 4 Settings 1MRS240050 IB C Section 3 Basic functions REF615R 109 Technical Manual ...
Page 118: ...112 ...
Page 318: ...312 ...
Page 388: ...382 ...
Page 456: ...450 ...
Page 520: ...514 ...
Page 652: ...646 ...
Page 656: ...650 ...
Page 658: ...652 ...
Page 663: ...657 ...