ABB RER620, Техническое руководство, Страница: 330 / 584

Section 5
1MAC309294-MB F
Control functions
324 RER620
Technical Manual
The energizing check function measures the bus and line voltages and compares them to
both high and low threshold detectors. The output is given only when the actual measured
quantities match the set conditions.
The synch-check function in the continuous mode measures the conditions across the
circuit breaker from separate power system parts and compares them to the set limits.
When all the measured quantities are within their set limits simultaneously, that is, the
systems are in synchronism, the output for allowing or executing the circuit breaker
closing is activated.
The synch-check function in the command mode measures the conditions across the circuit
breaker and also determines the angle change occurring during the closing delay of the
circuit breaker from the measured slip frequency. The output is given only when all the
measured conditions are within their set limits simultaneously. The issue of the output is
timed to give closure at the optimal delay of the circuit breaker and the closing circuit.
5.3.4 Operation principle
The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are “On” and “Off”.
The synch-check function has two parallel functionalities, the synch-check and energizing
check functionality. The operation of the synchronism and energizing check function can
be described using a module diagram. All the modules in the diagram are explained in the
next sections.
Figure 167: Functional module diagram
The synch-check function can operate either with V_AB or V_A voltages. The selection
of used voltages is defined with the
VT connection setting of the line voltage general
parameters.