14.1.6 Monitored data
PID-3845-MONITOREDDATA v6
Table 445: SESRSYN (25) Monitored data
Name Type Values (Range) Unit Description
VDIFFME REAL - - Calculated difference of voltage in p.u of
set voltage base value
FRDIFFME REAL - Hz Calculated difference of frequency
PHDIFFME REAL - deg Calculated difference of phase angle
VBUS REAL - kV Bus voltage
VLINE REAL - kV Line voltage
14.1.7 Operation principle
14.1.7.1 Basic functionality
M14832-3 v7
The synchronism check function measures the conditions across the circuit breaker and compares
them to set limits. The output is only given when all measured quantities are simultaneously
within their set limits.
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 synchronizing function 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 measured conditions are
simultaneously within their set limits. The issue of the output is timed to give closure at the
optimal time including the time for the circuit breaker and the closing circuit.
For double bus single circuit breaker and breaker-and-a-half circuit breaker arrangements, the
SESRSYN (25) function blocks have the capability to make the necessary voltage selection. For
double bus single circuit breaker arrangements, selection of the correct voltage is made using
auxiliary contacts of the bus disconnectors. For breaker-and-a-half circuit breaker arrangements,
correct voltage selection is made using auxiliary contacts of the bus disconnectors as well as the
circuit breakers.
The internal logic for each function block as well as, the input and outputs, and the setting
parameters with default setting and setting ranges is described in this document. For application
related information, please refer to the application manual.
14.1.7.2 Logic diagrams
IP14739-1 v1
Logic diagrams
M14833-3 v4
The logic diagrams that follow illustrate the main principles of the SESRSYN function components
such as Synchrocheck, Synchronizing, Energizing check and Voltage selection, and are intended to
simplify the understanding of the function.
1MRK 502 066-UUS B Section 14
Control
753
Technical manual
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