Monitored Data - ABB Relion Technical Manual

1MRK 502 048-UUS A
12.1.6
12.1.7
12.1.7.1
Technical manual

Monitored data

Table 212: SESRSYN (25) Monitored data
Name Type
VDIFFME REAL
FRDIFFME REAL
PHDIFFME REAL
Vbus REAL
VLine REAL
Operation principle
Basic functionality
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 single circuit breaker double bus and breaker-and-a-half circuit breaker arrangements,
the SESRSYN (25) function blocks have the capability to make the necessary voltage
selection. For single circuit breaker double bus 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/line disconnectors as well as the circuit breakers.
The internal logic for each function block as well as, the input and outputs, and the settings
with default setting and setting ranges is described in this document. For application
related information, please refer to the application manual.
Values (Range) Unit
- -
- Hz
- deg
- kV
- kV
Section 12
Control
Description
Calculated difference of
voltage in p.u of set voltage
base value
Calculated difference of
frequency
Calculated difference of phase
angle
Bus voltage
Line voltage
351