Logic Diagrams - ABB Relion 650 Series Technical Manual

Section 8
Control
8.1.7.2
136
The energizing check feature 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 feature 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 closing of the
output is timed to give closure at the optimal time including the time needed for the
circuit breaker and the closing circuit operation.
The voltage difference, frequency difference and phase angle difference values are
measured in the IED centrally and are available for the SESRSYN function for
evaluation. By setting the phases used for SESRSYN, with the settings
SelPhaseBus1, SelPhaseBus2, SelPhaseLine1 and SelPhaseLine2, a compensation
is made automatically for the voltage amplitude difference and the phase angle
difference caused if different setting values are selected for both sides of the
breaker. If needed, an additional phase angle adjustment can be done for selected
line voltage with the PhaseShift setting.
For double bus single circuit breaker and 1½ circuit breaker arrangements, the
SESRSYN 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 1½
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.

Logic diagrams

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.
Synchrocheck
When the function is set to OperationSC = On, the measuring will start.
The function will compare the bus and line voltage values with the set values for
UHighBusSC and UHighLineSC.
If both sides are higher than the set values, the measured values are compared with
the set values for acceptable frequency, phase angle and voltage difference:
FreqDiffA, FreqDiffM, PhaseDiffA, PhaseDiffM and UDiffSC. If additional phase
angle adjustment is done with the PhaseShift setting, the adjustment factor is
deducted from the line voltage before the comparison of the phase angle values.
1MRK 511 424-UEN B
IP14739-1 v1
M14833-3 v5
M14834-3 v15
Bay control REC650 2.2 IEC
Technical manual