GEK - 105560
11
3. OPERATION PRINCIPLES
The MLJ can be described as the function of a group of different units, each being responsible for one
part of the overall operation.
3.1 CONFIGURATION UNIT
The configuration unit allows us to select and change the following parameters:
•
Frequency (50 or 60 Hz).
•
Unit number.
•
Communication speed.
3.1.1 GENERAL Settings
The configuration unit has the following settings:
0-1: f
Operation frequency
Range: 50 or 60
Units: Hz
Default value: 50
6-1: COM. ID
Unit number (relay identifier)
Range: 1-255
Default value: 1
6-2: COM. kbauds
Serial port baud rate
Range: 0.3, 0.6, 1.2, 2.4, 4.8, 9.6, 14.4, 19.2, 38.4
Units: kilobauds
Default value: 9.6
NOTE
:
Settings 6-1 and 6-2 are the only ones that do no restart the protection since they only affect
communications. The rest of the protection settings restart the protection.
3.2 SYNCHRONISM CHECK UNIT
The main function of the MLJ is that of providing synchronism conditions for circuit breaker closures.
The synchronism check unit analyzes the voltage magnitudes at both side of the circuit breaker, and
the status of inputs and the settings, giving a synchronism signal if the conditions are met.
Depending on the status of the Manual input, this unit has two modes of operation: Manual mode and
Continuous mode. They are both described below.
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