DESCRIPTION

The main applications of the MLJ are:
• Connecting a generator to the system.
• Re-establishing the connection between two parts of the system.
• Manual closing of circuit breakers
• Automatic reclosing of a breaker after a relay trip.
The MLJ is a digital synchronism-checking relay that measures bus and line voltages.

It tests:
• Voltage difference
• Frequency slip
• The phase angle between both voltages
The equipment provides an output to enable to close the circuit breaker when all of the values fall within the set limits and remain there for the duration of time chosen for the setting. In the event that all the conditions have not been met, after one minute the equipment gives off a signal showing a failure of closing conditions.
The relay functions in two modes:
• Continuous mode: In this mode synchronism is checked continuously.
• Manual mode: This is activated when voltage is applied through a manually activated input, thus
beginning synchronism control when voltage applied through another digital input for initial checking.