Product description

RDRM35 is a differential protection relay which incorporates a toroidal transformer that allows automatic reconnection of the installation in case the ground fault disappears.

This equipment has been specially designed for those public lighting applications where actions of the maintenance service to re-assemble the differential relays are frequent.

Besides, it also allows remote control of the insulation level and the status of the relay, as well as remote control of the reconnection of the differential relay, which makes this equipment an essential element in public lighting control and supervision system.

Features

• It integrates into a single unit a differential transformer, a relay and a meter of the earth leakage current output in true RMS.
• Automatic self-reclosing of the line without actuation of the maintenance service.
• If the fault persists, the relay locks itself until trying again or the next day when public lighting is switched on again. We can also send it a remote control signal for reconnection purposes
• Possibility to be connected to a street lighting control system for remote control of the reclosing sequence and supervision of the insulation level of the installation. RDRM35 series are specially designed to be used in conjunction with the TELEASTRO system.

Operating Mode

If a fault occurs, the differential relay disconnects the contactor and activates an alarm.

Then it tries to reconnect after 2 minutes, and if the leak persists, the contactor disconnects itself again. The next reconnection it will try will be after 4, 8, 16, 32 and 64 min successively, and after these 6 attempts have elapsed, which will be after a minimum of 126 minutes if the leak still exists, the relay locks itself, leaving the contactor disconnected.

RDRM35 will try to reconnect after complying with one of the following conditions:

• The leak has disappeared, and 15 minutes have elapsed.
• Pressing the Reset key.
• Restart the lighting installation manually or automatically restart it the next day.