The M-series earth leakage detectors are developed for the protection of hazardous conditions caused
by high resistance earth faults on the 1000 to 3300 Volt Power Systems.
The following two types of detectors are now available.
When a fault condition is detected,the detector activates other standard low voltage off-the-shelf isolating equipment,thus isolating the power to the step transformer.
Both units required a specially desinged 100/1 CT for detecting the earth leakage current.The CT's can be connected in two modes of operation.The one mode of operation is where it is used as a balanced core CT on the secondary side (high voltage side) of a step up transformer.In this mode,it will detect any off balances in the summed load current.The second mode of operation is where the earth wire, of a grounded star point ,feeds through the CT.In this application the CT will detect any earth current flowing through the earth wire.
The detector dimensions are 70x72x30 (millimetres) and clips on to a standard DIN rail.