Fault indicator

Type MD

The earth-fault and short-circuit indicator can be used in radial networks with one input and open-ring networks. The connection between the short-circuit sensors and accordingly
the earth-fault sensor to the display unit is done by cable. All sensors must be mounted on screened cables only. The sensors are divisible and can be retrofi tted on the cable. For the operation of the display device an auxiliary power supply is required. The auxiliary power supply can fail in case of a fault, therefore the device is equipped with an exchangeable lithium backup battery. The indicators of the MD-Series have a LCD display for the indication of faults and for the display of the present network current of each phase. The indicators can be confi gured with the LCD display.

The indicators are available in different versions:

– Earth-fault indicator type MD-E
– Short-circuit indicator type MD-K
– Earth-fault and Short-circuit indicator type MD-EK

Depending on the version, the earth-fault and short-circuit indicator type LCD-Series consists of:

– One display unit for displaying the earth-fault and short-circuit
– Three sensors type SK (page 17) for detecting the short-circuit
– One sensor type SE (page 19) for detecting the earth-fault