About EASUN MIT 104 PROTECTION HEALTHY RELAY

EASUN MIT 104 PROTECTION HEALTHY RELAY

The MIT overcurrent combine the power and flexibility ofmicrocontroller technology with decades of experience in thefield of protection.MIT has three pole version with two phase & one earth elementand four pole version with 3 phase and one earth element.MIT is housed in a compact 2/3V drawout vedette case.Settings can be done by a readable Human Machine Interfacewhich also serves for fault indication.

The MIT 103/104/113/114 Protection unit consists of thefollowing modules within it™s compact dimensions. Input Module Power Supply and Output Relay module Measuring Module Front FasciaThe three modules viz. Input, Power supply and Measuringmodules are plugged into the Front fascia which houses switches,LEDs and LED display for the human machine interface. All PCBsare well protected from one another and from externalenvironment with best shielding for better electromagneticcompatibility and housed in the enclosed chassis, which is withdrawable from the outer case. The drawout case is providedwith the required CT shorting contacts. The relay has 3 or 4input current transformers.The output from the currenttransformer is transformed to an equivalent voltage and sampledat the rate of 16 samples per cycle and digitized by means ofanalog to digital converter.The digitized signals are processed numerically by means ofmicrocontroller to effectively remove the DC components andto drive the Root Mean Square (RMS) value of the input signal.Based on this and the settings, decisions are taken to eitherelapse the time for inverse characteristics or definite time tooperate the trip output relay. Where highset is included (whichcan be set OFF) an instantaneous tripping is effected once thecurrent exceeds the set value.