Insulation resistance tester
CIRCUTOR
Class 1.5
Insulated or impedance neutral system (IT system)
The MEG-1000 is equipment which measures and checks, using a relay, the isolating resistance between a phase and earth in a neutral isolated or impeded line ( IT ). The amount of isolating resistance may be displayed on a galvanometric indicator on the front of the equipment. To carry out the measurement, the equipment applies a direct, 24V current between the phase and earth and measures the leakage current fl owing through the isolating resistances in the system.. This current determines the isolation resistance.
The equipment has two timed output relays, one which operates on the maximum (trips when the resistance exceeds a preset value) and another which operates on the minimum (trips when the isolation resistance is below another preset value). Both relays have a trip point and a connection delay time which may be set by using the potentiometers located at the back of the equipment. In the event that the isolation resistance is between the maximum and minimum values defi ned by the potentiometers, the NORMAL LED on the front lights up. When the resistance is outside the defi ned margin, either above or below, the ALARM LED lights up on the front.
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