Winding Resistance Transformer and Motor Meter – Overview

The MR8050 can measure highly inductive windings of transformers, motors, and reactors with a range of 100µΩ with 0.01µΩ resolution up to 6kΩ. The performance of the measured objects can be up to 800MVA or even more. The magnetic loading of a transformer is performed quickly using a high loading voltage (60V), this is important for time-critical measurements (cooling curves).  The unloading of the transformer’s core is fast and safe, as the energy is dissipated in the MR8050. The temperature of the measured objects can be pre-set or measured using a PT100 temperature sensor and the resistance is calculated for 20°C using the temperature coefficient for copper or aluminum heat-loss measurements. The resistance at t=0 (disconnection of load) is shown as a result of the internal regression algorithm. Two windings (mostly HV and LV) can be measured simultaneously in the DUAL measuring method. The MR 8050 also features automatic tap-changer control for measuring different taps without interrupting the measuring current.

Winding Resistance Transformer and Motor Meter – Features

• 2 channels for DUAL measurements
• Measuring time short due to very fast uploading
• Discharge time 1/10 of uploading time
• Heat – loss measurements with regression algorithm
• LCD-Display with 240 x 128 pixels with backlight
• USB standard and RS232C 9600 baud
• PT100 connector for PT100 temperature probe
• Tap changer connector for automatic tap control
• Warning system connector for a separate warning light
• Internal test storage for up to 1000 measurements
• Inputs full protected against static and transient voltages
• Wide current ranges from 50mA to 60A

Datasheet