Cage Rotor Motor

Title

Cage Rotor Motor

Brief Introduction

If a resistance reading cannot be made in the time interval specified in Table 6, it shall be made as soon as possible but not aftermore than twice the interval specified in Table 6, and additional readings shall be taken at intervals of approximately 1 min until these readings have begun a distinct decline from their maximum value . A curve of these readings shall be plotted as a function of time and extrapolated to the appropriate time interval of Table 6 for the rated output of the machine . A semi - logarithmic plot is recommended where temperature or resistance is plotted on the logarithmic scale . The value of temperature thus obtained shall be considered as the temperature at shutdown . If successive measurements show increasing temperatures after shutdown the highest value shall be taken .

If a resistance reading cannot be made until after twice the time interval, this method of correction shall only be used by agreement .

For machines with one coil - side per slot , the resistance method by direct measurement may be used if the machine comes to rest within the time interval. If the machine takes more than 90 s to come to rest after switching off the power , the superposition method may be used il previously agreed .

The detectors shall be suitably distributed throughout the winding and the number of detectors installed shall be not less than six .

All reasonable efforts , consistent with safety , shall be made to place the detectors at the points where the highest temperatures are likely to occur , in such a manner that they are effectively protected against contact with the primary coolant .

The highest reading from the ETD elements shall be used to determine the temperature of the winding .

ETD elements or their connections may fail and give incorrect readings . Therefore , if one or more readings are shown to be erratic , after investigation they should be eliminated .

The detectors shall be located between the insulated coil - sides within the slot in positions at which the highest temperatures are likely to occur .

The detectors shall be located between the wedge and the outside of the winding insulation in positions at which the highest temperatures are likely to occur.

The temperature detectors shall be located between two adjacent coil - sides within the end windings in positions where the highest temperatures are likely to occur . The sensing point of each detector shall be in close contact with the surface of a coil - side and be adequately protected against the influence of the coolant.

Main Technical Parameters

Application

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