How to megger a dc motor

Testing AC Motors and Working on Westinghouse Generator - Duration: 6:01. BTCInstrumentation 656views. Very good explanation of HV insulation testing and its value. Visual inspec- tion and electrical testing of the armature and fields give the maintenance personnel an under- standing of the condition of the motor.

In cases such, a meg ohm test or megger may be required.

Figure 2–Typical Megger test instrument hook-up to measure insulation.

Megger supplies graph paper which makes it easy to plot megohms of insulation resistance from your voltage and current readings.

The Complete Guide to Electrical Insulation. Using Megohm meter insulation resistance is measured. The layer insulation has been examined by the impulse test. The winding temperature should be 25°C ± 15°C. The point is, the motor windings are connected phase-to- phase.

Therefore, you can get from any point in the windings to any other point in the windings without leaving the motor. Using Ohm meter: Disconnect all power from machine. Check all three wires singly TTT(all three phases) to the.

DC diagnostic insulation testing. V diagnostic insulation resistance tester. V high performance diagnostic insulation tester.

C generator or Battery connection : Testing voltage is produced by hand operated DC generator for manual operated Megger. Operating and Maintenance Manuel ± KG Series. High voltage and rotating parts can cause serious or fatal injury. The DC Motor must be placed on firm foundations.

A push switch is connected in series with the battery and opens the circuit during transformer polarity testing. The dc zero-center ammeter indicates correct or incorrect rotation or polarity by deflecting its pointer to the right or . DC motor troubleshooting, inspection and Learn to repair of DC motor Brushes and Commutators. Note before removing DC motor brushes- always put the brush back in the same hole of the motor.

They provide the most surface contact since they are worn in. Megger is done to find the insulation resistance. Motor Maintenance - SCHEDULED ROUTINE CARE - The key to minimizing motor problems is scheduled routine inspection and service.

AC, however, does not allow the . Megohmmeters (meggers) are electrical meters used to check the resistance and condition of the motor windings and the condition of the refrigeration and oil environment around the motor windings.