Inability to Test Repaired HT Motors in Workshop Posed Problems

Electrical engineering root cause analysis (RCA) related to the inability to test repaired HT motors in the workshop posed problems.

Article Type:Root Cause Analysis (RCA)
Equipment Type:Motors
Author:S. Raghava Chari

Note: This root cause analysis (RCA) is from real-time scenarios that happened in industries during the tenure of two or three decades ago. These articles will help you to improve your troubleshooting skills and knowledge.

Inability to Test Repaired HT Motors Problem

Providing a workshop 3.3 KV power supply is prohibitively expensive. Hence, the crew could not shop run test repaired 3.3 KV motors.


As a visiting rewinding shop engineer advised 3.3 KV Antifriction Bearing Motors self-start and sleeve bearings motors nudge start on 400 V supply. Both run at 10% lower than rated RPM, and.

Benefits Derived

Benefits Derived are as under:

  1. Low voltage shop testing dries the windings well and prevents flashes in the fleld
  2. Enables correcting defects e.g. vibrations, poorly fitted bearings etc. and correcting
  3. The above prevent the hassles: shop to field and return wasteful transport, work permits, HT connections making and breaking etc.

Author: S. Raghava Chari

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