Electric generator inspection system and motor controller

• US 5,105,658 A
• Filed: 11/01/1990
• Issued: 04/21/1992
• Est. Priority Date: 02/11/1987
• Status: Expired due to Term

• Current Assignee: Siemens Power Generation, Inc.
• Original Assignee: Westinghouse Electric Corporation (Paramount Global (f/k/a ViacomCBS Inc.))
• Inventors: Dailey, George F., Rethage, Wilbert B., Guenther, Paul, Pompa, Gerard A., Jaafar, Hamedo A., Katzor, Karl A.
• Primary Examiner(s): RAEVIS, ROBERT R
• Application Number:
  US07/608,136
• Time in Patent Office: 537 Days
• Field of Search: 73/865.8, 73/12, 73/572, 358/100, 358/106, 358/107, 358/108, 324/158 MG, 324/551, 324/545, 324/554
• US Class Current: 73/865.8
• CPC Class Codes: G01R 31/34 Testing dynamo-electric machines

Abstract

An inspection system inspects the interior of the stator of an electric generator for the existence of several problems. The inspection apparatus is mounted on a carriage that travels along the slots defined by the stator. An indexer is mounted to the rotor of the generator and can travel around the circumference of the rotor to deliver the carriage to the desired slot. An indexer plate is mounted to the indexer and can be registered with the desired slot to insure that the carriage can enter the slot from the indexer. An associated motor controller disables the motor if an electrical fault is disclosed.

Claims

1. An inspection system for an electric generator comprising:

a carriage adapted to travel along the slots defined by the stator of the generator;

means mounted on said carriage for inspecting and providing information pertaining to the electrical integrity of the stator lamination insulation of the generator;

means for moving said carriage along the stator slots to sites of inspection;

an indexer adapted to be releasably secured to the rotor of the generator, said carriage and said indexer being adapted to permit said carriage to be received and retained by said indexer when said carriage exits a slot;

means for aligning said indexer with each slot to permit said carriage to enter the slot when said carriage travels out of retention of said indexer;

means for moving the indexer around the circumference of the rotor to deliver said carriage to a desired slot; and

means for causing said apparatus to conduct an inspection at an inspection site.

2. The system of claim 1 wherein said apparatus for inspecting and providing information pertaining to the electrical integrity of the stator lamination insulation includes means for visually inspecting the stator lamination insulation.

3. The system of claim 1 wherein said apparatus for inspecting and providing information pertaining to the electrical integrity of the stator lamination insulation includes means for measuring fault currents generated when insulation breakdown between two or more adjacent laminates of the teeth of the stator of the generator occurs.

4. An inspection system for an electric generator comprising:

a carriage adapted to travel along the slots defined by the stator of the generator;

means mounted on said carriage for visually and remotely inspecting the interior surfaces of the stator of the generator;

means for moving said carriage along the stator slots to sites of inspection;

an indexer adapted to be releasably secured to the rotor of the generator, said carriage and said indexer being adapted to permit said carriage to be received and retained by said indexer when said carriage exits a slot;

means for aligning said indexer with each slot to permit said carriage to enter the slot when said carriage travels out of retention of said indexer;

means for moving the indexer around the circumference of the rotor to deliver said carriage to a desired slot; and

means for causing said apparatus to conduct an inspection at an inspection site.

5. The system of claim 4 wherein said apparatus for visually and remotely inspecting the stator lamination insulation includes a camera.