Questions about motors (practical tests)

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Discussion Overview

The discussion revolves around practical testing procedures for motors, specifically focusing on high voltage tests for stator windings in three-phase machines. Participants explore safety concerns, testing methods, and necessary precautions during these tests.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the procedure for testing a single stator winding phase, suggesting that the other phases should be left open during the test.
  • There is a concern raised about the dangers associated with applying 12kV DC and AC for testing, with a specific inquiry into which method poses more risk to the operator.
  • Another participant references a source indicating that voltage should be applied to all stator windings simultaneously, which contrasts with the initial suggestion of testing one phase at a time.
  • Safety procedures are discussed, with one participant emphasizing the need for licensed electricians and suitable protective equipment against electrical hazards.
  • There is mention of the need to discharge accumulated electricity in the stator windings using short circuiting devices, although the exact method is not detailed.

Areas of Agreement / Disagreement

Participants express differing views on the testing procedures and safety measures, with no consensus reached on the best practices for testing and the associated risks.

Contextual Notes

Participants have not fully resolved the assumptions regarding the testing methods and safety protocols, and there are varying interpretations of the appropriate procedures based on different sources.

Xaras
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Homework Statement
Questions about motors (practical tests)
Relevant Equations
synchronous/induction motors
Problem Statement: Questions about motors (practical tests)
Relevant Equations: synchronous/induction motors

Hey guys,

Some practical questions about motors :)

Let's admit I have to test one stator winding phase (in high voltage, we test one at the time). During this test what do you do with the others phase ? We let them open right ?

I have to test a 3 phase machine by applying 12kV DC and AC for 10min.

The more dangerous test to the winding is the DC right ? I don't remember why ...

When you finish these tests you remove the test leads. What is the most dangerous for the operator ? Is it to open leads after AC or DC testing ?

I think to open leads after AC testing is the more dangerous.

I have also to suggest some security procedures to make it the safer. I don't have any idea for this ... I think maybe to put thick cables for the safety ground right ?

Thaksfor the help !
 
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Nobody has an idea ? :)
 
According to EPRI Power Plant Electrical Reference Series Vol. 6 chapter 6.8. Winding Insulation. Insulation Testing:
245028


That means you have to apply the voltage on all stator windings simultaneously.
 
Xaras said:I have also to suggest some security procedures to make it the safer
First you have to be a licensed electrician authorized to work on high voltage installations.
Second, you have to use suitable equipment [against arc flash, electrical shock protection and other] The stator windings presents a certain capacity and you have to discharge the accumulated electricity by using short circuiting devises
 
Sorry: using short circuiting devices
 

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