IEEE 252-1995 pdf download IEEE Standard Test Procedure for Polyphase Induction Motors Having Liquid in the Magnetic Gap
3.1.1 Routine test
The routine test includes measurement of speed, power input, and current input at no load, rated voltage ancfrequency: power input and current input with locked rotor; and, winding resi stance, insulation resi stance.and dielectric test. The locked rotor test may also be performed with singlephase power applied to themotor. Form 1 may be used for reporting such data
3.1.2 Complete test
The complete test includes a routine test plus addi tiona tests necessary to determine efficiency, power factor.
starting torque, breakdown torque, rated-load slip, and rated-load temperature rise.
Form 2 may be used for reporting such data Additiona tests, such as measurement of noise, vibration, ancspeed-torque characteristics that are described in this test procedure, and other tests, such as measurement ofshaft currents that are not covered in this test procedure, may be used.
3.2 Choice of test
A complete list of tests covered by this procedure is given in the contents. Alternate methods are describedfor making many of the tests. In some cases the preferred method is indicated.
3.3 Cautions
Many lEEE and ANSl standards are referenced in this document. The standards referenced will be those ineffect when this revision is approved. Users are cautioned to carefully review the history of old machineswith respect to IEEE and ANSI standards in effect at the time when they were manufactured
4. Electrical measurements
4.1 General
Electrical measurements shall be made in accordance with IEEE Std 120-1989.
4.2 Power supply
The supply voltage shall closely approach sine-wave form and shall provide bal anced phase voltages. Thevoltage waveform deviation shall not exceed 10% The frequency shall be closely regulated and shall be
measured within an accuracy of 0.1% of rated val ue.
4.3 Instrument selection
The instruments used in electrical measurements shall be selected to give indications well up on the scale.i.e., where a fraction of a division is easily estimated and where such a fraction is a small percentage of theval ue read. The indicating instruments shall bear record of calibration within 12 months of the test, indicating limits of error no greater than + 0.5%% of full scale.
IEEE 252-1995 pdf download
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