GE GEH-5304A manual Effect of Temperature on Insulation Resistance, Cleaning of Windings

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GEH-5304A

Table 13

Effect of Temperature on Insulation Resistance

Winding Temperature

(Degree C)

80

70

60

50

40

30

20

10

Multiplying Factor to Obtain Insulation

Resistance at 40°C (104°F)

10.00

5.50

3.10

1.70

1.00

0.55

0.31

0.17

Note that for a 104°F (40°C) decrease in temperature, the insulation resistance is increased by a mul- tiplier of ten.

The insulation resistance of a machine is affected by its design. The insulation resistance of the ar- mature circuit, corrected to 104°F (40°C), should measure at least 1.5 megohms. If measured value is below 1.5 megohms, clean and re-test.

If the measurements are less than this limit, the machine should be dried or cleaned to attempt to in- crease the insulation resistance. Regular, periodic measurements of insulation resistance can give a useful indication of the rate of insulation system deterioration. External connections should be re- moved to isolate the windings to be tested and megger value logged. A sudden drop or consistent trend toward low values of insulation resistance, although possibly caused by moisture or contamina- tion, generally gives evidence the insulation system is deteriorating and that failure may be imminent.

High-potential tests are not recommended on machines which have been in use. If such a test is made immediately after installation, the test voltage should not exceed 85% of the original factory test of two times the rated volts plus 1000 volts.

NOTE: Surge testing and AC impedance tests of windings to detect shorts should be performed by trained personnel only.

M.Cleaning of Windings

If windings become contaminated, suitable cleaning methods can be used to alleviate the problem.

The machine should be de-energized and slowly rotated by hand to permit maximum dust removal. Dry dirt, dust or carbon should first be vacuumed – without disturbing adjacent areas or redistributing the contamina- tion. Use a small nozzle or tube connected to the vacuum cleaner to enter into narrow openings (i.e., be- tween commutator risers). A soft brush on the vacuum nozzle will loosen and allow removal of dirt more firmly attached.

This vacuum cleaning may be supplemented by blowing with compressed air (air pressure should be in ac- cordance with OSHA standards), which has passed through a dryer to remove moisture before entering the motor.

Dirt can collect on the inside surface of the drive end coil support and on the underside of the armature coils. This dirt can be easily removed with compressed air or a vacuum.

It is important to realize that when blowing out a machine, dirt may settle in a previously cleaned area and it may be necessary to repeat the cleaning process to ensure that a thorough job is done.

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Contents Instructions Copyright 1985, 1992, 1999 General Electric Company Table of Contents Storage of Renewal Parts II. Receiving StorageHandling Typical Weights LocationAlignment MountingCoupled Drive Belt Drives GroutingBearing Life Belt Tension Factor, Kb Special Load Considerations Pinion DrivesThrust Loads Maximum Continuous Thrust Capacity, LbsRectified Power Supplies Inspection Before StartingBearings and Couplings Commutator and BrushesBearing Life at 1750 RPM Average Speed Vs. Load, W Speed Life Factor Less Than 500Frame Sizes CD2812AT and CD2813AT Power Supply Available Connections Protective DevicesMotor Field Heating ThermostatsAccessories & Special Device Markings Lead Markers FunctionWinding A1, A2 F1, F2, F3, F4, etc. T1, T2, T3, T4, etcVentilation System General Mechanical InspectionAccessory Mounting Bolt Tightening Torque ValuesBrakes Inspection After StartingInspection After Short Time in Service Noise and VibrationDisassembly ReassemblyReplacement of Bearings Recommended Regreasing PeriodsFrame Size CD2512AT- CD2813AT Average Standard Bearings for CD2512AT-CD2813AT MotorsStandard Temperature 15F to 212F -10C to 100C Low TemperatureHigh Temperature-20F to 350F -28C to 176C Sources of Supply for Bearing GreasesBrush Installation Commutator Brush AssemblyCommutator Diameters In Inches Mechanical Shaft End PlayWaterproof Machines Lubrication of Flexible CouplingsGEH-5304A Ues Testing Methods Visual Inspection Insulation Resistance MeasurementEffect of Temperature on Insulation Resistance Cleaning of WindingsOily Dirt Drying of Windings Service Shop CleaningRepair VI. Renewal Parts Storage of Renewal PartsNumber of Duplicate Motors in Service Description Recommended Spare PartsWith or Without Electrical Shop Facilities With Electrical Shop FacilitiesCommutator Check Chart Application Information for CD2512AT CD2813AT Frames GEH-5304A Dimensions, Air Openings for CD2512AT CD2813AT Frames Air Flow Requirements For Separately Ventilated Motors Frame 2512AT, 2513AT 2812AT, 2813AT Base SpeedAll Renewal Parts For CD2512AT CD2813AT FramesAccessory Mounting CD2512AT CD2813AT Accessory Mounting CD2512AT CD2813AT GEH-5304A Type CD Frames 2512AT 2813AT 5HDGHU&RPPHQWV Detach and fax or mail to the address noted above Fort Wayne in 46801-2205 USA Isaac #

GEH-5304A specifications

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