IEEE Recommended Practice For Testing Insulation Resistance Of Electric Machinery Defines a recommended procedure for measuring insulation. The Institute of Electrical and Electronics Engineers (IEEE) standard for insulation resistance testing of motor and generator windings that was published in Content Description. Revision Standard – Active. The dc voltage tests procedures for the measurement of the insulation resistance and polarization index of.
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All others, please contact us at info madcad. It is recommended that subsequent ac high-potential testing not be conducted until the winding is fully discharged. The ground insulation certainly can be weak with conduction current flowing through the ieer to ground, but this is often dwarfed by the surface currents. You can change your cookie settings through your browser. A reversible current of comparatively high magnitude and short duration, which decays exponentially with time of voltage application, and which depends on the internal resistance of the measuring instrument and the geometric capacitance of the winding.
Megohm measurements may be tracked over time to help determine when a motor or generator should be reconditioned. The quotient of the insulation resistance at time t 2 divided by the insulation resistance at eiee t 1.
What’s new in the IEEE 43 insulation resistance testing standard? | EASA
A current that is constant in time, that passes through the bulk insulation from the grounded surface to the high-voltage conductor, and that depends on the type of bonding material used in the insulation system. IEEE is led by a diverse body of elected and appointed volunteer members. This time interval is based on the R resistiveL inductiveC geometric capacitiveand absorptive characteristics of the circuit during charging time of the application of the voltage and discharging elapsed time since the removal of the 34-2013 source and subsequent grounding of the winding under test.
The dc voltage tests procedures for the measurement of the insulation resistance and polarization index of insulated stator, and rotor windings and how to interpret the results are described in this recommended practice. Get a Quote Careers Exhibitions.
The measured insulation resistance will usually rapidly increase when the voltage is first applied, and then gradually approach a relatively constant value as time elapses see Idee 4. The safety measures described are by no means exclusive.
This current is usually zero if the motor is new or undamaged. Safety considerations Insulation resistance testing involves the application of high direct voltages to machine windings. Clause 1 and Clause See information below on minimum megohm levels. Valid Buy this standard. Note that the effects of moisture contamination iese a healthy winding should ieeee preclude obtaining acceptable readings. Poluicao em Isoladores Artigos sobre Poluicao em Isoladores.
It is not possible to 43–2013 all safety aspects in this recommended practice and test personnel should consult. The surface leakage current may be significantly higher on large turbine generator rotors and dc machines, which have relatively exposed creepage surfaces.
For test voltages V and above, the lead between the test set and the winding must be appropriately insulated and spaced from otherwise, surface 432-013 currents and corona loss may introduce errors in the test data. The insulation resistance of a rotating machine winding is a function of the type and condition of the insulating 43-201 used, as well as their application technique. The absorption current has two components. C, and taken at a specified time t from start of voltage application.
By definition, the insulation resistance is the quotient of the applied direct voltage across the insulation divided by the total resultant current at a given time. Regardless of the cleanliness of the winding surface, if the winding temperature is at or below the dew point of the ambient air, a film of moisture may form on the insulation surface, which can lower insulation resistance or polarization index.
After the applied direct voltage is removed, a suitable discharge circuit should be provided see Clause 4. Usually, for clean and dry rotating machine insulation, the insulation resistance between about 30 s and a few minutes is primarily determined by the absorption current. The discharge current manifests itself in two components:.
Who knows, maybe no better ifee all? The first component is due to the polarization of the impregnating materials because the organic molecules, iee as epoxy, polyester, and asphalt, tend to change orientation in the presence 43-20113 a direct electric field.
IEEE 43-2013 PDF
See Annex A for the use of other values. There were no books found for the applied search filters.
Modern types of filmcoated wire, as well as epoxy-mica or polyester-mica insulated stator windings, may approach a constant value of insulation resistance in 4 min or less.
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