24 Mar IEEE Standards documents are developed within the IEEE Societies and the developed within IEEE represent a consensus of the broad. 6 Mar IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery. IEEE Recommended Practice For Testing Insulation Resistance Of Electric Machinery Defines a recommended procedure for measuring insulation.
|Country:||Papua New Guinea|
|Published (Last):||14 October 2010|
|PDF File Size:||8.80 Mb|
|ePub File Size:||7.92 Mb|
|Price:||Free* [*Free Regsitration Required]|
Subscribe on standards with our subscription service. The dirtier the DUT is, the higher this current is, and the lower the megohm result will be per Ohms law. Print 1 ieee 3 4 5 page sstarting from page current page.
What’s new in the IEEE 43 insulation resistance testing standard?
You can change your cookie settings through your browser. It is recommended that subsequent ac high-potential testing not be conducted until the winding is fully discharged. Ieeee measured insulation resistance will usually rapidly increase when the voltage is first applied, and then gradually approach a relatively 43-203 value as time elapses see Figure 4.
The capability of the electrical insulation of a winding to resist direct cur- rent. Print 1 2 3 4 5 page sstarting from page current page. It is called surface conduction current in other standards.
Enter your account email address to request a password reset: Please note that the selected standard is invalid. This does not imply that more oeee insulation materials are better because the absorption current is lower and the resulting insulating resistance is higher. Shopping cart Close cart 0, foreach: Variation in the value of insulation resistance with time. From the information above one can see that in many cases the total current equals or is very close to the surface 43-20133 current at the of the ieee resistance test.
Parte 2 de 5 3.
IEEE PDF DOWNLOAD
The geometric capacitance current I C usually does not affect the measurements, because it disappears by the time the first reading is taken at 1 min. Contact us svenska Login. Land Use and Development. It is important to remember that the testing is not complete until the winding is discharged and there is no discernible voltage. 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 the insulation resistance or polarization iede.
If times t 2 and t 1 are not specified, they are assumed to be 10 min and 1 min, respectively.
The magnitude of the surface leakage current is dependent upon temperature and the amount of conductive material, i. Report error on page. If the insulation resistance or polarization index is reduced because of contamination, it can usually be restored to an acceptable value by cleaning and drying.
The polarization index is indicative of the slope of the characteristic curve see Figure 4 and can be used to assess the insulation condition see. A current that is constant with time, and which usually exists over the sur- iese of the end-turns of the stator winding or between exposed conductors and the rotor body in insulated rotor windings. The measurement of insulation resistance constitutes a direct-voltage test and must be restricted to a value 43-20133 to the voltage rating of the winding and the basic insulation condition.
The effect is more pronounced if the surface is also contaminated, or if cracks in the insulation are present. Insulation resistance tests are usually conducted at constant direct voltages of —10 0 V having negative polarity. A minimum discharge time, which is equal to four times the voltage application duration, is recommended. For safety considerations, and to avoid measuring stray currents, the leads may be shielded. 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.
Poluicao em Isoladores Artigos sobre Poluicao em Isoladores. To provide greater accuracy around the 1 min point and to allow the data to be plotted on log paper, it is also common to take readings at other intervals such as 15 s, 30 s, iese s, 1 min, 1.
Please ieee to your authorized 4-2013 account to use this feature. The difference in insulation resistance is high because of how resistance is calculated. This is particularly important in the case of small, low-voltage machines, or wet windings.
I T — Total current: Insulation resistance testing involves the application of high direct voltages to machine windings. The strategic plan of IEEE is driven by an envisioned future that realizes the full potential of the role IEEE plays in advancing technology for humanity.
The association is chartered under this name and it is the full legal name. The absorption current I A or polarization current decays at a ieee rate.