IEC 60894 PDF

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Buy IEC/TR Ed. Guide for test procedure for the measurement of loss tangent of coils and bars for machine windings from SAI Global. IEC Empirical limits of these three parameters, verified in practice, may be used as a basis for evaluating the quality of stator winding. Apply low or high voltage to measure Moderate Moderately effective to find thermal IEEE or insulation loss or water leak problems IEC Power factor.

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The dielectric losses versus voltage characteristics of coil insulation are the result of several phenomena occurring in the insulation structure. Evaluation of thermomechanical endurance of insulation systems Status: With off-line one phase tests instead of three phases, three channels at different locations are used: The leakage portion represents the surface condition and humidity of the end windings.

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Rotating electric machines, Electric machines, Electrical equipment, Electrical insulation, Electrical insulating materials, Electrical insulation devices, Endurance testing, Ageing materialsAgeing tests, Heat ageing tests, Thermal testing, Thermal-cycling tests, Windings, Performance, Performance testing, Sampling equipment.

Due to different polarization processes the resulting current decreases in dependence of the condition of the insulation system faster or slower. The components of the total current were the sum of absorption, conduction, leakage and capacitance of the winding.


Innovative tools like the dielectric response analysis or the partial discharge measurement with synchronous multi- channel systems enable a more detailed analysis of the insulation quality and the location of faults.

ICMflex connected to a single stator bar under test. You may find similar items within these categories by selecting from the choices below:. A DC test voltage has to be applied as step function on the totally depolarized winding for the duration of 10 minutes. According to the standard the ratio between the resistance at end 10min and beginning 1min of the measurement should be greater than 2.

Most suppliers of rotating machines and motors apply partial discharge and loss factor measurements in-line with their quality assurance program and final acceptance tests.

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This way PD faults can be seen and also located much easier. An innovative the dielectric or partial discharges losses, or both with voltage. The insulation current at s is 10 times lower than before drying. Measurement results can iecc to improve the system design or can help researches in finding suitable insulation materials.

The repaired generator passed all tests measurements: With the iex discharge PD measurement also single faults in the Figure 9 shows the test arrangement for insulation can be found. Take the smart route to manage medical device compliance.

Here the difference between each two results at 0,2; 0,4; 0,6; 0,8 and 1,0 times the test voltage is recorded. And at least the absorption represents the polarization mechanism in the solid insulation To verify the dryness of the winding system a system. The aim of the technical time constant of the insulation system can be diagnostics is to detect any anomalies of the electric calculated by the product of the insulation resistance insulation system. Some areas showed higher temperatures than the average.


Functional evaluation of insulation systems. Test procedures for form-wound windings. Help Center Find new research papers in: The test setup is shown in figure 4.

Worldwide Standards We can source any standard from anywhere in the world. Search all products by. The result can be shown 6084 the frequency or time domain figures 2 and 3 [8]. A winding resistance measurement was made figures 13 and The stator windings were cleaned but the losses were still high.

IEC/TR 60894:1987

Dry and clean insulation systems have an essential higher PI than 2. The results are shown in figures 10 and Additionally multi-frequency PD measurement systems allow for pulse shape analysis. But the losses are still high in comparison to the phases S and T.

The PI can be calculated from the polarisation currents for 60s and s. It was detected that some of the soldered coil connections were broken. Click to learn more. Void ionisation is a form of partial discharge.

With PD systems which can measure simultaneously at different points, different PD sources can be separated from each other and ic interference.