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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Find Similar Items This product falls into the following categories. With the partial discharge PD measurement also single faults in the Figure 9 shows the test arrangement for insulation can be found.

A DC test voltage has to be applied as step function on the totally depolarized winding for the duration of 10 minutes. 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.

The repaired generator passed all tests measurements: Learn more about the cookies we use and how to change your settings. Out of this reason it was Fig. And at least the absorption represents the polarization mechanism in the solid insulation To verify the dryness of the winding system a system. The leakage portion represents the surface condition and humidity of the end windings.

You may experience issues viewing this site in Internet Explorer 9, 10 or The test requires an AC power source capable of supplying PD-free 50 or 60Hz variable voltage up to at least the rated line-to-ground voltage of the insulation system under test. Normally this measuring technology is used to Which information for the condition can we extract determine the water content of paper oil insulation form the results of insulation resistance systems used in transformers.

Normally a condition based maintenance strategy is Additional to above results, the dryness of winding applied for power equipment with a high asset as insulation can be evaluated according to [6]. Functional evaluation of insulation systems. 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.

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IEC/TR 60894:1987

According to the standard the ratio between the resistance at end 10min and beginning 1min of the measurement should be greater than 2. Funktionelle Bewertung von Isoliersystemen. IEC “Guide for a test procedure for the measurement of loss tangent of 60849 and bars for machine windings”.

With off-line one phase tests instead of three phases, three channels at different locations are used: The test setup is shown in figure iev. The capacitive part normally can be neglected.

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An innovative irc dielectric or partial discharges losses, or both with voltage. The PI can be calculated from the polarisation currents for 60s and s. This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3.

When testing an domain spectroscopy FDS in the frequency domain. Such PD systems can also be used in online monitoring systems with great advantages.

For these tests there were some routines R10 insulation resistance after 10 minutes and standard procedures and test equipment used. Measurement results can help to improve the system design or can help researches in finding suitable insulation materials.

The stator windings were cleaned but the losses were still high.

Due to different polarization processes the resulting current decreases in dependence of the condition of the insulation system faster or slower. It was detected that some of the soldered coil connections were broken. But the losses are still high in comparison to the phases S and T. You may find similar items within these categories by selecting from the choices below:.

Partial Discharge measurements are taken in voltage steps up to the rated line-to-ground voltage of the insulation system to measure the discharge inception voltage DIV and the discharge extinction voltage DEV.

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The dielectric losses versus voltage characteristics of coil insulation are the result of several phenomena occurring in the insulation structure. ICMflex connected to a single stator bar under test. Dry and clean insulation systems have an essential higher PI than 2. A winding resistance measurement was made figures 13 and Your basket is empty.

Evaluation of thermomechanical endurance of insulation systems Status: Common practise for the insulation diagnosis is the measurement of the Polarisation Index PIthe measurement of the capacitances and dielectric losses and the measurement of partial discharges PD.

Void ionisation is a form of partial discharge. Recurring diagnostic measurements on the electrical insulation of stator and rotor are important to ensure the safe operation and prevent unexpected outages and serious failures.

Both methods deliver results which are individual coil or bar, this change in power factor comparable.

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In the paper the new methods of insulation testing and monitoring are described and the advantages of these tools are illustrated with practical case studies. Some areas showed higher temperatures than the average. There were resoldered properly. Click here to sign up. The origin of the strong partial discharges could be located with an ultrasonic receiver figure This way PD faults can be seen and also located much easier.

The maximum PD magnitude at line-to-ground voltage should be uec than 50pC. 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.

At second the value of the insulation resistance is an absolute criterion for the quality and the global condition. The advantages and disadvantages of with the test voltage may be caused iev either a variation in the power factor values associated with these methods were discussed in [7]. At V a breakdown occurred after 10s figure

Last modified: December 27, 2019