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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You may experience issues viewing this site in Internet Explorer 9, 10 or With the partial discharge PD measurement also single faults in the Figure 9 shows the test arrangement for insulation can be found.
Search all products by. The quality of the stator winding insulation system should be verified according to the following brief description of the test procedure.
Due to different polarization processes the resulting current decreases in dependence of the condition of the insulation system faster or slower.
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. 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. Connection Diagram with ICMflex.
Ionisation of gaseous inclusions voids in the insulation structure causes an increase in dissipation factor with voltage increase as the critical voltage gradient is exceeded. It was detected that some of the soldered coil connections were broken. But also this result had Fig. The capacitive part normally can be neglected. With off-line one phase tests instead of three phases, three channels at idc locations are used: Accept and continue Learn more about the cookies we use and how to change your settings.
An innovative the dielectric or 68094 discharges losses, or both with voltage. 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.
The maximum PD magnitude at line-to-ground voltage should be less than 50pC. The test setup is shown in figure 4. There were resoldered properly.
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At second the value of the insulation resistance is an absolute criterion for the quality and the global condition. A DC test voltage has to be applied as step function on the totally depolarized winding for the duration of 10 minutes. At V a breakdown occurred after 10s figure EN “Test of insulation of bars and coils of high-voltage machines”. 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 .
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The repaired generator passed all tests measurements: Click to learn more. Out of this reason it was Fig. Table 1 figure 24 of the 608994 before drying, after drying and shows all results of dielectric response after repair. Measurement results iecc help to improve the system design or can help researches in finding suitable insulation materials.
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. Find Similar Items This product falls into the following categories.
For these tests there were some routines R10 insulation resistance after 10 minutes and standard procedures and test equipment used. Two methods are measurements? 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. Click here to sign up. Evaluation of thermomechanical endurance of insulation systems Status: ICMflex connected to a single stator bar under test.