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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Normally a condition based maintenance strategy is Additional to above results, the dryness of winding applied for oec equipment with a high asset as insulation can be evaluated according to . Log In Sign Up. Skip to main content. Due to different polarization processes the resulting current decreases in dependence of the condition of the insulation system faster or slower.
The test setup is shown in figure 4. Accept and continue Learn more about the cookies we use and how to change your settings.
Testing Laboratory (QA and R&D)
Out of this reason it was Fig. With off-line one phase tests instead of three phases, three channels at different locations are used: This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3. The capacitive part normally can be neglected.
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Such PD systems can also be used in online monitoring systems with great advantages. This way PD faults can be seen and also located much easier. There were resoldered properly. 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. 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.
The origin of the strong partial discharges could be located with an ultrasonic receiver figure According to the standard the ratio between the resistance at end 10min and beginning 1min of the iecc should be greater than 2. Help Center Find new research papers in: 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 dielectric losses versus voltage characteristics of coil insulation are the result of several phenomena occurring in the insulation structure. Void ionisation is a form iev partial discharge.
BS EN 60034-18-34:2012
Test procedures for form-wound windings. When testing an domain spectroscopy FDS in the frequency domain. Evaluation of thermomechanical endurance of insulation systems. You may experience issues viewing this site in Internet Explorer 9, 10 or jec 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.
At first the polarization index PI is commonly used: 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. Dry and clean insulation systems have an essential higher PI than 2. The faulty coil could be found by detecting the 660894 current with a clamp-on ammeter figure IEC “Guide for a test procedure for the measurement of loss tangent of coils and bars for machine windings”.
The components of the total current were the sum of absorption, conduction, leakage and capacitance of the winding. 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.
EN “Test of insulation of bars and coils of high-voltage machines”. The maximum PD magnitude at line-to-ground voltage should be less than 50pC. 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.
And at least the absorption represents the polarization mechanism in the solid insulation To verify the dryness of the winding system a system. 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.