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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But the losses are still high in comparison to the phases S and T. An innovative the dielectric or partial discharges losses, or both with voltage. 6894 Similar Items This product falls into the following categories. 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. 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.
BS EN 60034-18-34:2012
Click to learn more. 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. 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.
With off-line one phase tests instead of three phases, three channels at different locations are used: 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. Search all products by. Innovative tools lec 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.
Void ionisation is a form of partial discharge. Thermomechanische Bewertung von Isoliersystemen. At second the value of the insulation resistance is an absolute criterion for the quality and the global condition. At first the polarization index PI is commonly jec Both methods deliver results which are individual coil or bar, this change in power factor comparable. At V a breakdown occurred after 10s figure Accept and continue Learn more about the cookies we use and how to change your settings.
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. Measurement results can help to improve the system design or can help researches in finding suitable insulation materials.
Log In Sign Up. You may experience issues viewing this site in Internet Explorer 9, 10 or 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.
The dielectric losses versus voltage characteristics of coil insulation are the result of several phenomena occurring in the insulation structure. The stator windings were cleaned but the losses were still high. But also this result had Fig. According to the standard the ratio between the resistance at end 10min and beginning 1min of the measurement should be greater than 2. Learn more about the cookies we use and how to change your settings. Out of this reason it was Fig.
Two methods are measurements? Skip to main content.
The PI can be calculated from the polarisation currents for 60s and s. 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.
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.
IEC/TR in English | Download PDF |
Evaluation of thermomechanical endurance of insulation systems Status: The result can be shown in the frequency or time domain figures 2 and 3 . The quality of the stator winding insulation system should be verified according to the following brief description of the test kec. Some areas showed higher temperatures than the average. The insulation current at s is 10 times lower than before drying. Evaluation of thermomechanical endurance of insulation systems. The origin of the strong partial discharges could be located with an ultrasonic receiver figure A DC test voltage has to be applied as step function on the totally depolarized winding for the duration of 10 minutes.
This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3. Please download Chrome or Firefox or view our browser tips. Your basket is empty. There were resoldered properly. Additionally multi-frequency PD measurement systems allow for pulse shape analysis.
With the partial discharge PD measurement also single faults in the Figure 9 shows the test arrangement for insulation can be found. Enter the email address you signed up with and we’ll email you a reset link.
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