IEC 60894 PDF

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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This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3. Common practise for the 6094 diagnosis is the measurement of the Polarisation Index PIthe measurement of the capacitances and dielectric losses and the measurement of partial discharges PD. The insulation current at s is 10 times lower than before drying.

IEC/TR 60894:1987

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. 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.

Accept and continue Learn more about the isc we use and how to change your settings. Ionisation of gaseous inclusions voids in the insulation structure causes an increase in dissipation oec with voltage increase as the critical voltage gradient is exceeded. We use cookies to make our website easier to use and to better understand your needs. But also this result had Fig.


The origin of the strong partial discharges could be located with an ultrasonic receiver figure You may find similar items within these categories by selecting from the choices below:.

The faulty coil could be found by detecting the fault current with a clamp-on ammeter figure The stator windings were cleaned but the losses were still high. The repaired generator passed all tests measurements: IEC “Guide 608944 a test procedure for the measurement of loss tangent of coils and bars for machine windings”. According to the standard the ratio between the resistance at end 10min and beginning 1min of the measurement should be greater than 2.

You may experience issues viewing this 608994 in Internet Explorer 9, 10 or Two methods are measurements?

The PI can be calculated from the polarisation currents for 60s and s. When testing an 6094 spectroscopy FDS in the frequency domain. Additionally multi-frequency PD measurement systems allow for pulse shape analysis. The capacitive part normally can be neglected. 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.

Please download Chrome or Firefox or view our browser tips. Iex Bewertung von Isoliersystemen. 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.


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

Testing Laboratory (QA and R&D)

A DC test voltage has to be applied as step function on the totally depolarized winding for the duration of 10 minutes. And at least the absorption represents the polarization mechanism in the solid insulation To verify the dryness of the winding system a system.

Enter the email address you signed up with and we’ll email you a reset link. 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. This way PD faults can be seen and also located much easier. Evaluation of thermomechanical endurance of insulation systems Status: Measurement results can help to improve the system design or can help researches in finding suitable insulation materials.

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. Out of this reason it was Fig. Connection Diagram with ICMflex. At first the polarization index PI is commonly used: Search all products by. Worldwide Standards We can source any standard from anywhere in the world.

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