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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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. The PI can be calculated from the polarisation currents for 60s and s. The origin of the strong partial discharges could be located with an ultrasonic receiver figure 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.

Evaluation of thermomechanical endurance of insulation systems. 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. With the partial discharge PD measurement also single faults in the Figure 9 shows the test arrangement for insulation can be found. IEC “Guide for a test procedure for the measurement of loss tangent of coils and bars for machine windings”.

EN “Test of insulation of bars and coils of high-voltage machines”. 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.

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Additionally multi-frequency PD measurement systems allow for pulse shape analysis.

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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. It was detected that some of the soldered coil connections were broken. Take the smart route to manage medical device compliance. The advantages and disadvantages of with the test voltage may be caused by either a variation in the power factor values associated with these methods were discussed in [7].

Remember me on this computer. The insulation current at s is 10 times lower than before drying. Dry and clean insulation systems have an essential higher PI than 2. Due to different polarization processes the resulting current decreases in dependence of the condition of the insulation system faster or slower.

At V a breakdown occurred after 10s figure The leakage portion represents the surface condition and humidity of the end windings. When testing an domain spectroscopy FDS in the frequency domain. 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. Connection Iex with ICMflex.

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IEC/TR 60894:1987

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. Please download Chrome or Firefox or view our browser tips.

Table 1 figure 24 of the FDS before 6894, after drying and shows all results of dielectric 608944 after repair. According to the standard the ratio between the resistance at end 10min and beginning 1min of the measurement should be greater than 2.

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

The test setup is shown in figure 4. The result can be shown in the frequency or time domain figures 2 and 3 [8]. 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].

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We use cookies to make our website easier ie use and to better understand your needs. Two methods are measurements? But the losses are still high in comparison to the phases S and T. The results are shown in figures 10 and But also this result had Fig. The faulty coil could be found by detecting the fault current with a clamp-on ammeter figure Help Center Find new research papers in: The quality of the stator winding insulation system should be verified according to the following brief description of the test procedure.

You may experience issues viewing this site in Internet Explorer 9, 10 or A winding resistance measurement was made figures 13 and 6894 to main content.

An innovative the dielectric or partial discharges losses, or both with voltage. ICMflex connected to a single stator bar under test. 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. Click to learn more.

For these tests there were some routines R10 insulation resistance after 10 minutes and standard procedures and test equipment used. The 50Hz dissipation factor of phase R was W 3.

Out of this reason it was Fig. The components of the total current were the sum of absorption, conduction, leakage and capacitance of the winding.

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