Примери за използване на Insulation defects на Английски и техните преводи на Български
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Classification of insulation defects in electri….
Insulation defects can usually be divided into two categories.
During this process, the insulation defects are detected.
As the main voltage in the alternating voltage by the voltage,it can effectively expose the equipment insulation defects.
Classification of insulation defects in electri… Navigation.
Please do the pressure test again if the instrument is over current protection by the reasons except the cable insulation defects.
Classification of insulation defects in electrical equipment.
Not yet breakdown but low resistance fault, for example, megger shows cable resistance is low, butunder operating voltage the insulation defects can not be breakdown.
Classification of insulation defects in electrical equipment[Oct 22, 2019].
(3) The AC withstand voltage test should be handled cautiously in the absence of insulation defects after other test items are completed;
Some of the insulation defects of electrical equipment are lurking during manufacturing, while others are developed under the influence of external influences during operation, that is, cumulative effects.
If other test items are completed andthe equipment is found to have insulation defects, it is not possible to rashly decide to communicate.
The test can be carry out during the transfer of major repairs, partial replacement of winding and other conventional test.0.1Hz Ultra-Low Frequency High Voltage Generator is more effective to test generator end insulation defects than other instrument.
In the case of insulation defects,  the pressure test shall be carried out after elimination, so as to avoid insulation  breakdown during the AC withstand voltage test,enlarge the insulation defects, prolong the inspection time and increase the maintenance workload.
The test voltage is higher than the actual operation of the test equipment may encounter over-voltage, rigorous test,can find a lot of insulation defects, in particular, can be found that the risk of greater concentration of defects. .
In summary, the DC withstand voltage test andpower frequency AC voltage test can effectively find the insulation defects, but each has its own characteristics, so the two methods can not replace each other, if necessary, should be carried out at the same time, complement each other.
Third, the preventive test of electrical equipment refers to the equipment put into operation, according to a certain period by the operating department, the test department conducted a test,the purpose is to check the operation of the equipment with or without insulation defects and other defects. .
Although insulation  resistance and absorption ratio test, leakage current and DC withstand voltage test anddielectric loss angle measurement test can find many insulation defects, but because the test voltage is lower than the working voltage of the test article, some insulation defects are not timely.
In the preventive test, after insulation  resistance test, absorption ratio test and leakage current measurement, DC withstand voltage test andother items are completed, although more insulation defects can be found, the test voltage is often lower than the working voltage of the test object.
Since the DC voltage is divided by the insulation  resistance,it is possible to find the end insulation defect more efficiently than the AC.
The higher the test voltage,the higher the effectiveness of the insulation defect, but the greater the likelihood that the test article will be broken down.
This paper summarizes some of the applications of HZ-E cable fault test bridge positioning cable insulation and sheath defects experience for the majority of peer reference.
Ideal if during the process of removing the secondary treatment the insulation core did not receive defects.
These devices and appliances operate with internal and external overvoltages that are much higher than the normal rated operating voltage,which can cause defects in the insulation structure and become latent faults.
After the insulation of the above two types of defects, its characteristics tend to change.
In order to further expose equipment defects, check the insulation level of the equipment, and determine whether it can be put into operation reliably, it is necessary to conduct AC withstand voltage test.
It was found that in order tofurther expose equipment defects, check the insulation level of electrical equipment and ensure that it can be put into operation, it is necessary to conduct AC withstand voltage test.
Thermography Inspections detail the areas of concern such as insulation  problems, air leaks, poor workmanship,structural defects, missing insulation, damage due to mould, moisture and condensation.
By measuring the full current and resistive current and other parameters,you can find the zinc oxide arrester internal insulation damp and valve flaws and other dangerous defects aging.
If the core wire is positive, the moisture penetrates into the lead package,the moisture in the insulation decreases, the leakage current decreases, and defects are not easily found.