IEEE Std ™ I. EEE Standards. TM. IEEE Guide for Field Testing of Shielded Power. Cable Systems Using Very Low. “IEEE Guide for Field Testing and Evaluation of the Insulation of Shielded Power IEEE “Guide for Testing of Shielded Power Cable Systems using Very. Guided IEEE Series (Bundle) Standards IEEE – • IEEE Guide for Field Testing of Shielded Power Cable Systems Using Very.
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If the test cable has a defect severe enough at the withstand test voltage, an electrical tree will initiate and grow in the insulation. Furthermore, the differences that have been identified are not statistically significant for the data available.
For example, some sites with high PD activity have not failed and there have been some failures at sites with little or no PD activity. Sufficient information is 040.2 to determine the desired percentiles selected for the critical levels. The change in the tangent delta with time at constant voltage increases with degree of aging of the insulation.
Figure ifee —Recommended test hook-up 5. More importantly, it must be understood that, for different insulations, installations, and cable types, tangent delta, differential tangent delta and tangent delta stability figures of merit can vary significantly from each other.
However, care should be exercised to make sure that unreasonably low or high values are not selected, e. It should be noted that Table 4 to Table 7 apply to maintenance tests on cable systems that have been in operation for five or more years, i. Should a local ground be advisable or recommended for the test equipment, case ground must remain connected to system ground in order to maintain an acceptable single ground potential. Negative slope loss decreasing with Isolated loss regions such as lossy accessories or heavily water length treed regions within a large proportion of low loss cable 5.
After the initiation of PDs PDIVan electrical tree may form that can develop into a breakdown channel within minutes. If filled, it is referred to as a filled XLPE.
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Test times and maximum voltages are recommended in Table 3. The guide does not focus on the effects of insulation materials parameters: Examples of the various waveforms shown in Annex B are as follows: A cable in which an insulated conductor is enclosed in a conducting envelope.
CAUTION The potential consequences of a cable system insulation failure during any high-voltage test should be considered prior to undertaking any such test. It is intended that the technique-specific guides provide the definitive information on voltages, times and criteria.
It is made available for a wide variety of both public and private ieee. Patents Attention is called to the possibility that implementation of this standard may require use of subject matter covered by patent rights. These test sets are acceptable to be used.
The values given in Table 4 to Table 7 can also be given in percentage, in which case the values are multiplied byfor example, 0. VLF ac voltage testing methods utilize ac signals at frequencies in the range of 0. Letters of Assurance may indicate whether the Submitter is willing or unwilling to grant licenses under patent rights without compensation or under reasonable rates, with reasonable terms and conditions that are demonstrably free of any unfair discrimination to applicants desiring to obtain such licenses.
When a document is more than ten years old and has not undergone a revision process, it is reasonable to conclude that its contents, although still of some value, do not wholly reflect the present state of the art. If this connection is missing or deteriorated, it must be replaced at this time.
The metallic shield of the cable to be tested is connected to system ground.
Generally, the measured loss is increased under this circumstance; however, the precise impact on the leee is not clear. Printed in the United States of America. In these cases, it is necessary to recognize the constraint of the Weibull approach in that it is designed to be applied to a single mode at a time.
Therefore it is necessary to segregate the complete datasets into smaller subgroups and then apply a distribution approach. The criteria used for the historical figures of merit provided in this document have been selected using the estimate of the 80th and 95th percentiles, not the lower confidence limits.
Electrical test methods for electric cables. The cable fault may be located with standard cable fault locating equipment.
VLF cable testing – Wikiwand
Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. These results may also be used to trigger further testing. Therefore, both the loss and capacitive currents can be plotted separately as a function of voltage and frequency.