detection of initial failure in high-voltage insulation.
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detection of initial failure in high-voltage insulation. by M. R. Shaw

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Published in Baltimore .
Written in English


  • Electric insulators and insulation

Book details:

Edition Notes

Thesis, Ph.D. Johns Hopkins University.

The Physical Object
Pagination6 p.
ID Numbers
Open LibraryOL16534835M

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– Characteristic Time to Failure • Scale Factor/ % probability of failure • Shape parameter/slope of failure times • Called two parameter Weibull distribution • Controversial: “Most physical models do predict this type of distribution for failure as a function of time (but not necessarily of voltage stress”). A New Concept for Online Surge Testing for the Detection of Winding Insulation Deterioration in Low-Voltage Induction Machines November IEEE Transactions on Industry Applications 47(5) FAILURES in electrical insulation are considered as one of the main causes of forced disconnection of high voltage electrical equipment [1] [2].In this sense, the problems that may arise in. A failure in the motor insulation leads to its immediate unavailability, causing production stops, undesirable financial losses and, in some cases, high maintenance costs. To identify low insulation resistance in the stator of low and medium voltage (LV, MV) IMs, preventive tools have been applied only during scheduled shutdowns of the machine Cited by: 7.

Initial examination and documenting the failure in as-received condition, common for all of these, is very critical and should be done. For capacitors, typically high leakage or short condition results from either dielectric compromise or bridging across the positive and negative terminals, what causes this and how it occurs varies for the. Partial Discharge Theory and Applications to Electrical Systems Gabe Paoletti, P.E. Alex Golubev, PhD Division Application Engineer Manager, R&D, Predictive Diagnostics relationship to early detection of insulation deterioration is required to properly evaluate this and can result in eventual complete insulation Size: 1MB. Finding the root cause of cable failures can lead to better maintenance practices and produce more reliable operation in the future. This in turn will lead to lower operating costs. As an example, the final result of a cable failure may be that the insulation failed and the cable flashed over. Research from the IEEE Gold Book, Ta indicates that cables, switchgear, and transformers suffer the greatest losses from insulation failure. For more than 50 years, companies have performed Partial Discharge Testing on electrical assets as part of ongoing predictive maintenance programs.

High voltage insulation is one of the main areas of pulsed power research and development, and dielectric breakdown is usually the limiting factor in attaining the highest possible performance in pulsed power devices. For many applications the delivery of pulsed power into a vacuum region is the most critical aspect of operation. The increase in the internal temperature of high voltage electrical instruments is due to a variety of factors, particularly, contact problems; environmental factors; unbalanced loads; and cracks in the high voltage current transformers, voltage transformers, insulators, or terminal junctions. This increase in the internal temperature can cause unusual disturbances and damage to high voltage. In Manitoba Hydro completed construction of a new high voltage test facility (HVTF) housing two test laboratories; the Bill McDermid High Voltage Test Hall, for testing kV transmission class apparatus, and an Insulating Materials Test Lab for performing diagnostic tests on electrical insulation systems and insulating materials. This high-voltage system connected to the insulation monitoring circuit can be modeled as an equivalent circuit, as illustrated in Figure 4, where Vb is the voltage of the high-voltage battery pack, Va is the voltage of the two- or three-phase AC source or AC machine, the inverter/converter block is the power electronic circuit used to convert power between the AC and DC power stages, and Vg Cited by: 1.