Electrical aging and electroluminescence in epoxy under repetitive voltage surges

Stone, G.C.; Heeswijk, R. G. van; Bartnikas, R.

doi:10.1109/14.135595

Cited by 52 publications

(14 citation statements)

References 13 publications

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“…Polarity and increases in major factors such as repetition rate and voltage magnitude all result in a decrease in the life of the insulation, with the voltage magnitude having the most detrimental impact and the repetition rate the least [10]. However when more than one factor is changed, they can collectively negate the influences of each other, which can lead to longer insulation life [10]. An increase in the impulse voltage magnitude results in the pd inception voltage being exceeded, initiating pd activity and tree inception [9].…”

Section: Impact Of Power Quality On Insulation Ageingmentioning

confidence: 98%

“…Positive polarity surges have been found to be more damaging than negative, irrespective of the level of moisture present. However only the negative surges produced electroluminescence [10]. There has been no link yet established with insulation life or the number of impulses to failure.…”

Section: Impact Of Power Quality On Insulation Ageingmentioning

confidence: 98%

“…It has been suggested that the cumulative effect leads to injection and accumulation of space charge creating conditions to facilitate tree inception and that higher stresses create a shorter inception periods [9]. Polarity and increases in major factors such as repetition rate and voltage magnitude all result in a decrease in the life of the insulation, with the voltage magnitude having the most detrimental impact and the repetition rate the least [10]. However when more than one factor is changed, they can collectively negate the influences of each other, which can lead to longer insulation life [10].…”

Section: Impact Of Power Quality On Insulation Ageingmentioning

confidence: 99%

See 2 more Smart Citations

The Relationship Between Insulation Ageing and Power Network Performance

Bahadoorsingh

Rowland

2007

2007 IEEE International Conference on Solid Dielectrics

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A framework has been developed which links the reliability of insulation and plant to changes in their operating environment. These changes include nonpower frequency events such as harmonics and the occurrence of impulses. This work is driven by the new demands put on real networks as a result of changing loads and renewable and distributed generation. The framework presented allows a coherent view of the interaction between models of failure mechanisms and network performance. Such a framework allows a clear interface between system analysts and plant engineers. It provides a platform for integrated asset management using existing knowledge of dielectric ageing mechanisms and condition monitoring. It will also provide a framework for future research in the area.

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Section: Impact Of Power Quality On Insulation Ageingmentioning

confidence: 98%

Section: Impact Of Power Quality On Insulation Ageingmentioning

confidence: 98%

Section: Impact Of Power Quality On Insulation Ageingmentioning

confidence: 99%

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The Relationship Between Insulation Ageing and Power Network Performance

Bahadoorsingh

Rowland

2007

2007 IEEE International Conference on Solid Dielectrics

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“…Although natural UV radiation itself can cause photoionization, it is insignificant to the overall degradation of the insulation system compared to effects from electrical discharges [7], [8]. Use of corona-imaging instrument sensitive to UV radiation eliminates the need for complete darkness during quality control inspection.…”

Section: Introductionmentioning

confidence: 99%

Black-Out Test Versus UV Camera for Corona Inspection of HV Motor Stator Endwindings

Stranges

Haq

Dunn

2014

IEEE Trans. on Ind. Applicat.

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As part of a factory acceptance test program for highvoltage (HV) motors, end users sometimes specify a black-out test. This is a traditional offline inspection where the stator is placed in complete darkness, each phase is energized to 115% of rated line-to-neutral voltage, and both ends of the stator are observed to determine the presence, location, and severity of endwinding surface partial discharges (PDs). The setup for the test may be complex and risky due to the need for observers to be standing in darkness close to the energized parts of the stator. The test results are qualitative and strongly depend on the observer's eyesight and individual perception. A safer and more accurate alternative is to use an ultraviolet (UV) camera or viewer. The observed PD activity may be observed in ambient lighting, recorded, and quantified through simultaneous offline PD measurements. This paper describes the two inspection techniques and presents experimental validation of the UV corona camera inspection method as a suitable replacement for a black-out test. Sample 13.8-kV coils were wound in a fixture simulating their relationship in a stator winding and subjected to high-potential tests while observed under black-out conditions and with a UV corona camera in ambient lighting. The stator windings from two HV compressor motors were inspected using the same camera. Recorded images of the observed discharges and measured PD activity in the sample coils and stator winding were used to compare the evaluation by each test method.

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“…PCBs are increasingly exposed to voltage surges from lighting, switching and circuit breaker operation [7]. Voltage surges are known to be one of the factors leading to tracking failure [8].…”

Section: Introductionmentioning

confidence: 99%

Effects of low pressure on tracking failure of printed circuit boards

Liu

2008

IEEE Trans. Dielect. Electr. Insul.

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In general, printed circuit boards (PCBs) used in power devices and system operation in low pressure environments are more susceptible to damage from surface discharges. Additionally, repetitive operation of power systems is an important factor leading to tracking failure. Whether the tracking phenomenon at low pressures is different from that at atmospheric pressure needs better understanding to ensure reliable applications. In this paper, studies of tracking failure of PCBs in a low-pressure chamber, are reported for an electrode configuration comprising a pointed end of track close to the side of a track. Test samples were made by printing these tracks onto a glass-cloth epoxy-resin laminate. Experiments were carried out using repetitive unipolar pulses to simulate voltage surges. The ambient pressure was reduced from atmospheric pressure to a very low pressure (0.6 kPa). The time to failure and the cumulative charge passing before failure were recorded as function of the pressure, temperature, pulse interval and insulation distance. The results obtained indicate that the low pressure enhances the breakdown endurance of PCBs and the breakdown phenomena at low pressure are different from those at atmospheric pressure. With the decrease of the pressure, the cumulative charge is increased but the tracking failure is delayed. At low pressures, increasing temperature has little effect on the cumulative charge, but has significant influence on the time to tracking failure.

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Electrical aging and electroluminescence in epoxy under repetitive voltage surges

Cited by 52 publications

References 13 publications

The Relationship Between Insulation Ageing and Power Network Performance

The Relationship Between Insulation Ageing and Power Network Performance

Black-Out Test Versus UV Camera for Corona Inspection of HV Motor Stator Endwindings

Effects of low pressure on tracking failure of printed circuit boards

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