Effect of DC testing water tree deteriorated cable and a preliminary evaluation of VLF as alternate

Eager, G. S.; Fryszczyn, B.; Katz, C.; ElBadaly, H.A.; Jean, A.R.

doi:10.1109/61.141878

Cited by 15 publications

(4 citation statements)

References 8 publications

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“…Alternative testing techniques are therefore needed in order to overcome the disadvantages of current dc HV tests. The very low-frequency voltage between power frequency and dc, such as 0.1 Hz, is often used in HV testing of power cables [12,13]. However, the frequency dependence of space charge under 0.1 Hz ac voltage is not yet clear.…”

Section: Introductionmentioning

confidence: 99%

Space charge characteristics in cross-linking polyethylene under electrical stress from dc to power frequency

Wang¹,

Yoshimura²,

Tanaka³

et al. 1998

J. Phys. D: Appl. Phys.

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The space charge characteristics in cross-linking polyethylene (LPE) are investigated under various electrical stresses from dc to power frequency. The pulsed electro-acoustic method is improved to meet the needs of measurement under ac voltages. The frequency and phase angle dependences of the space charge are studied by means of phase-locking and frequency-converting techniques. Test results show that space charge can develop and accumulate in LPE under an ultralow frequency voltage. The critical frequency of the applied ac voltage is less than 0.02 Hz. The mechanism of the formation of space charge in LPE under an ac voltage is discussed through degassing of a sample in vacuum.

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Section: Introductionmentioning

confidence: 99%

Space charge characteristics in cross-linking polyethylene under electrical stress from dc to power frequency

Wang¹,

Yoshimura²,

Tanaka³

et al. 1998

J. Phys. D: Appl. Phys.

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show abstract

“…The suitability, practicality, and effectiveness of the testing method for service-aged power cables with extruded dielectric insulation will have to be determined based on several criteria: 1. At what voltage level can a defect be detected?…”

Section: Discussionmentioning

confidence: 99%

“…A comparison of dc, ac (at powerline frequency), and VLF (0.1 Hz sinusoid) testing of cables with PE and XLPE-type insulation by Groenefeld [6] and von Olshausen [7] showed that, due to a space charge build-up around defects in PE and XLPE insulation, (1) dc testing is inadequate in determining the In contrast, when comparing a sinusoidal 0.1 Hz with a 50 Hz test voltage, the previously mentioned researchers found that the greater the severity of the fault or damage to the insulation, the lower the voltage level at which a partial discharge or a defect breakdown occurred.…”

Section: Comparing DC Ac and Vlfmentioning

confidence: 99%

Field testing of HV power cables: understanding VLF testing

Gnerlich¹

1995

IEEE Electr. Insul. Mag.

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“…With the mass production of XLPE cable, the requirement for the HV testing system is increasing. Compared with the direct current (DC) HV test system, the very low frequency (VLF) HV test system that was proposed in [1][2][3] does not accumulate charge in the insulation layer or damage the insulation of the cable. Considering the advantages in the volume, weight, and energy consumption of VLF HV test systems over power frequency HV test equipment, the VLF testing concept was adopted as a standard by the European Union in 1996 and by the International Electrotechnical Commission (IEC) in 2006 (IEC60060- .…”

Section: Introductionmentioning

confidence: 99%

Topology and control design of a sinusoidal very low frequency high voltage generator

Liu¹

2013

Turk J Elec Eng & Comp Sci

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Abstract:To reduce the volume and the structural complexity of a very low frequency (VLF) high voltage (HV) generator, this paper introduces a novel sinusoidal VLF HV generator with 2 high frequency HV (HFHV) transformers and 2 metal-oxide semiconductor field-effect transistor cascaded HV bridge arms. Series-parallel resonant converter technology is applied to reduce the impact of the distributed parameters, decreasing the power loss and the volume of the transformer. Both the switching frequency and the duty cycle are utilized as actuating variables to cope with the large ranges of output. Simultaneously, the principle of segmental data processing is proposed to obtain different steadystate operating points, greatly reducing the calculation of the microcontroller unit (MCU), improving the accuracy of the control strategy, and the system response time. As a result, the control strategy is successfully achieved by the MCU dsPIC33FJ128MC706. The test of the 35 kV/0.1 Hz VLF HV power supply is taken on a capacitor (1.5 µ F), which is equivalent to the cross-linked polyethylene cable in the electrical characteristics. When the input voltage varies between 180 V and 250 V, the accuracy of the sinusoidal VLF HV is 2%. The step change response time is less than 120 µ s when the output changes from no-load to full-load. The total harmonic distortion is less than 1%, which meets the IEEE400.2 standard well. The total weight of the generator is less than 20 kg. The results of the experiment verify the accuracy and feasibility of the control theory and the topology.

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Effect of DC testing water tree deteriorated cable and a preliminary evaluation of VLF as alternate

Cited by 15 publications

References 8 publications

Space charge characteristics in cross-linking polyethylene under electrical stress from dc to power frequency

Space charge characteristics in cross-linking polyethylene under electrical stress from dc to power frequency

Field testing of HV power cables: understanding VLF testing

Topology and control design of a sinusoidal very low frequency high voltage generator

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