Application of advanced after-laying test to long-distance 275 kV XLPE cable lines

Ōta, Hiroshi; Ichihara, Masaki; Miyamoto, N.; Kitai, S.; Maruyama, Yoshinobu; Fukasawa, M.; Takehana, H.

doi:10.1109/61.400876

Cited by 18 publications

(6 citation statements)

References 5 publications

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“…The second channel is attached to a probe, which is capturing the noise pulses, but as little as possible of the PD. On occurrence of a noise pulse at the gating channel, the primary channel is blocked for a short period of time [5,35]. The effectiveness of the method depends on the ability to establish a reliable gating signal and the total length of disturbed time periods.…”

Section: Noise Gatingmentioning

confidence: 99%

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Discrimination between internal PD and other pulses using directional coupling sensors on HV cable systems

Pommerenke

Strehl

Heinrich

et al. 1999

IEEE Trans. Dielect. Electr. Insul.

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On-site partial discharge (PD) measurement is required to ensure proper installation of extra high voltage (EHV) cable systems accessories. To achieve high sensitivity and good localization, two problems have to be overcome. First, the strong high frequency attenuation in long XLPE cables requires that the sensors be located along the cable, preferably directly at the accessories. Secondly, the detection system must be able to distinguish internal PD from other pulses. This paper describes a solution based on directional coupling sensors and a data visualization system, which displays phase-amplitude diagrams for individual PD sources which are identified by the direction of pulse propagation. It has been applied to on-site measurements, type and routine testing of HV cable joints and stress cones. Due to the reliable discrimination between internal PD from the accessory measured and from other pulses, testing can be done in unshielded rooms even using terminations with internal PCI and corona. The method works independently well on line voltage, resonance sources, oscil1,ating voltages and 0.1 Hz. cosine-square voltage. It has been used to verify the cable accessories installed in the 6.3 km long 380 kV cable system in Berlin, Germany

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Section: Noise Gatingmentioning

confidence: 99%

“…Usually the capacitive electrodes are placed above the semicon layers, but it is also possible to use the stress cones or the semicon layers around a joint as pick-up electrodes. A dual capacitive pick-up [lo, 15,21,34,35] allows discriminating noise from critical PD. This topology is analyzed further in this paper.…”

Section: Capacitive Couplingmentioning

confidence: 99%

Discrimination between internal PD and other pulses using directional coupling sensors on HV cable systems

Pommerenke

Strehl

Heinrich

et al. 1999

IEEE Trans. Dielect. Electr. Insul.

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“…If it is the aim to detect PD occurring in the cable itself, detection techniques operating in a frequency range of not more than a few MHz have to be utilized due to the high attenuation at higher frequencies in shielded polymer insulated cables [4,5]. The high interference level in this frequency range requires sophisticated methods for noise suppression [6,7]. However, due to recent advances in cable manufacturing technology it has been generally recognized that the PD in cable insulation itself is no longer a major threat.…”

Section: Introductionmentioning

confidence: 99%

A novel calibration method for PD measurements in power cables and joints using capacitive couplers

Zhong

Chen

Yang

2004

Meas. Sci. Technol.

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Partial discharge (PD) measurements are universally accepted as a technique giving some indication of the state of the insulation in high-voltage apparatus. Cable end users are keen to adopt online PD monitoring during commissioning of systems. However, because of noisy environments and the problems of interference the conventional methods are difficult to implement. As a consequence, ultra-high frequency (UHF)/very high frequency (VHF) techniques of on-site detection of partial discharges have been developed. A technique based on capacitive coupling has received much attention. It has been demonstrated that it is possible to use the technique to monitor the partial discharge in cables, particularly in joints/terminations. However, in order to obtain quantitative information about PD, calibration is required for this technique. Existing calibration methods are difficult to implement on-site. In this paper, a novel method is proposed and compared with the conventional method on a short piece of cable. It has been shown that an individual capacitive coupler can also be accurately calibrated on-site and online using the new method, therefore it provides quantitative information about the amount of apparent discharge. In practice, this is important for electricity utilities as the quantitative information about PD can be used to determine the quality of the cable system and to decide whether the system needs to be repaired or replaced.

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“…Data acquisition for PD detection in cable systems usually involves non-conventional electrical coupling techniques including coaxial cable sensors [2]; inductive high frequency current transformers (HFCT) either around the cable itself [3] or the earth connection [4]; screen interruptions [5]; directional couplers [6]; and foil electrodes on cable joints [7]; as well as acoustic emission (AE) technique [8]. The electrical coupling techniques work on various frequencies, ranges from a few MHz to several hundred MHz.…”

Section: Pd Signal Acquisition and Transmission Methodologiesmentioning

confidence: 99%

“…However, either optical transmitter or acquisition unit with digitizer and communication port requires power supply to operate, although they can work on battery power for a few hours. Though there have been experiences of after-laying PD tests for practical long cable circuits [2,6,7], so far there are few experiences of continuous PD monitoring for practical underground cable circuits especially where mains supply is not available.…”

Section: Pd Signal Acquisition and Transmission Methodologiesmentioning

confidence: 99%

Continuous on-line monitoring of partial discharges in high voltage cables

Tian

Lewin

Wilkinson³

et al.

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation

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This paper reviews data acquisition, transmission and processing methodologies for continuous online monitoring of partial discharges in power cable systems. A PD continuous online monitoring system for underground cable circuits using capacitive couplers, LiNbO 3 electro-optic modulators, laser, optical switch and optical fibers has been proposed. Data processing methods include pulse shape and spectrum analysis, time of flight analysis, phase-resolved two-dimensional histograms, three-dimensional ϕ-q-n patterns, trend analysis, wavelet-based denoising, alarm strategy and telecommunication function to enable remote control and data download.

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Application of advanced after-laying test to long-distance 275 kV XLPE cable lines

Cited by 18 publications

References 5 publications

Discrimination between internal PD and other pulses using directional coupling sensors on HV cable systems

Discrimination between internal PD and other pulses using directional coupling sensors on HV cable systems

A novel calibration method for PD measurements in power cables and joints using capacitive couplers

Continuous on-line monitoring of partial discharges in high voltage cables

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