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ABSTRACT: We have developed a partial discharge measurement and analysis system using a personal computer, which allows one to obtain reproduced partial discharge pulse data with the phase information in an applied alternating current voltage and the number of cycles. For the CIGRE method II electrode system using 0.1 mm thick polyethylene film, temporal changes of partial discharge characteristics were measured up to breakdown of the sample. The average inception phase theta inc was proposed as a new statistical partial discharge parameter, which was obtained by making use of the capability of the time-sequential partial discharge data acquisition of our system; theta inc is defined as the average of theta inc of the number of cycles in a measurement; theta inc is a phase at which the first partial discharge pulse occurs in the half cycle after the polarity reversal of the previous partial discharge pulses. The experimental results revealed that the partial discharge pulse occurrence phase distribution ( phi -q-n distribution) exhibited a good correlation with ageing time. It was suggested that theta inc is a candidate signal for diagnosis of insulation performance of the system from the initial to middle degradation stage. We also discuss the physics of the temporal change of the phi -q-n distribution and theta inc as the ageing process proceeded.
Journal of Physics D Applied Physics 12/1998; 27(6):1220. · 2.54 Impact Factor
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ABSTRACT: Using MGI (metal-gap-insulator) and IGI (insulator-gap-insulator)
electrode systems with 0.1 mm- or 4.0 mm-thick LDPE samples, we studied
the temporal change of PD characteristics. The PD pattern and
statistical parameter (PD inception phase) changed with aging time. The
IGI electrode system showed a similar change in PD pattern with
degradation to that of the MGI electrode system. The PDs in MGI
electrodes with the 4.0 mm-thick sample showed new PD characteristics
which were absent in the 0.1 mm-thick sample. This was attributed to pit
formation just before breakdown. There results suggest the possibility
of insulation diagnosis from the beginning to the last stage of PD
degradation
Conduction and Breakdown in Solid Dielectrics, 1998. ICSD '98. Proceedings of the 1998 IEEE 6th International Conference on; 07/1998
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ABSTRACT: The authors have constructed a prototype of partial discharge (PD)
pulse measurement and degradation diagnosis system (PDMES-I). PDMES-I
consists of PD measurement system, PD pulse data analyzing system and
degradation system. The PD patterns (φ-q-n distribution) of low
density polyethylene (LDPE) and polyimide (PI) have been measured for
CIGRE METHOD-II electrode system. On the basis of the experimental
results, a model for a PD occurrence pattern of a half cycle is
proposed. We have made an artificial PD pattern by computer simulation
on the basis of the model. Finally, we have applied the artificial PD
patterns to the actual patterns to determine the degree of in the
Insulator-Gap-Insulator (glass) electrode system
Properties and Applications of Dielectric Materials, 1997., Proceedings of the 5th International Conference on; 06/1997
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ABSTRACT: We have constructed a PD pulse measurement and degradation diagnosis system (PDM/ES-I) of materials suffering partial discharge using a personal computer. We applied PDM/ES-I to electrical tree degradation in low density polyethylene. The PD pattern measured at a given aging time was compared with five standard normalized PD patterns which had been registered in advance as five representative degradation stages. Consequently, the pattern recognition method proved to allow an exact determination of the time when the tree was initiated. In addition, the result of assessment agreed well with the observed tree shape
Partial Discharge, 1993., International Conference on; 10/1993
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ABSTRACT: The authors have constructed a prototype of an online PD pulse
measurement and expert system (PDM/ES-I) using a personal computer for
insulation degradation diagnosis of materials suffering partial
discharge (PD). For 0.1-mm-thick LDPE (low-density polyethylene) film,
using the CM-II electrode system and PDM/ES-I, they measured the
temporal changes of Φ- q - n characteristics of PD
pulses and analyzed 33 kinds of statistical PD parameters up until
breakdown. They found that five new statistical PD parameters correlated
with aging time. PD pulse occurrence distribution also proved to have a
correlation with aging time. Diagnosis was made under the same
conditions with either a diagnosis system using statistical parameters
or one using pattern recognition. Both permitted an exact determination
of the degree of degradation at a given aging time, predicting the
breakdown residual life of the CM-II electrode system using LDPE
Conduction and Breakdown in Solid Dielectrics, 1992., Proceedings of the 4th International Conference on; 07/1992
