### Abstract

Water tree characteristics have been investigated for low-density polyethylene by applying power-frequency ac voltages with high-frequency components, which are simulated output voltages of a pulse-width-modulation inverter. If we compare the water-tree length among single-frequency voltages, the water tree grows faster if the frequency is higher. However, if we superpose a power-frequency voltage onto the high-frequency voltage, the tree growth is suppressed. The tree length becomes shorter if the superposed power-frequency voltage is higher. This surprising result is explainable by considering that the zero-crossing of the applied voltage plays an important role for the tree propagation. In case that the high-frequency voltage is superposed onto a dc voltage, the dc voltage seems not to have any influence to the tree growth. This result can be also explained by considering the number of voltage reversals at the tree tip.

Original language | English |
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Title of host publication | Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report |

Publisher | IEEE |

Pages | 300-303 |

Number of pages | 4 |

Volume | 1 |

Publication status | Published - 1997 |

Event | Proceedings of the 1997 Annual Conference on Electrical Insulation and Dielectric Phenomena. Part 2 (of 2) - Minneapolis, MN, USA Duration: 1997 Oct 19 → 1997 Oct 22 |

### Other

Other | Proceedings of the 1997 Annual Conference on Electrical Insulation and Dielectric Phenomena. Part 2 (of 2) |
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City | Minneapolis, MN, USA |

Period | 97/10/19 → 97/10/22 |

### Fingerprint

### ASJC Scopus subject areas

- Electrical and Electronic Engineering
- Industrial and Manufacturing Engineering
- Building and Construction

### Cite this

*Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report*(Vol. 1, pp. 300-303). IEEE.

**Role of voltage zero-crossing in propagation of water trees.** / Mukai, S.; Suzuki, H.; Ohki, Yoshimichi; Nakamichi, Y.; Ajiki, K.; Li, Y.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report.*vol. 1, IEEE, pp. 300-303, Proceedings of the 1997 Annual Conference on Electrical Insulation and Dielectric Phenomena. Part 2 (of 2), Minneapolis, MN, USA, 97/10/19.

}

TY - GEN

T1 - Role of voltage zero-crossing in propagation of water trees

AU - Mukai, S.

AU - Suzuki, H.

AU - Ohki, Yoshimichi

AU - Nakamichi, Y.

AU - Ajiki, K.

AU - Li, Y.

PY - 1997

Y1 - 1997

N2 - Water tree characteristics have been investigated for low-density polyethylene by applying power-frequency ac voltages with high-frequency components, which are simulated output voltages of a pulse-width-modulation inverter. If we compare the water-tree length among single-frequency voltages, the water tree grows faster if the frequency is higher. However, if we superpose a power-frequency voltage onto the high-frequency voltage, the tree growth is suppressed. The tree length becomes shorter if the superposed power-frequency voltage is higher. This surprising result is explainable by considering that the zero-crossing of the applied voltage plays an important role for the tree propagation. In case that the high-frequency voltage is superposed onto a dc voltage, the dc voltage seems not to have any influence to the tree growth. This result can be also explained by considering the number of voltage reversals at the tree tip.

AB - Water tree characteristics have been investigated for low-density polyethylene by applying power-frequency ac voltages with high-frequency components, which are simulated output voltages of a pulse-width-modulation inverter. If we compare the water-tree length among single-frequency voltages, the water tree grows faster if the frequency is higher. However, if we superpose a power-frequency voltage onto the high-frequency voltage, the tree growth is suppressed. The tree length becomes shorter if the superposed power-frequency voltage is higher. This surprising result is explainable by considering that the zero-crossing of the applied voltage plays an important role for the tree propagation. In case that the high-frequency voltage is superposed onto a dc voltage, the dc voltage seems not to have any influence to the tree growth. This result can be also explained by considering the number of voltage reversals at the tree tip.

UR - http://www.scopus.com/inward/record.url?scp=0031339302&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031339302&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0031339302

VL - 1

SP - 300

EP - 303

BT - Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report

PB - IEEE

ER -