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Dive into the research topics where Christophe Guillermin is active.

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Featured researches published by Christophe Guillermin.


Journal of Physics D | 2006

Space charge distribution measurement methods and particle loaded insulating materials

Stéphane Holé; Alain Sylvestre; Olivier Gallot-Lavallée; Christophe Guillermin; Pascal Rain; S. Rowe

In this paper the authors discuss the effects of particles (fillers) mixed in a composite polymer on the space charge measurement techniques. The origin of particle-induced spurious signals is determined and silica filled epoxy resin is analysed by using the laser-induced-pressure-pulse (LIPP), the pulsed-electroacoustic (PEA) and the laser-induced-thermal-pulse (LITP) methods. A spurious signal identified as the consequence of a piezoelectric effect of some silica particles is visible for all the methods. Moreover, space charges are clearly detected at the epoxy/silica interface after a 10-kV/mm poling at room temperature for 2 hours.


Journal of Physics D | 2006

Transient and steady-state currents in epoxy resin

Christophe Guillermin; Pascal Rain; S. Rowe

Charging and discharging currents have been measured in a diglycidyl ether of bisphenol-A epoxy resin with and without silica fillers, below and above its glass transition temperature Tg = 65 °C. Both transient and steady-state current densities have been analysed. The average applied fields ranged from 3 to 35 kV mm−1 with a sample thickness of 0.5 mm. Above Tg, transient currents suggested a phenomenon of charge injection forming trapped space charges even at low fields. Steady-state currents confirmed that the behaviour was not Ohmic and suggested Schottky-type injection. Below Tg, the current is not controlled by the metal–dielectric interface but by the conduction in the volume: the current is Ohmic at low fields and both transient and steady-state currents suggest a phenomenon of space-charge limited currents at high fields. The field threshold is similar in the filler-free and the filled resin. Values in the range 12–17 kV mm−1 have been measured.


ieee international conference on solid dielectrics | 2004

Characterization of electro-thermal aging of a filled epoxy resin

Christophe Guillermin; P. Rain; S. Rowe

A DGEBA-type epoxy resin filled with silica flour has been submitted to long-term electro-thermal, or purely thermal, aging. Following this aging dielectric spectroscopy and current measurements were made. Changes in low frequency permittivity and loss tangent have been observed. The relative contributions to aging of the electric field and the temperature are discussed.


IEEE Transactions on Dielectrics and Electrical Insulation | 2012

Experimental model of a silica/epoxy interface submitted to a hygrothermal aging: a dielectric characterization

Pascal Rain; Emilie Brun; Christophe Guillermin; S. Rowe

In order to investigate the influence of a hygrothermal aging on the organic/mineral interfaces of a silica filled epoxy resin, a macroscopic experimental model of a silica/epoxy interface was designed and realized. It consisted in coplanar interdigitated electrodes deposited on a quartz substrate moulded in epoxy resin. The dielectric properties have been followed at 80°C and 80% relative humidity. These properties have been compared with the evolutions of sheets and mouldings of unfilled epoxy resin submitted to the same conditioning. Measurements evidenced the formation of an interphase at the quartz/resin interface which appeared precisely when the water reached the quartz after its diffusion through the resin. The water bound to the resin during the conditioning of the unfilled samples induced a drop of resistance of nearly 3 decades. In the same time, due to the interphase which has grown at the organic/mineral interface, the resistance between the interdigitated electrodes fell of five decades, i.e. two more decades. This interphase is characterized by a surface resistivity of 80.106 Ω. This data may be used to evaluate prebreakdown phenomena resulting from a hygrothermal aging of silica/epoxy insulations.


ieee international conference on solid dielectrics | 2004

Influence of T/sub g/ on space charge development in epoxy resin

Christophe Guillermin; P. Rain; S. Rowe

Space charge development has been studied in a filler free epoxy resin at temperature below (328 K) and above (353 K) T/sub g/. Space charge generation was observed at low DC electric field (2 kV/mm) at each temperature. The nature of the space charges is different at these two temperatures. The role of the water content on the space charge generation is shown and discussed.


ieee international conference on solid dielectrics | 2013

A comparison of electric and dielectric properties of standard and high-crystallinity polypropylene films

Abdelkader Kahouli; Olivier Gallot-Lavallée; Pascal Rain; O. Lesaint; Christophe Guillermin; Jean-Marc Lupin

The dielectric properties of two grades of Bi-oriented isotactic polypropylene (BOiPP) are studied, using a variety of techniques: breakdown field measurements, dielectric spectroscopy, thermally stimulated depolarization currents, dc conduction currents. Standard (STPP) and high-crystallinity (HCPP) polypropylene films are investigated. Measurements are carried out over a wide temperature range, up to (-150°C/ +125°C). Breakdown field in both materials show a very small difference. On the other hand, dielectric losses and dc conduction currents are significantly lower in HCPP. Both materials show a decrease of dielectric losses versus temperature in the range (20-90°C), favorable for the application to ac power capacitors. The analysis of dc currents allows to evidence two main conduction mechanisms: (i) below 80°C in both materials, a hopping mechanism due to motion of electrons occurring in the amorphous phase; (ii) above 80°C, an ionic conduction in HCPP and a hopping conduction in STPP.


conference on electrical insulation and dielectric phenomena | 2002

Space charge measurements in epoxy resin under DC voltage

Christophe Guillermin; P. Rain; Alain Sylvestre; S. Rowe

Various regimes of homocharge and heterocharge generation have been observed in the range 5-40 kV/mm dc. Three temperature domains have been studied depending on the glass transition temperature of the epoxy resin (Tg/spl sim/65/spl deg/C): 20-40/spl deg/C for glassy state properties, 55/spl deg/C (just below T/sub g/), and 80/spl deg/C (above T/sub g/).


ieee international conference on dielectrics | 2016

Breakdown strength of impregnated capacitor elements

Christophe Guillermin; Sandrine Fontana

The dielectric strength of unaged and aged capacitor elements is described using a 2-parameters Weibull statistical analysis. The experimental results suggest that aged elements can be split in two populations. The electric stress at the electrode edge is shown to be an important parameter regarding the decrease of dielectric strength. A threshold value of the stress in this area was determined from the bibliography and is confirmed by the experimental evidence.


IEEE Transactions on Power Delivery | 2013

Metallized Film Power Capacitors End-of-Life Study Through Monitored Destruction Tests

Christophe Guillermin; Olivier Dujeu; Jean-Marc Lupin

A wide range of experiments was performed on metallized film capacitors. The monitoring of destruction tests was used to analyze the electrical properties of artificial critical defects. It is shown herein that these defects in the windings of the capacitors have a wide range of electrical properties and the behavior of the capacitor in the test is strongly related to these properties. A model is proposed to describe the degeneration of dielectric failure, the use of this model can help to predict the behavior of capacitors when they reach the end of life and to a more accurate design of the protection systems.


ieee international conference on solid dielectrics | 2010

Hygrothermal ageing of a filled epoxy resin: Measurements of the insulation properties and qualitative modelling

P. Rain; Emilie Brun; Christophe Guillermin; S. Rowe

Samples of epoxy filled with silica have been subjected to hygrothermal aging at 80 °C and 80% relative humidity for several months. These samples were characterized by the measurements of resistances, partial discharges and breakdown voltages. Results for both silanized and non-silanized fillers were obtained. After ageing, large differences were observed in both breakdown voltage and resistance. The breakdown voltage was reduced by a factor of 10 after 74 days of ageing without silanization whereas the decrease was a factor of 2 with silanized fillers. The resistance was reduced by more than 4 decades in the former case and one decade in the second case. The breakdown was preceded by the occurrence of partial discharges. Partial Discharges Inception Voltage (PDIV) dropped by a factor of 10 between 32 days and 74 days of ageing. The PDIV was sensitive to the sample temperature: it was lower at larger temperatures. Partial Discharges (PD) patterns suggest that the discharges occurred in gaseous cavities. Based upon these measurements, a model of breakdown phenomenon based upon cavities filled of water vapour is proposed and discussed.

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Pascal Rain

Centre national de la recherche scientifique

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O. Lesaint

University of Grenoble

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Christophe Mavon

University of Franche-Comté

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Jean-Michel Friedt

University of Franche-Comté

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