Global Patent Index - EP 1023588 A1

EP 1023588 A1 2000-08-02 - IMPREGNATION METHOD AND DEVICE FOR MONITORING THE IMPREGNATION OF A CARRIER MATERIAL

Title (en)

IMPREGNATION METHOD AND DEVICE FOR MONITORING THE IMPREGNATION OF A CARRIER MATERIAL

Title (de)

TRÄNKVERFAHREN UND VORRICHTUNG ZUR ÜBERWACHUNG DER DURCHTRÄNKUNG EINES TRÄGERMATERIALES

Title (fr)

PROCEDE D'IMPREGNATION ET DISPOSITIF DE CONTROLE DE L'IMPREGNATION D'UN MATERIAU SUPPORT

Publication

EP 1023588 A1 (DE)

Application

EP 98958184 A

Priority

  • DE 9802925 W
  • DE 19745404 A

Abstract (en)

[origin: DE19745404A1] For the impregnation of a carrier material, by immersion, the dielectric constant of the material changes during impregnation. A value (C) is measured, related to the dielectric constant, which gives the impregnating penetration (D) of the carrier material. In an Independent claim the monitoring system has a conductor (3) so that the carrier material acts as a dielectric to affect the electrical capacity of the conductor (3), which is measured. The conductor can be an electrically conductive strip, around the carrier material, with the electrical lead of the conductor rod. To measure the value (C), the electrical capacity is used of an electrical conductor, with the carrier material acting as a dielectric. The timed run (C(t)) of the measurement gives the timed run (D(t)) of the impregnation. A functional relationship (DR(C)) between a reference impregnation (DR) and the measured value gives the functional relationship of the impregnation. The timed run (D(t)) of the impregnation (D) is expressed as D(t)=DR(C(t)), where D is the impregnation, DR the reference impregnation, C the measured value and especially capacity, and t is the time. The amount of impregnation is defined as the ratio of impregnated and non-impregnated vols. of the carrier material. To determine the stages of impregnation, according to given parameters, each stage has a reference impregnation provided by a simulation model with a spaced distribution in the carrier material with at least one zone which is not impregnated and one zone which is impregnated. At least one dry zone (4) has an initial dielectric constant and at least one damp zone (5) has another dielectric constant. Each reference impregnation (DR), together with the dielectric constants, is associated with a measured value (C) to give the required functional relationship (CD(C)). Using a porous carrier material, the spaced distribution of the reference impregnation (DR) uses the Darcy law for a current of a Newton impregnation medium or by using a suitable modification of the Darcy law for a non-Newton impregnation medium. From the impregnation (D), the penetration depth is derived of the impregnation medium in the carrier material, in a timed run of the penetration and at least one factor of the filtration coefficient, flow resistance, permeability and relative porosity, which also gives the viscosity of the impregnating medium. The material can be the fibers, to be impregnated and form the compound material, or the carrier material is an electrical insulation.

IPC 1-7 (main, further and additional classification)

G01N 27/22

IPC 8 full level (invention and additional information)

G01N 27/22 (2006.01)

CPC (invention and additional information)

G01N 27/221 (2013.01)

Citation (search report)

See references of WO 9919720A1

Designated contracting state (EPC)

AT CH DE ES FR GB IT LI

EPO simple patent family

DE 19745404 A1 19990415; CN 1278916 A 20010103; EP 1023588 A1 20000802; JP 2001520378 A 20011030; WO 9919720 A1 19990422

INPADOC legal status


2004-03-03 [18W] WITHDRAWN

- Effective date: 20040107

2000-08-02 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000417

2000-08-02 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT CH DE ES FR GB IT LI