Test procedure for the assessment of field-bound interference caused by HV insulators

Información del proyecto

Identificador del acuerdo de subvención: SMT4962110

Proyecto cerrado

Fecha de inicio 1 Diciembre 1996

Fecha de finalización 28 Febrero 1999

Financiado con arreglo a

• Specific research and technological development programme in the field of standards, measurements and testing, 1994-1998

Coste total

Sin datos

Aportación de la UE

Sin datos

Coordinado por

Universität Dortmund
Germany

Objetivo

Objectives
The main objectives of this project are in a first step the experimental investigation of wire-bound and field-bound interference of HV insulators and in a second step the analysis of the relationship between both by means of theoretical considerations and modelling.

State of progress
Partial discharge levels are generated up to some 10 nC and RI field levels are measured reaching Emax = 120 dB(µV/m) with frequency components up to 1 GHz. Hereby, the accomplished examinations prove the practicability of the test setup, developed for measuring radiation of external partial discharges at high voltage insulators as well as the reproducibility of radiation properties in different measuring surroundings. Simultaneously, measurements in free-air stations show equal characteristics and emphasize the practical emc relevance of HV insulators. The simulation tool is used for a parameter study of the setups geometry. Length and height of single line sections and the position of the receiving antenna are varied and changes in field radiation are investigated. From simulation results it can be concluded, that the importance of the length of the vertical conductor between insulator and the horizontal conductor is neglectible with regard to its effect on field radiation, as long as a minimal length is maintained. With a fixed position of the receiving antenna in front of the insulator, no significant changes of the spectrum are recognizable. With increasing distance, field spectra in a distance of l = 1..10 m drop out continuously. Resonance peaks shift besides lower frequencies with conservation of the pattern of the spectrum. Results show that an accurate geometry has a subordinary effect on field radiation; more important is the type of discharge phenomena. Phase-angle-resolved pd measurements with simultaneously field spectra measurements of different types of discharge phenomena confirm the correlation between type of discharge phenomena and field spectra. By recognition of the discharge phenomena the corresponding field spectra can be a predict. Field radiation of trichel pulses is neglectible and field radiation of single streamer discharges can be assessed. Micro discharges shows a constant amplitude of field spectra with frequency components above 1 GHz. Amplitudes of field spectra are correlated with the amplitude of the apparent charge of single discharges. For that reasons, it seems to be possible to predict the field radiation without field measurement only by recognition of the discharge phenomena. Hereby, the influence of the test surrounding, which is most important by measurements of field spectra, is neglectible. Regarding time- and cost-optimization the test procedure for the assessment of field bound interference caused by HV insulators is reduced to standardized partial discharge measurement according to IEC 270, originally intended for qualifying stress analysis and now obtaining a new meaning.
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Background
Due to the current state of standards, there exists no test procedure to detect the radiated interference field of HV insulators. However, the protection requirements given in the European EMC directive EMC 89/336/EEC, especially concerning the increasing density of wireless telecommunications, necessitate procedures to detect radio interference field intensities of HV components.
Workprogramme
The work programme can be subdivided into four work packages (WP) containing several sub-tasks. Experimental studies in the laboratory are performed in the first WP. This means basically that field- and conductor-bound measurements are performed for different insulators at varying HV levels. In the second WP, a model for interference propagation is developed based on a theoretical analysis and the assessment of the measurement results obtained in WP1. The data obtained in WP1 and WP2 is compared with measurements of insulators under practical operating conditions in WP3. In the last working step, a proposal for standardising RI field testing at insulators shall be set.

Ámbito científico (EuroSciVoc)

• ciencias naturales › matemáticas › matemáticas puras › geometría
• ingeniería y tecnología › ingeniería eléctrica, ingeniería electrónica, ingeniería de la información › ingeniería de la información › telecomunicación
• ciencias naturales › informática y ciencias de la información › software › software de aplicación › software de simulación

Programa(s)

• FP4-SMT - Specific research and technological development programme in the field of standards, measurements and testing, 1994-1998

Tema(s)

• 02 - Research related to written standards and technical support to trade

Convocatoria de propuestas

Datos no disponibles

Régimen de financiación

CSC - Cost-sharing contracts

Coordinador

Universität Dortmund

• Aportación de la UE: Sin datos
• Dirección: 66,Emil-Figge-Straße ; 44221 Dortmund ; Alemania
• Coste total: Sin datos

Participantes (2)

KEMA Nederland BV

Países Bajos

• Aportación de la UE: Sin datos
• Dirección: 310,Utrechtseweg 310 ; 6812 AR Arnhem
• Coste total: Sin datos

RWE Energie AG

Alemania

• Aportación de la UE: Sin datos
• Dirección: 5,Kruppstrasse ; 45128 Essen
• Coste total: Sin datos