Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1998-06-11
2000-08-15
Ballato, Josie
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
324127, G01R 1900
Patent
active
061041815
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Voltmeter, suitable for medium/high-voltage devices, having a surface-wave device.
The present invention relates to a voltmeter which is suitable for medium/high-voltage devices.
Many embodiments of high-voltage meters, based on various operating principles, are known. Many such meters operate on a magnetic principle, or with evaluation of the magnetic field of currents flowing in high-voltage devices. For all such devices, a problem to be observed or solved is that of ensuring sufficient high-voltage insulation and to rule out the high-voltage risks to operating personnel and the like which may occur with such meters.
High-voltage meters are, for example, disclosed in the U.S. Pat. Nos. 3,428,896, 3,633,191, 4,158,810 and 4,261,818 as well as in European reference EP-0 314 850 B1. In particular, the latter publication explains the problems which arise in conjunction with multi-conductor high-voltage systems such as three-phase high-voltage lines. This publication describes in detail relatively inexpensive measures by which effects on measurement values, due to the presence of neighbouring high-voltage conductors, can be solved or by which corrections may be made to measured values. This publication also sets out general facts relating to high-voltage meters, which need not therefore be repeated in the description of the present invention.
A decade ago, U.S. Pat. No. 4,611,207 disclosed the features of the precharacterizing clause of Patent a capacitive voltage divider which consists of two capacitors with, arranged between them, an electrically conductive surface element forming a potential surface of the voltage divider, and lies between the high-voltage electrical conductor and a base potential. Associated with these features, this document describes an electronic circuit as a voltmeter device with an amplifier stage and a downstream transmitter stage which necessarily require a power source for supplying them and, like the voltmeter device, are at high-voltage potential.
In a different context, actually a decade ago as well, European reference EP-AUS-0166065A1 and U.S. Pat. No. 4,510,443 disclosed mutually corresponding surface-wave voltmeter devices as described in more detail below.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a voltmeter, suitable for medium/high-voltage devices, whose technical design is simplified, in particular with regard to the electrical insulation requirements as well. A further intention in this case is for the effect of neighbouring current-carrying or live conductors to be taken into account.
The principle of the voltmeter according to the invention is based on one of the type which operates in conjunction with or on the basis of an impedance voltage divider. In particular, this is a capacitive voltage divider. The intended voltage divider is provided inserted between an electrical conductor whose electrical voltage potential is to be measured relative to an electrical base potential, and this base potential. Further details of this can be found in the publication Bayer, Boeck, Moller and Zaengl "Hochspannungstechnik" (Power electrical Engineering) Verlag Springer 1986, Chapter 10.6.3.2, pages 313-317 and the description of the Figures.
The voltmeter according to the invention has a surface-wave device as the measuring element proper. In the case of the invention, the latter has the function of measuring an electrical voltage occurring across the voltage divider, namely a voltage whose electric field has a valuable effect on the wave propagation in the surface-wave device. The surface-wave device is a part of a capacitive voltmeter. Preferred embodiments of the invention have a capacitive voltage divider. With regard to further details of the surface-wave device, reference is likewise made to the description of the Figures.
In the invention, a voltage divider is also used for achieving a predeterminable or computable division of the occurring total electrical voltage to be measured, which is such that one voltag
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patent: 4233573 (1980-11-01), Grudkowski
patent: 4261818 (1981-04-01), Sweeney
patent: 4510443 (1985-04-01), Inaba et al.
patent: 4611207 (1986-09-01), Anderson et al.
Bayer et al, Hochspannungstechnik [Power Electrical Engineering] Verlag Springer 1986, Chapter 10.6.3.2, pp. 313-317. (no month available)
Bulst Wolf-Eckhart
Maier Reinhard
Muller Ansgar
Ostertag Thomas
Ballato Josie
Siemens Aktiengesellchaft
Tang Minh
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