Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1994-06-07
1995-11-21
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
361605, 361618, 218 1, 218 68, G01R 1900
Patent
active
054690501
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a high-voltage measurement device for use in an electrical high-voltage switchboard plant with an encapsulating housing. The high voltage measurement device includes a measurement electrode which extends into the encapsulating housing and an electrical conductor which conducts a measurement signal provided by the measurement electrode. The electrical conductor is connected with the measurement electrode and passes through the wall of the encapsulating housing in an insulated manner.
Such a measurement device is known, for example, from the technical article. Albiez, et al., "DESIGN AND CALIBRATION OF A UNIVERSAL SENSOR FOR THE MEASUREMENT OF PARTIAL DISCHARGES AND VERY FAST TRANSIENTS IN GIS", SIXTH INTERNATIONAL SYMPOSIUM ON HIGH VOLTAGE ENGINEEERING, New Orleans, La., USA, (Aug. 28-Sep. 1, 1989). In the Albiez article. for example, a measurement sensor is represented in FIG. 5, from which a conductor passes to the outside through the wall of an encapsulating housing, in insulated manner. The measurement sensor discussed in the Albiez article is used for several purposes, namely for measuring partial discharges and for measuring fast transients, with a matching external circuit in each instance.
A high-voltage measurement device for an electrical high-voltage switchboard plant with an encapsulating housing and a measurement electrode built into the latter, as well as an electrical conductor which conducts a measurement signal, connected with the electrode and passed through the wall of the encapsulating housing in insulated manner is known from the German patent publication number DE-PS 34 09 016 ("'the 016 publication").
In the 016 publication, the measurement electrode is formed by a contact spring which can be connected with the phases of bus conductors by means of a contact blade.
In normal operation of the switchboard plant described in the '016 publication, the contact spring is open so that high voltage can be capacitatively coupled out of the switching system via the conductor. The high voltage is then applied at the conductor on the outside of the encapsulating housing, and could endanger the operating personnel under certain circumstances. Only in the grounded state of the grounding switch is the contact spring, and thus also the conductor which passes through the wall of the encapsulating housing, grounded and therefore accessible without danger.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a high-voltage measurement device which can be deactivated when no measurements are being made such that any operating personnel are protected from high voltages at the conductor and at the measurement device.
The present invention achieves this objective by providing a grounded spring contact which is arranged outside the encapsulating housing. The spring contact rests against the conductor to ground it when no measurement device is connected to the conductor and can be forced off from the conductor when a measurement device is connected to the conductor.
With this spring contact, the conductor is grounded in the normal state, i.e., when the spring contact is not forced off from the conductor, so that no high voltage can occur at the conductor outside the encapsulating housing. The device to process measurement signals connected to the conductor is also kept away from the influence of the high voltage, if no measurement is provided for.
In an advantageous embodiment of the present invention, a switchboard housing, which can be set onto the conductor as needed and which surrounds the device to process and/or transmit the measurement signal, is provided. This switchboard housing acts upon an activation element which lifts the spring contact away from the conductor when the switchboard housing is set onto the conductor.
By means of the activation element, the spring contact is lifted off from the conductor before the beginning of a measurement in each instance, when the switchboard housing is set onto the conductor,
REFERENCES:
patent: 4424490 (1984-01-01), Mamet et al.
Fachartikel "Design and Calibration of an Universal sensor for the measurement of partial discharges and very fast transients in Gis", Sixth International Symposium of High Voltage Engineering, Aug. 28-Sep. 1, 1989, pp. 1-4.
Gorablenkow Jorg
Lorenz Dieter
Khosravi Kourosh Cyrus
Siemens Aktiengesellschaft
Wieder Kenneth A.
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