Electrical transmission or interconnection systems – Switching systems – Switch actuation
Patent
1997-02-05
1998-09-01
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Switching systems
Switch actuation
321415, 321417, 321418, 321422, 364550, 36455001, 340635, 340644, 327384, G08B 2100
Patent
active
058014616
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for monitoring the operating safety of power switches, and in particular, for monitoring vacuum power switches in medium-voltage switchgear.
BACKGROUND INFORMATION
A device for monitoring the operating safety of power switches is described in PCT International Application No. WO 93/23760.
A variety of operating parameters of critical power switches are recorded by appropriate monitoring devices and stored in individual monitoring memory devices. This data is then called up by a superior calculating unit and compared with already-available data from non-critically operating power switches and evaluated. In the event of major deviations, maintenance procedures can be initiated if required, or complete shutoff processes can be triggered.
A testing program for detecting environmental influences on such power switches is described for example in the publication "Developments in Design and Performance of EHV Switching Equipment," IEEE Conference Publication Number 182, 1979, pages 126-129. According to this article, electrical switching capacity tests are performed using a synthetic test circuit (as well as a number of mechanical tests) to test the switching ability of the contacts, for example, in the course of a certain number of switching processes, etc., as well as their contact resistance and the close proximity of contacts such as the gas pressure conditions. In addition, the mechanical loads on moving parts of the power switching equipment are tested to determine the data relevant to operating safety on the power switches as a function of switching frequency.
In German Patent No. 41 31 828, a method is described for checking the mechanical functions of an electrical switch exposed to environmental influences. The method described therein employs a series of tests to detect and evaluate the fluctuations of spring-loaded storage devices, various loads caused by friction in bearings, and similar phenomena. The goal of this conventional method is to employ the comparative data thus obtained to draw conclusions about the state and application of a power switch that has just been tested. Thus, for example, the rotational speed of the operating shaft is detected by means of a displacement sensor (position encoder) of the type conventionally used in electrical engineering, and determined by calculating the corresponding switching energy values under the existing environmental influences. If sufficient comparative values for these load switches are available from measurements and calculations of power switches of the same type investigated previously, the limits of the range of application of the power switch being tested can be determined by a comparative examination.
SUMMARY OF THE INVENTION
The present invention provides a device for monitoring the operating safety of power switches, especially vacuum power switches in medium-voltage switchboards. The device includes data-processing microprocessor units having a microprocessor, a microprocessor control, and a processor-oriented memory device. The device also includes current detection devices for detecting and converting a rated current of the power switch and for detecting and converting a motor current that drives the movable part of the power switch. In addition, the device includes a current detection device with current converters for signal adaptation.
The present invention considerably expands on conventional methods by refining the individual method steps in such fashion that in addition to the purely mechanical conditions that are available in a normal state, as many of the relevant influential parameters as possible can be used to evaluate the operating safety of power switches.
The device according to the present invention includes a microprocessors unit which is connected to an angle pulse rotation direction detection device which converts a movement of a movable part of the power switch into data that can be processed by a microprocessor. The device includes a current-voltage c
REFERENCES:
patent: 3765015 (1973-10-01), Gruner
patent: 4323890 (1982-04-01), Lemke
patent: 4398144 (1983-08-01), Heidemann
patent: 4864286 (1989-09-01), Ohshita et al.
patent: 4945256 (1990-07-01), Tada et al.
patent: 5585678 (1996-12-01), Dijk et al.
patent: 5629869 (1997-05-01), Johnson et al.
"Developments in Design and Performance of EVH Switching Equipment", IEEE Conference Publication No. 182, pp. 126-129 (1979).
Anger Nils
Hilpert Johannes
Reinert Werner
Paladini Albert W.
Shoop Jr. William M.
Siemens Aktiengesellschaft
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