US3882380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage component testing systems
Assignee: F C ROBINSON AND PARTNERS Ltd
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Filing: 1973-02-07
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Granted: 1975-05-06
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Expires: 1993-02-07
Abstract
Abstract Apparatus and method for testing electrical components for partial electric discharges which occur in such components, but which do not bridge the electrodes of such components. The electrical components to be tested are connected to monitoring units whose outputs are in turn connected to a comparator circuit, such as an AND gate. The comparator circuit compares the outputs from the monitoring units to determine whether a predetermined polarity or time relationship indicative of a partial discharge has been satisfied. Such relationship is dependent upon the configuration of the testing circuit.
Inventors
- 👤 Ian Alexander Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:19
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/26; G01R27/2605; G01R31/00; G01R31/12; G01R31/40
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
178 words
A method of testing an electrical component for any partial discharge comprising connecting two separate monitoring units into a circuit arrangement comprising a component to be tested and two terminals of a potential supply source, each of said monitoring units being connected between said two terminals via a respective electrical component, one of which may be the component to be tested, and wherein the output of each monitoring unit is fed to a separate input of a comparator circuit which compares the respective polarities or time relationship of pulses produced by said monitoring units, and the circuit arrangement being such that the polarity or time relationship of pulses caused by any external transient voltage fluctuations imposed upon said potential supply source differs from the corresponding relationship of any respective pulses produced by a partial discharge in any said component within said circuit arrangement, said comparator circuit being such that it responds to produce an output pulse only in the event of the latter type of pulse relationship, and not in the event of pulses caused by external transients.
Claim 2
Independent Claim
178 words
A method of testing an electrical component for any partial discharge comprising connecting two separate monitoring units into a circuit arrangement comprising a component to be tested and two terminals of a potential supply source, each of said monitoring units being connected between said two terminals via a respective electrical component, one of which may be the component to be tested, and wherein the output of each monitoring unit is fed to a separate input of a comparator circuit which compares the respective polarities or time relationship of pulses produced by said monitoring units, and the circuit arrangement being such that the polarity or time relationship of pulses caused by any external transient voltage fluctuations imposed upon said potential supply source differs from the corresponding relationship of any respective pulses produced by a partial discharge in any said component within said circuit arrangement, said comparator circuit being such that it responds to produce an output pulse only in the event of the latter type of pulse relationship, and not in the event of pulses caused by external transients.
Claim 3
Dependent Claim
66 words
A method as claimed in claim 1, in which said electrical component to be tested is connected in series with one of said monitoring units, and this combination is connected between said two source terminals in parallel with the series combination of a further electrical component and the other of said monitoring units, said comparator being a coincidence gate responsive to simultaneous pulses of opposite polarity.
Claim 4
Dependent Claim
17 words
A method as claimed in claim 2, in which said further electrical component is a reference component.
Claim 5
Dependent Claim
21 words
A method as claImed in claim 2, in which said further electrical component is another component that is to be tested.
Claim 6
Dependent Claim
78 words
A method as claimed in claim 1 in which one terminal of said electrical component to be tested is connected to earth, and said component is connected between said source terminals via one of said monitoring units, whilst the series combination of a reference electrical component and the other of said monitoring units is connected in parallel with said electrical component to be tested, said comparator being a coincidence gate responsive to simultaneous pulses of the same polarity.
Claim 7
Dependent Claim
94 words
A method as claimed in claim 1, in which said two monitoring units are connected in series with respective reference components in separate shunt arms in parallel with said component to be tested, one of said shunt arms having its connections positioned at a point nearer the supply terminals than the component to be tested, and the other being connected across said component via a connection path equal in length to that between the component to be tested and said one shunt arm, said comparator being a coincidence gate responsive to simultaneous pulses only.
Claim 8
Dependent Claim
37 words
A method as claimed in claim 1, in which each of said monitoring units comprises a series impedance and an impedance matching amplifier for coupling the series impedance to a cable for connection to said comparator circuit.
Claim 9
Dependent Claim
25 words
A method as claimed in claim 7, in which a separate pulse shaping circuit is connected in series with each input of said comparator circuit.
Claim 10
Dependent Claim
16 words
A method as claimed in claim 1, in which said potential source is an a.c. source.
Claim 11
Dependent Claim
27 words
A method as claimed in claim 9, in which means are provided to render said comparator circuit effective only during a predetermined part of the supply cycle.
Claim 12
Dependent Claim
84 words
Apparatus for use in a method of testing as claimed in claim 1, in which two monitoring units are provided for connection in a circuit arrangement formed between two potential supply terminals and including the component to be tested, each of said monitoring units having an output terminal connected to an associated input of a comparator circuit that is adapted to produce an output pulse only in the event of the pulses from the two monitoring units having a predetermined polarity or time relationship.
Claim 13
Dependent Claim
22 words
Apparatus as claimed in claim 11, in which said comparator is formed by a coincidence gate having a negator at one input.
Claim 14
Dependent Claim
25 words
Apparatus as claimed in claim 11, in which said comparator is a coincidence gate adapted to respond upon receipt of simultaneous pulses at its inputs.
Claim 15
Dependent Claim
24 words
Apparatus as claimed in claim 11, in which each said monitoring unit is connected to said comparator circuit via an amplifier and pulse shaper.
Claim 16
Dependent Claim
21 words
Apparatus as claimed in claim 11, in which each said monitoring unit comprises a series impedance and an impedance matching amplifier.
Claim 17
Dependent Claim
36 words
Apparatus as claimed in claim 11, in which timing means are provided to selectively render said comparator circuit effective during a predetermined part of any supply cycle, when operating in connection with an a.c. supply source.
Claim 18
Dependent Claim
33 words
Apparatus as claimed in claim 11, in which the output of said comparator is connected to control a gate which is connected between the output of said monitoring units and a display device.
References Cited (Backward Citations)
US2121725A
Cited
US3387208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |