Patent US4056776A successfully refreshed from Google Patents.
US4056776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination of a thyristor connection and a test device
Assignee: ABB Norden Holding AB
•
Filing: 1975-12-11
•
Granted: 1977-11-01
•
Expires: 1995-12-11
Abstract
Abstract A thyristor connection which includes a plurality of thyristors each parallel to a voltage divider and a test device for individual testing of the individual thyristors. The test device includes a feeding circuit and a device for measuring the leakage current in one thyristor. The voltage divider for each thyristor is provided with output terminals for connecting the feeding circuit across a part of the voltage divider during measurement. There is a measuring section in series with such part of the voltage divider for connection of the measurement device. The thyristor connection is provided with an outer voltage divider in parallel with the connection which is provided with an output for connection of a point of the voltage divider to a pole of the feeding circuit.
Inventors
- 👤 Karl Erik Olsson
- 👤 Bengt Sehman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:08
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/40; G01R31/26; G01R31/2607; G01R31/263
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
126 words
A combination comprising: a plurality of serially connected thyristor devices, each said thyristor device including a voltage divider and each voltage divider being parallelly connected to an associated thyristor in each of said thyristor devices; a test device for testing the individual thyristors in place in the serially connected thyristor devices and including a voltage source and means for measuring the leakage current in an individual thyristor; and said voltage divider of each thyristor device including first connection means for removable connection of said voltage source across at least a part of said voltage divider, a measuring section connected in series with said at least part of said voltage divider and second connection means for removable connection of said measuring section to said means for measuring.
Claim 2
Dependent Claim
126 words
A combination comprising: a plurality of serially connected thyristor devices, each said thyristor device including a voltage divider and each voltage divider being parallelly connected to an associated thyristor in each of said thyristor devices; a test device for testing the individual thyristors in place in the serially connected thyristor devices and including a voltage source and means for measuring the leakage current in an individual thyristor; and said voltage divider of each thyristor device including first connection means for removable connection of said voltage source across at least a part of said voltage divider, a measuring section connected in series with said at least part of said voltage divider and second connection means for removable connection of said measuring section to said means for measuring.
Claim 3
Dependent Claim
59 words
A combination according to claim 1, in which said means for measuring includes a voltmeter and said measuring section further including resistance means forming a part of said voltage divider and connected to the anode of the thyristor under test and, said voltage source being connected across another part of said voltage divider in series with said resistance means.
Claim 4
Dependent Claim
43 words
A combination according to claim 1, said measuring section including a part of the connection between said voltage divider part and the anode of the thyristor under test, said means for measuring being a clip-on ammeter arranged to grip around said measuring section.
Claim 5
Dependent Claim
15 words
A combination according to claim 1, said first and second connection means being plug contacts.
Claim 6
Dependent Claim
46 words
A combination according to claim 1, said first and second connection means having a predetermined configuration and said test device further including a combined connection device including said voltage source, said means for measuring and third connection means engageable with said first and second connection means.
Claim 7
Dependent Claim
40 words
A combination according to claim 1, in which said voltage source is energized from an AC power source and includes a converter to generate DC voltage pulses and a pole reverser for reversing the polarity of said DC voltage pulses.
Claim 8
Dependent Claim
43 words
A combination according to claim 1, further comprising second voltage dividers each connected in parallel with adjacent series connected thyristors, said second voltage dividers each including an output terminal for connection of a node of said second voltage divider to said voltage source.
Claim 9
Dependent Claim
38 words
A combination according to claim 1, wherein said test device further includes an alternating voltage source for connection to said voltage divider through said first connection means and second means for measuring the capacitance of said voltage divider.
References Cited (Backward Citations)
US3199026A
Cited
US3582774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |