Patent US3742346A successfully refreshed from Google Patents.
US3742346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surge generator for transformer testing
Assignee: ABB Inc USA
•
Filing: 1971-08-23
•
Granted: 1973-06-26
•
Expires: 1991-08-23
Abstract
Abstract Apparatus and method for testing short-circuited power transformers. A capacitor, which has been charged to a predetermined voltage, is connected in parallel with an inductor. When the voltage of the discharging capacitor goes through zero, the shorted transformer being tested is connected across the inductor. A matching transformer may be used between the transformer being tested and the inductor for adjusting the surge generator voltage and impedance to match that of the shortcircuited power transformer.
Inventors
- 👤 T Specht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:17
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50; G01R31/62
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
A surge generator for testing a transformer having windings, said surge generator comprising capacitive means and inductive means, means for connecting said capacitive means and said inductive means in parallel circuit relationship, means for charging said capacitive means, means for discharging said capacitive means through said inductive means, and connecting means operable to connect said inductive means in parallel circuit relationship to a winding of the transformer when the voltage on the capacitive means is approximately zero to provide a voltage across said winding which is proportionaL to the voltage across the inductive means.
Claim 2
Dependent Claim
94 words
A surge generator for testing a transformer having windings, said surge generator comprising capacitive means and inductive means, means for connecting said capacitive means and said inductive means in parallel circuit relationship, means for charging said capacitive means, means for discharging said capacitive means through said inductive means, and connecting means operable to connect said inductive means in parallel circuit relationship to a winding of the transformer when the voltage on the capacitive means is approximately zero to provide a voltage across said winding which is proportionaL to the voltage across the inductive means.
Claim 3
Dependent Claim
42 words
The surge generator of claim 1 wherein the capacitive means comprises a capacitor, and the means for charging the capacitor comprises a source of direct current potential having means for connecting and disconnecting said source of direct current potential to said capacitor.
Claim 4
Dependent Claim
36 words
The surge generator of claim 1 wherein the inductive means which is connected in parallel circuit relationship with the capacitive means comprises an inductor having means for connecting and disconnecting said inductor to said capacitive means.
Claim 5
Dependent Claim
42 words
The surge generator of claim 1 wherein the winding of the transformer being tested is connected to a first winding of a matching transformer, said matching transformer having a second winding which is connected in parallel circuit relationship with the inductive means.
Claim 6
Dependent Claim
16 words
The surge generator of claim 1 wherein a winding of the transformer being tested is shorted.
Claim 7
Independent Claim
61 words
A method of providing a surge voltage in a winding of a transformer, said method comprising the steps of charging a capacitive energy storing means, connecting the charged capacitive energy storing means to an inductive means, and connecting a winding of the transformer being tested to the inductive means when the voltage on the capacitive energy storing means is substantially zero.
Claim 8
Independent Claim
61 words
A method of providing a surge voltage in a winding of a transformer, said method comprising the steps of charging a capacitive energy storing means, connecting the charged capacitive energy storing means to an inductive means, and connecting a winding of the transformer being tested to the inductive means when the voltage on the capacitive energy storing means is substantially zero.
Claim 9
Dependent Claim
61 words
The method of providing a surge voltage in a winding of a transformer of claim 6 wherein the step of charging the capacitive energy storing means comprises connecting a direct current potential source in parallel with the capacitive energy storing means until the desired charge is obtained and then disconnecting the direct current potential source from the capacitive energy storing means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |