Patent US3735250A successfully refreshed from Google Patents.
US3735250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fault detecting apparatus for a capacitor type potential divider having an amplifier
Assignee: Shibaura Electronics Co Ltd
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Filing: 1971-07-01
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Granted: 1973-05-22
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Expires: 1991-07-01
Abstract
Abstract A capacitor type potential divider having an amplifier is provided with a pair of capacitor units respectively connected to the same phase line of A.C. polyphase power lines. A divided voltage derived from one of the capacitor units is applied through an amplifier to a protecting relay system and/or a voltage measuring device for the polyphase power lines. The output of the amplifier and the divided voltage derived from the other capacitor unit are applied to a comparator for enabling a difference voltage therebetween to be obtained. The difference voltage is then employed to energize a fault detection relay for enabling a fault in the capacitor type potential divider to be detected.
Inventors
- 👤 M Masui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:02
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/02; H02H3/04; G; G01; G01R; G01R15/00; G01R15/14; G01R15/16; G01R19/00; G01R19/145
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
173 words
A fault detecting apparatus for a capacitor type potential divider comprising: a first capacitor unit connected to a phase line of A.C. polyphase power lines for enabling a divided voltage to be obtained therefrom; a second capacitor unit for enabling a divided voltage to be obtained therefrom, said second capacitor unit being connected to the same phase line of said A.C. polyphase power lines to which the first capacitor unit is connected; an amplifier device connected to the output of said first capacitor unit; monitoring means connected to an output of said amplifier device for monitoring the state of said phase line; a comparator having inputs connected to the output of said amplifier device and to the output of said second capacitor unit, said comparator generating an output signal indicating an inequality between said outputs of said amplifier device and said second capacitor unit; and, an inspection relay connected to the output of said comparator for responding to said comparator output signal and thereby indicating an internal fault within said first capacitor unit.
Claim 2
Dependent Claim
173 words
A fault detecting apparatus for a capacitor type potential divider comprising: a first capacitor unit connected to a phase line of A.C. polyphase power lines for enabling a divided voltage to be obtained therefrom; a second capacitor unit for enabling a divided voltage to be obtained therefrom, said second capacitor unit being connected to the same phase line of said A.C. polyphase power lines to which the first capacitor unit is connected; an amplifier device connected to the output of said first capacitor unit; monitoring means connected to an output of said amplifier device for monitoring the state of said phase line; a comparator having inputs connected to the output of said amplifier device and to the output of said second capacitor unit, said comparator generating an output signal indicating an inequality between said outputs of said amplifier device and said second capacitor unit; and, an inspection relay connected to the output of said comparator for responding to said comparator output signal and thereby indicating an internal fault within said first capacitor unit.
Claim 3
Dependent Claim
59 words
A fault detecting apparaTus for a capacitor type potential divider according to claim 1, wherein: at least one of said first and second capacitor units is of an exclusive type and includes serially connected capacitors for enabling the divided voltage to be derived therefrom, and the other unit is formed of another installation provided in the polyphase power lines.
Claim 4
Dependent Claim
32 words
A fault detecting apparatus for a capacitor type potential divider according to claim 2, wherein: said other capacitor unit is a condenser cone of a lead-out bushing of an electric power transformer.
Claim 5
Dependent Claim
28 words
A fault detecting apparatus for a capacitor type potential divider according to claim 2, wherein: said other capacitor unit is a condenser cone mounted in a current transformer.
Claim 6
Dependent Claim
26 words
A fault detecting apparatus for a capacitor type potential divider according to claim 2, wherein: said other capacitor unit is a condenser in a cable head.
Claim 7
Dependent Claim
46 words
A fault detecting apparatus for a capacitor type potential divider according to claim 1, wherein: one of said first and second capacitor units is a condenser cone mounted in a first electric installation; and the other unit is a condenser cone mounted in a second installation.
Claim 8
Dependent Claim
48 words
A fault detecting apparatus for a capacitor type potential divider according to claim 1, wherein: the input of said comparator which is connected to said second capacitor unit is alternately connected to the input of said amplifier device when said second capacitor unit is disconnected from its circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |