US3662253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tap changing system for regulating transformers
Assignee: Individual
•
Filing: 1970-10-23
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Granted: 1972-05-09
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Expires: 1990-10-23
Abstract
Abstract A tap changing system for regulating transformers disclosed here is of one resistor type in which vacuum switches are used for its main arcing contacts and a semiconductor switch or a semiconductor controlled switch bidirectionally conductive on AC is used in series to a current limiting resistor circuit which is switchably connected in parallel to said vacuum switches. Tap changing of one resistor method is effected by on-off operation of the vacuum switches, whereby on-off operation of the semiconductor switch is automatically effected.
Inventors
- 👤 Saburo Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:14
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/02; H01F29/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
A tap changing system for regulating transformers comprising a plurality of vacuum switches interposed between a lead on the load side and two pairs of tap selectors belonging to the odd number taps and the even number taps of tap windings respectively, a semiconductor switch conductive on AC, a high impedance bypass circuit for said semiconductor switch utilizing voltage build-up rate reduction circuit comprising a capacitor, a damping resistor and a silicon diode, and a circuit device having therein a current limiting resistor connected in series to said semicon-ductor switch, said circuit device being connected between a lead on the load side and a selector switch and. arranged to be switchable in parallel to said two vacuum switches, wherein on-load tap changing by one resistor method being performed during correlative switch-on and switch-off operation of said two vacuum switches.
Claim 2
Dependent Claim
139 words
A tap changing system for regulating transformers comprising a plurality of vacuum switches interposed between a lead on the load side and two pairs of tap selectors belonging to the odd number taps and the even number taps of tap windings respectively, a semiconductor switch conductive on AC, a high impedance bypass circuit for said semiconductor switch utilizing voltage build-up rate reduction circuit comprising a capacitor, a damping resistor and a silicon diode, and a circuit device having therein a current limiting resistor connected in series to said semicon-ductor switch, said circuit device being connected between a lead on the load side and a selector switch and. arranged to be switchable in parallel to said two vacuum switches, wherein on-load tap changing by one resistor method being performed during correlative switch-on and switch-off operation of said two vacuum switches.
Claim 3
Dependent Claim
31 words
A tap changing system for regulating transformers as claimed in claim 1, wherein said circuit device is connected stationarily in parallel to one of the side of said two vacuum switches.
Claim 4
Dependent Claim
175 words
A tap changing system for regulating transformers comprising a plurality of vacuum switches interposed between a lead on the load side and two pairs of tap selectors belonging to the odd number taps and the even number taps of tap windings respectively, a semiconductor controlled switch conductive on AC, a high impedance bypass circuit for said semiconductor switch utilizing voltage build-up rate reduction circuit comprising a capacitor, a damping resistor and a silicon diode, a gate control device for said semiconductor controlled switch, said gate control device including control means utilizing the secondary rise current of current transformer inserted in the circuit of said high impedance bypass circuit, and a circuit device having therein a current limiting resistor connected in series to said semiconductor controlled switch, said circuit device being connected between a lead on the load side and a selector switch and. arranged to be switchable in parallel to said two vacuum switches, wherein on-load tap changing by one Resistor method being performed during correlative switch-on and switch-off operation of said two vacuum switches.
Claim 5
Dependent Claim
175 words
A tap changing system for regulating transformers comprising a plurality of vacuum switches interposed between a lead on the load side and two pairs of tap selectors belonging to the odd number taps and the even number taps of tap windings respectively, a semiconductor controlled switch conductive on AC, a high impedance bypass circuit for said semiconductor switch utilizing voltage build-up rate reduction circuit comprising a capacitor, a damping resistor and a silicon diode, a gate control device for said semiconductor controlled switch, said gate control device including control means utilizing the secondary rise current of current transformer inserted in the circuit of said high impedance bypass circuit, and a circuit device having therein a current limiting resistor connected in series to said semiconductor controlled switch, said circuit device being connected between a lead on the load side and a selector switch and. arranged to be switchable in parallel to said two vacuum switches, wherein on-load tap changing by one Resistor method being performed during correlative switch-on and switch-off operation of said two vacuum switches.
Claim 6
Dependent Claim
240 words
A tap changing system for regulating transformers comprising a plurality of of vacuum switches interposed between a lead on the load side and two pairs of tap selectors belonging to the odd number taps and the even number taps of tap windings respectively, a first semiconductor controlled switch conductive on AC, a high impedance bypass circuit for said semiconductor switch utilizing voltage build-u rate reduction circuit comprising a capacitor, a damping resistor and a silicon diode, a gate control device for said first semiconductor controlled switch, said gate control device including control means utilizing the secondary rise current of transformer inserted in the circuit of said high impedance bypass circuit, a second semiconductor controlled switch conductive on AC, gate control device for said second semiconductor controlled switch, said gate control devices including control means utilizing the secondary current of current transformers inserted in the circuit of said vacuum switches, and a circuit device having therein a current limiting resistor connected in series to said first semiconductor controlled switch and said second semiconductor controlled switch connected in parallel to both of said current limiting resistor and said first semi-conductor controlled switch, said circuit device being connected between a lead on the load side and a selector switch and. arranged to be switchable in parallel to said two vacuum switches switch, wherein non-arc tap changing by one resistor method being performed during correlative switch-on and switch-off operation of said two vacuum switches.
Claim 7
Dependent Claim
240 words
A tap changing system for regulating transformers comprising a plurality of of vacuum switches interposed between a lead on the load side and two pairs of tap selectors belonging to the odd number taps and the even number taps of tap windings respectively, a first semiconductor controlled switch conductive on AC, a high impedance bypass circuit for said semiconductor switch utilizing voltage build-u rate reduction circuit comprising a capacitor, a damping resistor and a silicon diode, a gate control device for said first semiconductor controlled switch, said gate control device including control means utilizing the secondary rise current of transformer inserted in the circuit of said high impedance bypass circuit, a second semiconductor controlled switch conductive on AC, gate control device for said second semiconductor controlled switch, said gate control devices including control means utilizing the secondary current of current transformers inserted in the circuit of said vacuum switches, and a circuit device having therein a current limiting resistor connected in series to said first semiconductor controlled switch and said second semiconductor controlled switch connected in parallel to both of said current limiting resistor and said first semi-conductor controlled switch, said circuit device being connected between a lead on the load side and a selector switch and. arranged to be switchable in parallel to said two vacuum switches switch, wherein non-arc tap changing by one resistor method being performed during correlative switch-on and switch-off operation of said two vacuum switches.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |