US5019956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power control apparatus
Assignee: Terasaki Electric Co Ltd
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Filing: 1989-11-14
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Granted: 1991-05-28
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Expires: 2009-11-14
Abstract
Abstract In this power control apparatus, a current flowing in a main current (201) is detected by a current transformer (202) and a zero-phase current transformer (203), provided in the main circuit. A value of this current is provided to a CPU (214) included in an intelligent controller (207). A maximum peak value and the like are evaluated by the CPU to be compared with predetermined set values. If those values are equal to or higher than the set values, an excitation signal is applied to a tripping device (205) to release a latch by a latch scheme (206) and thus to trip the circuit breaker. The CPU alters the set value when supplied with a setting alteration instruction from a central monitor (40), and causes the circuit breaker to be tripped when supplied with a stop instruction therefrom.
Inventors
- 👤 Katsutoyo Nakayama
- 👤 Toshimichi Morii
- 👤 Toshihide Kamino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:07
CPC Classifications
H; H02; H02H; H02H3/00; H01; H01H; H01H71/00; H01H2071/006; H01H2300/00; H01H2300/03; H01H89/00; H01H89/06; H02H3/006; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y02B90/00; Y02B90/20; Y04; Y04S; Y04S20/00; Y04S20/14; Y04S20/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
277 words
A power control apparatus for controlling the supply of plural phase electrical power to a main circuit, comprising: circuit breaking means having contacts connected in said main circuit and selectively operable to close said contacts for supplying said electrical power to said main circuit and to open said contacts and thereby break the supply of electrical power to said main circuit, and to switch said contacts between open and closed conditions; means for detecting the present level of current flowing in said main circuit and providing a corresponding, current level detection output; setting means for setting a predetermined current level value and predetermined conditions relating to breaking of the main circuit when the present current level exceeds the predetermined current level set value; means for supplying switching instructions for switching of said circuit breaking means; control means responsive to said switching instructions for controlling said circuit breaking means to switch between said open and closed conditions of said contacts and further responsive to the set values of said setting means and the current level detection output of said detecting means for generating a current level monitor signal and, in response to the current level in said main circuit exceeding said predetermined current level set value, for generating an output signal in accordance with said predetermined conditions; tripping means, responsive to the output signal of said control means, for operating said circuit breaking means to break the main circuit; and display means for receiving and displaying the predetermined current level set value from the setting means and for receiving the current level monitor signal output of said control means and displaying the corresponding present main circuit current value.
Claim 2
Dependent Claim
277 words
A power control apparatus for controlling the supply of plural phase electrical power to a main circuit, comprising: circuit breaking means having contacts connected in said main circuit and selectively operable to close said contacts for supplying said electrical power to said main circuit and to open said contacts and thereby break the supply of electrical power to said main circuit, and to switch said contacts between open and closed conditions; means for detecting the present level of current flowing in said main circuit and providing a corresponding, current level detection output; setting means for setting a predetermined current level value and predetermined conditions relating to breaking of the main circuit when the present current level exceeds the predetermined current level set value; means for supplying switching instructions for switching of said circuit breaking means; control means responsive to said switching instructions for controlling said circuit breaking means to switch between said open and closed conditions of said contacts and further responsive to the set values of said setting means and the current level detection output of said detecting means for generating a current level monitor signal and, in response to the current level in said main circuit exceeding said predetermined current level set value, for generating an output signal in accordance with said predetermined conditions; tripping means, responsive to the output signal of said control means, for operating said circuit breaking means to break the main circuit; and display means for receiving and displaying the predetermined current level set value from the setting means and for receiving the current level monitor signal output of said control means and displaying the corresponding present main circuit current value.
Claim 3
Dependent Claim
65 words
A power control apparatus as recited in claim 1, wherein said switching instruction supplying means comprises communication means for receiving switching instructions from source means, external of said apparatus, for supply to said control means, said control means responding to said externally supplied switching instructions for controlling the operation of said circuit breaking means for switching said contacts thereof between said open and closed conditions.
Claim 4
Dependent Claim
72 words
A power control apparatus as recited in claim 1, wherein said circuit breaking means comprises: mechanical latch means having reset and released conditions and operable in said reset condition to permit said circuit breaking means to switch the contacts thereof to said closed condition; and said mechanical latch means being operated by said tripping means to said released condition for, in turn, operating said circuit breaking means to break the main circuit.
Claim 5
Dependent Claim
17 words
A power control apparatus as recited in claim 3, further comprising means for resetting said latch means.
Claim 6
Dependent Claim
17 words
A power control apparatus as recited in claim 4 wherein said resetting means comprises manual resetting means.
Claim 7
Dependent Claim
25 words
A power control apparatus as recited in claim 4 wherein said resetting means is responsive to and operated by an output of said control means.
Claim 8
Dependent Claim
43 words
A power control apparatus as recited in claim 6 wherein said circuit breaking means is operable in response to an output signal of said control means, in the reset condition of said latch means, for switching said contacts thereof to said closed condition.
References Cited (Backward Citations)
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Cited
GB2073969A
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GB2073973A
Cited
US4710845A
Cited
US4780786A
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EP0284198A2
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US4819124A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |