US4803635A
Expired / Lapsed
US
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Information data output device for electric-power systems
Assignee: Toshiba Corp
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Filing: 1986-11-06
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Granted: 1989-02-07
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Expires: 2006-11-06
Abstract
Abstract According to the present invention, a sampled value of a reference voltage V p which is a voltage (in general, a relative voltage to ground, an interphase voltage or a positive sequence voltage) prior to the occurrence of a fault in an electric-power system and a sampled value of the quantity of electricity E (a voltage or current in each phase or a symmetrical component voltage or current) during a fault time period or after the recovery of a fault are used to compute a plurality of functional values capable of specifying the phase angle θ or the value of θ of said quantity of electricity E in relation to said reference voltage V p and deliver them as information data. When the relative phase angle between the quantity of electricity E during a fault or after the recovery of a fault and a voltage (reference voltage) V p prior to the occurrence of a fault is clarified in this manner, the relative phase angles of reference voltages V p among a plurality of electric stations prior to the occurrence of a fault are computed by obtaining the information of normal operating conditions of the electric power system concerning to a voltage, current, reactive power and the state of a circuit breaker and accomplishing the arithmetic operations of the information thus obtained and the constants of devices and equipment constituting the electric-power system. Therefore, the relative phase angles of the quantity of electricity E among a plurality of electric stations during a fault period or after the recovery of a fault can be clarified.
Inventors
- 👤 Fumio Andow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:52
CPC Classifications
G; G06; G06F; G06F17/00; H; H02; H02H; H02H7/00; H02H7/26; H02H3/00; H02H3/38; H02H3/382
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
186 words
A method for obtaining information data in the form of a digital data obtained from an electric power system through detection of a fault in the system, comprising the steps of: initiating an operation of fault detection; judging whether or not a predetermined time has passed since initiating the operation of fault detection; sampling data from said electric power system a predetermined number of times for each cycle of an electric quantity of said electric power system so as to produce sampled data successively; rewriting a reference voltage data by another reference voltage data produced from the sampled data until said predetermined time has passed; detecting a fault from the sampled data when said predetermined time has passed; judging whether or not an output command exists when the fault is detected; computing information data according to a predetermined formula when the output command exists, outputting the result obtained by computation according to the output command; rewriting the reference voltage data by another reference voltage data produced from the sampled data; rewriting the sampled data by a new sampled value; and repeating the steps above-mentioned in sequence.
Claim 2
Independent Claim
186 words
A method for obtaining information data in the form of a digital data obtained from an electric power system through detection of a fault in the system, comprising the steps of: initiating an operation of fault detection; judging whether or not a predetermined time has passed since initiating the operation of fault detection; sampling data from said electric power system a predetermined number of times for each cycle of an electric quantity of said electric power system so as to produce sampled data successively; rewriting a reference voltage data by another reference voltage data produced from the sampled data until said predetermined time has passed; detecting a fault from the sampled data when said predetermined time has passed; judging whether or not an output command exists when the fault is detected; computing information data according to a predetermined formula when the output command exists, outputting the result obtained by computation according to the output command; rewriting the reference voltage data by another reference voltage data produced from the sampled data; rewriting the sampled data by a new sampled value; and repeating the steps above-mentioned in sequence.
Claim 3
Dependent Claim
89 words
The method of claim 1, wherein said first sampled data representing a reference voltage Vp is obtained from a specific point J on a transmission line through simulation based on a voltage Vs at an electric station for obtaining an information data concerning a quantity of electricity E, a current is flowing through said transmission line extended from said electric station and constants A and Z of said transmission line between said specific point J on said transmission line and said electric station according to the following equation Vp=AVs-ZIs.
Claim 4
Dependent Claim
50 words
The method of claim 1, wherein a first sampled data before a fault occurs and a second sampled data after the fault occurred, obtained from the electric power system, are used to deliver the information data of at least a phase angle J between the first and second sampled data.
Claim 5
Dependent Claim
24 words
The method of claim 3, wherein said first sampled data represents a reference value, and said second sampled data represents detected quantity of electricity.
Claim 6
Dependent Claim
25 words
The method of claim 3, wherein said first sampled data represents a value immediately before the occurrence of a fault detected by a fault detection.
Claim 7
Dependent Claim
25 words
The method of claim 3, wherein one of said sampled data specifying said phase angle J includes sin J while the other includes cos J.
Claim 8
Dependent Claim
32 words
A method of claim 3, wherein one of said sampled data specifying said phase angle J includes cos J or sin J while the other includes tan J or cot J, respectively.
Claim 9
Independent Claim
184 words
A method for outputting information data in the form of a digital data obtained from an electric power system through detection of a fault in the system, comprising the steps of: initiating an operation of fault detection; judging whether or not a predetermined time has passed since initiating the operation of fault detection; sampling data from said electric power system a predetermined number of times for each cycle of an electric quantity of said electric power system so as to produce sampled data successively; rewritting a reference voltage data by another reference voltage data produced from the sampled data until said predetermined time has passed; detecting a fault from the sampled data when said predetermined time has passed; storing a hold command when the fault is detected; outputting the sampled data obtained within a second predetermined time after the fault is detected; periodically outputting the sampled data for a third predetermined time after said second predetermined time; resetting the hold command after the third predetermined time has passed; rewriting the sampled data by a new sampled value; and repeating the steps above-mentioned in sequence.
Claim 10
Independent Claim
184 words
A method for outputting information data in the form of a digital data obtained from an electric power system through detection of a fault in the system, comprising the steps of: initiating an operation of fault detection; judging whether or not a predetermined time has passed since initiating the operation of fault detection; sampling data from said electric power system a predetermined number of times for each cycle of an electric quantity of said electric power system so as to produce sampled data successively; rewritting a reference voltage data by another reference voltage data produced from the sampled data until said predetermined time has passed; detecting a fault from the sampled data when said predetermined time has passed; storing a hold command when the fault is detected; outputting the sampled data obtained within a second predetermined time after the fault is detected; periodically outputting the sampled data for a third predetermined time after said second predetermined time; resetting the hold command after the third predetermined time has passed; rewriting the sampled data by a new sampled value; and repeating the steps above-mentioned in sequence.
Claim 11
Independent Claim
197 words
A method for outputting information data in the form of a digital data obtained from an electric power system through detection of a fault in the system, comprising the steps of: initiating an operation of fault detection; judging whether or not a predetermined time has passed since initiating the operation of fault detection; sampling data from said electric power system a predetermined number of times for each cycle of an electric quantity of said electric power system so as to produce sampled data successively; rewriting a reference voltage data by another reference voltage data produced from the sampled data until said predetermined time has passed; receiving a fault detection signal; computing information data after a second predetermined time passes since the reception of the fault detection signal; outputting the result obtained by the computation; periodically computing information data for a third predetermined time following the fault detection signal; periodically outputting a result obtained by the computation during the third predetermined time; rewriting the reference voltage data by another reference voltage data produced from the sampled data when said result is outputted; rewriting the sampled data by a new sampled value; and repeating the steps above-mentioned in sequence.
Claim 12
Independent Claim
197 words
A method for outputting information data in the form of a digital data obtained from an electric power system through detection of a fault in the system, comprising the steps of: initiating an operation of fault detection; judging whether or not a predetermined time has passed since initiating the operation of fault detection; sampling data from said electric power system a predetermined number of times for each cycle of an electric quantity of said electric power system so as to produce sampled data successively; rewriting a reference voltage data by another reference voltage data produced from the sampled data until said predetermined time has passed; receiving a fault detection signal; computing information data after a second predetermined time passes since the reception of the fault detection signal; outputting the result obtained by the computation; periodically computing information data for a third predetermined time following the fault detection signal; periodically outputting a result obtained by the computation during the third predetermined time; rewriting the reference voltage data by another reference voltage data produced from the sampled data when said result is outputted; rewriting the sampled data by a new sampled value; and repeating the steps above-mentioned in sequence.
Claim 13
Independent Claim
191 words
A device for outputting information data in the form of a digital data obtained from an electric power system through detection of a fault in the system comprising: initiating means for initiating an operation of fault detection; operation judging means for judging whether or not a predetermined time passes since initiating the operation of fault detection; sampling means for sampling data from said electric power system a predetermined number of times for each cycle of an electric quantity of said electric power system so as to produce sampled data successively; reference data rewriting means for rewriting a reference data by another reference voltage data produced from the sampled data until said predetermined time passes; detecting means for detecting a fault from the sampled data when said predetermined time passes; command judging means for judging whether or not an output command exists when the fault is detected; computing means for computing information data according to a predetermined formula when the output command exists; outputting means for outputting a result obtained by computation according to the output command; and sampled data rewriting means for rewriting the sampled data by a new sampled data.
Claim 14
Independent Claim
191 words
A device for outputting information data in the form of a digital data obtained from an electric power system through detection of a fault in the system comprising: initiating means for initiating an operation of fault detection; operation judging means for judging whether or not a predetermined time passes since initiating the operation of fault detection; sampling means for sampling data from said electric power system a predetermined number of times for each cycle of an electric quantity of said electric power system so as to produce sampled data successively; reference data rewriting means for rewriting a reference data by another reference voltage data produced from the sampled data until said predetermined time passes; detecting means for detecting a fault from the sampled data when said predetermined time passes; command judging means for judging whether or not an output command exists when the fault is detected; computing means for computing information data according to a predetermined formula when the output command exists; outputting means for outputting a result obtained by computation according to the output command; and sampled data rewriting means for rewriting the sampled data by a new sampled data.
Claim 15
Independent Claim
203 words
A device for outputting information data in the form of a digital data obtained from an electric power system through detection of a fault in the system comprising: initiating means for initiating an operation of fault detection; operation judging means for judging whether or not a predetermined time passes since initiating the operation of fault detection; sampling means for sampling data from said electric power system a predetermined times for each cycle of an electric quantity of said electric power system so as to produce sampled data successively; reference data rewriting means for rewriting a reference data by another reference voltage data produced from the sampled data until said predetermined time passes; detecting means for detecting a fault from the sampled data when said predetermined time passes; storing means for storing a hold command when a fault detection signal is applied from said detecting means; outputting means for outputting the sampled data from said sampling means within a second predetermined time in which the fault is detected, and for periodically outputting the sampled data for a third predetermined time after the second predetermined time: and resetting means for resetting the hold command in said storing means after the third predetermined time has passed.
Claim 16
Independent Claim
203 words
A device for outputting information data in the form of a digital data obtained from an electric power system through detection of a fault in the system comprising: initiating means for initiating an operation of fault detection; operation judging means for judging whether or not a predetermined time passes since initiating the operation of fault detection; sampling means for sampling data from said electric power system a predetermined times for each cycle of an electric quantity of said electric power system so as to produce sampled data successively; reference data rewriting means for rewriting a reference data by another reference voltage data produced from the sampled data until said predetermined time passes; detecting means for detecting a fault from the sampled data when said predetermined time passes; storing means for storing a hold command when a fault detection signal is applied from said detecting means; outputting means for outputting the sampled data from said sampling means within a second predetermined time in which the fault is detected, and for periodically outputting the sampled data for a third predetermined time after the second predetermined time: and resetting means for resetting the hold command in said storing means after the third predetermined time has passed.
Claim 17
Independent Claim
160 words
A device for outputting information data in the form of a digital data obtained from an electric power system through detection of a fault in the system comprising: initiating means for initiating an operation of fault detection; operation judging means for judging whether or not a predetermined time passes since initiating the operation of fault detection; sampling means for sampling data from said electric power system a predetermined number of times for each cycle of an electric quantity of said electric power system so as to produce sampled data successively; reference data rewriting means for rewriting a reference data by another reference voltage data produced from the sampled data until said predetermined time passes; computing means for computing information data according to the fault detection signal as applied from said detecting means and for periodically computing the information data for a third predetermined time after the fault detection signal; and outputting means for outputting results provided by said computing means.
Claim 18
Independent Claim
160 words
A device for outputting information data in the form of a digital data obtained from an electric power system through detection of a fault in the system comprising: initiating means for initiating an operation of fault detection; operation judging means for judging whether or not a predetermined time passes since initiating the operation of fault detection; sampling means for sampling data from said electric power system a predetermined number of times for each cycle of an electric quantity of said electric power system so as to produce sampled data successively; reference data rewriting means for rewriting a reference data by another reference voltage data produced from the sampled data until said predetermined time passes; computing means for computing information data according to the fault detection signal as applied from said detecting means and for periodically computing the information data for a third predetermined time after the fault detection signal; and outputting means for outputting results provided by said computing means.
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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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |