Patent US4723220A successfully refreshed from Google Patents.
US4723220A
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Apparatus for power measuring and calculating Fourier components of power line parameters
Assignee: UNDERSGROUND SYSTEMS Inc
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Filing: 1986-03-20
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Granted: 1988-02-02
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Expires: 2006-03-20
Abstract
Abstract Self contained radio transmitting state estimator modules are mounted on power conductors on both sides of power transformers in electrical substations and on power conductors at various places along electrical transmission lines. They are electrically isolated from ground and all other conductors. These modules are capable of measuring current, voltage, frequency and power factor (or the fourier components thereof) the temperature of the conductor, and the temperature of the ambient air. The modules transmit these parameters to local receivers. The receivers are connected by an appropriate data transmission link, to a power control center which allows determination of the state of the power system. The module measures the Fourier components of voltage and current over a number of cycles and transmits the components to the local receiver.
Inventors
- 👤 William R. Smith-Vaniz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:27
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/14; G01K1/143; G01K1/02; G01K1/024; G01R; G01R15/00; G01R15/14; G01R15/142; H; H02; H02J; H02J13/00; H02J13/12; H02J13/13; H02J13/1331; H02J13/18; H02J13/333; Y; Y02; Y02E; Y02E60/00; Y04; Y04S; Y04S10/00; Y04S10/30; Y04S40/00; Y04S40/12; Y04S40/126
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
169 words
Apparatus for measuring at least one characteristic of a power line conductor comprising: a housing removably attachable to said conductor; means for measuring the amplitude of at least one cyclic characteristic of power transmitted on said conductor; said means for measuring including means for timing amplitude measurements such that said measurements occur at a plurality of different intervals within the period of a cycle of said cyclic characteristic; said timing means including means for delaying said measurements by a fixed time interval such that each of said measurements is taken in a different cycle for a plurality of cycles; and wherein said measurements are taken over a period of n cycles with the time duration of each cycle equaling t and said fixed time interval between measurements equaling t+(1/n)t; means for calculating Fourier components of said cyclic characteristic from said measurements; means for transmitting said Fourier components to a remote receiver; and said means for measuring, means for calculating and means for transmitting each being contained in said housing.
Claim 2
Dependent Claim
169 words
Apparatus for measuring at least one characteristic of a power line conductor comprising: a housing removably attachable to said conductor; means for measuring the amplitude of at least one cyclic characteristic of power transmitted on said conductor; said means for measuring including means for timing amplitude measurements such that said measurements occur at a plurality of different intervals within the period of a cycle of said cyclic characteristic; said timing means including means for delaying said measurements by a fixed time interval such that each of said measurements is taken in a different cycle for a plurality of cycles; and wherein said measurements are taken over a period of n cycles with the time duration of each cycle equaling t and said fixed time interval between measurements equaling t+(1/n)t; means for calculating Fourier components of said cyclic characteristic from said measurements; means for transmitting said Fourier components to a remote receiver; and said means for measuring, means for calculating and means for transmitting each being contained in said housing.
Claim 3
Dependent Claim
18 words
Apparatus as defined in claim 1 further including means for measuring conductor temperature, conductor voltage, and conductor current.
Claim 4
Dependent Claim
24 words
Apparatus as defined in claim 2 wherein said measurements are analog values and including processing means for converting said analog values into digital values.
Claim 5
Dependent Claim
28 words
Apparatus as defined in claim 3 wherein said processing means includes means for forming said digital values into a digital message to be transmitted to said remote receiver.
Claim 6
Dependent Claim
25 words
Apparatus as defined in claim 4 wherein said data message includes an apparatus identification number, a voltage value, a current value, and an auxiliary value.
Claim 7
Dependent Claim
21 words
Apparatus as defined in claim 5 wherein said auxiliary value is one of a number of selectable characteristics including conductor temperature.
Claim 8
Dependent Claim
32 words
Apparatus as defined in claim 6 wherein said one of a number of selectable characteristics represented by said auxiliary value is identified by an auxiliary parameter number included in said data message.
Claim 9
Dependent Claim
35 words
Apparatus as defined in claim 7 wherein an auxiliary value corresponding to a different selectable characteristic is transmitted on each successive transmission and the auxiliary parameter number rotates among the numbers identifying said selectable characteristics.
Claim 10
Dependent Claim
46 words
Apparatus as defined in claim 3 further including central timing means and wherein said means for processing and said means for transmitting are controlled by said central timing means and said central timing means is synchronized to the zero-crossings of alternating current carried on said conductor.
Claim 11
Dependent Claim
31 words
Apparatus as defined in claim 4 wherein said processing means includes means for calculating an error check value and said error check value is transmitted as part of said digital message.
Claim 12
Dependent Claim
23 words
Apparatus as defined in claim 1 wherein said means for measuring includes means for converting said measurements from analog values to digital values.
Claim 13
Dependent Claim
36 words
Apparatus as defined in claim 11 wherein said means for calculating Fourier components includes means for computing a check value and said means for transmitting includes means for transmitting said check value with said Fourier components.
Claim 14
Dependent Claim
49 words
Apparatus as defined in claim 12 wherein said receiver includes means for calculating a check value, means for comparing said calculated check value to said check value transmitted with said Fourier components, and means for disregarding said transmitted Fourier components if said compared check values are not the same.
Claim 15
Dependent Claim
19 words
Apparatus as defined in claim 1 wherein said means for measuring measures the amplitude of voltage and current simultaneously.
Claim 16
Dependent Claim
31 words
Apparatus as defined in claim 14 wherein said receiver receives the Fourier components of voltage and current and includes means for calculating real and reactive power values from said received components.
Claim 17
Dependent Claim
14 words
Apparatus as defined in claim 1 wherein said cyclic characteristic of power is voltage.
Claim 18
Dependent Claim
14 words
Apparatus as defined in claim 1 wherein said cyclic characteristic of power is current.
Claim 19
Dependent Claim
132 words
Apparatus for measuring at least one characteristic of a power line conductor comprising: means for measuring the amplitude of at least one cyclic characteristic of power transmitted on said conductor; means for controlling said means for measuring such that said measurements occur at a plurality of different intervals within the period of a cycle of said cyclic characteristic; said means for controlling including means for delaying said measurements by a fixed time interval such that each of said measurements is taken in a different cycle for a plurality of cycles; means for calculating Fourier components of said cyclic characteristic from said measurements; and wherein said measurements are taken over a period of n cycles with the time duration of each cycle equaling t and said fixed time interval between measurements equaling t+(1/n)t.
Claim 20
Dependent Claim
132 words
Apparatus for measuring at least one characteristic of a power line conductor comprising: means for measuring the amplitude of at least one cyclic characteristic of power transmitted on said conductor; means for controlling said means for measuring such that said measurements occur at a plurality of different intervals within the period of a cycle of said cyclic characteristic; said means for controlling including means for delaying said measurements by a fixed time interval such that each of said measurements is taken in a different cycle for a plurality of cycles; means for calculating Fourier components of said cyclic characteristic from said measurements; and wherein said measurements are taken over a period of n cycles with the time duration of each cycle equaling t and said fixed time interval between measurements equaling t+(1/n)t.
Claim 21
Dependent Claim
19 words
Apparatus as defined in claim 18 wherein said means for measuring measures the amplitude of voltage and current simultaneously.
Claim 22
Dependent Claim
22 words
Apparatus as defined in claim 19 further including means for transmitting said Fourier components of voltage and current to a remote receiver.
Claim 23
Dependent Claim
22 words
Apparatus as defined in claim 20 wherein said receiver includes means for calculating real and reactive power from said received Fourier components.
Claim 24
Dependent Claim
37 words
Apparatus as defined in claim 21 further including a housing removably attachable to said conductor, said means for measuring, means for controlling, means for calculating Fourier components and means for transmitting each being contained in said housing.
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USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |