US3815006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System to deenergize motor responsive to current
Assignee: Franklin Electric Co Inc
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Filing: 1972-07-14
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Granted: 1974-06-04
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Expires: 1992-07-14
Abstract
Abstract This disclosure deals with a telemetry system adapted to be coupled to power transmission lines, the system generating pulses at one location on the lines and detecting such pulses at another location. The system is designed for use with transmission lines carrying alternating current from a power supply to a plurality of loads connected in parallel branch lines, and includes one or more pulse generators, each of which is associated with one load and, when energized, generates a series of pulses. The system also includes one or more pulse detectors each of which is coupled by current transformer means to branch lines leading to a load. The impedance of the power supply is much less than that of each of the loads, and therefore pulses generated on one of the branch lines are not sensed by detectors on the other branch lines because the supply serves as a low impedance shunt path across the other branch lines.
Inventors
- 👤 R Woods
- 👤 W Hohman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:53
CPC Classifications
H; H02; H02J; H02J13/00; H02J13/13; H02J13/1311; H02J13/1313; Y; Y02; Y02B; Y02B90/00; Y02B90/20; Y02E; Y02E60/00; Y04; Y04S; Y04S40/00; Y04S40/12; Y04S40/121
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
112 words
A telemetry system for use in AC power apparatus including a power supply, power lines leading from said supply, and a plurality of loads, said loads being connected in parallel branch lines extending from said power lines, said telemetry system comprising generator means adapted to be connected to one of said branch lines and to generate pulses thereon, and detector means for detecting said pulses, said detector means including current transformer means adapted to be inductively coupled to the conductors of said one branch line and to have a signal induced therein by each of said pulses, and signal responsive means connected to said current transformer means and responding to said signals.
Claim 2
Dependent Claim
112 words
A telemetry system for use in AC power apparatus including a power supply, power lines leading from said supply, and a plurality of loads, said loads being connected in parallel branch lines extending from said power lines, said telemetry system comprising generator means adapted to be connected to one of said branch lines and to generate pulses thereon, and detector means for detecting said pulses, said detector means including current transformer means adapted to be inductively coupled to the conductors of said one branch line and to have a signal induced therein by each of said pulses, and signal responsive means connected to said current transformer means and responding to said signals.
Claim 3
Dependent Claim
24 words
A system as in claim 1, wherein said power supply has a relatively low impedance compared to the impedance of each of said loads.
Claim 4
Dependent Claim
92 words
In AC power apparatus including a power supply, power lines leading from said supply, a plurality of loads, said loads being connected by said lines to said power supply, and generator means for generating pulses on said lines, the improvement of detector means for detecting said pulses, said detector means comprising current transformer means adapted to be inductively coupled to the conductors of said line and to have a signal induced therein by each of said pulses, and signal responsive means connected to said current transformer means and responding to said signals.
Claim 5
Dependent Claim
92 words
In AC power apparatus including a power supply, power lines leading from said supply, a plurality of loads, said loads being connected by said lines to said power supply, and generator means for generating pulses on said lines, the improvement of detector means for detecting said pulses, said detector means comprising current transformer means adapted to be inductively coupled to the conductors of said line and to have a signal induced therein by each of said pulses, and signal responsive means connected to said current transformer means and responding to said signals.
Claim 6
Dependent Claim
30 words
A system as in claim 3, wherein said detector means further includes limiting means for preventing said detector from responding to signals having a magnitude smaller than a predetermined value.
Claim 7
Dependent Claim
35 words
A system as in claim 3, wherein said detector further includes a shunting capacitor adapted to be connected across said conductors of said branch line on the power supply side of said current transformer means.
Claim 8
Dependent Claim
39 words
A system as in claim 3, wherein said detector means further includes integrating means responsive to said signals, and trigger means connected to said integrating means and being triggered when the integral of said signals reaches a predetermined value.
Claim 9
Dependent Claim
41 words
A system as in claim 6, wherein said detector means further includes signal shaping means connected between said current transformEr means and said integrating means and producing a signal having a substantially fixed amplitude and width for each of said pulses.
Claim 10
Dependent Claim
23 words
A system as in claim 3, and further including power means for said detector means, said power means being coupled to said conductors.
Claim 11
Dependent Claim
26 words
A system as in claim 3, and further including power means for said detector means, said power means including current transformer means coupled to said conductors.
Claim 12
Dependent Claim
30 words
A system as in claim 9, wherein said current transformer means of said power means and said current transformer means of said detector means are parts of the same structure.
Claim 13
Dependent Claim
41 words
A system as in claim 3, wherein said pulses have a relatively high frequency, and said detector means further includes a high pass filter connected ahead of said signal responsive means for passing said signals but blocking the AC power frequency.
Claim 14
Dependent Claim
137 words
In a telemetry system for generating pulses in AC power apparatus including an AC supply, a load and at least two conductors connecting said load to said supply, the improvement of a generator for generating pulses on said conductors, comprising switch means and a first capacitor connected in series and adapted to be connected across said conductors, said switch means including a gate which closes said switch means in response to the receipt of an electrical signal, trigger means connected to said gate and passing a signal to said gate when the voltage across said trigger means reaches a predetermined value, a second capacitor adapted to be charged by the voltage on said conductors and connected to said trigger means, and variable impedance means connected to said second capacitor for varying the charge on said second capacitor.
Claim 15
Dependent Claim
137 words
In a telemetry system for generating pulses in AC power apparatus including an AC supply, a load and at least two conductors connecting said load to said supply, the improvement of a generator for generating pulses on said conductors, comprising switch means and a first capacitor connected in series and adapted to be connected across said conductors, said switch means including a gate which closes said switch means in response to the receipt of an electrical signal, trigger means connected to said gate and passing a signal to said gate when the voltage across said trigger means reaches a predetermined value, a second capacitor adapted to be charged by the voltage on said conductors and connected to said trigger means, and variable impedance means connected to said second capacitor for varying the charge on said second capacitor.
Claim 16
Dependent Claim
16 words
Apparatus as in claim 12, wherein said variable impedance means is connected across said second capacitor.
Claim 17
Dependent Claim
24 words
Apparatus as in claim 12, wherein said variable impedance means comprises at least one PTC resistor mounted in heat conducting relation with said load.
Claim 18
Dependent Claim
40 words
Apparatus as in claim 12, wherein said variable impedance means comprises a fixed resistor and at least one variable resistor, said resistors being adapted to be connected across said conductors, and said variable resistor being connected across said first capacitor.
Claim 19
Dependent Claim
168 words
In a telemetry system for generating pulses in AC power apparatus including an AC supply, a load and at least two conductors connecting said load to said supply, the improvement of a generator for generating pulses on said conductors, comprising a breakdown device and a capacitor connected in series and adapted to be connected across said conductors, said device having a breakdown voltage at which it conducts, heat sensitive variable impedance means connected to have a potential applied thereto, said impedance means being adapted to be mounted in heat transfer relation with said load, said impedance means having a first resistance at normal load temperatures and a second resistance at high load temperatures, said impedance means being connected to said breakdown device to apply a potential thereacross, said potential at said first resistance being less than said breakdown voltage but being greater than said breakdown voltage at said second resistance, whereby said breakdown device conducts and thereby generates current pulses on said conductors only at high load temperatures.
Claim 20
Dependent Claim
168 words
In a telemetry system for generating pulses in AC power apparatus including an AC supply, a load and at least two conductors connecting said load to said supply, the improvement of a generator for generating pulses on said conductors, comprising a breakdown device and a capacitor connected in series and adapted to be connected across said conductors, said device having a breakdown voltage at which it conducts, heat sensitive variable impedance means connected to have a potential applied thereto, said impedance means being adapted to be mounted in heat transfer relation with said load, said impedance means having a first resistance at normal load temperatures and a second resistance at high load temperatures, said impedance means being connected to said breakdown device to apply a potential thereacross, said potential at said first resistance being less than said breakdown voltage but being greater than said breakdown voltage at said second resistance, whereby said breakdown device conducts and thereby generates current pulses on said conductors only at high load temperatures.
Claim 21
Dependent Claim
22 words
Apparatus as in claim 16, wherein said variable impedance means is adapted to be connected to have AC line power applied thereto.
Claim 22
Dependent Claim
29 words
Apparatus as in claim 16, wherein said variable impedance means increases in resistance with an increase in the temperature thereof and is connected in parallel with said breakdown device.
Claim 23
Dependent Claim
16 words
Apparatus as in claim 18, wherein said variable impedance means comprises at least one PTC resistor.
Claim 24
Dependent Claim
12 words
Apparatus as in claim 16, wherein said breakdown device comprises spark-gap means.
Claim 25
Dependent Claim
25 words
Apparatus as in claim 16, wherein said breakdown device comprises a TRIAC and a DIAC, said DIAC being conneCted to the gate of said TRIAC.
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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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |