US3571561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for detecting abnormality in electric heating apparatus of pipe lines
Assignee: JNC Corp
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Filing: 1969-03-10
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Granted: 1971-03-23
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Expires: 1989-03-10
Abstract
Abstract An abnormality-detecting circuit in a long electric heatgenerating apparatus to be attached on pipelines which circuit is so arranged that abnormality can be detected by electrically dividing said heat-generating apparatus into two portions, supplying to each electrically divided portion of said heatgenerating apparatus, voltages of the same phase, which are approximately proportional to the length of said divided portion so as to flow as equal a current through each divided portion as possible, and measuring the difference of the above-mentioned two currents which are normally set as equal as possible.
Inventors
- 👤 Masao Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:42
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/0004; F; F16; F16L; F16L2101/00; F16L2101/30; H05B2214/00; H05B2214/03
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
340 words
An abnormality-detecting circuit for a long distance heatgenerating apparatus inserted between two electrically divided first and second portions of said heat-generating apparatus comprising a first AC source, a conductor line connecting one end of the first AC source to the far end of the first divided portion of said heat-generating apparatus, the first divided portion of said heat-generating apparatus being a pipe, and a conductor line connecting the nearer end of the first divided portion of said heat-generating pipe to the other end of the first AC source, arranged in such order as to flow AC from the one end of the AC source, to the far end of the first divided portion of said heat generating pipe, then to the other end of the first AC source; a second AC source, a conductor line connecting one end of the second AC source to the nearer end of the second divided portion of said heat-generating apparatus, the second divided portion of said heat-generating apparatus being a pipe, a conductor line connecting the far end of the second divided portion of said heat-generating apparatus to the other end of the second AC source, arranged in such order as to flow AC from the one end of the AC source, to the nearer end of the second divided portion of said heat-gn heat-generating apparatus, then to the far end of the second divided portion of said heatgenerating apparatus and further to the other end of second AC source, a part of the above-mentioned conductor line connecting one end of the second AC source to the nearer end of the second divided portion of said heat-generating apparatus forming the common conductor line with a part of the above-mentioned conductor line connecting one end of the first AC source to the near end of the first divided portion of said heat generating apparatus, and a current detecting apparatus inserted in the above-mentioned common conductor line so as to detect the difference of currents flowing through the first divided portion and the second divided portion.
Claim 2
Dependent Claim
340 words
An abnormality-detecting circuit for a long distance heatgenerating apparatus inserted between two electrically divided first and second portions of said heat-generating apparatus comprising a first AC source, a conductor line connecting one end of the first AC source to the far end of the first divided portion of said heat-generating apparatus, the first divided portion of said heat-generating apparatus being a pipe, and a conductor line connecting the nearer end of the first divided portion of said heat-generating pipe to the other end of the first AC source, arranged in such order as to flow AC from the one end of the AC source, to the far end of the first divided portion of said heat generating pipe, then to the other end of the first AC source; a second AC source, a conductor line connecting one end of the second AC source to the nearer end of the second divided portion of said heat-generating apparatus, the second divided portion of said heat-generating apparatus being a pipe, a conductor line connecting the far end of the second divided portion of said heat-generating apparatus to the other end of the second AC source, arranged in such order as to flow AC from the one end of the AC source, to the nearer end of the second divided portion of said heat-gn heat-generating apparatus, then to the far end of the second divided portion of said heatgenerating apparatus and further to the other end of second AC source, a part of the above-mentioned conductor line connecting one end of the second AC source to the nearer end of the second divided portion of said heat-generating apparatus forming the common conductor line with a part of the above-mentioned conductor line connecting one end of the first AC source to the near end of the first divided portion of said heat generating apparatus, and a current detecting apparatus inserted in the above-mentioned common conductor line so as to detect the difference of currents flowing through the first divided portion and the second divided portion.
Claim 3
Dependent Claim
63 words
A circuit according to claim 1 wherein both the conductor line connecting one end of the first AC source to the far end of the first divided portion and the conductor line connecting the far end of the second divided portion to the other end of the second AC sOurce are passes through the inside of the respective portions of the heating apparatus.
Claim 4
Dependent Claim
63 words
A circuit according to claim 1 wherein both the conductor line connecting one end of the first AC source to the far end of the first divided portion and the conductor line connecting the far end of the second divided portion to the other end of the second AC source are provided at the outside of the respective portions of the heating apparatus.
Claim 5
Dependent Claim
435 words
An abnormality-detecting circuit for a long distance heat-generating apparatus inserted between two electrically divided first and second portions of said heat-generating apparatus comprising a first AC source, a conductor line connecting one end of the first AC source to the far end of the first divided portion of said heat-generating apparatus, the first divided portion of said heat-generating apparatus being a pipe, and a conductor line connecting the nearer end of the first divided portion of said heat-generating apparatus to the other end of the first AC source, arranged in such order as to flow AC from the one end of the AC source, to the far end of the first divided portion of said heat generating apparatus, then to the nearer end of the first divided portion and further to the other end of the first AC source; a second AC source, a conductor line connecting one end of the second AC source to the nearer end of the second divided portion of said heat generating apparatus, the second divided portion of said heat-generating apparatus being a pipe, a conductor line connecting the far end of the second divided portion of said heat-generating pipe to the other end of the second AC source, arranged in such order as to flow AC from the one end of the AC source, to the nearer end of the second divided portion of said heat-generating apparatus, then to the far end of the second divided portion of said heat-generating apparatus and further to the other end of the second AC source, a part of the above-mentioned conductor line connecting the one end of the second AC source to the nearer end of the second divided portion of said heat-generating apparatus forming the common conductor line with a part of the above-mentioned conductor line conductor line connecting the one end of the first AC source to the near end of the first divided portion of said heat-generating apparatus and a circuit for detecting difference of the current flowing in the first dividing portion and that of the second divided portion consisting of a first current transformer whose primary side is inserted in the conductor line connecting the first AC source to the first divided portion, a current difference detecting apparatus and a second current transformer whose primary side is inserted in the conductor line connecting the second divided portion to the second AC source so as to flow current from the secondary side of the first transformer to the current difference detecting apparatus and further from the secondary side of the second transformer to the current difference detecting apparatus.
Claim 6
Dependent Claim
435 words
An abnormality-detecting circuit for a long distance heat-generating apparatus inserted between two electrically divided first and second portions of said heat-generating apparatus comprising a first AC source, a conductor line connecting one end of the first AC source to the far end of the first divided portion of said heat-generating apparatus, the first divided portion of said heat-generating apparatus being a pipe, and a conductor line connecting the nearer end of the first divided portion of said heat-generating apparatus to the other end of the first AC source, arranged in such order as to flow AC from the one end of the AC source, to the far end of the first divided portion of said heat generating apparatus, then to the nearer end of the first divided portion and further to the other end of the first AC source; a second AC source, a conductor line connecting one end of the second AC source to the nearer end of the second divided portion of said heat generating apparatus, the second divided portion of said heat-generating apparatus being a pipe, a conductor line connecting the far end of the second divided portion of said heat-generating pipe to the other end of the second AC source, arranged in such order as to flow AC from the one end of the AC source, to the nearer end of the second divided portion of said heat-generating apparatus, then to the far end of the second divided portion of said heat-generating apparatus and further to the other end of the second AC source, a part of the above-mentioned conductor line connecting the one end of the second AC source to the nearer end of the second divided portion of said heat-generating apparatus forming the common conductor line with a part of the above-mentioned conductor line conductor line connecting the one end of the first AC source to the near end of the first divided portion of said heat-generating apparatus and a circuit for detecting difference of the current flowing in the first dividing portion and that of the second divided portion consisting of a first current transformer whose primary side is inserted in the conductor line connecting the first AC source to the first divided portion, a current difference detecting apparatus and a second current transformer whose primary side is inserted in the conductor line connecting the second divided portion to the second AC source so as to flow current from the secondary side of the first transformer to the current difference detecting apparatus and further from the secondary side of the second transformer to the current difference detecting apparatus.
Claim 7
Dependent Claim
63 words
A circuit according to claim 4 wherein both the conductor line connecting one end of the first AC source to the far end of the first divided portion and the conductor line connecting the far end of the second divided portion to the other end of the second AC source are passed through the inside of the respective portions of the heating apparatus.
Claim 8
Dependent Claim
63 words
A circuit according to claim 4 wherein both the conductor line connecting one end of the first AC source to the far end of the first divided portion and the conductor line connecting the far end of the second divided portion to the other end of the second AC source are provided at the outside of the respective portions of the heating apparatus.
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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |