Patent US2254779A successfully refreshed from Google Patents.
EP0036760A2
Expired / Lapsed
EP
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Vacuum circuit interrupter system
Assignee: Meidensha Corp
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Filing: 1981-03-19
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Granted: —
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Expires: 2001-03-19
Abstract
Abstract The invention discloses a monitoring device for monitoring degree of vacuum of an electrical device employing an evacuated envelope. The invention provide, particularly, a pressure responsive monitoring device which comprises an electric field generating device of vacuum type, an electric field detecting means including a light source for generating light, an electric field detecting member detecting change of the electric field of the electric field generating member due to the change of degree of vacuum inside the envelope and controlling the light depending upon the change of the electric field, and photoelectric converting member for converting the controlled light by means of the electric field detecting member to an electric signal which is employed to monitor the degree of the envelope of the type.
Inventors
- 👤 Tomio Fukushima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 20:11
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/668
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
107 words
A pressure responsive monitoring device for vacuum circuit interrupters comprising an electric field generating member for generating electric field and including a vacuum circuit interrupter of the type which includes an evacuated envelope, and an electric detecting circuit loop which includes a light source for generating light, an electric field detecting member for detecting 'change of electric field in said electric field generating member depending upon the change of vacuum of said envelope of the vacuum circuit interrupter and controlling incidented light from said light source,- and a photoelectric converting member for converting an output light signal from said electric field generating member to an electric signal.
Claim 2
Dependent Claim
107 words
A pressure responsive monitoring device for vacuum circuit interrupters comprising an electric field generating member for generating electric field and including a vacuum circuit interrupter of the type which includes an evacuated envelope, and an electric detecting circuit loop which includes a light source for generating light, an electric field detecting member for detecting 'change of electric field in said electric field generating member depending upon the change of vacuum of said envelope of the vacuum circuit interrupter and controlling incidented light from said light source,- and a photoelectric converting member for converting an output light signal from said electric field generating member to an electric signal.
Claim 3
Dependent Claim
45 words
A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 1, further comprising a vacuum strength discriminating member for discriminating degree of vacuum of said envelope of the vacuum circuit interrupter in response to the electric signal of said photoelectric converting member.
Claim 4
Dependent Claim
56 words
A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 1 or 2 wherein said electric field detecting member comprising, at least, a polarizing element for polarizing the light -incidented from said light source, and an electric field detecting element for changing an angle of polarization of polarized light by said polarizing element.
Claim 5
Dependent Claim
37 words
A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 3 wherein said electric field detecting member further comprizing an analyzing element for analyzing an output light incidented from the electric field detecting element.
Claim 6
Dependent Claim
66 words
5 . A pressure responsive monitoring device for vacuum circuit interrupter as claimed in claim 1 wherein said electric field detecting element of the electric field detecting member is provided spaced apart at a predetermined distance from a part of said envelope of the vacuum circuit interrupter in which the deviation of electric field in response to change of the degree of vacuum inside the envelope.
Claim 7
Dependent Claim
67 words
A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 5 wherein said vacuum circuit interrupter of the electric field generating member further comprising a pair of separable contacts with in said envelope adapted to be connected in series with the circuit, a metal shield surrounding the contacts and shielding the envelope against metal deposits, and a tublar flange for supporting said metal shield.
Claim 8
Dependent Claim
33 words
-7. A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 6 wherein an electric field detecting member is provided spaced apart at a predetermined distance from said tublar flange.
Claim 9
Dependent Claim
44 words
A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 3 wherein said electric field detecting member comprises a polarizer connected to the power source by an optical fiber, and a pockel's cell provided in. the output side of said polarizer.
Claim 10
Dependent Claim
28 words
A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 8 wherein said electric field detecting member further includes an analyzing element comprising an analyzer.
Claim 11
Dependent Claim
28 words
A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 9 further comprizing a photoelectric converting member connected to said analyzer by an optical fiber.
Claim 12
Dependent Claim
38 words
ll. A pressure responsive monitoring device as claimed in claim 1 wherein said vacuum circuit interrupters of the electric field generating member has a plurarity of series connected vacuum interrupting units in one phase of power supply line.
Claim 13
Dependent Claim
110 words
'12. A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 11 comprising an electric field detecting circuit loop which includes a light source for generating light, a first electric field detecting member connected to said light source by a first optical fiber and provided in the first vacuum interrupting unit, a second electric field detecting member connected to said first electric field detecting member by a second optical fiber and provided in the second vacuum interrupting unit, a photoelectric converting member connected to said second field detecting member by a third optical fiber, and a vacuum strength discriminating member electrically connected to said photoelectric converting member.
Claim 14
Dependent Claim
97 words
A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim in claim 12 wherein said first electric field detecting member comprises a first polarizer connected to the light source, a first pockel's cell provided in an output side of said first polarizer, and a second polarizer provided an output side of said first pockel's cell, and wherein said second electric field detecting member comprises a second pockel's cell connected to said second polarizer of the second electric field detecting member, and a third polarizer provided in an output side of said second pockel's cell.
Claim 15
Dependent Claim
61 words
' 14. A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 12 wherein each of said first and second electric field detecting members comprises a first polarizer connected to the light source, a pockel's cell provided in the output.side of said first analyzer, and a second polarizer provided in an optical output side of said pockel's cell.
Claim 16
Dependent Claim
98 words
A pressure responsive monitoring device for circuit interrupters as claimed in claim 12 wherein said first electric field detecting member comprises a first polarizer connected to the light source, a first pockel's cell provided in an optical output side of said polarizer, and a second polarizer provided in an optical outjput side of said- first pockel's cell, and wherein said second electric field detecting member comprises a second pockel's cell optically connected to said second polarizer of the first electric field detecting member, and a second polarizer provided in an optical output side of said second pockel's cell.
Claim 17
Dependent Claim
85 words
A pressure responsive monitoring device for vacuum circuit interrupters as claimed in calim 12 wherein said first electric field detecting member comprises a first polarizer connected to the power'source, and a first pockel's cell provided in an optical output side of said first polarizer, and wherein said second electric field ' detecting member comprises a second polarizer optically connected to said first polarizer of the first electric field detecting member, and a second polarizer provided in an optical output side of said second pockel's cell.
Claim 18
Dependent Claim
67 words
A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 11 wherein said envelope of the vacuum interrupting unit is quipped with voltage dividing means including a plurarity of voltage dividing capacitors for dividing applied voltage to said envelope, and wherein said electric field detecting member includes an electric field detecting element electrically connected to said at least one of .said voltage dividing capacitors.
Claim 19
Dependent Claim
46 words
A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 1 wherein said vacuum circuit interrupter has three phase vacuum interrupting unit, and wherein said electric field detecting circuit loop includes electric field detecting elements which are provided in said vacuum interrupting units.
Claim 20
Dependent Claim
56 words
A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 18 wherein each of said vacuum circuit interrupters has series connected two interrrupting unit in one phase of power ' line, and each of said vacuum interrupting units is equipped with an electric field detecting member of the electric field detecting circuit loop.
Claim 21
Dependent Claim
131 words
A pressure responsive monitoring device for vacuum circuit interrupters as claimed in claim 19 wherein said electric field detecting circuit loop comprising a light source, series connected plurarity of electric field detecting members provided in said each of vacuum interrupting units, a photoelectric converting member for converting an optical signal supplied from said electric field detecting members, and a vacuum strength discriminating member electrically connected to said photoelectric converting member, one of said electric field detecting members which is connected to said light source comprises an electric field detecting member consisting of a polarizer optically connected to said light source and pockel's cell, and an electric field detecting member consisting of a pockel's cell connected to an adjacent electric field detecting member, and a polarizer connected to said photoelectric converting member.
References Cited (Backward Citations)
No citation records indexed.
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