CN1267833A - Assembly-less stress sensor head for magneto-optical current transformer - Google Patents
Assembly-less stress sensor head for magneto-optical current transformer Download PDFInfo
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- CN1267833A CN1267833A CN 00105939 CN00105939A CN1267833A CN 1267833 A CN1267833 A CN 1267833A CN 00105939 CN00105939 CN 00105939 CN 00105939 A CN00105939 A CN 00105939A CN 1267833 A CN1267833 A CN 1267833A
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- current transformer
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- 239000011521 glass Substances 0.000 claims abstract description 29
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 22
- 239000004020 conductor Substances 0.000 claims abstract description 14
- 230000007704 transition Effects 0.000 claims abstract description 13
- 238000009413 insulation Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 2
- 230000003139 buffering effect Effects 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 abstract 1
- 239000005304 optical glass Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- 238000013461 design Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000002277 temperature effect Effects 0.000 description 2
- 102100040014 GH3 domain-containing protein Human genes 0.000 description 1
- 101000886770 Homo sapiens GH3 domain-containing protein Proteins 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000005355 lead glass Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000011540 sensing material Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The stress sensor head consists of a casing, a glass sensor head and current conductor. The current conductor is placed inside an aluminum alloy cylinder with an insulating layer in between, the aluminum alloy cylinder is placed inside the hole in the center of the glass sensor head with heat insulating material in between, the glass sensor head is placed inside a sealed casing with transition medium in between, and the transition medium is positioned on the casing via an aluminium alloy plate and a buffering layer. The present invention can reduce the effect of temperature and double refraction to the lumpy magneto-optical glass current transformer so as to raise the accuracy and stability of the magneto-optical current transformer.
Description
The present invention relates to a kind of assembly-less stress sensor head that is used for magneto-optical current transformer, belong to electric system metrology and measurement new technical field.This patent of invention can be used for realizing based on Faraday effect, the magneto-optical current transformer that is combined by optical device.Simultaneously, it also can be used for photoelectricity voltage mutual inductor and other devices that is combined to form by block optical device.
The insulation system of induction current transformer is very complicated, cost also can sharply increase with the raising of electric pressure.In addition and since induction current transformer intrinsic magnetic saturation, ferroresonance, dynamic range little, frequency band is narrow and the inflammable and explosive shortcoming such as fried of oil is arranged, it has been difficult to satisfy the needs that modern power systems further develops.Seeking better New type of current mutual inductor has been imperative; Therefore, people focus on the optical sensing technology to notice, develop so-called photo-electric current transformer with optoelectronic method.In the photo-electric current transformer, one type that employing is the widest at present, result of use is best is magneto-optical current transformer.
The birefringence problem that temperature causes is the research difficult point and the emphasis of magneto-optical current transformer, and each seminar has all carried out many researchs to this in the world, but does not still have thorough head it off.It is sensing head that the temperature of solution magneto-optical current transformer and birefringence influence its key of problem, and its performance directly has influence on the success or not of magneto-optical current transformer.For the magneto-optical current transformer sensing head that constitutes by the magneto-optic glass piece, because the structure more complicated of magneto-optic glass sensing head, still do not have maturation method at present, can be used for eliminating the birefringence influence that temperature causes in the block glass magneto-optic formula of the closed loop current transformer.
Eliminate the caused birefringence influence of temperature, relatively effective method is the scheme that adopts the double light path output of Wo Lasi prism, utilize and have characteristic direction (linearly polarized light is parallel to characteristic direction retention wire polarization still when the media) in the linear birefrigence media, calculate the birefringence influence coefficient, measurement result is revised, to eliminate temperature effect.But the method is not applied in the actual device, and the method requirement exists on the basis of characteristic direction in determining the linear birefrigence media, determines the birefringence influence coefficient.In fact, because the characteristic direction of the birefringence media that temperature variation causes is uncertain, thereby said method is not obtained practical application.In addition, also same block of magneto-optic glass can be cut in half, recombinant can reduce the birefringent influence that temperature causes together like this behind the half-twist
[4]But the method is all had higher requirement to processing, the assembling of sensing head, is difficult to accomplish practicability.
The objective of the invention is to propose a kind of assembly-less stress sensor head that is used for magneto-optical current transformer, it can reduce temperature and the birefringence influence to the block glass magneto-optic formula of closed loop current transformer, thereby improves the precision and the stability of magneto-optical current transformer.
The assembly-less stress sensor head that is used for magneto-optical current transformer of the present invention's design is made up of shell, glass blocks sensing head and through-flow conductor.Through-flow conductor places in the aluminum alloy drum, be separated with insulation course between the two, aluminum alloy drum places in the circular hole at glass blocks sensing head center, be provided with heat-barrier material between the two, the glass blocks sensing head places in the can, be provided with transition medium between sensing head and the shell, transition medium is by location aluminium alloy plate and location cushion and shell relative positioning.
The assembly-less stress sensor head that is used for magneto-optical current transformer of the present invention's design, by sensing material being carried out samming and reducing it with extraneous rate of heat exchange, avoid producing excessive thermograde, thus the transient state birefringence that stress birefrin that the assemble method elimination assembling of employing assembly-less stress sensor head causes and temperature produce.Therefore, the measuring error of the magneto-optical current transformer of realizing with the present invention can not exceed the degree of accuracy scope of 0.5 grade of current transformer defined.
Description of drawings:
Fig. 1 is an assembly-less stress sensor head package assembly synoptic diagram.
Fig. 2 is the geometry of block glass sensing head.
Among Fig. 1 and Fig. 2, the 1st, glass blocks sensing head, the 2nd, housing main body, the 3rd, location aluminium alloy plate, the 4th, transition medium, the 5th, location aluminium alloy plate, the 6th, transition medium, the 7th, insulation course, the 8th, through-flow conductor, the 9th, retainer spring, the 10th, side dog screw, the 11st, location cushion, the 12nd, fixed orifice, the 13rd, sensing head plane of light incidence, the 14th, optical fiber, the 15th, incident lens fixed mount, the 16th, the polarizer, the 17th, glass sensing head bottom surface reference field, the 18th, polarizer fixed mount, the 19th, analyzer, the 20th, sensing head beam projecting face, the 21st, gusset, the 22nd, soft heat-barrier material, the 23rd, aluminum alloy drum.
As shown in Figure 1, the assembly-less stress sensor head that is used for magneto-optical current transformer of the present invention's design is made up of shell 2, glass blocks sensing head 1 and through-flow conductor 8.Through-flow conductor 8 places in the aluminum alloy drum 23, be separated with insulation course 7 between the two, aluminum alloy drum 23 places in the circular hole at glass blocks sensing head 1 center, be provided with heat-barrier material between the two, glass blocks sensing head 1 places in the can 2, be provided with transition medium 6 between sensing head and the shell, transition medium 6 is by location aluminium alloy plate 5 and location cushion and shell relative positioning.
Below in conjunction with accompanying drawing, introduce content of the present invention in detail:
The serviceability of magneto-optical current transformer depends primarily on sensing head structural design and assemble method thereof.The present invention has designed sensing head assembly-less stress structure on closed loop magneto-optical current transformer glass sensing head geometric phase compensation method basis.
Fig. 1 shows assembly-less stress sensor head package assembly synoptic diagram, during the actual assembled sensing head, shell 2 and sensing head input face 13 with sensing head, sensing head output face 20, the face that sensing head bottom surface 17 joins is as reference field, sensing head 1, transition medium 4,6 and shell 2 threes of sensing head between do not paste, allow other parts of sensing head to keep movable relatively with the shell of sensing head, the stress that causes because of the expanded size difference when guaranteeing their temperature variation is minimum, but must guarantee the input face of sensing head, output face and bottom surface are invariable with the relative position of reference field; The polarizer 16, analyzer 19, the fixing of input and output lens 15 are all pasted fixing with above-mentioned reference field as a reference, but their bearing must adopt and sensing head shell identical materials, can not adopt screw fastening, to reduce the deformation that reference field is caused by external force.
Transition medium ZF6 seals block glass sensing head around sensing head, power with suitable size is effectively located from three directions perpendicular to reference field glass sensing head, transition medium and aluminum alloy casing, concerning the glass sensing head, these power should evenly distribute, and its stress birefrin influence is enough little.Effectively locate of retainer spring 9 and dog screw 10 generations of required power in these three directions by the particular design on the shell; For the power that retainer spring 9 and dog screw 10 are produced evenly distributes on sensing head, the spy has set up three location aluminium alloy plates 3,5; Dog screw is to location aluminium alloy plate Primary Location, and simultaneously retainer spring played the role of positioning; Be provided with location cushion 11 between location aluminium alloy plate and the dog screw, open the destruction that shrinkage produces to avoid heat.Because the said fixing method, need not paste and the measure of trip bolt, allow other parts of sensing head to be free to slide with respect to three reference fields.
Among the figure, between current 8 and glass sensing head 1, at first put insulation course 7 and make conductor and miscellaneous part insulation, insulation course 7 overcoat aluminum alloy drums 23 then, in order to fixed conductor and shell, and the heating of conductor had a buffer action, aluminum alloy drum 23 outside, in the glass sensing head 1, overlap the heat-barrier material 22 of one deck softness at last in order to the temperature effect of insulated conductor to the glass sensing head.Wherein, gusset 21 is used for strengthening the intensity of housing main body 1, and fixed orifice 2 is used for fixing sensing head.
The sensing head enclosure designs should also be noted that the rigidity that keeps reference field except above-mentioned consideration, to reduce because of whole sensing head deadweight or suffered power produces fixedly the time later on deformation.On enclosure designs, increase by two gussets 21.The aluminium alloy bearing of lens and polarizer directly pastes on the bottom surface reference field 17 with epoxy resin.
Fig. 2 is the geometry figure of block glass sensing head.This structure is commonly referred to as monoblock geometric phase compensation magneto-optical current transformer sensing head structure, and the problem that it mainly solves is how to make light also can keep its linear polarization characteristic around through-flow one week of conductor.Because along rectilinear propagation, sensing head must make light ray propagation direction wherein change to light in some way in identical media, method commonly used is to use total reflection.When linearly polarized light on two kinds of different interfaces total reflection takes place, to produce phase differential between parallel two mutual vertical electric vector components with perpendicular to the plane of incidence, make linearly polarized light become elliptically polarized light, thereby influenced measuring accuracy.The geometric phase penalty method is eliminated the influence of phase differential more cleverly: when allowing the linearly polarized light direction of propagation change 90 ° of angles, make between orthogonal two components the big or small identical of after through twice total reflection phase shift, and total phase differential to offset just be zero.
Consider the complexity of actual processing among the figure, taking reflection angle is 45 °, this moment block glass sensing head geometry as shown in Figure 2, material attach most importance to lead glass ZF6 or ZF7 select primes for use.Four reflecting surface LPNM, PQKI, NRDE, GHDC and incident surface A BCO and reflecting surface IJFO processing request height require to reach smooth finish 12, and the angle of each reflecting surface requires also very high, and error is not more than ± and 0.01 °.This sensing head is to the linearly polarized light of any polarization direction perpendicular to plane of incidence incident, and through six total reflections and around lead after one week, output light still is linearly polarized light.
Claims (1)
1, a kind of assembly-less stress sensor head that is used for magneto-optical current transformer, it is characterized in that, this sensing head is made up of shell, glass sensing head and through-flow conductor, described through-flow conductor places in the aluminum alloy drum, be separated with insulation course between the two, aluminum alloy drum places in the circular hole at glass sensing head center, be provided with heat-barrier material between the two, the glass sensing head places in the can, be provided with transition medium between sensing head and the shell, transition medium is by location aluminium alloy plate and location cushion and shell relative positioning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00105939 CN1267833A (en) | 2000-04-21 | 2000-04-21 | Assembly-less stress sensor head for magneto-optical current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00105939 CN1267833A (en) | 2000-04-21 | 2000-04-21 | Assembly-less stress sensor head for magneto-optical current transformer |
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| Publication Number | Publication Date |
|---|---|
| CN1267833A true CN1267833A (en) | 2000-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00105939 Pending CN1267833A (en) | 2000-04-21 | 2000-04-21 | Assembly-less stress sensor head for magneto-optical current transformer |
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| Country | Link |
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| CN (1) | CN1267833A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101231308B (en) * | 2001-03-30 | 2011-08-24 | 奥马萨瓦尔集团股份有限公司 | High-voltage insulated modular connection system with current and voltage detector |
-
2000
- 2000-04-21 CN CN 00105939 patent/CN1267833A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101231308B (en) * | 2001-03-30 | 2011-08-24 | 奥马萨瓦尔集团股份有限公司 | High-voltage insulated modular connection system with current and voltage detector |
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