CN2329003Y - 110 KV passive optical fibre current mutual inductor - Google Patents
110 KV passive optical fibre current mutual inductor Download PDFInfo
- Publication number
- CN2329003Y CN2329003Y CN 98235720 CN98235720U CN2329003Y CN 2329003 Y CN2329003 Y CN 2329003Y CN 98235720 CN98235720 CN 98235720 CN 98235720 U CN98235720 U CN 98235720U CN 2329003 Y CN2329003 Y CN 2329003Y
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- sensing head
- metal cap
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Abstract
The utility model relates to an 110KV passive optical fiber current mutual inductor, composed of an insulation structure and a whole glass type optical current inducting head with a three-dimensional structure. The periphery of a main body glass ring of the inducting head is provided with five reflecting surfaces with angles of 45 DEG and a vertical emitting light transmission surface, and the front, the back, the right, the left, the top and the bottom surfaces are opposed. The inducting head is fixed on an insulating support and covered with a metal cap. A bus copper bar contacts with an eye hole of the metal cap. Optical fiber passes through a small hole of an epoxy bamboo joint tube and is arranged in a very bending form for increasing a surface creepage distance. The optical current mutual inductor can greatly improve the closing extent of an optical beam rounding a current loop. The utility model has the advantages of strong anti-interference ability, few optical cemented surfaces, low optical transmission loss, high reliability and wide range of application.
Description
What the utility model was related is a kind of passive type optical fiber current mutual inductor, includes the insulation system of three-dimensional structure monolithic glass type optical current sensing head summation current transformer.Applicable to the measurement of various electric currents (as power network current, the big electric current of transient state, dash current etc.), be particularly useful for measuring the current signal that conventional electrical instrument is inapplicable or be difficult to accurate measurement.Can be applicable to the various current measurements under electric system high pressure, the UHV (ultra-high voltage).
In the prior art, utilize the block magneto-optic memory technique type optical current sensor of faraday (Faraday) magneto-optic effect, can design how much topological structures different with being processed into many kinds.Major requirement to these structures: have good guarantor's bias energy; Light path forms closed circuit around tested electric current; The loss of light is little; Reliable and stable etc.Usually make linearly polarized light in the glass sensing head, realize that through total reflection several times light path forms closure or approximate closed loop around tested electric current, and adopt critical total reflection method or Orthogonal Double total reflection method to solve and protect inclined to one side problem.Utilize the Orthogonal Double total reflection method to realize protecting inclined to one side sensing head design proposal and be suggested in the prior art, its sensing head is generally the strip structure that formed by four long prisms gummeds or digs up an angle and glue together a fritter prism and make block type structure into, outgoing transition going into outgoing beam intersection.Existing strip structure and block type structure sensing head, incident light and emergent light are all propagated in the light path of the upper and lower of sensing head respectively, light path is not closed fully, makes measurement be subjected to the influence of conductor position and external magnetic field easily, has reduced the accuracy of current measurement.In addition, in existing strip structure, light beam passes through cemented surface three times, and in existing block type structure, light beam passes through cemented surface twice, and this makes the loss of light increase, and cemented surface is many, has reduced the reliability of sensing head.
The insulation of the employing tradition electromagnetic current transducer that the insulation system of passive type optical fiber current mutual inductor of the prior art has is supported, and need fill sulfur hexafluoride (SF
6) gas or oil-filled; The employing that has is irritated epoxy glue formula compound inslation entirely and is supported.Usually exist complex structure, shelf depreciation arranged, technology difficulty reaches shortcomings such as cost height greatly.
The purpose of this utility model is at weak point of the prior art, designing a kind of three-dimensional structure piece type optical current sensor head construction that utilizes becomes, has the good insulation performance, the passive type optical fiber current mutual inductor that simple in structure, anti-outside electromagnetic interference is strong, technology is simple, with low cost.
110 kilovolts of passive type optical fiber current mutual inductors described in the utility model are made of current sensing head and insulation system.
Current sensing head is a three-dimensional structure monolithic glass type optical current sensing head, is made of little prism 1 in right angle and main body glass ring 2.Little prism 1 is arranged on that incident light enters the sensing head place on the big reflecting surface 8 in glass ring 2 fronts.Have circular hole 3 in the middle of the main body glass ring 2, its peripheral four sides have 4,6,7,8,9 and vertical outgoing of 5 relative 45 reflectings surface of top to bottom, left and right, front and rear to lead to light face 5.
Described current transformer insulation system is, between lower flange 10 and upper flange plate 11, be provided with bamboo joint type epoxy cylinder string 12, bamboo joint type epoxy cylinder string 12 is made of several ring formula epoxy cylinders 13, bamboo joint type epoxy cylinder string 12 outer hard-pressed bale epoxy glass fabrics 14, turn to epoxy cylinder, constitute insulation and support, the compound inslation shirt rim 15 that the external insulation that supports in insulation has silicon rubber to make; Epoxy bamboo tube 13 is provided with aperture 16, and optical fiber 17 passes from the aperture 16 of epoxy bamboo tube 13, and optical fiber 17 is crooked as far as possible to increase the creepage distance of optical fiber surface, and optical fiber 17 seals with epoxy glue with ring aperture 16 contact positions;
Said optical sensing head is fixed on the upper flange plate 11 of insulation support, and the outside is covered with ∩ type metal cap 18; Metal cap 18 is provided with earhole 19,19 ', and the copper rod 20 of conduction high voltage bus electric current passes one side earhole 19 of metal cap 18, passes the circular hole 3 in the middle of the sensing head main body glass ring 2 again, passes from another earhole 19 ' of metal cap 18; One end of copper rod 20 contacts with an earhole 19 of metal cap 18, another earhole 19 ' insulation 21 of the other end and metal cap 18.Like this, the high voltage bus electric current was flow through from copper rod, and make copper rod, metal cap, upper flange plate be in equipotential again, not only can protect sensing head, again the maskable outside electromagnetic interference.The earhole 19,19 ' of metal cap 18, and upper flange plate 11 adopts strict seal approach.
The said current transformer of the utility model has the effect of following advantage.
1, propagates in lower floor's light path because emergent light and incident light coexist, thereby improved the closed degree of light path greatly.
2, light beam only once by cemented surface, under the condition of processing technology maturation, this structure can be without gummed, and directly makes with a whole block material, obviously this will not only reduce the loss of sensing head, more make the reliability of sensing head improve greatly.
3, optics processing and coupling technique are simple.
4, the effect of optical current sensing head is compared with the effect of prior art, and the not closed degree of the light path of sensing head reduces significantly.Be all 98 * 98 * 33mm with physical dimension
3Sensing head be example, existing block type structure, the not closed degree of its light path accounts for 5% of total optical path length, the not closed degree of light path of the present utility model only is 0.9%, thereby can think closed light path basically.
5, the passive type optical fiber current mutual inductor of applicable all kinds of insulation system (full fiber type, glass mould and mixed type etc.) and purposes (electric current metering, protection, leakage current measurement, impact current for measuring etc.).
6, insulation system has safe and reliable, good insulation preformance; Optical fiber is easy to settle; Simple in structure, firm, sensing head there are certain Shockproof heat insulation effect, sealed damp-proof; Anti-outside electromagnetic interference; With function such as high voltage bus is easy to connect.
Fig. 1: three-dimensional structure monolith-type optical current sensing head synoptic diagram;
Fig. 2: optical current sensing head master looks synoptic diagram;
The A of Fig. 3: Fig. 2 is to view;
Fig. 4: current transformer insulation system synoptic diagram;
Fig. 5: the syntagmatic synoptic diagram of the sensing head of current transformer, metal cap and copper rod.
In the said optical current sensing head of the utility model, said main body glass ring 2 is to be processed into the Orthogonal Double total reflection through optics to protect bias tyre sensing head main body on a monoblock optical glass, be the square bulk, in ask and have circular hole 3 that its peripheral four sides have 4,6,7,8,9 and vertical outgoing of 5 relative 45 reflectings surface of top to bottom, left and right, front and rear to lead to light face 5.
Said little prism 1 can be bonded in that incident light enters the sensing head place on the big reflecting surface 8 in glass ring 2 fronts; Also little prism 1 can be made with the same vitreum of glass ring 2 usefulness.
The principle of work of said three-dimensional structure monolithic glass type optical current sensing head as shown in Figure 1, the linearly polarized light of input is propagated at lower floor's light path along continuous straight runs after the little right-angle prism 1 of incident enters sensing head main body glass ring, change the direction of propagation at place, a angle through reflecting surface 9 reflections and vertically propagate, enter along continuous straight runs propagation again in the light path of upper strata through reflecting surface 4 reflections then.After b angle place changes optical path direction twice through reflecting surface 6,9, reach place, c angle reflecting surface 8,7 secondary reflection again, at place, c angle emergent light is entered in lower floor's light path at last and propagate, and through perpendicular end surface 5 outgoing.
Dotted portion is represented the direction of propagation of light beam in sensing head among Fig. 1.
Claims (4)
1, a kind of 110 kilovolts of passive type optical fiber current mutual inductors are made of current sensing head and insulation system, it is characterized in that:
Said sensing head is made of a little right-angle prism (1) and main body glass ring (2); Said main body glass ring (2) is to be processed into the Orthogonal Double total reflection through optics to protect bias tyre sensing head main body on a monoblock optical glass, be the square bulk, the centre has circular hole (3), its peripheral four sides have relative 5 the 45 reflectings surface (4) in top to bottom, left and right, front and rear, (6), (7), (8), (9) and the logical light face (5) of vertical outgoing; Said little prism (1) is arranged on the last incident light of the positive big reflecting surface (8) of glass ring (2) and enters the sensing head place;
Described insulation system is: be provided with bamboo joint type epoxy cylinder string (12) between lower flange (10) and upper flange plate (11), bamboo joint type epoxy cylinder string (12) is made of several ring formula epoxy cylinders (13), the outer hard-pressed bale epoxy glass fabric of bamboo joint type epoxy cylinder string (12) (14), turn to epoxy cylinder, constitute insulation and support, the compound inslation shirt rim (15) that the external insulation that supports in insulation has silicon rubber to make; Epoxy bamboo tube (13) is provided with aperture (16), optical fiber (17) passes from the aperture (16) of epoxy bamboo tube (13), optical fiber (17) is crooked as far as possible to increase the creepage distance of optical fiber surface, and optical fiber (17) seals with epoxy glue with ring aperture (16) contact position;
Said optical sensing head is fixed on the upper flange plate (11) of insulation support, and the outside is covered with ∩ type metal cap (18); Metal cap (18) is provided with earhole (19), (19 '), the copper rod (20) of conduction high voltage bus electric current passes one side earhole (19) of metal cap (18), pass the circular hole (3) in the middle of the sensing head main body glass ring (2) again, pass from another earhole (19 ') of metal cap (18); One end of copper rod (20) contacts with an earhole (19) of metal cap (18), another earhole (19 ') insulation (21) of the other end and metal cap (18).
According to the said current transformer of claim 1, it is characterized in that 2, said little prism (1) can be bonded in the last incident light of the positive big reflecting surface (8) of glass ring (2) and enter the sensing head place.
According to the said current transformer of claim 1, it is characterized in that 3, said little prism (1) can be made for same vitreum altogether with glass ring (2).
4, according to the said current transformer of claim 1, it is characterized in that, the earhole 19,19 ' of said metal cap 18, and upper flange plate 11 adopts strict seal approach.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98235720 CN2329003Y (en) | 1998-05-09 | 1998-05-09 | 110 KV passive optical fibre current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98235720 CN2329003Y (en) | 1998-05-09 | 1998-05-09 | 110 KV passive optical fibre current mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2329003Y true CN2329003Y (en) | 1999-07-14 |
Family
ID=33983936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98235720 Expired - Fee Related CN2329003Y (en) | 1998-05-09 | 1998-05-09 | 110 KV passive optical fibre current mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2329003Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698572A (en) * | 2013-12-26 | 2014-04-02 | 山东彼岸电力科技有限公司 | All-fiber photoelectric current transformer |
| CN112771389A (en) * | 2018-09-26 | 2021-05-07 | 西门子能源全球有限公司 | Monolithic glass ring and method for optical current measurement |
| CN113466600A (en) * | 2021-08-03 | 2021-10-01 | 国网四川省电力公司营销服务中心 | Circuit, method and use for detecting the effect of leakage current on a current transformer |
-
1998
- 1998-05-09 CN CN 98235720 patent/CN2329003Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698572A (en) * | 2013-12-26 | 2014-04-02 | 山东彼岸电力科技有限公司 | All-fiber photoelectric current transformer |
| CN112771389A (en) * | 2018-09-26 | 2021-05-07 | 西门子能源全球有限公司 | Monolithic glass ring and method for optical current measurement |
| CN113466600A (en) * | 2021-08-03 | 2021-10-01 | 国网四川省电力公司营销服务中心 | Circuit, method and use for detecting the effect of leakage current on a current transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |