阅读说明：本技术 全光纤电流互感器传感环 (All-fiber sensing ring of current transformer ) 是由 赵新科 孟庆喜 廉丽娟 陈帅兵 刘瑞瑞 陈奕嘉 岳光华 李阳 贺小维 田超群 王 于 2020-12-14 设计创作，主要内容包括：本发明涉及全光纤电流互感器传感环。全光纤电流互感器传感环包括外壳和设置在外壳内的光纤,在外壳内固定有保温层和光纤安装层,光纤安装层对光纤提供支撑固定的作用,保温层对光纤起到保温的作用,当温度快速变化时,使热量缓慢的穿过保温层,在光纤安装层的热交换时间长,使传感光纤各个位置的温度变化慢且接近一致,使温度变化对传感光纤的影响小。解决了在温度骤升骤降的环境下,由于温度变化速度较快,测量结果精度较差的问题。(The invention relates to a sensing ring of an all-fiber current transformer. The sensing ring of the all-fiber current transformer comprises a shell and optical fibers arranged in the shell, wherein a heat insulation layer and an optical fiber installation layer are fixed in the shell, the optical fiber installation layer provides a supporting and fixing effect for the optical fibers, the heat insulation layer plays a heat insulation effect on the optical fibers, when the temperature changes rapidly, heat slowly penetrates through the heat insulation layer, the heat exchange time on the optical fiber installation layer is long, the temperature change of each position of the sensing optical fibers is slow and close to the same, and the influence of the temperature change on the sensing optical fibers is small. The problem of under the environment of sudden temperature rise and drop, because temperature variation speed is very fast, the measuring result precision is relatively poor is solved.)

1. Full optical fiber current transformer sensing ring, including shell and the optic fibre of setting in the shell, its characterized in that, the shell includes:

a housing having a housing cavity;

the heat insulation layer is fixed on the wall of the inner cavity of the shell;

the optical fiber installation layer is arranged on the inner side of the heat preservation layer and is provided with an optical fiber installation groove for fixing an optical fiber;

the difference between the expansion coefficient of the optical fiber installation layer and the expansion coefficient of the optical fiber is smaller than the difference between the expansion coefficient of the thermal insulation layer and the expansion coefficient of the optical fiber.

2. The all-fiber current transformer sensor ring of claim 1, wherein said housing comprises an upper cover and a lower cover, said insulation layer comprises an upper cover insulation layer on said upper cover and a lower cover insulation layer on said lower cover, said upper cover and said lower cover are detachably connected.

3. The all-fiber current transformer sense loop of claim 2, wherein the fiber mounting layer comprises an upper-cover fiber mounting layer on an upper cover and a lower-cover fiber mounting layer on a lower cover.

4. The all-fiber current transformer sensor ring of claim 2, wherein said top cover insulating layer and said bottom cover insulating layer are symmetrically disposed.

5. The all-fiber current transformer sensor ring of claim 2, wherein said top cover and said bottom cover are secured by bolts.

6. The all-fiber current transformer sensor ring according to any one of claims 1-5, wherein said optical fiber is adhesively secured to a fiber mounting layer.

7. The all-fiber current transformer sensor ring of any one of claims 1-5, wherein the thermal conductivity of the insulating layer is less than the thermal conductivity of the fiber mounting layer.

8. The all-fiber current transformer sensor ring of claim 7, wherein said fiber mounting layer is made of teflon or epoxy, and said insulation layer is made of mineral wool or polyurethane material.

9. The all-fiber current transformer sensor ring of any one of claims 1-5, wherein said insulating layer is bonded to said housing, and said fiber mounting layer is bonded to said insulating layer.

10. The all-fiber current transformer sense loop of any of claims 1-5, wherein the optical fibers comprise sensing fibers, polarization maintaining fibers, and temperature measuring fibers.

Technical Field

The invention relates to a sensing ring of an all-fiber current transformer.

Background

The all-fiber current transformer has high precision and good application prospect in GIS equipment. However, the all-fiber current transformer is greatly affected by temperature, and usually the measurement result needs to be compensated according to the temperature, for example, chinese patent with an authorization publication number of CN106324323B discloses an all-fiber current transformer and a current measurement method thereof. However, in an environment with sudden temperature rise and drop, the accuracy of the measurement result is poor due to the fast temperature change speed.

Disclosure of Invention

The invention aims to provide a sensing ring of an all-fiber current transformer, which is used for solving the technical problem of poor measurement result precision of the current transformer.

The sensing ring of the all-fiber current transformer adopts the following technical scheme:

full optical fiber current transformer sensing ring, including shell and the optic fibre of setting in the shell, its characterized in that, the shell includes:

a housing having a housing cavity;

the heat insulation layer is fixed on the wall of the inner cavity of the shell;

the optical fiber installation layer is arranged on the inner side of the heat preservation layer and is provided with an optical fiber installation groove for fixing an optical fiber;

the difference between the expansion coefficient of the optical fiber installation layer and the expansion coefficient of the optical fiber is smaller than the difference between the expansion coefficient of the thermal insulation layer and the expansion coefficient of the optical fiber.

The beneficial effects are that: the optical fiber installation layer provides the fixed effect of support to the optical fiber, and the heat preservation plays heat retaining effect to the optical fiber, when the temperature rapid change, makes the heat slowly pass the heat preservation, and the heat exchange time on the optical fiber installation layer is long, makes the influence of temperature variation to sensing optical fiber little. Let full optical fiber current measuring device can deal with adverse circumstances's influence, full optical fiber current transformer product stability is better, has solved under the environment of abrupt rising and dropping of temperature, because temperature variation is fast, the relatively poor problem of measuring result precision.

Furthermore, the shell comprises an upper cover and a lower cover, the heat-insulating layer comprises an upper cover heat-insulating layer positioned on the upper cover and a lower cover heat-insulating layer positioned on the lower cover, and the upper cover and the lower cover are detachably connected.

The beneficial effects are that: the heat-insulating layer inside the shell and the shell is divided into an upper part and a lower part, so that the installation of the internal optical fiber installation layer and the optical fibers is more convenient.

Further, the optical fiber installation layer comprises an upper cover optical fiber installation layer arranged on the upper cover and a lower cover optical fiber installation layer arranged on the lower cover.

The beneficial effects are that: the optical fiber fixing device has the advantages that the optical fiber arranged in the optical fiber heat insulation layer is supported and fixed, the optical fiber is separated from the upper portion to the lower portion, and the optical fiber is more convenient to install.

Furthermore, the upper cover heat-insulating layer and the lower cover heat-insulating layer are symmetrically arranged.

The beneficial effects are that: the upper and lower insulating layers are symmetrical and have consistent thickness, so that the temperature change of each position of the optical fiber is close to consistent when the temperature changes.

Further, the upper cover and the lower cover are fixed through bolts.

The beneficial effects are that: the upper cover and the lower cover are fixed through bolts, and the cover is convenient to open or install.

Furthermore, the thermal conductivity of the insulating layer is smaller than that of the optical fiber installation layer.

The beneficial effects are that: under the quick condition of temperature variation, insulation material plays the effect that certain temperature slows down to inside optic fibre, and heat preservation coefficient of heat conductivity is littleer, and the temperature conduction is slower, makes the inside temperature variation of heat preservation littleer.

Further, the optical fiber installation layer is made of polytetrafluoroethylene or epoxy resin, and the heat insulation layer is made of mineral wool or polyurethane materials.

The beneficial effects are that: the heat preservation adopts the material that coefficient of heat conduction is minimum, plays the heat preservation effect to inside, and the optic fibre installation layer adopts that the temperature transfer coefficient is moderate or less, and coefficient of expansion is close with sensing optic fibre material, plays certain temperature control's effect down, plays installation and fixed action to optic fibre.

Furthermore, the optical fiber is bonded and fixed on the optical fiber installation layer, the heat insulation layer is bonded and fixed on the shell, and the optical fiber installation layer is bonded on the heat insulation layer.

The beneficial effects are that: and the sensing rings are bonded and fixed with each other, so that the structure of the whole all-fiber current transformer sensing ring is firmer.

Furthermore, the optical fiber comprises a sensing optical fiber, a polarization maintaining optical fiber and a temperature measuring optical fiber.

Drawings

Fig. 1 is a schematic cross-sectional view of an all-fiber current transformer sensing ring in embodiment 1 of the all-fiber current transformer sensing ring according to the present invention;

fig. 2 is a partial cross-sectional view of an all-fiber current transformer sensing ring in accordance with embodiment 1 of the present invention before installation;

FIG. 3 is a graph comparing temperature rise curves of a sensing ring in the prior art and a sensing ring in the present embodiment in an embodiment 1 of an all-fiber current transformer sensing ring according to the present invention;

in the figure: 1. a sensing ring of the all-fiber current transformer; 2. a housing; 21. a housing; 211. an upper cover; 212. a lower cover; 213. bolt holes; 22. a heat-insulating layer; 221. an upper cover heat-insulating layer; 222. a lower cover heat-insulating layer; 23. an optical fiber installation layer; 231. covering an optical fiber installation layer; 232. a lower cover optical fiber installation layer; 233. an optical fiber mounting groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships that are assumed to be orientations or positional relationships, and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

The features and properties of the present invention are described in further detail below with reference to examples.

The invention relates to a sensing ring of an all-fiber current transformer, which comprises the following specific embodiments:

as shown in fig. 1 and 2, an all-fiber current transformer sensing ring 1 includes a housing 2 and an optical fiber disposed within the housing 2. The optical fiber comprises three types of sensing optical fiber, polarization maintaining optical fiber and temperature measuring optical fiber.

As shown in fig. 1, the housing 2 includes a case 21, an insulating layer 22, and an optical fiber installation layer 23 disposed inside the insulating layer.

The housing 21 includes an upper cover 211 and a lower cover 212, the upper cover 211 and the lower cover 212 are detachably connected and symmetrically disposed, and bolt holes 213 are formed between the upper cover 211 and the lower cover 212, and are fixed by bolts.

The heat insulating layer 22 is fixed on the inner cavity wall of the shell 21 in a bonding and fixing mode, the heat insulating layer 22 comprises an upper cover heat insulating layer 221 on the upper cover 211 and a lower cover heat insulating layer 222 on the lower cover 212, and similar to the shell 21, the upper cover heat insulating layer 221 and the lower cover heat insulating layer 222 are symmetrically arranged. The insulating layer 22 is mainly made of an insulating material with a very small thermal conductivity coefficient, and in this embodiment, the material used for the insulating layer 22 is specifically mineral wool.

The optical fiber installation layer 23 is fixed on the inner side of the heat insulation layer 22 in a bonding and fixing mode, the optical fiber installation layer 23 comprises an upper cover optical fiber installation layer 231 on the upper cover 211 and a lower cover optical fiber installation layer 232 on the lower cover 212, an optical fiber installation groove 233 for fixing an optical fiber is formed in the optical fiber installation layer 23, the optical fiber is fixed in the optical fiber installation groove 233 of the optical fiber installation layer 23 in a bonding and fixing mode, and the upper cover optical fiber installation layer 231 and the lower cover optical fiber installation layer 232 of the optical fiber installation layer 23 are symmetrically arranged similarly to the housing 21. The optical fiber installation layer 23 mainly uses a thermal insulation material with a moderate temperature transfer coefficient and an expansion coefficient close to that of the optical fiber, and in this embodiment, the specific material used for the optical fiber installation layer 23 is epoxy resin.

The shell 21, the heat-insulating layer 22 and the optical fiber installation layer 23 are equally divided into an upper part and a lower part which are symmetrical, bolt holes for bolts to pass through are formed in the shell 21, the upper part and the lower part of the shell 21 are fixed together in a bolt fixing mode, the heat-insulating layer 22 is bonded on the wall of an inner cavity of the shell 21, the optical fiber installation layer 23 is bonded on the inner side of the heat-insulating layer 22, and the upper part and the lower part of the heat-insulating layer 22 and the upper part and the lower part of the optical fiber installation layer. The optical fiber is bonded and fixed in the optical fiber mounting groove 233 of the optical fiber mounting layer 23, and each part is bonded and fixed with each other, so that the whole all-fiber current transformer sensing ring 1 has a firmer structure. The optical fiber mounting grooves 233 are three, one of which is provided with polarization maintaining optical fibers and temperature measuring optical fibers, and the other two of which are provided with sensing optical fibers, and when optical fibers need to enter the other optical fiber mounting groove from one optical fiber mounting groove, the groove walls of the two optical fiber mounting grooves are provided with openings.

Insulating layer 22 and optic fibre installation layer 23 are made by insulation material, the coefficient of heat conductivity of insulating layer 22 is less than the coefficient of heat conductivity of optic fibre installation layer 23, the coefficient of heat conductivity of insulating layer 22 is minimum, when the external difference in temperature changes, temperature conduction efficiency is extremely low, make the heat slow spread into in the insulating layer, be difficult to the inside production influence of insulating layer 22, the coefficient of heat conductivity of optic fibre installation layer 23 is moderate, thermal conduction is long at the heat exchange time of optic fibre installation layer 23, the temperature variation that makes each position on the optic fibre is close unanimous. The heat-insulating layer 22 and the optical fiber installation layer 23 enable the overall temperature rise process time of the optical fibers in the heat-insulating layer to be long, the temperature change of the sensing optical fibers to be slow, and the influence on the temperature measured by the temperature measuring optical fibers to be small.

The difference of the expansion coefficient of the optical fiber installation layer 23 and the expansion coefficient of the optical fiber is smaller than the difference of the expansion coefficient of the thermal insulation layer 22 and the expansion coefficient of the optical fiber, the expansion coefficient of the optical fiber installation layer 23 is close to the optical fiber, when the temperature changes, the difference of the deformation of the optical fiber installation layer 23 and the deformation of the optical fiber is not much, certain supporting and fixing effects are mainly achieved on the optical fiber, the thermal insulation layer 22 is prevented from being greatly influenced by the temperature, the optical fiber is prevented from being pulled, and the service life of the all-fiber current transformer sensing ring 1 is shortened.

In use, the upper and lower portions of the housing 21, the insulating layer 22 and the optical fiber installation layer 23 are respectively bonded, the optical fiber is bonded in the optical fiber installation groove 233 of the lower cover optical fiber installation layer 232 of the optical fiber installation layer 23, the upper layer of the optical fiber is coated with an adhesive, the entire upper portion of the housing 2 is installed on the lower portion, and the upper and lower portions are fixedly connected by bolts.

As shown in fig. 3, the temperature change curve of the optical fiber in the sensing ring in the prior art and the temperature change curve of the optical fiber in the sensing ring in this embodiment are tested in a rapid temperature change process of the high and low temperature test chamber under the same temperature rise condition, and the temperature rises at a speed of about 2 ℃/min. It can be found that the speed of the temperature change of the optical fiber in the sensing ring in the prior art is not balanced, and the influence on the error is large; the whole temperature rise process of the optical fiber in the sensing ring in the embodiment is long, the temperature change of the sensing optical fiber is slow, and the influence on the sensing optical fiber is small. Under the effect of heat preservation layer 22 and optic fibre installation layer 23, can effectual control when temperature variation is big, the temperature of the inside optic fibre of full optical fiber current transformer sensing ring 1 slowly rises slowly and falls, guarantees full optical fiber current transformer sensing ring 1's long-term operation and reliability.

The invention relates to a specific embodiment 2 of a sensing ring of an all-fiber current transformer, which comprises the following components:

the difference from the all-fiber current transformer sensing ring in embodiment 1 is that the upper cover and the lower cover of the housing are connected by means of a snap. In other embodiments, the fixing connection may be performed by means of bonding, rivet connection, or the like.

Embodiment 3 of the sensing ring of the all-fiber current transformer of the present invention:

the sensing ring of the all-fiber current transformer in the embodiment 1 is different only in that the heat insulating layer can be made of polyurethane material. In other embodiments, the fiber mounting layer may be made of a polytetrafluoroethylene material. In other embodiments, the insulating layer is made of polyurethane material and the optical fiber mounting layer is made of polytetrafluoroethylene material.

Embodiment 4 of the sensing ring of all-fiber current transformer of the present invention:

the difference between the sensing ring and the all-fiber current transformer sensing ring in the embodiment 1 is that the optical fiber is encapsulated in the optical fiber installation groove through glue filling.

Embodiment 5 of the sensing ring of the all-fiber current transformer of the present invention:

the difference from the all-fiber current transformer sensing ring in embodiment 1 is only that the upper cover of the housing in this embodiment is a flat cover. In other embodiments, the upper cover may be a half-type structure.

Embodiment 6 of the sensing ring of the all-fiber current transformer of the present invention:

the difference between the sensing ring and the all-fiber current transformer in embodiment 1 is that the thermal conductivity of the insulating layer is consistent with that of the optical fiber installation layer. In other embodiments, the thermal conductivity of the insulating layer may be greater than the thermal conductivity of the fiber mounting layer.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.