阅读说明：本技术 一种测温光纤转接模块和带测温光纤转接模块的变压器 (Temperature measurement optic fibre switching module and take temperature measurement optic fibre switching module's transformer ) 是由 张文松 王攀 于 2020-11-29 设计创作，主要内容包括：本发明提供一种测温光纤转接模块和带测温光纤转接模块的变压器,解决现有油浸式变压器用光纤结构存在密封性差、无法重复插拔使用、耦合效率低的问题。转接模块包括贯通法兰、耦合接头、两个防水接头和转接光纤组件；贯通法兰包括法兰盘、内侧螺纹接口和外侧螺纹接口,耦合接头和内侧螺纹接口螺纹连接；转接光纤组件包括第二光纤接头、插芯及转接光纤、第二光纤内护套、第二光纤外护套；第二光纤外护套一端与第二光纤接头连接,另一端设置在外侧螺纹接口内；其中一个防水接头与外侧螺纹接口螺纹连接；插芯一端插装在耦合接头内且与耦合接头胶接,另一端与第二光纤内护套连接；转接光纤一端用于与测温仪连接,另一端插装在插芯内且与插芯胶接。(The invention provides a temperature measurement optical fiber switching module and a transformer with the same, and solves the problems that an existing optical fiber structure for an oil-immersed transformer is poor in sealing performance, cannot be repeatedly plugged and pulled for use and is low in coupling efficiency. The switching module comprises a through flange, a coupling joint, two waterproof joints and a switching optical fiber assembly; the through flange comprises a flange plate, an inner side threaded connector and an outer side threaded connector, and the coupling joint is in threaded connection with the inner side threaded connector; the switching optical fiber assembly comprises a second optical fiber connector, a ferrule, a switching optical fiber, a second optical fiber inner sheath and a second optical fiber outer sheath; one end of the second optical fiber outer sheath is connected with the second optical fiber connector, and the other end of the second optical fiber outer sheath is arranged in the outer threaded connector; one of the waterproof joints is in threaded connection with the outer threaded interface; one end of the insertion core is inserted into the coupling joint and is glued with the coupling joint, and the other end of the insertion core is connected with the second optical fiber inner sheath; one end of the switching optical fiber is used for being connected with the thermodetector, and the other end of the switching optical fiber is inserted in the plug core and is glued with the plug core.)

1. The utility model provides a temperature measurement optic fibre switching module which characterized in that: the optical fiber coupling device comprises a through flange, a coupling joint (211), two waterproof joints (210) and a switching optical fiber assembly (2);

the through flange comprises a flange plate (205), an inner side threaded interface (208) and an outer side threaded interface (207), the flange plate (205) is used for being fixedly connected with the outer side wall of the transformer body (6), and the coupling joint (211) is in threaded connection with the inner side threaded interface (208);

the switching optical fiber assembly (2) comprises a second optical fiber connector (204), a ferrule (206), a switching optical fiber (201), a second optical fiber inner sheath (202) and a second optical fiber outer sheath (203) which are sequentially sleeved from inside to outside;

one end of the second optical fiber outer sheath (203) is connected with the second optical fiber connector (204), and the other end of the second optical fiber outer sheath is arranged in the outer threaded interface (207);

the two waterproof joints (210) are sleeved on the second optical fiber outer sheath (203), and one of the waterproof joints (210) is in threaded connection with the outer threaded interface (207) to realize the sealing of the second optical fiber outer sheath (203) and the outer threaded interface (207);

one end of the ferrule (206) penetrates through the through flange and then is inserted into the coupling joint (211) and is glued with the coupling joint (211), and the other end of the ferrule (206) is connected with the second optical fiber inner sheath (202);

one end of the switching optical fiber (201) penetrates through the second optical fiber connector (204) to be connected with the temperature measuring instrument, and the other end of the switching optical fiber is inserted into the ferrule (206) and is connected with the ferrule (206) in an adhesive mode.

2. The thermometric fiber optic patch module of claim 1, wherein: and a sealing gasket (9) is arranged at the matching position of the flange plate (205) and the outer side wall of the transformer body (6).

3. The thermometric fiber optic patch module of claim 2, wherein: the switching optical fiber assembly (2) further comprises a corrugated pipe (209) sleeved on the second optical fiber outer sheath (203);

and a Kaffer pull wire (212) is arranged between the switching optical fiber (201) and the second optical fiber inner sheath (202).

4. The utility model provides a take transformer of temperature measurement optic fibre switching module which characterized in that: the temperature measurement optical fiber adapter comprises a transformer body (6), a temperature measurement optical fiber adapter module and a sealing washer (9);

the temperature measurement optical fiber switching module comprises a through flange, a coupling joint (211), two waterproof joints (210) and a switching optical fiber assembly (2);

the through flange comprises a flange plate (205), an inner side threaded interface (208) and an outer side threaded interface (207), the flange plate (205) is fixedly connected to the outer side wall of the transformer body (6), and the coupling joint (211) is in threaded connection with the inner side threaded interface (208);

the sealing washer (9) is arranged between the flange plate (205) and the outer side wall of the transformer body (6);

the switching optical fiber assembly (2) comprises a second optical fiber connector (204), a ferrule (206), a switching optical fiber (201), a second optical fiber inner sheath (202) and a second optical fiber outer sheath (203) which are sequentially sleeved from inside to outside;

one end of the second optical fiber outer sheath (203) is connected with the second optical fiber connector (204), and the other end of the second optical fiber outer sheath is arranged in the outer threaded interface (207);

the two waterproof joints (210) are sleeved on the second optical fiber outer sheath (203), and one of the waterproof joints (210) is in threaded connection with the outer threaded interface (207) to realize the sealing of the second optical fiber outer sheath (203) and the outer threaded interface (207);

one end of the ferrule (206) penetrates through the through flange and then is inserted into the coupling joint (211) and is glued with the coupling joint (211), and the other end of the ferrule (206) is connected with the second optical fiber inner sheath (202);

one end of the switching optical fiber (201) penetrates through the second optical fiber connector (204) to be connected with the temperature measuring instrument, and the other end of the switching optical fiber is inserted into the ferrule (206) and is connected with the ferrule (206) in an adhesive mode.

5. The transformer with temperature measuring optical fiber switching module according to claim 4, wherein: and a flange ring (8) used for being connected with the flange plate (205) is arranged on the outer side wall of the transformer body (6).

6. The transformer with temperature measuring optical fiber switching module according to claim 5, wherein: the switching optical fiber assembly (2) further comprises a corrugated pipe (209) sleeved on the second optical fiber outer sheath (203).

7. The transformer with temperature measuring optical fiber switching module according to claim 6, wherein: and a Kaffer pull wire (212) is arranged between the switching optical fiber (201) and the second optical fiber inner sheath (202).

8. The transformer with temperature measuring optical fiber switching module according to any one of claims 4 to 7, wherein: the temperature measuring device also comprises a temperature measuring probe (1) arranged in the transformer body (6);

the temperature measuring probe (1) comprises a sheath pressing ring (14), a first optical fiber connector (15), a temperature measuring optical fiber (11), a first optical fiber inner sheath (12) and a first optical fiber outer sheath (13) which are sequentially sleeved from inside to outside;

the first optical fiber connector (15) is connected with the coupling connector (211);

the first optical fiber inner sheath (12) is provided with a notch structure along the axial direction, and the first optical fiber outer sheath (13) adopts a spiral structure;

one end of the first optical fiber outer sheath (13) is arranged in the first optical fiber connector (15) through the sheath pressing ring (14);

one end of the temperature measuring optical fiber (11) is bonded with a fluorescent material (16), and the other end of the temperature measuring optical fiber passes through the first optical fiber connector (15) and is in butt joint with the switching optical fiber (201).

9. The transformer with temperature measuring optical fiber switching module according to claim 8, wherein: the first optical fiber connector (15) and the second optical fiber connector (204) are both ST optical fiber connectors.

10. The transformer with temperature measuring optical fiber switching module according to claim 9, wherein: the temperature measuring optical fiber (11) is a quartz optical fiber;

the first optical fiber inner sheath (12) and the first optical fiber outer sheath (13) are both made of PTFE.

Technical Field

The invention relates to an optical fiber temperature measurement technology, in particular to a temperature measurement optical fiber switching module and a transformer with the temperature measurement optical fiber switching module.

Background

Oil-filled transformers are key devices of power distribution systems. The oil-immersed transformer works in the working environment of high voltage, heavy current and strong magnetic field for a long time, and can continuously generate heat in the operation process. The aging speed of the transformer is doubled when the temperature of the transformer rises by 6 ℃, and the service life is halved. The safe operation and the service life of the oil-immersed transformer depend on the safety and the reliability of the winding, so that the accurate measurement of the temperature of the winding of the transformer is very important to the service life of the transformer.

An optical fiber temperature measurement mode is adopted for the oil immersed transformer, when the temperature of a transformer winding is measured, in order to ensure the original tightness of the transformer, the temperature measurement optical fiber cannot directly extend out of the inside of the transformer, and therefore the temperature collection is realized by switching the optical fiber inside the transformer and the external optical fiber.

In order to ensure the original sealing performance of the transformer, the optical fiber structure adopted in the prior art mainly comprises a two-section type optical fiber structure and a three-section type optical fiber structure.

Two-section optical fiber structure: the method comprises the steps that a flange plate is arranged on the wall of a transformer, a through hole is formed in a through device on the flange plate, and optical fibers used for the inside and the outside of the oil-immersed transformer are inserted into the through device from two sides respectively to be butted so as to realize transmission of optical signals; in order to ensure the sealing performance, when the optical fiber connector at the end part of the optical fiber is inserted into the through device, the sealing effect is realized by the way that the rubber sealing gasket on the optical fiber connector is extruded and deformed with the wall of the through device. Because the sealing performance is guaranteed in the mode that the adopted rubber sealing washer extrudes and deforms, after the optical fiber is pulled out of the through device, the rubber sealing washer can be damaged due to extrusion, the rubber sealing washer needs to be replaced during secondary insertion, and otherwise the sealing performance of the through device cannot be guaranteed. In addition, if the rubber gasket is not inserted in place when it is inserted into the penetration device, the sealing effect is not obtained.

Three-section optical fiber structure: the flange is arranged on the wall of the transformer, the ceramic ferrule is arranged at the center of the through device on the flange, the ceramic ferrule and the through device are bonded by glue to ensure the sealing property, and when the optical fiber connector is used, the internal optical fiber and the external optical fiber are respectively in butt joint with two ends of the ceramic ferrule in the through device to transmit optical signals. Although the ceramic ferrule is sealed by glue, the single-pass optical loss can be increased by more than 10% due to one more switching.

Disclosure of Invention

The optical fiber splicing structure aims to solve the problems that the existing two-section optical fiber structure for the oil-immersed transformer has poor sealing performance and cannot be repeatedly plugged and pulled for use; or the three-section type optical fiber structure has optical loss, so that the coupling efficiency is low.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

a temperature measurement optical fiber switching module is characterized in that: the optical fiber coupling device comprises a through flange, a coupling joint, two waterproof joints and a switching optical fiber assembly;

the through flange comprises a flange plate, an inner side threaded connector and an outer side threaded connector, the flange plate is fixedly connected with the outer side wall of the transformer body, and the coupling connector is in threaded connection with the inner side threaded connector;

the switching optical fiber assembly comprises a second optical fiber connector, a ferrule, a switching optical fiber, a second optical fiber inner sheath and a second optical fiber outer sheath which are sequentially sleeved from inside to outside;

one end of the second optical fiber outer sheath is connected with the second optical fiber connector, and the other end of the second optical fiber outer sheath is arranged in the outer threaded connector;

the two waterproof joints are sleeved on the second optical fiber outer sheath, and one of the waterproof joints is in threaded connection with the outer threaded interface, so that the second optical fiber outer sheath and the outer threaded interface are sealed;

one end of the ferrule penetrates through the through flange and then is inserted into the coupling joint and is glued with the coupling joint, and the other end of the ferrule is connected with the second optical fiber inner sheath;

one end of the switching optical fiber penetrates through the second optical fiber connector and is used for being connected with the temperature measuring instrument, and the other end of the switching optical fiber is inserted in the plug core and is in adhesive joint with the plug core.

Furthermore, a sealing gasket is arranged at the matching position of the flange plate and the outer side wall of the transformer body.

Furthermore, the switching optical fiber assembly also comprises a corrugated pipe sleeved on the second optical fiber outer sheath;

and a Kaffer stay wire is arranged between the switching optical fiber and the second optical fiber inner sheath.

Meanwhile, the invention provides a transformer with a temperature measurement optical fiber switching module, which is characterized in that: the temperature measuring optical fiber adapter module comprises a transformer body, a temperature measuring optical fiber adapter module and a sealing washer;

the temperature measurement optical fiber switching module comprises a through flange, a coupling joint, two waterproof joints and a switching optical fiber assembly;

the through flange comprises a flange plate, an inner side threaded connector and an outer side threaded connector, the flange plate is fixedly connected to the outer side wall of the transformer body, and the coupling connector is in threaded connection with the inner side threaded connector;

the sealing washer is arranged between the flange plate and the outer side wall of the transformer body;

the switching optical fiber assembly comprises a second optical fiber connector, a ferrule, a switching optical fiber, a second optical fiber inner sheath and a second optical fiber outer sheath which are sequentially sleeved from inside to outside;

one end of the second optical fiber outer sheath is connected with the second optical fiber connector, and the other end of the second optical fiber outer sheath is arranged in the outer threaded connector;

the two waterproof joints are sleeved on the second optical fiber outer sheath, and one of the waterproof joints is in threaded connection with the outer threaded interface, so that the second optical fiber outer sheath and the outer threaded interface are sealed;

one end of the ferrule penetrates through the through flange and then is inserted into the coupling joint and is glued with the coupling joint, and the other end of the ferrule is connected with the second optical fiber inner sheath;

one end of the switching optical fiber penetrates through the second optical fiber connector and is used for being connected with the temperature measuring instrument, and the other end of the switching optical fiber is inserted in the plug core and is in adhesive joint with the plug core.

Furthermore, a flange ring used for being connected with the flange plate is arranged on the outer side wall of the transformer body.

Further, the switching optical fiber assembly also comprises a corrugated pipe sleeved on the second optical fiber outer sheath.

Furthermore, a Kaffer pull wire is arranged between the switching optical fiber and the second optical fiber inner sheath.

Furthermore, the temperature measuring device also comprises a temperature measuring probe arranged in the transformer body;

the temperature measuring probe comprises a sheath compression ring, a first optical fiber connector, a temperature measuring optical fiber, a first optical fiber inner sheath and a first optical fiber outer sheath which are sequentially sleeved from inside to outside;

the first optical fiber connector is connected with the coupling connector;

the first optical fiber inner sheath is provided with a notch structure along the axial direction, and the first optical fiber outer sheath adopts a spiral structure;

one end of the first optical fiber outer sheath is arranged in the first optical fiber connector through the sheath pressing ring;

one end of the temperature measuring optical fiber is bonded with a fluorescent material, and the other end of the temperature measuring optical fiber penetrates through the first optical fiber connector to be in butt joint with the switching optical fiber.

Further, the first optical fiber connector and the second optical fiber connector are both ST optical fiber connectors.

Furthermore, the temperature measuring optical fiber is a quartz optical fiber;

the first optical fiber inner sheath and the first optical fiber outer sheath are both made of PTFE.

Compared with the prior art, the invention has the advantages that:

1. in the optical fiber switching module and the transformer, the switching optical fiber and the insertion core are glued into a whole, the insertion core is inserted into the through flange and is glued with the coupling joint, so that the sealing performance of the insertion core and the coupling joint is ensured when the flange plate is connected to the outer side wall of the transformer body, the sealing performance is good, and meanwhile, the through flange is provided with the inner side threaded interface, so that repeated plugging and unplugging with a temperature measuring probe in the transformer body are facilitated;

compared with the existing two-section optical fiber, the optical fiber switching module and the transformer have good sealing performance because the switching optical fiber is in glue joint with the ferrule and the ferrule is in glue joint with the coupling joint; compare with three section formula optic fibre, switching optic fibre and lock pin integration realize being connected with temperature probe's optic fibre two section formula, promote two-way optical coupling efficiency more than 20%, and then promoted whole temperature measuring device's signal strength and stability.

2. In the optical fiber switching module and the transformer, the corrugated pipe is arranged outside the second optical fiber outer sheath, so that the length of the switching optical fiber can be adjusted, the measurement of different distances is realized, and meanwhile, the switching optical fiber is protected and prevented from being damaged.

3. In the optical fiber switching module and the transformer, the Kaff stay wire between the switching optical fiber and the second optical fiber inner sheath prevents the switching optical fiber from being pulled and damaged in the construction and use processes.

4. According to the invention, the flange ring is arranged on the outer side wall of the transformer body, so that the flange plate can be fixedly connected conveniently.

5. The transformer also comprises a temperature measuring probe, wherein a notch structure is axially arranged on a first optical fiber inner sheath of the temperature measuring probe, and a spiral structure is adopted by a first optical fiber outer sheath, so that when the temperature measuring probe is arranged in the tested transformer, the temperature measuring optical fiber and the inner part of the sheath can be fully contacted with transformer oil, the generation of partial discharge caused by the existence of air in the temperature measuring optical fiber during the operation of the transformer is prevented, and the safety of the temperature measuring probe during the use is ensured.

6. The temperature measuring probe adopts the optical fiber for measuring the temperature, the optical fiber is made of quartz materials, the insulation performance is good, and the interference of strong magnetic field, high voltage and large current generated when the transformer works is avoided, so that the measuring result is accurate and the accuracy is high.

7. The invention monitors the winding temperature through the temperature measuring probe, can improve the safe operation of the equipment (transformer), prolong the service life of the equipment, judge the actual load capacity of the equipment in time, and exert the power distribution potential to the maximum extent so as to improve the economic benefit of the equipment.

8. The temperature measuring probe can realize quick temperature measurement and accurate temperature measurement, has quick temperature judgment speed, can realize mS grade at the fastest speed, has high temperature measurement accuracy and can realize the temperature measurement within +/-1 ℃.

9. The switching optical fiber component and the temperature measuring probe of the transformer are convenient to use on site, do not need to be calibrated, and are calibrated through temperature before leaving factories.

Drawings

FIG. 1 is a schematic structural diagram of a temperature measuring optical fiber adapter module according to the present invention;

FIG. 2 is a side view of a temperature measuring fiber optic transition module of the present invention;

FIG. 3 is a schematic structural diagram of an embodiment of a transformer with a temperature measurement optical fiber adapter module according to the present invention;

FIG. 4 is a schematic structural diagram of a second embodiment of the transformer with a temperature measurement optical fiber adapter module according to the present invention (showing a portion of the transformer body);

FIG. 5 is a schematic structural diagram of a temperature measuring probe in a second embodiment of the transformer with the temperature measuring optical fiber switching module according to the present invention;

FIG. 6 is a schematic diagram of a second transformer with a temperature measuring optical fiber adapter module according to an embodiment of the present invention in cooperation with a temperature measuring instrument;

wherein the reference numbers are as follows:

1-a temperature measuring probe, 11-a temperature measuring optical fiber, 12-a first optical fiber inner sheath, 13-a first optical fiber outer sheath, 14-a sheath compression ring, 15-a first optical fiber connector and 16-a fluorescent material;

2-switching optical fiber assembly, 201-switching optical fiber, 202-second optical fiber inner sheath, 203-second optical fiber outer sheath, 204-second optical fiber joint, 205-flange plate, 206-ferrule, 207-outer side threaded joint, 208-inner side threaded joint, 209-corrugated pipe, 210-waterproof joint, 211-coupling joint and 212-Kaffer pull wire;

3-a protection box, 31-an air switch, 32-a wiring terminal, 4-a temperature measuring instrument, 5-a nixie tube, 6-a transformer body, 8-a flange ring, 81-a locking screw hole and 9-a sealing gasket.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The fluorescence optical fiber temperature measurement is realized based on the material characteristics of rare earth fluorescent substances, when the rare earth sensitive material is excited by light, electrons in the sensitive material absorb photons and jump from a low energy level to an excited state high energy level, and the electrons return to the low energy level from the high energy level to emit fluorescence. The persistent fluorescence emission after the elimination of the excitation light depends on the lifetime of the excited state. The emission usually decays exponentially, and the time constant of exponential decay can be used to measure the lifetime of the excited state, which is called fluorescence lifetime, and the length of fluorescence lifetime is determined by the temperature. The greatest advantage of using this method for temperature measurement is that the temperature of the target to be measured depends only on the time constant characteristic of the fluorescent material 16, and is not affected by other variables of the system. Therefore, compared with other temperature measurement methods, the method has the advantages of high interchangeability, good stability, no need of calibration, long service life and the like.

As shown in fig. 1 and fig. 2, in order to improve the sealing performance of the connection between the optical fiber and the tested transformer, the invention provides a temperature measurement optical fiber adapter module, which comprises a through flange, a coupling joint 211, two waterproof joints 210 and an adapter optical fiber assembly 2. The through flange comprises a flange plate 205, an inner side threaded interface 208 positioned on the left side of the flange plate 205 and an outer side threaded interface 207 positioned on the right side of the flange plate 205, the flange plate 205 is used for being fixedly connected with the outer side wall of the transformer body 6, and the coupling joint 211 is in threaded connection with the inner side threaded interface 208. The transit optical fiber component 2 comprises a second optical fiber connector 204, a ferrule 206, and a transit optical fiber 201, a second optical fiber inner sheath 202 and a second optical fiber outer sheath 203 which are sequentially sleeved from inside to outside; one end of the second optical fiber outer sheath 203 is connected with the second optical fiber connector 204, and the other end is arranged in the external threaded interface 207; the two waterproof joints 210 are sleeved on the second optical fiber outer sheath 203, and one of the waterproof joints 210 is in threaded connection with the outer threaded interface 207, so that the second optical fiber outer sheath 203 and the outer threaded interface 207 are sealed; one end of the ferrule 206 penetrates through the through flange and then is inserted into the coupling joint 211, and is glued with the coupling joint 211, and the other end of the ferrule 206 is connected with the second optical fiber inner sheath 202; one end of the adapting fiber 201 passes through the second fiber connector 204 for being connected with the temperature measuring instrument 4, the other end of the adapting fiber 201 is inserted into the insertion core 206, the adapting fiber 201 is tightly matched with the insertion core 206, and the adapting fiber 201 and the insertion core 206 are in adhesive joint for realizing sealing during assembly.

In the optical fiber adapter module of this embodiment, the adapter optical fiber 201 and the ferrule 206 are integrated by gluing to realize sealing, the ferrule 206 is inserted into the through flange and sealed with the coupling joint 211 by gluing, so that when the flange plate 205 is connected to the outer side wall of the transformer body 6, the sealing performance of the ferrule 206 and the coupling joint 211 is ensured, and meanwhile, the through flange is provided with the inner side threaded interface 208, so that repeated plugging and unplugging with a temperature measuring probe in the transformer body 6 can be realized conveniently;

compared with the existing two-section optical fiber, the optical fiber switching module of the embodiment has good sealing performance because the switching optical fiber 201 is in adhesive joint with the ferrule 206 and the ferrule 206 is in adhesive joint with the coupling joint 211; compare with three section formula optic fibre, switching optic fibre 201 and lock pin 206 integration realize being connected with temperature probe's optic fibre two section formula, promote coupling efficiency more than 20%, and then promoted whole temperature measuring device's signal strength and stability.

The optical fiber switching module of the embodiment has a very wide application space in the power industry except for being used on an oil-immersed transformer. Other industries also have wider application, such as temperature measurement and protection of special parts of trains, rapid temperature measurement and protection of parts in aerospace and the like.

As shown in fig. 3, based on the temperature measurement optical fiber adapter module, the present embodiment provides a transformer with a temperature measurement optical fiber adapter module, which includes a transformer body 6, a temperature measurement optical fiber adapter module, and a sealing gasket 9; the flange plate 205 penetrating through the flange is provided with a locking screw hole 81, the flange plate 205 is fixedly connected to the outer side wall of the transformer body 6 through a screw, the inner side thread connector 208 is positioned in the transformer body 6, the outer side thread connector 207 is positioned outside the transformer body 6, and in order to realize the sealing performance of the connection of the temperature measurement optical fiber switching module and the transformer body 6, a sealing washer 9 is arranged between the flange plate 205 and the outer side wall of the transformer body 6.

In order to facilitate the fixing connection between the transformer body 6 and the flange plate 205, the flange ring 8 used for being connected with the flange plate 205 is arranged on the outer side wall of the transformer body 6.

In the embodiment, the corrugated pipe 209 is arranged outside the second optical fiber outer sheath 203, so that the length of the switching optical fiber 201 can be adjusted, different distances can be measured, the switching optical fiber 201 is protected and prevented from being damaged, and the optical fiber can also be dustproof, insect-proof and waterproof, and the aging phenomenon caused by direct sunlight is avoided, so that the whole protection performance of the temperature measuring device is good, and the accuracy of temperature measurement is ensured; and a Kaffer stay 212 between the transition fiber 201 and the second fiber inner sheath 202 to prevent the transition fiber 201 from being damaged by pulling during construction and use.

Example two

The difference from the first embodiment is that: as shown in fig. 4, a temperature measuring probe 1 is arranged in the transformer body 6; as shown in fig. 5, the temperature measuring probe 1 includes a temperature measuring optical fiber 11, a first optical fiber inner sheath 12, a first optical fiber outer sheath 13, a sheath press ring 14 and a first optical fiber connector 15; a first optical fiber outer sheath 13 is sleeved on the first optical fiber inner sheath 12, and one end of the first optical fiber outer sheath 13 is sleeved in a first optical fiber connector 15 through a sheath pressing ring 14; one end of the temperature measuring optical fiber 11 is bonded with the fluorescent material 16, and the other end passes through the first optical fiber connector 15 to be butted with the switching optical fiber 201, wherein in fig. 4, a is a butting point.

This embodiment temperature measurement optic fibre 11 adopts the quartz fiber material, and the detection part of temperature probe 1 adopts phosphor powder coating technology, and first optic fibre inner sheath 12 adopts the PTFE material and has seted up the incision structure along the axial, and first optic fibre oversheath 13 adopts the PTFE material and be helical structure, and the optic fibre terminal surface adopts the finish polishing technology.

The first optical fiber inner sheath 12 of the temperature measuring probe 1 is provided with a notch structure and the first optical fiber outer sheath 13 which are of a spiral structure, so that the temperature measuring probe 1 is installed inside a measured transformer, the temperature measuring optical fibers 11 and the sheath are fully contacted with transformer oil, the phenomenon that partial discharge caused by air exists inside the temperature measuring optical fibers 11 during the operation of the transformer is discharged is prevented, safety accidents are caused, and the safety of the temperature measuring probe 1 during the use is guaranteed.

In the embodiment, the temperature measuring probe 1 and the switching optical fiber assembly 2 are connected on the construction site, the joint is protected by the waterproof connector 210, and the other end of the switching optical fiber assembly 2 can be conveniently connected to the protection box 33.

The first optical fiber connector 15 and the second optical fiber connector 204 of this embodiment can adopt ST optical fiber connectors, the temperature measuring optical fiber 11 and the switching optical fiber 201 are connected by matching the ST optical fiber connectors and the coupling connector 211, and the joint is protected by the waterproof connector 210, so that the connection sealing performance is improved.

As shown in fig. 6, when the transformer of this embodiment measures temperature, the switching optical fiber 201 of the switching optical fiber assembly 2 is connected to the temperature measuring instrument 4, the temperature measuring probe 1 is used to detect the temperature inside (winding) of the oil-immersed transformer, the switching optical fiber assembly 2 is used to transmit data collected by the temperature measuring probe 1 to the temperature measuring instrument 4, the temperature measuring instrument 4 processes the data and displays the data through the nixie tube 5, the temperature measuring instrument 4 is disposed in the protection box 3, and when the switching optical fiber assembly 2 passes through the protection box 3, the sealing connection can be achieved through another waterproof connector 210 on the second optical fiber outer sheath 203. An air switch 31 and a connection terminal 32 are provided in the protection box 3, and the air switch 31 is connected to an external power supply through the connection terminal 32.

Compared with the existing temperature measuring device, the temperature measuring process of the transformer of the embodiment has the following characteristics:

1. the temperature measuring optical fiber 11 is not a conductor, has good insulativity, and is not interfered by a strong magnetic field, high voltage and large current generated when the transformer works. The adoption of PT100 platinum resistor for temperature measurement must consider how to protect the device, and the anti-interference is one of the disadvantages of platinum resistor for temperature measurement.

2. The temperature measuring device can realize quick temperature measurement and accurate temperature measurement, has quick temperature judgment speed, can realize mS grade at the fastest speed, has high temperature measurement accuracy, and can realize the temperature measurement within +/-1 ℃. The platinum resistor has slower temperature measuring speed and the precision is within +/-3 ℃.

3. The transformer of the embodiment does not need to be calibrated on site, and the product is calibrated through temperature before leaving the factory. Platinum resistance thermometry requires temperature calibration and calibration after a certain period of time. Meanwhile, the aging rate of the optical fiber head is far lower than that of a temperature measuring element for measuring temperature by a platinum resistor.

4. The transformer switching optical fiber assembly 2 and the temperature measuring probe 1 are convenient to use on site and protected by the waterproof connector 210. The switching fiber 201 can be conveniently installed and connected with the protection box 3. The whole protection performance is good, and the waterproof and dustproof characteristics are strong, so that the whole optical fiber and the optical fiber connector are not influenced by the environment, and the accuracy of temperature measurement is ensured.

The above description is only for the purpose of describing the preferred embodiments of the present invention and does not limit the technical solutions of the present invention, and any known modifications made by those skilled in the art based on the main technical concepts of the present invention fall within the technical scope of the present invention.