CN113884211A - Optical fiber temperature sensor for measuring temperature field of transformer winding - Google Patents
Optical fiber temperature sensor for measuring temperature field of transformer winding Download PDFInfo
- Publication number
- CN113884211A CN113884211A CN202111121061.XA CN202111121061A CN113884211A CN 113884211 A CN113884211 A CN 113884211A CN 202111121061 A CN202111121061 A CN 202111121061A CN 113884211 A CN113884211 A CN 113884211A
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- China
- Prior art keywords
- optical fiber
- temperature
- transformer
- sensing optical
- protective sleeve
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
- G01K1/12—Protective devices, e.g. casings for preventing damage due to heat overloading
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
Abstract
The invention discloses an optical fiber temperature sensor for measuring a transformer winding temperature field, which comprises a sensing optical fiber, wherein one end of the sensing optical fiber is in a free state, the other end of the sensing optical fiber is an optical fiber connector, a high-temperature-resistant protective sleeve is sleeved outside the sensing optical fiber, and air grooves which are uniformly distributed are arranged on the surface of the high-temperature-resistant protective sleeve and are used for ensuring air removal between the inside of the protective sleeve and the sensing optical fiber when a transformer is vacuumized. The invention has the beneficial effects that: the sensing optical fiber with the single end in a free state not only can effectively eliminate optical fiber synchronous contraction possibly caused by contraction of the protective sleeve at high temperature, but also can ensure that a temperature measuring point is not stressed so as to avoid temperature strain crosstalk and improve temperature measuring precision; the high-temperature-resistant protective sleeve plays a role in protecting the internal optical fiber from being damaged by external force; the air groove ensures that no air bubble remains in the whole sensor when the transformer is filled with oil, avoids adverse effect on the insulation performance of the transformer, and ensures accurate measurement and reliable operation of the temperature field in the transformer winding.
Description
Technical Field
The invention relates to the field of transformer monitoring, in particular to an optical fiber temperature sensor for measuring a transformer winding temperature field.
Background
Transformers are one of the most important electrical devices in power supply systems. In the long-term operation process of the equipment, the contact resistance is overlarge and generates heat due to manufacture, transportation, poor installation, overload and aging, and if the temperature of the heating parts cannot be monitored and cannot be overhauled in time, the fire accident can be caused finally.
At present, in the field of transformers in China, a method for measuring the temperature of a transformer winding by using a point type optical fiber is gradually accepted. The point-mode temperature measurement method can only monitor the temperature of the specified positions of the winding and the iron core, cannot completely reflect the temperature of the winding and the iron core, and has a dead zone for monitoring the overheating fault of the transformer. In addition, the existing sensor protection sleeve structure is easy to have residual gas after vacuum pumping, and air bubbles may exist between the sleeve and the optical fiber, so that the insulation performance of the transformer is adversely affected.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides an optical fiber temperature sensor for measuring the winding temperature field of a transformer, in particular to an optical fiber temperature sensor for measuring the winding temperature field of an oil-immersed transformer, which has the advantages of accurate temperature measurement, continuity, no blind area, insulation, corrosion resistance, stability and reliability, can monitor the winding temperature field distribution of the transformer in the oil flow change state in real time, find the hot spot position of the winding of the transformer in time, eliminate faults and potential safety hazards, and improve the operation reliability of the transformer.
The object of the present invention is achieved by the following technical means. The utility model provides an optic fibre temperature sensor for transformer winding temperature field measurement, includes sensing optical fiber, and sensing optical fiber one end is free state, and the other end is optical fiber splice, sensing optical fiber overcoat has high temperature resistant protective case, high temperature resistant protective case is equipped with evenly distributed's air groove on the surface for guarantee when the transformer evacuation that the air between the inside protective case of portion and the sensing optical fiber is got rid of.
The high-temperature-resistant protective sleeve is made of polytetrafluoroethylene materials or other materials and protects the optical fibers from being damaged by external force in the embedding and pressing process of the device body.
The air groove is rectangular.
The optical fiber joint is a high-temperature-resistant oil-tight joint.
The sensing optical fiber is a high-temperature resistant coated optical fiber.
The invention has the beneficial effects that: the sensing optical fiber with the single end in a free state can effectively eliminate optical fiber synchronous contraction possibly caused by contraction of the protective sleeve at high temperature, and can ensure that a temperature measuring point is not stressed so as to avoid temperature strain crosstalk and improve temperature measuring precision. The polytetrafluoroethylene protection tube has a high temperature resistant function, and meanwhile, the polytetrafluoroethylene protection tube also plays a role in protecting the internal optical fiber from being damaged by external force, so that the service life of the sensor is prolonged, and the stability of the sensor is improved. The surface of the polytetrafluoroethylene protection tube is provided with the air groove, so that no air bubble is left in the whole sensor when the transformer is filled with oil, the adverse effect on the insulating property of the transformer is avoided, and the accurate measurement and reliable operation of the temperature field in the transformer winding are ensured.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Description of reference numerals: sensing optical fiber 1, high temperature resistant protective sleeve 2, air groove 3, optical fiber connector 4.
Detailed Description
The invention will be described in detail with reference to the following figures and examples:
as shown in fig. 1, fig. 1 is a schematic structural diagram of the present invention: the utility model provides an optic fibre temperature sensor for transformer winding temperature field measurement, includes sensing optical fiber 1, and sensing optical fiber 1 one end is free state, guarantees can not be because of outer protective sheath pipe bending and pulling force at the in-process of laying, avoids temperature stress to crosstalk, ensures that the temperature measurement is accurate. The other end is an optical fiber connector 4, and the optical fiber connector 4 is connected with an optical fiber flange head on a through plate of the transformer box body in a plugging and pulling manner. The sensing optical fiber 1 is externally sleeved with a high-temperature-resistant protective sleeve 2, and rectangular air grooves 3 which are uniformly distributed are formed in the surface of the high-temperature-resistant protective sleeve 2 and used for ensuring air between the inside of the protective sleeve and the sensing optical fiber to be removed when the transformer is vacuumized. It should be noted that the sensing fiber 1 may be replaced by a quasi-distributed fiber grating string.
The high-temperature-resistant protective sleeve 2 is made of polytetrafluoroethylene materials, the long-term use temperature of the high-temperature-resistant protective sleeve is far higher than the drying temperature of the transformer body and the maximum long-term operation temperature of the transformer body, and the internal optical fibers are guaranteed not to be damaged by external force for a long time. Specifically, the polytetrafluoroethylene sleeve needs to be kept in an oven at 130 ℃ for 24 hours before use, and stress is released.
The optical fiber connector 4 is a high-temperature-resistant oil-tight connector, and ensures that transformer oil cannot leak from a connection part after being connected to the through plate.
The sensing optical fiber 1 is a high-temperature resistant coated optical fiber, and specifically, the coating layer material of the sensing optical fiber 1 is polyimide.
The air tank 4 ensures that no gas is left in the whole sensor, avoids adverse effects on the insulation performance of the transformer, and ensures accurate measurement and reliable operation of the temperature field in the transformer winding.
The traditional thermocouple temperature sensor cannot be used for measuring the winding temperature field in the transformer due to the conductivity of the traditional thermocouple temperature sensor, so that the hot point of the winding of the transformer cannot be sensed, and the early warning on the possible overhigh temperature and fire accidents cannot be carried out in advance. The optical fiber sensor with the high-temperature-resistant coating has the advantages of continuous non-blind-area monitoring, strong anti-electromagnetic interference capability, high-temperature corrosion resistance and the like, a single transmission optical fiber can realize distributed measurement on a winding temperature field, the temperature measurement range of the temperature measurement sensor is-50-180 ℃, the temperature measurement precision reaches 0.5 ℃, a polytetrafluoroethylene high-temperature-resistant sleeve is adopted to protect the sensor from being influenced by external force, air grooves are uniformly formed in the sleeve, the condition that no bubbles exist in the sleeve after vacuumizing and oil injection is ensured, and the adverse influence on the operation of a transformer is avoided. The optical fiber temperature sensor can be arranged in a transformer winding to accurately measure the temperature field distribution and has great application value in an intelligent optical fiber transformer.
The principal features and advantages of the invention have been shown and described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. An optical fiber temperature sensor for measuring a temperature field of a transformer winding is characterized in that: including sensing optical fiber (1), sensing optical fiber (1) one end is free state, and the other end is optical fiber splice (4), sensing optical fiber (1) overcoat has high temperature resistant protective case (2), high temperature resistant protective case (2) are equipped with evenly distributed's air groove (3) on the surface for guarantee when the transformer evacuation that the air between protective case inside and the sensing optical fiber is got rid of.
2. The fiber optic temperature sensor for transformer winding temperature field measurement according to claim 1, wherein: the high-temperature-resistant protective sleeve (2) is made of polytetrafluoroethylene materials.
3. The fiber optic temperature sensor for transformer winding temperature field measurement according to claim 1, wherein: the air groove (3) is rectangular.
4. The fiber optic temperature sensor for transformer winding temperature field measurement according to claim 1, wherein: the optical fiber joint (4) is a high-temperature-resistant oil-tight joint.
5. The fiber optic temperature sensor for transformer winding temperature field measurement according to claim 1, wherein: the sensing optical fiber (1) is a high-temperature resistant coated optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111121061.XA CN113884211A (en) | 2021-09-24 | 2021-09-24 | Optical fiber temperature sensor for measuring temperature field of transformer winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111121061.XA CN113884211A (en) | 2021-09-24 | 2021-09-24 | Optical fiber temperature sensor for measuring temperature field of transformer winding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113884211A true CN113884211A (en) | 2022-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111121061.XA Pending CN113884211A (en) | 2021-09-24 | 2021-09-24 | Optical fiber temperature sensor for measuring temperature field of transformer winding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113884211A (en) |
-
2021
- 2021-09-24 CN CN202111121061.XA patent/CN113884211A/en active Pending
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