CN213933588U - System for moisture in on-line monitoring transformer oil - Google Patents

Abstract

The utility model relates to a system for moisture in on-line monitoring transformer oil, including setting up get hydraulic fluid port A and get hydraulic fluid port B on the transformer oil tank body, the two is adjacent to arrange side by side, get hydraulic fluid port A and get and be equipped with valve a and valve B on the hydraulic fluid port B respectively, correspond to get hydraulic fluid port A and get hydraulic fluid port B and connect and be equipped with an H venturi tube, two mouths of pipe in one end of H venturi tube are to connecing respectively getting hydraulic fluid port A and getting hydraulic fluid port B, are equipped with valve c and valve d on two mouths of pipe in the other end of H venturi tube respectively, install the optical fiber a little in the middle waist pipe of H venturi tube, the both ends of the optical fiber a little are connected with laser source and photo detector respectively, the photo detector passes through cable and the backstage computer terminal communication connection of system; the system can accurately measure the value of the moisture in the transformer oil, and overcomes many defects of the traditional detection method.

Description

System for moisture in on-line monitoring transformer oil

Technical Field

The utility model belongs to the technical field of electrical detection equipment technique and specifically relates to a system for moisture in on-line monitoring transformer oil is related to.

Background

With the rapid development of the power industry and the continuous improvement of the voltage grade of the transformer, the maintenance of the transformer is more and more important. Wherein, transformer oil plays insulating, heat dissipation and arc extinction effect in the transformer operation. Normal transformer oil contains little moisture, but the oilpaper insulation decomposes under the influence of electrical and thermal failures. In addition, the micro-water content in the oil sample can be gradually increased in long-term operation and under the influence of the external environment. The increase of the micro-water content can cause the insulation effect of the transformer oil to be greatly reduced, and threatens the safe operation of the transformer. Therefore, the micro water content in oil is a vital parameter in the maintenance of the high-voltage-class oil-immersed power transformer.

At present, the detection method of the water amount in the transformer oil mainly comprises off-line monitoring and on-line monitoring. The off-line monitoring method mainly comprises a distillation method, a chromatography method, a gravimetric method, a chemical titration method based on the Karl Fischer method and the like, and the on-line monitoring method mainly comprises a gas chromatography method, a dielectric constant method and the like. Off-line monitoring generally requires periodic oil extraction, and is difficult to monitor micro-water content change in real time and find early faults in time. In the existing online monitoring method, the gas chromatography needs to be calibrated frequently, and the dielectric constant method has high requirements on the thin film capacitor, so that the cost is high and the large-scale use is difficult.

Disclosure of Invention

The utility model aims at providing a system of moisture in on-line monitoring transformer oil to above-mentioned condition, moisture numerical value size in measurement transformer oil that this system can be accurate overcomes many weak points of traditional detection method.

The utility model has the following concrete scheme: the utility model provides a system of moisture in on-line monitoring transformer oil, is including setting up the hydraulic fluid port A of getting on the transformer oil tank body and getting hydraulic fluid port B, the two is adjacent arranges side by side, get and be equipped with valve an and valve B on hydraulic fluid port A and the hydraulic fluid port B respectively, correspond and get hydraulic fluid port A and get hydraulic fluid port B and connect and be equipped with an H venturi tube, two mouths of a pipe in the one end of H venturi tube are to connecing respectively getting hydraulic fluid port A and getting hydraulic fluid port B, are equipped with valve c and valve d on two mouths of pipe in the other end of H venturi tube respectively, install the optical fiber of receiving a little in the middle waist pipe of H venturi tube, receive the both ends of optical fiber a little and be connected with laser source and photo detector respectively, photo detector passes through cable and the backstage computer terminal communication connection of system.

Further, the utility model discloses in the outside of H venturi tube still covers and is equipped with an optical instrument shielding room, and this optical instrument shielding room covers laser source, photo detector and receive optic fibre wholly inside it with receiving a little.

Further, the utility model discloses in computer terminal is including host computer, data collection station and display device.

Further, in the utility model discloses in two mouths of pipe of H venturi tube one end all adopt the detachable mode to connect with getting on the oil pick-up A and the oil pick-up B that correspond.

The utility model discloses following beneficial effect has:

1. the micro-nano optical fiber on-line monitoring can be directly arranged in the transformer oil tank on site, an oil sample does not need to be extracted, the stability is good, the detection speed can reach a real-time level, the production and preparation cost is low, and the acquired data is transmitted to a monitoring background computer terminal in real time;

2. the micro-nano optical fiber in the utility model has the advantages of small volume, fast response speed, strong reliability, no electromagnetic interference, safe operation in inflammable and explosive environments and the like, so that the use stability and accuracy of the whole system are guaranteed;

3. through the adjustment of the valve a, the valve b, the valve c and the valve d, the operations of inspection and replacement of the micro-nano optical fiber, maintenance of the transformer oil drain hanging cover and the like can be realized, and later-stage equipment maintenance is facilitated.

Drawings

FIG. 1 is a schematic structural diagram of an original transformer oil tank (including a conventional oil extraction port);

FIG. 2 is a schematic diagram of the overall system structure of the present invention;

fig. 3 is a block diagram of the subsequent work flow of the light detector of the present invention.

In the figure: 1-valve a, 2-oil taking port A, 3-valve B, 4-oil taking port B, 5-transformer oil tank body, 6-background computer terminal, 7-photodetector, 8-optical instrument shielding chamber, 9-valve c, 10-H-shaped tube, 11-valve d, 12-micro-nano optical fiber and 13-laser light source.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the utility model is used, and are only for convenience of describing the present invention or simplifying the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed or operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 and 2, the utility model relates to a system for moisture in on-line monitoring transformer oil, including setting up get hydraulic fluid port A2 and get hydraulic fluid port B4 on the transformer oil tank body 5, the two is adjacent arranges side by side, get hydraulic fluid port A and get and be equipped with valve a1 and valve B3 on the hydraulic fluid port B respectively, corresponding get hydraulic fluid port A and get hydraulic fluid port B and connect and be equipped with an H venturi tube 10, two mouths of pipe in the one end of H venturi tube are to connecing respectively getting hydraulic fluid port A and getting hydraulic fluid port B, are equipped with valve c9 and valve d11 on two mouths of pipe in the other end of H venturi tube respectively, install micro-nano optical fiber 12 in the middle waist pipe of H venturi tube, the both ends of micro-nano optical fiber are connected with laser light source 12 and photodetector 7 respectively, photodetector passes through cable and the backstage computer terminal 6 communication connection of system.

Furthermore, in this embodiment, an optical instrument shielding chamber 8 is covered outside the H-shaped tube, and integrally covers the laser light source, the light detector and the micro-nano optical fiber inside the optical instrument shielding chamber.

Further, in this embodiment, the computer terminal includes a computer host, a data collector, and a display device.

Further, in this embodiment, two mouths of pipe of H venturi tube one end all adopt the detachable mode to connect with getting oil mouth A and getting oil mouth B on corresponding.

Referring to fig. 2 and 3, the utility model discloses get a detachable H venturi tube of oil port A and B department installation in the former of transformer tank body, also can be the pipe of U-shaped shape (its lower extreme of U-shaped pipe is with getting oil port A and get oil port B and communicate respectively), convenient to detach just, will receive optic fibre a little and install in H venturi tube, the both ends of H venturi tube have adjustable laser source and photo detector respectively for the transmission with receive optical signal, and guarantee that the leakproofness of H shape pipeline is intact. And the micro water detection in the transformer oil can be started by opening the valve a and the valve b and closing the valve c and the valve d. In the whole detection system, the evanescent field distribution characteristic of the micro-nano optical fiber can realize the sensing of the micro-water in the oil, the change of the micro-water content causes the change of the refractive index, the distribution condition of the evanescent field of the micro-nano optical fiber is influenced, and the optical power loss caused by the distribution of the evanescent field of the micro-nano optical fiber with a specific diameter has positive correlation with the micro-water content in the oil, so that the measurement of the micro-water content in the transformer oil is realized. The light detector compares the collected light power with the light power emitted by an adjustable laser light source (laser emitter), and the micro-water content in the transformer oil is obtained through the calculation of a program on a background computer terminal host, so that the detection of the water in the transformer oil is completed, the long-term stability and the accuracy of the measurement are ensured, and the problem of accurate measurement of the water content in the transformer oil can be well solved.

Meanwhile, the adjustable laser light source, the micro-nano optical fiber and the optical detector are arranged in a shielding chamber of the optical instrument, so that the optical instrument is prevented from being polluted by the external environment. In order to facilitate the inspection and replacement of the micro-nano optical fiber, the inspection and replacement of the micro-nano optical fiber can be realized by closing the valve a and the valve b and opening the valve c and the valve d; when the transformer needs to be hung with a cover for maintenance and oil drainage, the oil drainage work of the transformer can be realized through opening the valve a and the valve b and opening the valve c and the valve d, or the oil drainage work of the transformer can be realized through closing the valve a and the valve b, and after the adjustable laser emitter, the micro-nano optical fiber and the optical detector are detached, the valve a and the valve b are opened again.

In this embodiment, the photodetector and the micro-nanofiber are both available in the market, and are not described herein again.

The utility model discloses can directly arrange the online monitoring of receiving optic fibre a little in on-the-spot transformer tank, need not to extract oil appearance, stability is good, and detection speed can reach real-time level, and preparation low cost produces to data real-time transmission to control backstage computer terminal who will gather.

The utility model provides a receive optic fibre a little has advantages such as small, response speed is fast, the good reliability, do not receive electromagnetic interference and safe work in inflammable and explosive environment, therefore entire system's stability in use and accuracy are secure.

Claims (4)

1. The utility model provides a system of moisture in on-line monitoring transformer oil, is including setting up the hydraulic fluid port A of getting on the transformer oil tank body and getting hydraulic fluid port B, and the two is adjacent arranges side by side, gets and is equipped with valve a and valve B, its characterized in that on hydraulic fluid port A and the hydraulic fluid port B of getting respectively: an H-shaped pipe is connected with the oil taking port A and the oil taking port B correspondingly, two pipe orifices in one end of the H-shaped pipe are respectively connected with the oil taking port A and the oil taking port B, two pipe orifices in the other end of the H-shaped pipe are respectively provided with a valve c and a valve d, a micro-nano optical fiber is installed in a middle waist pipe of the H-shaped pipe, two ends of the micro-nano optical fiber are respectively connected with a laser light source and a light detector, and the light detector is in communication connection with a background computer terminal of the system through a cable.

2. The system for on-line monitoring of moisture in transformer oil according to claim 1, wherein: an optical instrument shielding chamber is covered outside the H-shaped pipe, and a laser light source, a light detector and the micro-nano optical fiber are integrally covered inside the optical instrument shielding chamber.

3. The system for on-line monitoring of moisture in transformer oil according to claim 1, wherein: the computer terminal comprises a computer host, a data acquisition unit and a display device.

4. The system for on-line monitoring of moisture in transformer oil according to claim 1, wherein: two mouths of pipe of H venturi tube one end all adopt detachable mode to connect with getting on the oil pick-up A that corresponds and getting oil pick-up B.

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