Search

CN-121994308-A - Flow velocity and temperature composite sensing equipment and method for oil immersed transformer

CN121994308ACN 121994308 ACN121994308 ACN 121994308ACN-121994308-A

Abstract

The invention relates to the technical field of transformer monitoring, in particular to flow velocity and temperature composite sensing equipment and a flow velocity and temperature composite sensing method for an oil immersed transformer, which comprises the following steps of S1, selecting a container filled with transformer oil, repeatedly releasing a floating ball from the interior of the transformer oil at different temperatures to obtain a time mapping relation curve of the temperature of the transformer oil and the rising of the floating ball to a fixed vertex, S2, installing the floating ball on one side of a winding at the upper end of the interior of the transformer, floating the floating ball in a direction perpendicular to the flowing direction of the transformer oil, and reflecting the oil temperature at the upper side of the transformer when the floating ball rises to the fixed vertex; and S3, in the floating process of the floating ball, the transverse offset of the floating ball reflects the flowing speed of the transformer oil at the upper part, the monitoring of the oil temperature and the flow speed is realized by adopting the floating ball mode, and the electric element with high requirements on the use environment is transferred to the edge or the outside of the transformer shell, so that the calibration is convenient, the situation of being in a long-term extreme environment can be effectively avoided, and the stability of measured data is ensured.

Inventors

  • GE HAORAN
  • YU YAN

Assignees

  • 江苏旭变变压器有限公司

Dates

Publication Date
20260508
Application Date
20260319

Claims (10)

  1. 1. The flow velocity and temperature composite sensing method for the oil immersed transformer is characterized by comprising the following steps of: s1, selecting a container filled with transformer oil, and repeatedly releasing the floating ball (7) from the interior of the transformer oil at different temperatures to obtain a time mapping relation curve of the transformer oil temperature and the rising of the floating ball (7) to a fixed peak: S2, installing a floating ball (7) on one side of a winding (2) at the upper end inside the transformer (1), floating the floating ball (7) in the direction perpendicular to the flowing direction of transformer oil, wherein the time for the floating ball (7) to rise to a fixed vertex reflects the oil temperature at the upper side of the transformer (1); and S3, in the floating process of the floating ball (7), the transverse deviation of the floating ball (7) reflects the flow speed of the transformer oil at the upper part.
  2. 2. The composite sensing equipment used in the flow velocity and temperature composite sensing method for the oil immersed transformer according to claim 1 is characterized by comprising a bottom plate (5) and a top plate (9), wherein the bottom plate (5) and the top plate (9) are horizontally arranged and parallel, the distance between the bottom plate (5) and the top plate (9) is fixed, and the bottom plate (5) is fixedly connected with one side of the top end of the transformer (1) through a connecting rod (6); A floating ball release assembly is arranged on the bottom plate (5), and the floating ball (7) is released through the floating ball release assembly; A contact sensing assembly is arranged at the top plate (9), and the time of the floating ball (7) moving from the bottom plate (5) to the top plate (9) is obtained through the contact sensing assembly, so that the oil temperature at the moment is obtained by referring to a mapping relation curve; the transverse offset distance of the floating ball (7) is obtained through the contact sensing assembly, and the oil flow speed at the moment is obtained by combining the floating time of the floating ball (7).
  3. 3. The compound sensing device used for the flow velocity and temperature compound sensing method for the oil immersed transformer is characterized in that a magic sub-patch is arranged at the top end of a floating ball (7), a magic mother patch is arranged at the bottom end of a top plate (9), and when the floating ball (7) contacts the top plate (9), the magic sub-patch is attached to the magic mother patch and is used for stopping after the floating ball (7) contacts the top.
  4. 4. A composite sensing device for use in a flow rate and temperature composite sensing method for an oil immersed transformer according to claim 2 or 3, characterized in that rectifying plates (13) can be mounted on the front and rear sides of the bottom plate (5) for reducing turbulence and diagonal flow between the bottom plate (5) and the top plate (9).
  5. 5. The composite sensing device used in the flow speed and temperature composite sensing method for the oil immersed transformer according to claim 2 or 3, wherein an air cavity (71) is arranged inside the floating ball (7) and used for providing lifting force, a cavity part (72) is formed in the bottom end of the floating ball (7) in a suddenly flat manner, and additional resistance exists when the floating ball (7) ascends due to the existence of the cavity part (72).
  6. 6. The compound sensing device used in the flow speed and temperature compound sensing method for the oil immersed transformer according to claim 5, wherein the floating ball release assembly is an electric clamp, and clamping and release of the floating ball are realized through clamping plates on two sides of the electric clamp.
  7. 7. The compound sensing device used in the flow speed and temperature compound sensing method for the oil immersed transformer according to claim 5, wherein the floating ball release assembly comprises a wire roller (53) and a pulley (51), the wire roller (53) and the pulley (51) are both rotatably connected to the inner side of the bottom plate (5), a pull rope (52) is wound on the surface of the wire roller (53), the other end of the pull rope (52) is fixedly connected with the bottom end of the floating ball (7) after being turned by the pulley (51), and the floating ball (7) can be recycled by tightening and releasing the pull rope (52).
  8. 8. The compound sensing device used in the flow speed and temperature compound sensing method for the oil immersed transformer according to claim 7, wherein the compound sensing device further comprises a motor (8), the motor (8) is fixed on the outer side of the transformer (1), a driving rod (54) is fixedly connected to the output end of the motor (8), the driving rod (54) stretches into the inner side of the bottom plate (5) and is fixedly connected with a second bevel gear (56), a wire roller (53) is coaxially and fixedly connected with a first bevel gear (55), the first bevel gear (55) is meshed with the second bevel gear (56), and release and recovery of the floating ball (7) are achieved through rotation of the motor (8).
  9. 9. The compound sensing device used in the flow speed and temperature compound sensing method for the oil immersed transformer according to claim 2 or 3 is characterized in that the contact sensing assembly comprises a hinging rod (10), a force sensor (12) and a clamping rod (14), the top end of the hinging rod (10) is fixedly connected with the inner side of the top end of the transformer (1), the bottom end of the hinging rod (10) is rotatably connected with one end of a top plate (9) through a hinge, the top end of the clamping rod (14) is fixedly connected with the inner side of the top end of the transformer (1), the clamping rod (14) is arranged in an L shape, the other end of the top plate (9) is placed at a corner of the clamping rod (14), the top end of the top plate (9) is fixedly connected with a top rod (11), the force sensor (12) is also installed at the top end of the transformer (1), and the top end of the top rod (11) is in contact with the input end of the force sensor (12); when the floating ball (7) is in upward contact with the top plate (9), the reading of the force sensor (12) is suddenly changed, so that the time when the floating ball (7) is released to be in contact with the top plate (9) can be judged; When the floating ball (7) is in upward contact with the top plate (9), because one end of the top plate (9) is hinged, the top plate (9) forms a lever structure, the closer the floating ball (7) is to the clamping rod (14), the more obvious the reading change of the force sensor (12) is, and accordingly the transverse offset distance when the floating ball (7) is in contact with the top plate (9) after being released can be judged.
  10. 10. The composite sensing equipment used for the flow rate and temperature composite sensing method for the oil-immersed transformer, which is disclosed in claim 9, is characterized in that the top end of the transformer (1) is detachably connected with an open hole cover (4), and the force sensor (12) is arranged on the lower side of the open hole cover (4).

Description

Flow velocity and temperature composite sensing equipment and method for oil immersed transformer Technical Field The invention relates to the technical field of transformer monitoring, in particular to flow speed and temperature composite sensing equipment and method for an oil immersed transformer. Background The oil tank is a direct carrier for bearing the internal transformer, and the transformer oil in the oil tank is a direct carrier for transferring heat and cooling a heat source, so that the research on the temperature characteristics of the internal oil flow is a basis for guaranteeing the safe, stable and efficient operation of the transformer. When the oil immersed transformer is in an operating state, temperature is the most intuitive index reflecting thermal characteristics. Electromagnetic loss is generated on the internal winding, the iron core and other components of the oil tank, the electromagnetic loss is finally converted into heat energy, most of the heat is transmitted to the external heat radiation fins through circulating oil, and cooling is realized, as shown in figure 1, the transformer oil is enabled to ascend due to temperature rise at the winding 2 and then move outwards, and because of the existence of the heat radiation fins 3 at the outer wall, cooling and descending are realized at the outer wall, so that circulation is realized; The inside of the transformer has the characteristics of high temperature, high electromagnetic interference and the like, and has great influence on the service life and precision of the existing sensor; The temperature has obvious influence on the viscosity of the transformer oil, the temperature of the transformer oil can be reflected through the viscosity, the rising speed of the floating ball in the transformer oil is mainly determined by the viscosity, the density is not obvious to the change of the temperature, the invention can provide the composite sensing equipment for simultaneously detecting the temperature and the flow rate, through ingenious simple mechanical structure, carry out audio-visual reaction to temperature and velocity of flow simultaneously to the electrical component that requires high to the service environment shifts to transformer casing edge or outside, can effectively avoid being in long-term extreme environment, thereby effectual assurance measured data's stability. Disclosure of Invention The invention aims to provide flow speed and temperature composite sensing equipment and method for an oil immersed transformer, which are characterized in that a time relation curve between the temperature of transformer oil and the rising of a floating ball to a fixed peak is obtained through early experiments, then the floating ball floats in a direction perpendicular to the flowing direction of the transformer oil, the rising speed of the floating ball reflects the oil temperature of the transformer, and the transverse deviation of the rising of the floating ball reflects the flowing speed of the transformer oil. In order to achieve the purpose, the invention provides the following technical scheme that the flow velocity and temperature composite sensing method for the oil immersed transformer comprises the following steps of: s1, selecting a container filled with transformer oil, repeatedly releasing the floating ball from the interior of the transformer oil at different temperatures, and obtaining a time mapping relation curve of the transformer oil temperature and the rising of the floating ball to a fixed peak: S2, mounting a floating ball on one side of a winding at the upper end of the inside of the transformer, floating the floating ball in a direction perpendicular to the flowing direction of transformer oil, and reflecting the oil temperature at the upper side of the transformer when the floating ball rises to a fixed vertex; And S3, in the floating process of the floating ball, the transverse deviation of the floating ball reflects the flow speed of the transformer oil at the upper part. According to the invention, through a smart and simple mechanical structure, the oil temperature and the flow rate are monitored simultaneously in a floating ball mode, and the electric elements with high requirements on the use environment are transferred to the edge or the outside of the transformer shell, so that the calibration is convenient, the situation of being in a long-term extreme environment can be effectively avoided, and the stability of measured data is effectively ensured. The composite sensing equipment used in the flow speed and temperature composite sensing method for the oil immersed transformer comprises a bottom plate and a top plate, wherein the bottom plate and the top plate are horizontally arranged and parallel, the distance between the bottom plate and the top plate is fixed, and the bottom plate is fixedly connected with one side of the top end of the transformer through a connecting rod; the distance betwee