Interface strain measurement system of basin-type insulator

Abstract

The utility model discloses an interface strain measurement system of a basin-type insulator, which comprises a basin-type insulator mold, an aluminum bar is inserted in the basin-type insulator mold, a sensor group is arranged on the side wall of the aluminum bar, the sensor group is connected with an optical fiber demodulator, and the optical fiber demodulator is connected with an upper computer. The strain measurement system provided by the utility model can monitor the stress change at the interface of the basin-type insulator in real time.

Description

Technical Field

[0001] The utility model belongs to the technical field of insulator interface strain measuring devices, and in particular relates to an interface strain measuring system for a pot-type insulator. Background Art

[0002] The pot insulator is widely used in the power system. For example, the busbars of overhead transmission lines, power plants and substations, and the external live conductors of various electrical equipment must be supported by pot insulators. The pot insulator is generally made of insulating parts and metal inserts glued or mechanically clamped with adhesives. Most of the insulating parts are made of epoxy resin, and most of the metal inserts are iron caps, flanges, etc. In the production process of pot insulators, epoxy resin is combined with the metal conductor part through curing. During the curing process of epoxy resin, a large amount of residual stress will be generated due to the curing shrinkage and cooling shrinkage process. The existence of residual stress will directly affect the mechanical strength of the pot insulator interface, and then make the pot insulator prone to damage during service. Therefore, in the production process of pot insulators, it is necessary to monitor the stress at the pot insulator interface during the curing process. However, the existing monitoring system needs to lay sensors on the surface of epoxy resin. The mold used to prepare pot insulators is thick and heavy, and it is difficult to lay sensors. Therefore, the existing monitoring system is not suitable for the interface stress monitoring of pot insulators. Utility Model Content

[0003] The utility model aims to provide an interface strain measurement system for a pot-type insulator, which can monitor stress changes at the interface of the pot-type insulator in real time.

[0004] The technical solution adopted by the utility model is an interface strain measurement system for a pot-type insulator, comprising a pot-type insulator mold, an aluminum rod inserted in the pot-type insulator mold, a sensor group arranged on the side wall of the aluminum rod, the sensor group connected to a fiber optic demodulator, and the fiber optic demodulator connected to a host computer.

[0005] The utility model is also characterized in that:

[0006] Furthermore, the pot-type insulator mold includes a shell, a cavity is arranged in the shell, a gate is arranged on the shell, the gate is connected to one end of the cavity, a socket is arranged at the center of the convex surface of the shell, the socket is connected to the cavity, and an aluminum rod is inserted into the socket.

[0007] Furthermore, silicon sealant is provided between the aluminum rod and the insertion hole.

[0008] Furthermore, the sensor group includes a first fiber grating sensor and a second fiber grating sensor, both of which are arranged on the side wall of the aluminum rod, and both of which are connected to a fiber demodulator.

[0009] Furthermore, the first fiber grating sensor and the second fiber grating sensor are centrally symmetrically arranged along the axis of the aluminum rod.

[0010] The beneficial effects of the utility model are:

[0011] (1) The interface strain measurement system of the pot-type insulator of the utility model can monitor the stress at the interface between the pot-type insulator and the aluminum rod in real time during the curing process of the pot-type insulator by arranging the first fiber grating sensor and the second fiber grating sensor on the aluminum rod. Through continuous strain monitoring, the service life of the pot-type insulator can be predicted;

[0012] (2) In the interface strain measurement system of the pot-type insulator of the utility model, the first fiber grating sensor and the second fiber grating sensor are centrally symmetrically arranged along the axis of the aluminum rod. Since the pot-type insulator mold 1 is a centrally symmetrical figure, the measured data can be considered as the temperature and stress data of the same point, which greatly improves the accuracy of the data. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the interface strain measurement system of the pot-type insulator of the utility model;

[0014] Figure 2 It is a structural schematic diagram of a pot-type insulator mold in the interface strain measurement system of the pot-type insulator of the utility model;

[0015] Figure 3 This is a connection diagram of the sensor assembly in the interface strain measurement system of the pot-type insulator of the utility model.

[0016] In the figure, 1. pot-type insulator mold, 2. aluminum rod, 3. first fiber grating sensor, 4. second fiber grating sensor, 5. gate, 6. jack, 7. fiber demodulator, 8. host computer, 9. shell, 10. cavity. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] Example 1

[0019] The utility model discloses an interface strain measurement system for a pot-type insulator, the structure of which is as follows: Figure 1As shown, it includes a basin insulator mold 1, an aluminum rod 2 is inserted in the basin insulator mold 1, a sensor group is arranged on the side wall of the aluminum rod 2, the sensor group is used to obtain temperature and stress data, the sensor group is connected to the optical fiber demodulator 7, the optical fiber demodulator 7 is connected to the host computer 8, the optical fiber demodulator 7 is LS-FIJZ-08, the optical fiber demodulator is purchased from Shenzhen Lingsi Optoelectronics Technology Co., Ltd., and the host computer 8 is installed with a basin insulator curing process digital twin model, the basin insulator curing process digital twin model calculates the current curing degree field, temperature field and stress field distribution according to the temperature measured by the sensor group, and performs The digital twin model of the curing process of basin insulators is visualized and specifically adopts the model recorded in the Chinese invention patent with application number: 2022100254816 and name: Basin insulator stress monitoring system based on digital twin technology. The digital twin model of the curing process of basin insulators is established through the comsol software, which includes a solid heat transfer module and a stress deformation module. The solid heat transfer module is used to convert the temperature measured by the first fiber grating sensor 3 into a temperature field and a curing degree field. The temperature field and the curing degree field are bidirectionally coupled. The stress deformation module is used to solve the stress field distribution and is unidirectionally coupled with the solid heat transfer module.

[0020] Example 2

[0021] Based on Example 1, the structure is as follows Figure 2 As shown, the pot-type insulator mold 1 includes a shell 9, which is a pot-shaped structure. A cavity 10 is arranged in the shell 9. The shape of the cavity 10 is consistent with the shape of the pot-type insulator to be formed. A gate 5 is arranged on the shell 9, and the gate 5 is connected with one end of the cavity 10. Epoxy resin is injected into the cavity 10 through the gate 5 for subsequent curing and molding. A socket 6 is arranged at the center of the convex surface of the shell 9, and the socket 6 is connected with the cavity 10. An aluminum rod 2 is inserted in the socket 6, and the aluminum rod 2 extends into the cavity 10 and contacts with the inner wall of the cavity 10. Silicone sealant is arranged between the aluminum rod 2 and the socket 6. By arranging the silicone sealant, it is possible to prevent the injected epoxy resin from overflowing through the socket 6, thereby greatly improving the sealing performance.

[0022] Furthermore, the shell 9 includes an upper shell and a lower shell, and grooves are provided in the upper shell and the lower shell, and the two grooves constitute a cavity, and the shape of the cavity is consistent with the shape of the pot-type insulator to be formed, and grooves I are provided at the ends of the upper shell and the lower shell, and the grooves I are connected with the grooves, and the two grooves I constitute a gate, and the gate is connected with the cavity, and a jack 6 is provided on the side wall of the upper shell and at a position corresponding to the center position of the groove; by setting the upper shell and the lower shell, the disassembly and cleaning of the pot-type insulator mold 1 can be facilitated.

[0023] Example 3

[0024] Based on Example 2, the structure is as follows Figure 3As shown, the sensor group includes a first fiber grating sensor 3 and a second fiber grating sensor 4, the first fiber grating sensor 3 and the second fiber grating sensor 4 are purchased from Shenzhen Aizhijie Technology Co., Ltd., the first fiber grating sensor 3 and the second fiber grating sensor 4 are both arranged on the side wall of the aluminum rod 2 and the first fiber grating sensor 3 and the second fiber grating sensor 4 are both located in the cavity 10, the first fiber grating sensor 3 and the second fiber grating sensor 4 are centrally symmetrically arranged along the axis of the aluminum rod, that is, the first fiber grating sensor 3 and the second fiber grating sensor 4 are arranged one by one and are in the same plane, The basin-type insulator mold 1 is a symmetrical figure with a central axis, so the measured data can be considered as the temperature and stress data of the same point, which improves the accuracy of the data. The first fiber grating sensor 3 is used to obtain the temperature data during the epoxy resin curing process, and the second fiber grating sensor 4 is used to obtain the stress data during the epoxy resin curing process. The first fiber grating sensor 3 and the second fiber grating sensor 4 are both connected to the fiber demodulator 7. By arranging the first fiber grating sensor 3 and the second fiber grating sensor 4 on the side wall of the aluminum rod 2, the temperature and strain changes at the interface with the aluminum rod 2 during the basin-type insulator curing process can be measured.

[0025] The working process of the interface strain measurement system of the pot-type insulator of the utility model is as follows: the first fiber grating sensor 3 and the second fiber grating sensor 4 are arranged on the side wall of the aluminum rod 2, and then the aluminum rod 2 is inserted into the cavity 10 in the pot-type insulator mold 1 through the insertion hole 6, and silicone sealant is injected between the aluminum rod 2 and the insertion hole 6 for sealing, and epoxy resin is injected into the cavity 10 from the gate 5, and the gate 5 is arranged upward to prevent the epoxy resin from flowing out. After the injection is completed, during the curing process of the epoxy resin, the first fiber grating sensor 3 monitors the pot-type insulator mold 1 in real time. The temperature of the epoxy resin at the interface is monitored and uploaded to the host computer through the optical fiber demodulator 7. The temperature field and curing degree field during the curing process are output through the solid heat transfer module in the digital twin model of the basin insulator curing process, and are visualized on the host computer 8. During the epoxy resin curing process, the second fiber grating sensor 4 monitors the strain at the interface of the basin insulator mold 1 in real time and is uploaded to the host computer through the optical fiber demodulator 7. The curing residual stress change at the interface during the curing process is output through the force deformation module in the digital twin model of the basin insulator curing process.

[0026] The above disclosures are only several specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. The interface strain measurement system of pot-type insulator is characterized by: The invention comprises a pot-type insulator mould (1), wherein an aluminium rod (2) is inserted into the pot-type insulator mould (1), a sensor group is arranged on the side wall of the aluminium rod (2), the sensor group is connected to an optical fibre demodulator (7), and the optical fibre demodulator (7) is connected to a host computer.

2. The interface strain measurement system of pot-type insulator according to claim 1, characterized in that: The pot-type insulator mold (1) comprises a shell (9), a cavity (10) is arranged in the shell (9), a gate (5) is arranged on the shell (9), the gate (5) is connected to one end of the cavity (10), a plug hole (6) is arranged at the center of the convex surface of the shell (9), the plug hole (6) is connected to the cavity (10), and an aluminum rod (2) is inserted into the plug hole (6).

3. The interface strain measurement system of pot-type insulator according to claim 2, characterized in that: Silicone sealant is provided between the aluminum rod (2) and the insertion hole (6).

4. The interface strain measurement system of pot-type insulator according to claim 1, characterized in that: The sensor group comprises a first fiber grating sensor (3) and a second fiber grating sensor (4); the first fiber grating sensor (3) and the second fiber grating sensor (4) are both arranged on the side wall of the aluminum rod (2); and the first fiber grating sensor (3) and the second fiber grating sensor (4) are both connected to a fiber demodulator (7).

5. The interface strain measurement system of pot-type insulator according to claim 4, characterized in that: The first fiber grating sensor (3) and the second fiber grating sensor (4) are arranged in a centrally symmetrical manner along the axis of the aluminum rod.

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