Basin-type insulator internally embedded with ultrasonic sensor

Abstract

The utility model relates to a basin-type insulator internally embedded with an ultrasonic sensor. The flange ring and the protective cover are connected together after epoxy resin is poured and cured, and the protective cover is fixed to the flange ring through threaded connection. One end of the outlet box is fixed with the outer edge of the flange ring; the outlet box and the flange ring are fixed through a bolt; an ultra-wave sensor is installed in the protective cover, and a sensor signal is led out by the SMA cable through the cable protective joint. According to the utility model, the problem of difficulty in partial discharge signal measurement and basin-type insulator fault diagnosis in the existing GIS is solved, and since the sensor is installed in the basin-type insulator, the workload of engineering field test and diagnosis is greatly reduced, field fault diagnosis is facilitated, and the device can be used for real-time fault monitoring, thereby improving the working efficiency. And meanwhile, the device has the advantages of good sensitivity and anti-interference performance, simple structure, convenience in maintenance and the like.

Description

Technical Field

[0001] The utility model relates to the technical fields of intelligent high-voltage switch transmission equipment and internal partial discharge monitoring of gas-insulated metal-enclosed switchgear (GIS), and mainly relates to a pot insulator with an internally embedded partial discharge sensor. It is a way of non-destructive testing in the power system. Background Technique

[0002] Compared with conventional open substations, the advantages of gas-insulated metal-enclosed switchgear (hereinafter referred to as: GIS) are its compact structure, small floor area, high reliability, strong safety, very little maintenance work, low operation and maintenance costs, excellent insulation performance, etc. At present, it is widely used in the power transmission and transformation system. With the continuous increase in the construction intensity of the national intelligent power grid, high-voltage equipment is generally required to have intelligent functions. The internal partial discharge detection of GIS is a very important part of intelligent condition monitoring. Partial discharge sensors can be divided into ultrasonic partial discharge sensors, ultra-high frequency UHF partial discharge sensors, etc. at present. At present, the pot insulators with partial discharge sensor functions used in the industry all adopt antenna structures. That is, a conductor is embedded in the pot insulator, and this conductor obtains signals through electromagnetic induction during the operation of GIS, which is likely to generate floating potential and bring great risks to the operation of the equipment. Summary of the Invention

[0003] The purpose of the utility model is to solve the problems existing in the above technology, and propose a pot insulator made by using ultrasonic technology and installed inside the pot insulator through a protective cover. Such a pot insulator not only has the function of partial discharge detection, but also has no floating potential problem.

[0004] The purpose of the utility model is realized through the following technical solutions:

[0005] The pot insulator with an internally embedded ultrasonic sensor includes a flange ring. The flange ring is provided with assembly holes for connecting with a protective cover, and the protective cover is threadedly connected to the flange ring. The protective cover and the flange ring are connected together by cured epoxy resin formed after pouring epoxy resin. The flange ring is also provided with an assembly hole for installing the ultrasonic sensor. This assembly hole communicates with the protective cover, and the ultrasonic sensor is installed in the protective cover and extends out from the end of this assembly hole. The ultrasonic sensor is not connected to the epoxy resin by pouring and curing. A silica gel sleeve is provided at a position outside the assembly hole of the flange ring and is installed at the tail of the ultrasonic sensor to play a sealing role. The outlet box is crimped on the silica gel sleeve and is connected to the flange ring by bolts. One end of the outlet box housing is fixed to the flange ring. A threaded hole is opened on one side of the outlet box for installing a cable protection joint. The structure between the outlet box and the flange ring is detachable. The other end of the cable protection joint is equipped with a silica gel sheath, and the silica gel sheath is clamped with the SMA cable. The outgoing cable of the ultrasonic sensor passes through the silica gel sleeve, the outlet box, the cable protection joint and the silica gel sheath and is led out.

[0006] Preferably, the assembly hole on the inner side of the flange ring is a threaded hole for installing and fixing the protective cover.

[0007] Preferably, a sealing gasket is provided between the flange ring and the protective cover, and the sealing gasket is pressed tightly by screwing the protective cover.

[0008] Preferably, a wire outlet hole is opened in the middle of the silica gel sleeve. The SMA cable passes through and is sleeved on the tail of the ultrasonic sensor and is pressed tightly by the outlet box to play a role in dust prevention and sealing.

[0009] Preferably, threaded mounting holes are opened on the outer side of the flange ring, and the outlet box is installed on the outer side of the flange by bolts.

[0010] Preferably, a threaded hole is made on one side of the outlet box for assembling with the cable protection joint, and the cable protection joint is accompanied by a dust-proof sealing ring from the manufacturer.

[0011] Preferably, the silica gel sheath has a two-lobe symmetric structure, is clamped on both sides of the SMA cable, and is locked by the upper nut on the cable protection joint to fix the cable and play a role in dust prevention and sealing.

[0012] Preferably, the SMA cable is led out through the silica gel sleeve, the junction box, the cable protection joint and the silica gel sheath.

[0013] Preferably, the SMA cable is a 50-ohm coaxial cable, and the connector is of the type marked as SMA male head, which is convenient for connecting with measuring equipment. The SMA cable is led out by using a standard coaxial cable, and the SMA connector is a standard male head.

[0014] The beneficial effects of the present utility model are as follows:

[0015] 1. The protective cover and the sealing gasket can prevent epoxy resin from overflowing into the assembly holes on the flange ring during the pouring and curing of epoxy resin.

[0016] 2. During operation, the protective cover is connected to the flange ring through threads, which can play a protective role, shield the electric field inside the GIS, and ensure the normal operation of the ultrasonic sensor.

[0017] 3. The flange ring is required to be reliably grounded during operation. The protective cover is connected to the flange ring through threads, which will not cause floating points inside the pot insulator and will not affect the normal operation of GIS.

[0018] 4. The ultrasonic sensor is very easy to install. When disassembling and replacing it, you only need to remove the four bolts and the nuts of the cable protection connector.

[0019] 5. Silicone sealing components (sealing pads, silicone sleeves and silicone sheaths) are provided on the inside and outside of the flange ring to ensure that the waterproof and dustproof level of the structure meets the use requirements.

[0020] 6. The ultrasonic sensor is installed inside the basin insulator, which can effectively detect the partial discharge phenomenon inside the GIS and is not affected by the external electromagnetic interference of the GIS. The detection result is more accurate.

[0021] 7. The ultrasonic sensor is installed at the bottom of the pot insulator, which takes up little space and does not affect the layout of the entire GIS.

[0022] 8. The localization of partial discharge signals can be achieved by installing pot-type insulators with ultrasonic sensors embedded inside on both sides of the tank.

[0023] 9. The ultrasonic sensor is installed at the bottom of the pot insulator, which can measure the vibration signal inside the GIS tank and reflect the defects inside the GIS.

[0024] 10. The new type has the characteristics of simple structure, easy manufacturing, high detection sensitivity, strong resistance to external interference, etc., and focuses on solving the technical problems existing in the prior art such as potential suspension, inconvenient on-site testing and installation, and heavy workload. The utility model can be applied to GIS of all voltage levels including ultra-high voltage (1100kV). BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A partial enlarged view of the utility model.

[0026] Figure 2 Schematic diagram of the structure of the utility model. DETAILED DESCRIPTION

[0027] like Figure 1As shown, the pot-type insulator with an ultrasonic sensor embedded therein comprises a flange ring 1, an ultrasonic sensor 2, a protective cover 3, epoxy resin 4, a sealing gasket 5, a silicone sleeve 6, a bolt 7, an outlet box 8, a cable protective connector 9, a silicone sheath 10, and an SMA cable 11.

[0028] The flange ring 1 is provided with threaded holes which are connected to the protective cover 3 by threads, so as to ensure that the protective cover 3 is reliably connected to the flange ring 1 and no floating points are generated during operation, and the electric field interference to the ultrasonic sensor 2 is shielded.

[0029] The sealing gasket 5 is installed between the flange ring 1 and the protective cover 3 to prevent the epoxy resin from overflowing into the assembly hole on the flange ring when pouring the epoxy resin and curing the epoxy resin.

[0030] The flange ring 1 and the protective cover 3 are connected together by curing epoxy resin formed by pouring epoxy resin 4 , and the ultrasonic sensor 2 is installed in the protective cover 3 .

[0031] The silicone sleeve 6 is installed on the outlet end of the ultrasonic sensor 2 to fix the ultrasonic sensor 2 , and the outlet box 8 is crimped onto the silicone sleeve 6 to seal and fix the ultrasonic sensor 2 .

[0032] The outlet box 8 is fixed to the outer side of the flange ring 1 by bolts 7, and a threaded hole is formed on one side of the outlet box 8 for threaded connection with the cable protection connector 9.

[0033] The cable protection connector 9 and the silicone sheath 10 are clamped to seal, and the lead wire of the SMA cable 11 of the ultrasonic sensor 2 is led out through the outlet box 8, the cable protection connector 9 and the silicone sheath 10.

[0034] The manufacturing method of the utility model is as follows: first, install the sealing gasket 5 at the bottom of the inner threaded hole of the flange ring 1, then screw the threaded end of the protective cover 3 into the flange ring, and press the sealing gasket 5 to prevent the epoxy resin from overflowing into the assembly hole on the flange ring when pouring the epoxy resin 4 and curing the epoxy resin. Place the assembled flange ring 1 in the mold, pour the epoxy resin 4 through the pouring hole, and connect the flange ring 1 and the protective cover 3 together after the epoxy resin is cured. After the pot-type insulator is cured, install the ultrasonic sensor 2 in the protective cover 3. The SMA cable 11 is led out through the opening of the silicone sleeve 6 and passes through the outlet box 8. The outlet box 8 presses the silicone sleeve 6 and is fixed to the flange ring 1 with bolts 7. Pass the SMA cable 11 through the cable protection connector 9, and then screw the threaded end of the cable protection connector 9 into one side of the outlet box 8. Finally, clamp the silicone sheath 10 on the SMA cable 11, insert it into the cable protection connector 9 and lock it with a nut. At this point, the pot-type insulator with the ultrasonic sensor embedded inside is assembled. Figure 2 shown.

[0035] Usage method of the utility model: Fix and assemble the flange ring 1 of the pot-shaped insulator with an internally embedded ultrasonic sensor and the GIS tank together through bolts. When partial discharge occurs inside the GIS, an ultrasonic spectrogram with certain waveform characteristics will be generated. The ultrasonic sensor 2 serves as a receiving sensor, and transmits the collected characteristic signals to the measuring device via the SMA cable 11. Finally, the measuring device completes the analysis of the characteristic signals to determine parameters such as the discharge type and discharge location.

Claims

1. A pot-type insulator with an ultrasonic sensor embedded therein, comprising a flange ring (1), characterized in that: The flange ring (1) is provided with an assembly hole for connecting with the protective cover (3), the protective cover (3) and the flange ring (1) are threadedly connected, and the protective cover (3) and the flange ring (1) are cast by pouring epoxy resin (4) to form an integral body; the ultrasonic sensor (2) is installed on the protective cover (3) and the end thereof extends out, the silicone sleeve (6) is installed on the outlet end of the ultrasonic sensor (2) to fix the ultrasonic sensor (2); the outlet box (8) is crimped onto the silicone sleeve (6) and fixed to the flange ring (1) by bolts (7), and one side of the outlet box (8) is connected to the cable protection connector (9); the lead wire of the SMA cable (11) of the ultrasonic sensor (2) is led out through the silicone sleeve (6), the outlet box (8) and the cable protection connector (9).

2. The pot-type insulator with an ultrasonic sensor embedded therein according to claim 1, characterized in that: A sealing gasket (5) is installed between the flange ring (1) and the protective cover (3).

3. The pot-type insulator with an ultrasonic sensor embedded therein according to claim 1, characterized in that: One end of the cable protection connector (9) is threadedly connected to the outlet box (8), and the other end is provided with a silicone sheath (10); the cable protection connector (9) and the silicone sheath (10) are pressed together by a nut of the cable protection connector (9) to complete the sealing of the SMA cable (11).

4. The pot-type insulator with an ultrasonic sensor embedded therein according to claim 1, characterized in that: The ultrasonic sensor (2) is not connected to the epoxy resin (4) by pouring and curing.

5. The pot-type insulator with an ultrasonic sensor embedded therein according to claim 1, characterized in that: The SMA cable (11) is led out using a standard coaxial cable, and the SMA connector is a standard male connector.

6. The pot-type insulator with an ultrasonic sensor embedded therein according to claim 1, characterized in that: The outlet box (8) and the flange ring (1) are detachable structures.

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