Detachable transformer partial discharge on-line monitoring device

Abstract

The utility model relates to the technical field of transformer partial discharge monitoring, and discloses a detachable transformer partial discharge on-line monitoring device, which comprises a preset flange arranged on a transformer in advance; the sensor mounting base is matched with the preset flange and is detachably connected with the preset flange through a bolt; and the edge position of the bottom of the insulating base extends outwards, and the edge position of the insulating base is arranged between the preset flange and the sensor mounting base. According to the utility model, the preset flange design is adopted, and the standardized preset flange is arranged on the transformer oil tank in advance, so that the transformer put into operation does not need to be subjected to intrusive transformation such as trepanning, welding and the like, the sensor mounting base can be directly adapted, and the mounting complexity and cost are greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer partial discharge monitoring technical field especially relates to a detachable transformer partial discharge on -line monitoring device. BACKGROUND

[0002] In the power system, the transformer as core power transmission and transformation equipment, its insulation state directly influences the safety and reliability of power grid. Partial discharge is the early sign of transformer insulation deterioration, and on -line monitoring can effectively prevent sudden failure.

[0003] At present, the domestic and foreign mainstream transformer partial discharge on -line monitoring system adopts ultra -high frequency (UHF) sensor technology, realizes non -invasive monitoring through the capture of the electromagnetic wave signal generated by discharge. However, the prior art still has the following significant defects in practical application:

[0004] 1, sensor installation mode is limited:

[0005] Traditional flange fixed sensor: need to integrate installation when the transformer leaves factory or carry out large -scale body modification (such as welding flange or opening hole) to the equipment that has been put into operation, lead to high installation cost, long cycle, and possibly damage the sealing property and mechanical strength of the transformer. For the old transformer that has been put into operation, there is the problem of technical risk and economic insufficiency in this kind of modification.

[0006] Oil valve adaptive sensor: although it can be installed through the existing oil valve, but limited by the oil valve position and size, the signal coupling efficiency is low, and it is difficult to adjust or replace after installation, and the maintenance flexibility is poor.

[0007] 2, maintenance and upgrade difficulty:

[0008] Non - detachable structure: the traditional sensor is fixed with the transformer body, once the fault occurs or needs technical upgrade (such as replacing the anti -interference module), must be deenergized and removed, affect the continuous operation of power equipment, increase the operation and maintenance cost.

[0009] Compatibility is insufficient: the existing sensor design is mostly single type for a specific transformer, it is difficult to adapt to the diversification demand of different voltage grades or installation environment, leading to limited system expansion. INVENTION CONTENTS

[0010] The utility model aims at solving the problems in the prior art and proposes a detachable transformer partial discharge on -line monitoring device.

[0011] In order to realize the above -mentioned purpose, the utility model adopts the following technical scheme:

[0012] A detachable transformer partial discharge on -line monitoring device, comprising:

[0013] The preset flange is provided on the transformer in advance;

[0014] The sensor mounting base is detachably connected with the preset flange through bolts.

[0015] The insulating base has an outwardly extended bottom edge and is arranged between the preset flange and the sensor mounting base.

[0016] The partial discharge monitoring sensor comprises an induction antenna arranged in the insulating base and a signal transmission cable electrically connected with the induction antenna and penetrating through the sensor mounting base to the outside and electrically connected with a monitoring host.

[0017] Preferably, a first accommodating groove is formed in one side of the sensor mounting base, the insulating base is arranged in the first accommodating groove, and a first sealing member is arranged between the insulating base and the first accommodating groove.

[0018] Preferably, a second accommodating groove is formed in one side of the sensor mounting base, and a placing groove is formed in one side of the insulating base close to the sensor mounting base, a pad is movably arranged in the placing groove, a bolt is movably arranged through the pad, one end of the bolt is movably arranged through the insulating base and screw-connected with the inner wall of the first accommodating groove, and the end of the bolt is arranged in the second accommodating groove.

[0019] Preferably, a mounting seat in the shape of a "convex" character is sleeved on the outside of the induction antenna, the mounting seat is installed on one side of the sensor mounting base through bolts, and the mounting seat is sealed with the sensor mounting base through a fourth sealing member.

[0020] Preferably, a box is arranged on one side of the sensor mounting base away from the preset flange, a box door is arranged on the surface of the box, a third sealing member is arranged between the box and the sensor mounting base, a hose is arranged on the bottom side of the box, and the signal transmission cable is connected with the monitoring host through the hose.

[0021] Preferably, the hose comprises a work-type connecting piece arranged on the bottom of the box and penetrating through the bottom of the box, a hose body fixedly penetrating through the work-type connecting piece, and a spiral winding pipe wound on the outside of the hose body.

[0022] Preferably, the work-type connecting piece comprises a first clamping ring fixedly installed on the outside of the hose body and abutting against the bottom of the box, and a second clamping ring screw-connected on the outside of the hose body through threads and abutting against the bottom of the inner cavity of the box, and the first clamping ring and the second clamping ring abut against the box through sealing pads.

[0023] Preferably, the hose body is integrally formed by a silica gel material, and the spiral winding pipe is integrally formed by a copper or aluminum material.

[0024] Preferably, the first seal, the second seal, the third seal and the fourth seal are all O-shaped rubber sealing rings.

[0025] Compared with the prior art, the utility model has the beneficial effects that:

[0026] The utility model discloses a preset flange design, which sets a standardized preset flange on the transformer oil tank in advance, without invasive modification such as hole opening and welding on the transformer in operation, can directly adapt to the sensor mounting base, greatly reduces the installation complexity and cost, and is suitable for integrated preloading of new factory transformers and flexible adaptation to the modification demand of old transformers, breaking through the limitation of traditional fixed sensors on installation conditions.

[0027] And the sensor mounting base and the preset flange are fastened by bolts, supporting quick installation and disassembly, suitable for integrated preloading of new factory transformers and flexible adaptation to the modification demand of old transformers, breaking through the limitation of traditional fixed sensors on installation conditions.

[0028] In addition, the partial discharge monitoring sensor realizes modular packaging through the insulating base and the mounting base, when the sensor fails or needs technical upgrading, only needs to disassemble the bolt to replace the sensor module, without power-off or disassembly of the transformer body, greatly shortens the maintenance period and reduces the operation and maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A composition schematic view of the detachable transformer partial discharge online monitoring device is provided for the utility model;

[0030] Figure 2 A box body schematic view of the detachable transformer partial discharge online monitoring device is provided for the utility model.

[0031] In the figure: 1, preset flange;2, sensor mounting base;3, insulating base;4, induction antenna;5, second clamping ring;6, first containing groove;7, second containing groove;8, first seal;9, second seal;10, third seal;11, fourth seal;12, placing groove;13, cushion block;14, mounting seat;15, box body;16, box door;17, hose body;18, spiral winding pipe;19, first clamping ring. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0033] Referring to Figure 1 and Figure 2A detachable transformer partial discharge on-line monitoring device, comprising:

[0034] A preset flange 1 is provided on the transformer;

[0035] A sensor mounting base 2 is matched with the preset flange 1 and detachably connected with the preset flange 1 through bolts;

[0036] An insulating base 3 has its bottom edge extended outward in the radial direction and has its edge position arranged between the preset flange 1 and the sensor mounting base 2;

[0037] A partial discharge monitoring sensor includes an induction antenna 4 arranged inside the insulating base 3 and a signal transmission cable electrically connected with the induction antenna 4 and penetrating through the sensor mounting base 2 to be electrically connected with a monitoring host. When partial discharge occurs, the energy at the insulation defect is instantaneously released to generate a UHF electromagnetic wave pulse with a frequency spectrum ranging from 300 MHz to 3000 MHz. The induction antenna 4 (a flat coupler or a spiral antenna in this embodiment) serves as a wideband electromagnetic wave receiver to capture the UHF signal generated by the discharge through resonance or electric field coupling and convert it into a weak electric signal (μV-mV level). The signal transmission cable transmits the converted electric signal to the monitoring host. The monitoring host digitizes and analyzes the signal to realize on-line monitoring of the transformer partial discharge.

[0038] The insulating base 3 is made of silicone rubber, and the antenna is built-in the silicone rubber insulating base 3 to block the electromagnetic shielding effect of the signal by the metal parts of the transformer body and reduce external interference.

[0039] As a preferred example of the present application, the monitoring host includes:

[0040] A data acquisition module receives original signals (analog / digital signals) from the UHF partial discharge sensor;

[0041] A signal processing module is connected with the signal output end of the data acquisition module to digitize and analyze the original signals;

[0042] A data storage module is connected with the signal output end of the signal processing module to store monitoring data and analysis results;

[0043] A communication module is connected with the signal output end of the signal processing module and the signal input end of a remote host station to realize data interaction between the monitoring host, the remote host station, the sensor and terminal equipment;

[0044] The monitoring host how to collect sensor signals and process them is not described in detail here.

[0045] Compared with the prior art, the detachable transformer partial discharge online monitoring device provided by the application has the advantages that:

[0046] The preset flange 1 is designed by setting a standardized preset flange 1 on the transformer oil tank in advance, without the need for invasive modification such as opening and welding on the transformer in operation, the sensor mounting base 2 can be directly adapted, and the installation complexity and cost are greatly reduced.

[0047] The sensor mounting base 2 and the preset flange 1 are fastened by bolts, supporting quick installation and disassembly, which is suitable for integrated pre-installation of new transformers and flexible adaptation to the modification needs of old transformers, breaking through the limitation of traditional fixed sensors on installation conditions.

[0048] In addition, the partial discharge monitoring sensor provided by the application is modularly packaged through the insulation base 3 and the mounting base, when the sensor fails or needs technical upgrading, only the bolts need to be disassembled to replace the sensor module, without the need for power-off or disassembly of the transformer body, greatly shortening the maintenance cycle and reducing the operation and maintenance cost.

[0049] In the embodiment, the first accommodating groove 6 is formed on one side of the sensor mounting base 2, the edge position of the insulation base 3 is arranged in the first accommodating groove 6, and the first sealing piece 8 is arranged between the insulation base 3 and the first accommodating groove 6, and the second sealing piece 9 is arranged between the preset flange 1 and the sensor mounting base 2. By arranging the sealing pieces between the preset flange 1 and the insulation base 3 and between the preset flange 1 and the sensor mounting base 2, a multi-stage sealing barrier is formed, which greatly improves the sealing performance of the device, effectively isolates the influence of external adverse factors on the sensor, ensures the performance and service life of the sensor, and ensures the accuracy and stability of the monitoring data.

[0050] In the embodiment, the sensor mounting base 2 is attached to the pre-flange 1, and a second accommodating groove 7 is formed on one side of the pre-flange 1. The insulating base 3 is provided with a placing groove 12 on the side close to the sensor mounting base, and a spacer 13 is movably arranged in the placing groove 12. A bolt is movably arranged through the spacer 13, and one end of the bolt is movably arranged through the insulating base 3 and is screw-connected with the inner wall of the first accommodating groove 6. The end of the bolt is arranged in the second accommodating groove 7. In the example of the application, the bolt is arranged through the spacer 13 and the insulating base 3, and is screw-connected with the inner wall of the first accommodating groove 6. The end of the bolt is arranged in the second accommodating groove 7. When the bolt is tightened, the insulating base 3 is tightly fixed on the pre-flange under the action of the screw force. At the same time, the spacer 13 plays a supporting and buffering role in the placing groove 12. The tight connection between the insulating base 3 and the pre-flange 1 is ensured, and the mechanical stress is dispersed through the spacer 13, so that the whole structure is more stable. During the operation of the transformer, even if vibration occurs, the problem of loose connection can be effectively reduced, and the partial discharge monitoring sensor can always maintain a good working state.

[0051] In the embodiment, the inductive antenna 4 is provided with a mounting seat 14 in the shape of a "convex" character on the outside, and the mounting seat 14 is screw-connected on one side of the sensor mounting base 2 and is sealed with the sensor mounting base 2 by the fourth sealing member 11. In the example of the application, the mounting seat 14 in the shape of a "convex" character is arranged on the outside of the inductive antenna 4, and is screw-connected and sealed by the fourth sealing member 11. The installation stability and sealing performance of the inductive antenna 4 are greatly improved, the inductive antenna 4 can be effectively protected from external factors, and the service life is prolonged.

[0052] In the embodiment, the sensor mounting base 2 is provided with a box body 15 away from the pre-flange 1. The surface of the box body 15 is provided with a box door 16. The box door 16 is screw-connected on the side of the box body 15 with an opening, and the box door 16 is sealed with the box body 15 by a sealing gasket (for example, a sealing layer is arranged on the inside of the box door 16, and the screw connecting the box door 16 with the box body 15 is abutted with the box body 15 by the sealing gasket). The third sealing member 10 is arranged between the box body 15 and the sensor mounting base 2. The bottom side of the box body 15 is provided with a hose, and the signal transmission cable is connected with the monitoring host through the hose.

[0053] The first sealing element 8, the second sealing element 9, the third sealing element 10, and the fourth sealing element 11 all adopt O-ring rubber seals. The first sealing element 8, the second sealing element 9, the third sealing element 10, and the fourth sealing element 11 cover key interfaces such as the pre-set flange 1 and the sensor mounting base 2 (first sealing element 8, second sealing element 9), the housing 15 and the mounting base (third sealing element 10), and the mounting base 14 and the insulating base 3 (fourth sealing element 11), forming a multi-level sealing barrier to effectively isolate moisture, oil and dust from intrusion and meet the long-term operation requirements of high humidity (≤95%) and oily environments.

[0054] In addition, by embedding the edge of the insulating base 3 into the first receiving groove 6 of the pre-installed flange 1, and setting the pad 13 and bolts in the second receiving groove 7 of the sensor mounting base 2, a double limiting structure is formed, which further disperses mechanical stress and reduces the loosening of the connection caused by long-term vibration.

[0055] In this embodiment, the hose includes an I-shaped connector disposed at the bottom of the housing 15 and penetrating the bottom of the housing 15, a hose body 17 fixedly penetrating the I-shaped connector, and a spiral wound tube 18 wound around the outside of the hose body 17.

[0056] The I-shaped connector includes a first clamping ring 19 fixedly installed on the outside of the hose body 17 and abutting against the bottom of the box 15, and a second clamping ring 5 threadedly connected to the outside of the hose body 17 and abutting against the bottom of the inner cavity of the box 15. The first clamping ring 19 and the second clamping ring 5 abut against the box 15 through sealing gaskets.

[0057] The hose body 17 is integrally molded from silicone material, and the spiral wound tube 18 is integrally molded from copper or aluminum material.

[0058] Through the above structural design, the spiral wound tube 18 on the outside of the hose body 17 is made of copper or aluminum to form a Faraday cage effect, shielding external electromagnetic interference (such as switch operation pulses and carrier communication noise) and protecting the integrity of the signal transmission cable.

[0059] The silicone hose body 17 combines temperature resistance (-60℃~200℃) with flexibility, adapting to transformer vibration and thermal expansion and contraction, and preventing cable damage due to mechanical friction or bending;

[0060] The first clamping ring 19 and the second clamping ring 5 are connected by threads and pressurized, and together with the sealing gasket, they ensure that the hose does not loosen or fall off under vibration, and can also keep the housing 15 sealed.

[0061] The detachable transformer partial discharge online monitoring device disclosed by the application realizes non-invasive installation of sensors by prepositioning a standardized flange on a transformer oil tank, and effectively solves the problems of large-scale reconstruction, high cost and damage to the sealing property and mechanical strength of equipment in the installation, maintenance and upgrading process of traditional fixed sensors, breaks through the technical and economic bottleneck in the reconstruction of old transformers, realizes quick replacement and upgrading of sensor modules, optimizes the expansibility and compatibility of the system, greatly reduces the installation and operation and maintenance costs, shortens the maintenance cycle, and greatly improves the adaptability and reliability of the transformer partial discharge online monitoring system while ensuring the safe and stable operation of the power grid.

[0062] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A detachable partial discharge on-line monitoring device for transformers, characterized in that: The utility model relates to a transformer partial discharge monitoring sensor, which comprises a preset flange, a sensor mounting base, an insulating base, a partial discharge monitoring sensor, and a signal transmission cable. The preset flange is provided with a first accommodating groove on one side thereof, and the insulating base is arranged in the first accommodating groove. The sensor mounting base is provided with a second accommodating groove on one side thereof, and the insulating base is provided with a placing groove on one side thereof. A mounting seat in the shape of a "convex" character is arranged on the outer side of the inductive antenna, and the mounting seat is mounted on one side of the sensor mounting base through a bolt and is sealed with the sensor mounting base through a fourth sealing member. A box is arranged on the side of the sensor mounting base away from the preset flange, and a box door is arranged on the surface of the box.

2. The detachable partial discharge on-line monitoring device of a transformer according to claim 1, characterized in that: The box is provided with a third sealing member between the box and the sensor mounting base.

3. A removable partial transformer partial discharge on-line monitoring device according to claim 2, characterized in that: The bottom side of the box is provided with a hose, and the signal transmission cable is connected to the monitoring host through the hose.

4. A removable partial denture according to claim 3, wherein: The hose comprises a I-shaped connecting piece arranged on the bottom of the box and penetrating through the bottom of the box, a hose main body fixedly penetrating through the I-shaped connecting piece, and a spiral winding pipe wound on the outer side of the hose main body.

5. A removable partial transformer partial discharge on-line monitoring device according to claim 4, characterized in that: The I-shaped connecting piece comprises a first clamping ring fixedly mounted on the outer side of the hose main body and abutting against the bottom of the box, and a second clamping ring threadedly screwed on the outer side of the hose main body and abutting against the bottom of the inner cavity of the box.

6. A removable partial transformer partial discharge on-line monitoring device according to claim 5, characterized in that: The first clamping ring and the second clamping ring abut against the box through sealing pads.

7. A removable partial transformer partial discharge on-line monitoring device according to claim 6, characterized in that: The hose main body is integrally formed of silica gel material, and the spiral winding pipe is integrally formed of copper or aluminum material.

8. A removable partial transformer partial discharge on-line monitoring device according to claim 7, characterized in that: The first sealing member, the second sealing member, the third sealing member, and the fourth sealing member are all O-shaped rubber sealing rings.

9. A removable partial transformer partial discharge on-line monitoring device according to claim 8, characterized in that: ​

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