CN207440130U - A kind of halo-free support device pressure-resistant for extra-high voltage transformer shelf depreciation - Google Patents

Abstract

The utility model discloses a halo-free supporting device for partial discharge withstand voltage of UHV transformers, which comprises: a fixed base, a telescopic insulating support rod is installed on the fixed base, and a U type bracket; the bottom of the fixed base is equipped with a sliding wheel, the outer surface of the sliding wheel is equipped with an electromagnet, the electromagnet is connected with the electromagnet switch, the electromagnet switch is connected with the microprocessor, and the microprocessor The processor is also connected to the wireless communication module and the driving module respectively, the wireless communication module is connected to the remote controller, and the driving module is connected to the sliding wheel. The halo-free support device is used to fix the position of the pressurized line in the induction withstand voltage test, and improves the anti-interference ability of the withstand voltage system.

Description

A corona-free support device for partial discharge withstand voltage of UHV transformer

technical field

The utility model belongs to the field of partial discharge withstand voltage, in particular to a corona-free supporting device for partial discharge withstand voltage of an ultra-high voltage transformer.

Background technique

The UHV power grid refers to a modern large-scale structure with a layered, partitioned, and clear structure, which uses the 1000kV transmission network as the backbone grid, and consists of an EHV transmission network, a high-voltage transmission network, and UHVDC, HVDC, and distribution networks. power grid. UHV transformer is an important part of power conversion, and its safe and stable operation is very important to ensure the stability of the system. Once a failure occurs, it will not only lead to a large-scale power outage and threaten the safety of the power grid, but also consume a lot of manpower and material resources and cause heavy losses. Therefore, before putting into operation, it is necessary to strictly examine the insulation and mechanical performance of UHV transformers.

Partial discharge detection is an effective method to grasp the internal operation status of transformers and discover potential insulation defects in time. Partial discharge detection can also classify and identify internal defects, which is helpful for on-site analysis of accidental transformers. As an important part of transformer field handover test, the externally induced induction withstand voltage test with partial discharge measurement can effectively evaluate the insulation damage problems that may be caused by equipment manufacturing, transportation, installation, etc., so it has always been attached great importance to by power units.

When conducting a withstand voltage test with partial discharge measurement on a 1000kV UHV transformer on site, due to the high level of assessment voltage (the induced voltage on the high voltage side reaches 1000kV), it is very easy to introduce external corona discharge interference into the entire withstand voltage system, which affects the The detection of partial discharge inside the transformer leads to misjudgment. For this reason, when arranging the test system circuit, it is necessary to ensure that there is sufficient insulation distance between it and the surrounding conductors. Especially on the top platform of the transformer, in order to keep the distance from the top of the transformer and the oil passage connecting pipe, etc., a plurality of insulating rods are usually threaded and hard-connected, and the pressure wires are bound and fixed on the top of the insulating rods with insulating tape. , the bottom end is also bound and fixed.

The defective that above-mentioned method produces is:

(1) On the one hand, the rigid connection between multiple insulating rods is a metal joint, which requires grounding and shielding measures. Even so, corona interference is easily introduced here, resulting in large errors in partial discharge measurement;

(2) On the other hand, the top of the insulating rod is relatively high from the ground, and a ladder is needed to assist in the fixing process, and the binding position needs to be tried many times to avoid a large sag, which is not only time-consuming and laborious, but also introduces the danger of working at heights; Or, in order to prevent corona from the pressurized circuit, the pressurized wire often uses an aluminum foil wire with a diameter of 20cm, which is easy to form sharp corners when it is bound and fixed on the top of the insulating rod, resulting in extremely uneven local electric field, corona, and partial discharge. There is a large error in measurement.

(3) In addition, since the direction of the corona-free support device needs to be adjusted according to the actual line direction during the partial discharge withstand voltage test of the transformer, and manual adjustment is required, on the one hand, the adjustment is inaccurate, and it takes a lot of time to adjust. Reduced regulation efficiency.

Utility model content

In order to solve the deficiencies of the prior art, the utility model provides a corona-free support device for the partial discharge withstand voltage of UHV transformers, which is used to fix the position of the pressure line in the induction withstand voltage test and improve the withstand voltage system Anti-interference ability.

A corona-free support device for UHV transformer partial discharge withstand voltage of the utility model, comprising:

A fixed base, a retractable insulating support rod is installed on the fixed base, a U-shaped bracket is installed on the scalable insulating support rod; a sliding wheel is installed on the bottom of the fixed base, and a sliding wheel is installed on the outer surface of the sliding wheel. An electromagnet, the electromagnet is connected to an electromagnet switch, the electromagnet switch is connected to a microprocessor, and the microprocessor is also connected to a wireless communication module and a drive module respectively, and the wireless communication module is connected to a remote controller, The driving module is connected with the sliding wheel.

Further, the size of the opening of the U-shaped bracket is adjustable.

Wherein, the opening size of the U-shaped bracket can be adjusted according to the size of the outer diameter of the anti-corona wire, so that the wire can be easily inserted.

Further, the U-bracket is connected to a U-bracket opening size adjustment switch, and the U-bracket opening size adjustment switch is connected to a microprocessor.

Wherein, the U-shaped bracket opening size adjustment switch is arranged on the U-shaped bracket, the U-shaped bracket opening size adjustment switch is connected with the microprocessor through a cable, and the microprocessor is used to control the U-shaped bracket opening size adjustment switch. On and off, and then control the opening size of the U-shaped bracket, so that no tip will be generated during the support process, resulting in corona discharge.

Further, elastic belt binding grooves are provided on the outer top of the U-shaped bracket.

Wherein, the utility model can adopt the elastic band to tighten and fix the anti-corona wire, which is convenient and reliable.

Further, the telescopic insulating support rod is fixedly connected to the U-shaped bracket through a nylon sleeve.

Further, the wireless communication module is an infrared remote control communication module.

Further, the fixed base is fixedly connected to the telescopic insulating support rod through insulating rod fastening bolts.

Further, the electromagnet switch is a rotary switch.

Further, both the microprocessor and the wireless communication module are connected to a power supply module, and the power supply module includes a main power supply and a backup power supply.

Further, the main power supply is a lithium battery, and the backup power supply is a solar battery.

Compared with the prior art, the beneficial effects of the utility model are:

(1) The corona-free support device of the utility model is composed of a U-shaped bracket, a retractable insulating rod and a fixed base, which can ensure the insulation distance without introducing corona interference, and can adjust the length of the rod according to actual needs , Avoid high-altitude operations, easy to fix, and greatly improve work efficiency.

(2) The corona-free supporting device of the utility model is simple and convenient to use, improves test efficiency; has no corona interference, avoids misjudgment caused by measurement errors, and improves the accuracy of test results.

(3) The rod body of the halo-free support device of the present invention is telescopic to avoid the danger of high-altitude operations.

(4) The insulating support rod and the base of the halo-free support device of the present utility model are fixed by a screw rod and can be rotated arbitrarily, and the height of the rod body can be adjusted arbitrarily to meet the needs of adjusting the direction and height according to the needs of the actual line, and the flexibility is strong.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute improper limitations to the present application.

Fig. 1 is a structural schematic diagram of a corona-free support device for UHV transformer partial discharge withstand voltage of the present invention.

Among them, 1. fixed base; 2. telescopic insulating support rod; 3. U-shaped bracket; 4. sliding wheel; 5. nylon sleeve; 6. elastic band binding groove.

Detailed ways

It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

Fig. 1 is a structural schematic diagram of a corona-free support device for UHV transformer partial discharge withstand voltage of the present invention.

As shown in Figure 1, a corona-free support device for UHV transformer partial discharge withstand voltage of the present invention includes:

A fixed base 1, a telescopic insulating support rod 2 is installed on the fixed base 1, a U-shaped bracket 3 is installed on the scalable insulating support rod 2; a sliding wheel 4 is installed on the bottom of the fixed base 1, so that The outer surface of the sliding wheel 4 is equipped with an electromagnet, the electromagnet is connected with the electromagnet switch, the electromagnet switch is connected with the microprocessor, and the microprocessor is also connected with the wireless communication module and the drive module respectively, and the The wireless communication module is connected with the remote controller, and the driving module is connected with the sliding wheel.

Because in the partial discharge withstand voltage test of the transformer, the direction of the corona-free support device needs to be adjusted according to the actual line direction, and manual adjustment is required, on the one hand, the adjustment is inaccurate, and it takes a lot of time to adjust, which reduces the adjustment efficiency. In order to solve this problem, the utility model uses the remote controller to communicate with the microprocessor, and then achieves the control of the on-off of the electromagnet switch and the working state of the drive module, and finally achieves the purpose of accurately adjusting the position of the non-halo supporting device.

Wherein, the microprocessor can be implemented by a single-chip microcomputer or an ARM processor, and its specific model can be selected according to actual needs.

The driving module can be realized by using a micro-generator.

In addition to micro-generators, other drive mechanisms can also be used to achieve this.

Among them, the shape of the fixed base 1 can be in various forms, such as Y-shaped outriggers, and there is an electromagnet at the bottom of each outrigger. By controlling the electromagnet switch, the fixing and removal on the transformer top platform can be realized. Flexible and convenient. The insulating support rod and the fixed base are fixed by screws and can be rotated arbitrarily to adjust the direction according to the actual line direction.

It should be noted that, in addition to the Y-shaped legs, the fixed base can also be a disc structure.

In a specific implementation, the insulating support rod 2 is made of high-strength insulating material, so as to avoid corona interference introduced during the partial discharge measurement process.

The telescopic insulating support rod 2 is fixedly connected with the U-shaped bracket 3 through the nylon sleeve 5, and the height can be adjusted according to the work needs, which can conveniently and reliably select the required support points, and greatly avoids the danger of working at heights.

Wherein, the size of the opening of the U-shaped bracket 3 is adjustable.

The opening size of the U-shaped bracket can be adjusted according to the size of the outer diameter of the anti-corona wire, so that the wire can be easily put in.

In a specific implementation, the U-shaped bracket is connected with a U-shaped bracket opening size adjustment switch, and the U-shaped bracket opening size adjustment switch is connected with a microprocessor.

Wherein, the U-shaped bracket opening size adjustment switch is arranged on the U-shaped bracket, the U-shaped bracket opening size adjustment switch is connected with the microprocessor through a cable, and the microprocessor is used to control the U-shaped bracket opening size adjustment switch. On and off, and then control the opening size of the U-shaped bracket, so that no tip will be generated during the support process, resulting in corona discharge.

In a specific implementation, an elastic band binding groove 6 is provided on the outside of the top of the U-shaped bracket 3 .

Wherein, the utility model can adopt the elastic band to tighten and fix the anti-corona wire, which is convenient and reliable.

In a specific implementation, the wireless communication module is an infrared remote control communication module.

In a specific implementation, the fixed base is fixedly connected to the telescopic insulating support rod through fastening bolts of the insulating rod.

In a specific implementation, the electromagnet switch is a rotary switch.

In this way, the manual adjustment of the on-off of the electromagnet switch can be realized.

In a specific implementation, both the microprocessor and the wireless communication module are connected to a power supply module, and the power supply module includes a main power supply and a backup power supply.

Wherein, the main power supply is a lithium battery, and the backup power supply is a solar battery.

The working principle of the corona-free supporting device for UHV transformer partial discharge withstand voltage of the utility model is as follows:

When carrying out the withstand voltage test of the transformer with partial discharge measurement in an UHV station, the test personnel firstly select the supporting position of the insulating rod according to the requirement of sufficient insulation distance between the test pressurized anti-corona wire and the surrounding main transformer body and accessories. That is, the place where the base is placed. After confirming that it is correct, use the remote control to turn on the magnet switch of the base, so that the base is firmly fixed on the platform of the transformer box; then insert the bottom end of the insulating rod into the support sleeve of the fixed base, and tighten the fastening bolts to ensure insulation The integrity of the rod and the base is connected; then insert the anti-corona wire into the U-shaped bracket, adjust the fixed position and use the elastic belt to further fix it through the groove; then adjust the height of the insulating rod in time according to the length of the anti-corona wire.

The whole preparation process does not require testers to work on heights, and the operation is simple and convenient, and the whole set of devices above the base is made of insulating materials, which can effectively avoid the influence of external corona interference on internal partial discharge measurement, and eliminate the need for support during partial discharge measurement. Corona interference, avoiding high-altitude operations, convenient and reliable fixing, greatly improving work efficiency.

The corona-free supporting device of the utility model is composed of a U-shaped bracket, a retractable insulating rod and a fixed base, which can ensure the insulation distance without introducing corona interference, and can adjust the length of the rod body according to actual needs to avoid high-altitude Easy to operate and fix, greatly improving work efficiency.

The corona-free supporting device of the utility model is simple and convenient to use, improves test efficiency; has no corona interference, avoids misjudgment caused by measurement errors, and improves the accuracy of test results.

The rod body of the halo-free supporting device of the utility model is scalable, which avoids the danger of high-altitude operations.

The insulating support rod and the base of the halo-free support device of the utility model are fixed by a screw rod, which can be rotated arbitrarily, and the height of the rod body can be adjusted arbitrarily, which meets the needs of adjusting the direction and height according to the actual line, and has strong flexibility.

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model.

Claims (10)

1. A corona-free support device for partial discharge withstand voltage of UHV transformer, characterized in that, comprising: A fixed base, a retractable insulating support rod is installed on the fixed base, a U-shaped bracket is installed on the scalable insulating support rod; a sliding wheel is installed on the bottom of the fixed base, and a sliding wheel is installed on the outer surface of the sliding wheel. An electromagnet, the electromagnet is connected to an electromagnet switch, the electromagnet switch is connected to a microprocessor, and the microprocessor is also connected to a wireless communication module and a drive module respectively, and the wireless communication module is connected to a remote controller, The driving module is connected with the sliding wheel. 2 . The corona-free support device for partial discharge withstand voltage of UHV transformer according to claim 1 , wherein the size of the opening of the U-shaped bracket is adjustable. 3 . 3. The halo-free support device for partial discharge withstand voltage of UHV transformers as claimed in claim 2, wherein the U-shaped bracket is connected to the U-shaped bracket opening size adjustment switch, and the U-shaped bracket The frame opening size adjustment switch is connected with the microprocessor. 4. The corona-free support device for partial discharge withstand voltage of UHV transformer according to claim 1, characterized in that, elastic belt binding grooves are provided on the outside of the top of the U-shaped bracket. 5 . The corona-free support device for partial discharge withstand voltage of UHV transformer according to claim 1 , wherein the flexible insulating support rod is fixedly connected to the U-shaped bracket through a nylon sleeve. 6 . 6. The corona-free support device for partial discharge withstand voltage of UHV transformer according to claim 1, characterized in that, the wireless communication module is an infrared remote control communication module. 7. The corona-free support device for partial discharge withstand voltage of UHV transformer according to claim 1, characterized in that, the fixed base is fixedly connected to the telescopic insulating support rod through fastening bolts of the insulating rod. 8. The corona-free supporting device for partial discharge withstand voltage of UHV transformer according to claim 1, characterized in that, the electromagnet switch is a rotary switch. 9. The corona-free supporting device for partial discharge withstand voltage of UHV transformer as claimed in claim 1, wherein said microprocessor and wireless communication module are all connected to a power module, and said power module includes a main power supply and backup power. 10 . The corona-free supporting device for partial discharge withstand voltage of UHV transformers according to claim 9 , wherein the main power supply is a lithium battery, and the backup power supply is a solar battery. 11 .