Light environment-friendly gas insulation ring main unit

Abstract

The light environment-friendly gas insulation ring main unit is characterized in that a gas equalizing cavity is formed in the top surface of an insulation cavity in an embedded mode, the inner side surface and the bottom surface of the gas equalizing cavity are connected with the insulation cavity in an embedded mode, the outer side surface of the gas equalizing cavity is flush with the outer side surface of the insulation cavity, and a gas distribution pipe is vertically arranged on the outer side of the bottom of the gas equalizing cavity; a gas uniformizing machine and a gas storage tank are arranged in the gas uniformizing cavity, a single-pass filter plate is arranged between the ends, connected with the insulation cavity, of the gas uniformizing cavity, the bottom end of the gas distribution pipe is communicated with the gas storage tank, gas holes are vertically formed in the outer side of the gas distribution pipe, and the distance between the gas holes of the gas distribution pipe is sequentially reduced from top to bottom. The gas uniformizing cavity for uniformizing the light environment-friendly gas is arranged above the original insulating cavity, so that the light environment-friendly gas deposited above the insulating cavity is reused and flows back to the bottom of the insulating cavity through the gas uniformizing cavity, and the light environment-friendly gas can be fully insulated to the whole volume in the insulating cavity.

Description

Technical Field

[0001] This document belongs to the technical field of gas-insulated ring main units, and specifically relates to a lightweight and environmentally friendly gas-insulated ring main unit. Background Art

[0002] In power transmission and distribution lines, a high-voltage ring main unit is an important cabinet, mainly composed of a high-voltage fuse and a load switch. It has the advantages of small volume, simple structure, improved power supply parameters and functions, and safe power supply. Each distribution branch is equipped with a socket switch device. The rated current of the ring network is not large, generally not exceeding 630A. The high-voltage switch in the ring network is usually a load switch for operating normal current, and the fuse cuts off the short-circuit current and combines to replace the circuit breaker. An gas-insulated switchgear is a new generation of switchgear cabinet. The switch can use a permanent magnet mechanism and a spring mechanism circuit breaker. It is a switchgear with gas as the insulating medium. According to the application field, it can be divided into primary power distribution equipment and secondary power distribution equipment. Due to its compact structure and small volume, many ring main units use gas-insulated switchgear, and gas-insulated switchgear can also be called a fully insulated ring main unit. Gas-insulated switchgear is suitable for occasions with high power consumption requirements.

[0003] Since SF6 has high insulation performance and low sensitivity to the electric field, SF6 is widely used in gas-insulated ring main units. When SF6 is used in a ring main unit, a sealed box needs to be set inside the ring main unit. SF6 is located in the sealed box, and the sealed box prevents SF6 from leaking. In order to make SF6 maintain a good insulation effect and arc extinguishing effect, the air pressure in the sealed box is greater than the external air pressure, so the probability of gas leakage from the sealed box is relatively high. When SF6 leaks into the air and mixes with the oxygen in the air and is inhaled into the human body, it will cause symptoms such as numbness in the limbs and mild excitement in the human body. At this time, SF6 generates certain toxicity.

[0004] Therefore, in order to ensure the environmental protection effect of insulation inside the ring main unit, a lightweight and environmentally friendly gas is used to insulate the inside of the ring main unit. However, the lightweight and environmentally friendly gas itself is relatively light, and the insulation cavity inside the ring main unit has a large volume. When filling the insulating gas, due to the limitations of production technology and production cost, it is impossible to ensure that the content of the lightweight and environmentally friendly gas filled inside is 100%. Therefore, when the lightweight and environmentally friendly gas and air are mixed and set inside the insulation cavity, the content of the lightweight and environmentally friendly gas above the insulation cavity will be greater than that below the insulation cavity, and it may even cause stratification between the lightweight and environmentally friendly gas and the air, resulting in the inability to fill the entire area of the insulation cavity with the lightweight and environmentally friendly gas, thus generating potential safety hazards. Summary of the Utility Model

[0005] To solve the above problems, this paper proposes a lightweight and environmentally friendly gas-insulated ring main unit. The ring main unit includes a switch chamber, a wiring chamber, a ventilation chamber, an insulation chamber, and a gas equalizing chamber. The top surface of the insulation chamber is embedded with the gas equalizing chamber. The inner surface and the bottom surface of the gas equalizing chamber are embedded and connected to the insulation chamber. The outer surface of the gas equalizing chamber is flush with the outer surface of the insulation chamber. A gas distribution pipe is vertically provided on the outer bottom of the gas equalizing chamber. An air distributor and a gas storage tank are provided inside the gas equalizing chamber. A one-way filter plate is provided between the ends of the gas equalizing chamber connected to the insulation chamber. The bottom end of the gas distribution pipe is connected to the gas storage tank. Air holes are vertically provided on the outer side of the gas distribution pipe, and the spacing of the air holes of the gas distribution pipe gradually decreases from top to bottom. One side of the one-way filter plate is arranged inside the insulation chamber, and the other side is connected to the air distributor. The outlet of the air distributor is connected to the gas storage tank. By providing a gas equalizing chamber above the original insulation chamber to evenly distribute the lightweight and environmentally friendly gas, the lightweight and environmentally friendly gas deposited above the insulation chamber can be recycled back to the bottom of the insulation chamber, ensuring that the lightweight and environmentally friendly gas can fully insulate the entire volume inside the insulation chamber.

[0006] The shape of the insulation chamber is a rectangular cavity. An assembly connection groove is provided on the left side of the bottom of the insulation chamber. The left side of the insulation chamber is connected to the switch cabinet. The outside of the conduction connection groove of the insulation chamber is connected to the wiring cabinet. The outside of the bottom of the insulation chamber is connected to the ventilation cabinet. A gas conduction connection groove is provided at the upper right corner of the top of the insulation chamber. The outside of the gas conduction connection groove of the insulation chamber is connected to the gas equalizing chamber. The gas equalizing chamber is a rectangular sealed cavity. An air distributor and a gas storage tank are provided on the inner bottom surface of the gas equalizing chamber. The end face of the gas equalizing chamber is semi-embedded in the inner side of the insulation chamber at a certain height. A one-way filter plate is provided on the end face of the gas equalizing chamber embedded inside the insulation chamber. The bottom surface of the gas equalizing chamber is fully attached to the insulation chamber. By semi-embedding the gas equalizing chamber at the upper end of the insulation chamber, while ensuring sufficient usable area inside the insulation chamber, it can also ensure receiving high-concentration lightweight and environmentally friendly gas from above the insulation chamber, facilitating the reception and re-concentration distribution of high-concentration lightweight and environmentally friendly gas.

[0007] The air distributor is a gas concentration output regulator. A gas concentration receiver is provided inside the air distributor. The gas concentration receiver is connected to a gas concentration sensor. The gas concentration sensors are respectively provided inside the gas storage tank, at the upper part, middle part, and lower part of the insulation chamber. The shape of the gas storage tank is a cylindrical storage tank. The inlet of the gas storage tank is connected to the air distributor, and the outlet of the gas storage tank is connected to the gas distribution pipe. An air outlet pump is provided between the gas storage tank and the gas distribution pipe. By means of the air distributor, high-concentration lightweight and environmentally friendly gas can be input into the gas storage tank in batches, and the gas is introduced into the bottom of the insulation chamber through the gas storage tank, ensuring the reasonable distribution of high-concentration lightweight and environmentally friendly gas.

[0008] The shape of the gas distribution pipe is a vertical circular pipe. The top of the gas distribution pipe is connected to the gas storage tank through an air outlet pump. The bottom end of the gas distribution pipe is a sealed end. The outer surface of the side of the gas distribution pipe facing the middle of the insulation cavity is provided with air holes in a through manner. The shape of the air holes is small circular holes. Through the unevenly distributed air holes, the effect of less air outlet at the upper part and more air outlet at the lower part is achieved, which is convenient for evenly distributing the gas reasonably, ensuring the balance of the concentration of the light environmental protection gas inside the insulation cavity and preventing stratification.

[0009] Beneficial effects:

[0010] By arranging an air equalizing cavity for evenly distributing the light environmental protection gas above the original insulation cavity, the light environmental protection gas deposited above the insulation cavity can be recycled back to the bottom of the insulation cavity through the air equalizing cavity, thus ensuring that the light environmental protection gas can fully insulate the entire volume inside the insulation cavity.

[0011] By semi-embeddedly arranging the air equalizing chamber at the upper end of the insulation cavity, while ensuring sufficient usable area inside the insulation cavity, it can also ensure receiving high-concentration light environmental protection gas from above the insulation cavity, which is convenient for receiving and redistributing the concentration of the high-concentration light environmental protection gas.

[0012] Through the air equalizing machine, the high-concentration light environmental protection gas is input into the gas storage tank in batches, and the gas is introduced into the bottom of the insulation cavity through the gas storage tank, thus ensuring the reasonable distribution of the high-concentration light environmental protection gas.

[0013] Through the unevenly distributed air holes, the effect of less air outlet at the upper part and more air outlet at the lower part is achieved, which is convenient for evenly distributing the gas reasonably, ensuring the balance of the concentration of the light environmental protection gas inside the insulation cavity and preventing stratification. Description of the drawings

[0014] Figure 1 It is a schematic internal view of the side of a light environmental protection gas insulated ring main unit;

[0015] Return of lease; 1. Switch chamber, 2. Wiring chamber, 3. Ventilation chamber, 4. Insulation chamber, 5. Air equalizing chamber, 6. Lifting ear, 7. Single-pass filter plate, 8. Air equalizing machine, 9. Gas storage tank, 10. Gas distribution pipe. Detailed implementation manners

[0016] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in combination with embodiments and drawings. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0017] Switch chamber 1, wiring chamber 2, ventilation chamber 3, insulation chamber 4, air equalizing chamber 5, lifting ear 6, single-pass filter plate 7, air equalizing machine 8, gas storage tank 9, gas distribution pipe 10.

[0018] As Figure 1 shown;

[0019] A light environmental protection gas-insulated ring main unit. The ring main unit includes a switch chamber 1, a wiring chamber 2, a ventilation chamber 3, an insulation chamber 4 and a gas equalizing chamber 5. The top surface of the insulation chamber 4 is embedded with the gas equalizing chamber 5. The inner surface and the bottom surface of the gas equalizing chamber 5 are embedded and connected to the insulation chamber 4. The outer surface of the gas equalizing chamber 5 is flush with the outer surface of the insulation chamber 4. Vertically and perpendicularly provided on the outer bottom of the gas equalizing chamber 5 is a gas distribution pipe 10. Inside the gas equalizing chamber 5 are provided a gas homogenizer 8 and a gas storage tank 9. Between the ends of the gas equalizing chamber 5 connected to the insulation chamber 4 is provided a one-way filter plate 7. The bottom end of the gas distribution pipe 10 is connected to the gas storage tank 9. Vertically provided on the outer side of the gas distribution pipe 10 are air holes, and the distance between the air holes of the gas distribution pipe 10 decreases successively from top to bottom. One side of the one-way filter plate 7 is arranged inside the insulation chamber 4, and the other side of the one-way filter plate 7 is connected to the gas homogenizer 8. The outlet of the gas homogenizer 8 is connected to the gas storage tank 9. The shape of the insulation chamber is a rectangular cavity. On the left side of the bottom of the insulation chamber is provided an assembly connection groove. The left side of the insulation chamber is connected to the switch cabinet. The outside of the conduction connection groove of the insulation chamber is connected to the wiring cabinet. The outside of the bottom of the insulation chamber is connected to the ventilation cabinet. At the right top corner of the insulation chamber is provided a gas conduction connection groove, and the outside of the gas conduction connection groove of the insulation chamber is connected to the gas equalizing chamber 5. The gas equalizing chamber 5 is a rectangular sealed cavity. On the inner bottom surface of the gas equalizing chamber are provided a gas homogenizer 8 and a gas storage tank 9. The end face of the gas equalizing chamber is semi-embedded at a height on the inner side of the insulation chamber. On the end face of the gas equalizing chamber embedded inside the insulation chamber is provided a one-way filter plate 7. The bottom surface of the gas equalizing chamber is fully attached and connected to the insulation chamber. The gas homogenizer 8 is a gas concentration output regulator. Inside the gas homogenizer 8 is provided a gas concentration receiver. The gas concentration receiver is connected to a gas concentration sensor. The gas concentration sensors are respectively arranged inside the gas storage tank 9, in the upper part of the insulation chamber 4, in the middle part of the insulation chamber 4 and in the lower part of the insulation chamber 4. The shape of the gas storage tank 9 is a cylindrical storage tank. The inlet of the gas storage tank 9 is connected to the gas homogenizer 8. The outlet of the gas storage tank 9 is connected to the gas distribution pipe 10. Between the gas storage tank 9 and the gas distribution pipe 10 is an air outlet pump. The shape of the gas distribution pipe 10 is a vertical circular pipe. The top end of the gas distribution pipe 10 is connected to the gas storage tank 9 through an air outlet pump. The bottom end of the gas distribution pipe 10 is a sealed end. On the outer surface of the side of the gas distribution pipe 10 facing the middle part of the insulation chamber 4 are provided through air holes. The shape of the air holes is small round holes.

[0020] Implementation example;

[0021] After the ring main unit is assembled and the insulation chamber 4 is filled with the light environmental protection gas and then sealed, the ring main unit is powered on and started. At this time, the gas homogenizer 8 is started simultaneously.

[0022] The gas distributor 8 monitors the concentration of the light environmental protection gas inside the insulating cavity 4 and the gas storage tank 9 in real time. When the concentration of the light environmental protection gas is unstable, the gas distributor 8 is started to absorb and evenly adjust the concentration of the light environmental protection gas above the inside of the insulating cavity 4, and then input it into the gas storage tank 9. Then, it is filled into the inside of the insulating cavity 4 through the air distribution pipe 10, so that the light environmental protection gas inside the insulating cavity 4 is fully distributed.

[0023] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A light environmental protection gas-insulated ring main unit, the ring main unit comprising a switch chamber, a wiring chamber, a ventilation chamber, an insulation chamber and a gas equalizing chamber, characterized in that, An air equalizing chamber is embedded in the top surface of the described insulating cavity. The inner surface and the bottom surface of the air equalizing chamber are embedded and connected to the insulating cavity. The outer surface of the air equalizing chamber is flush with the outer surface of the insulating cavity. A gas distribution pipe is vertically and perpendicularly provided on the outer bottom of the air equalizing chamber. An air equalizer and a gas storage tank are provided inside the air equalizing chamber. A one-way filter plate is provided between the ends where the air equalizing chamber is connected to the insulating cavity. The bottom end of the gas distribution pipe is connected to the gas storage tank. Air holes are vertically provided on the outer side of the gas distribution pipe, and the spacing of the air holes on the gas distribution pipe gradually decreases from top to bottom. One side of the one-way filter plate is arranged inside the insulating cavity, and the other side of the one-way filter plate is connected to the air equalizer. The outlet of the air equalizer is connected to the gas storage tank.

2. The light environmental protection gas-insulated ring main unit according to claim 1, characterized in that, The described insulating cavity is in the shape of a rectangular cavity. An assembly connection groove is provided on the left side of the bottom of the insulating cavity. The left side of the insulating cavity is connected to the switch cabinet. The outside of the conduction connection groove of the insulating cavity is connected to the wiring cabinet. The outside of the bottom of the insulating cavity is connected to the ventilation cabinet. A gas guide connection groove is provided at the upper right corner of the top of the insulating cavity. The outside of the gas guide connection groove of the insulating cavity is connected to the air equalizing chamber.

3. A kind of light environmental protection gas-insulated ring main unit according to claim 1, characterized in that, The described air equalizing chamber is a rectangular sealed cavity. An air equalizer and a gas storage tank are provided on the inner bottom surface of the air equalizing chamber. The end face of the air equalizing chamber is semi-embedded in the inner side of the insulating cavity in terms of height. A one-way filter plate is provided on the end face where the air equalizing chamber is embedded inside the insulating cavity. The bottom surface of the air equalizing chamber is fully attached and connected to the insulating cavity.

4. A light environmental protection gas-insulated ring main unit according to claim 1, characterized in that, The described air equalizer is a gas concentration output regulator. A gas concentration receiver is provided inside the air equalizer. The gas concentration receiver is connected to a gas concentration sensor. The gas concentration sensors are respectively arranged inside the gas storage tank, at the upper part of the insulating cavity, in the middle of the insulating cavity, and at the lower part of the insulating cavity.

5. A lightweight and environmentally friendly gas-insulated ring main unit according to claim 1, characterized in that, The described gas storage tank is in the shape of a cylindrical storage tank. The inlet of the gas storage tank is connected to the air equalizer. The outlet of the gas storage tank is connected to the gas distribution pipe. An air outlet pump is provided between the gas storage tank and the gas distribution pipe.

6. The light environmental protection gas insulated ring main switch cabinet according to claim 1, characterized in that The described gas distribution pipe is in the shape of a vertical circular pipe. The top end of the gas distribution pipe is connected to the gas storage tank through an air outlet pump. The bottom end of the gas distribution pipe is a sealed end. Air holes are provided in a penetrating manner on the outer surface of the side of the gas distribution pipe facing the middle of the insulating cavity. The shape of the air holes is small round holes.

Images