CN102916362B - A kind of Intelligent inflatable high-voltage vacuum switch cabinet for metros - Google Patents

Abstract

An intelligent inflatable high-voltage vacuum switchgear for subways, which includes a low-voltage chamber, an upper mechanism operating room, a lower mechanism operating room, a lower maintenance room, a lower pressure relief room, a main busbar inflatable room, a cable installation room, and a vacuum circuit breaker inflatable room , Rear pressure relief chamber, its main feature is that the main conductive circuit of the high-voltage vacuum switchgear is sealed in the main busbar inflatable chamber and the circuit breaker inflatable chamber, a three-position isolation/grounding switch is installed in the two inflatable chambers, and the main busbar The plenum chamber and the circuit breaker plenum chamber are electrically connected by an intermediate connector. In the state of maintenance or power failure, the two three-position isolation/grounding switches in the present invention can be grounded, which effectively guarantees the safety of maintenance personnel during maintenance. When a large fault occurs in the circuit breaker room and cannot be repaired on site, the three-position isolating/grounding switch in the main busbar room can be separated, the related connectors can be removed, the vacuum circuit breaker gas chamber can be drawn out, and the spare compartment can be replaced to quickly restore the power supply and overcome the problem. In the past, single-chamber switchgear cannot be maintained on site and has fatal defects such as long power failure time.

Description

An intelligent inflatable high-voltage vacuum switch cabinet for subway

technical field

The invention relates to a solid insulation high-voltage vacuum switchgear, in particular to an intelligent inflatable (C-GIS) high-voltage vacuum switchgear for subways.

Background technique

Medium-voltage gas-insulated metal-enclosed switchgear is a high-tech complete power distribution device newly developed internationally in the 1990s. With the design goals of modularization, multi-functional combination, high reliability and compact structure, it has created a technological, The outstanding economic achievements represent the development direction and world advanced level of contemporary medium voltage switchgear. It expands the conventional GIS technology to the medium voltage field, and uses low pressure SF6 gas or SF6 and N: mixed gas as the insulating medium. Combining GIS technology with switchgear technology to form a new complete set of serialized products called gas-insulated metal-enclosed switchgear, and its small size, anti-pollution quickly recognized by the majority of users, especially suitable for high reliability requirements and underground In places with relatively harsh natural environments and conditions such as mountains, plateaus, and coastal areas, the application is becoming more and more extensive. However, at present: the manufacturers who have launched the inflatable (C-GIS) vacuum circuit breaker cabinet, the design level is still at the level of the 1980s and 1990s, and the seal between the vacuum circuit breaker operating mechanism and the inflatable compartment still uses bellows , The welding and sealing technology of bellows is difficult to process. At present, there is only one factory in China that can meet the processing requirements. At the same time, the quality of the bellows itself is also very unstable, so the entire inflatable compartment has a great safety hazard of air leakage. At the same time, most of them are single-chamber structures, and the safety and reliability of equipment operation is low. If a product has a problem, it will cause a total power outage until the maintenance is completed. In severe cases, the entire product may have to be replaced, and the power outage will be longer. This is not allowed by important power supply users, such as railway traffic, aviation, etc. Due to the structure of the single air chamber, there can only be one three-position isolation/grounding switch, so there is no reliable grounding protection at the outgoing or incoming line end, and there is no complete guarantee for the safety of operation and maintenance personnel, which cannot meet the requirements of our country. The actual operating requirements of the power system. The research and development of a high-voltage switchgear with higher safety performance, convenient repair and maintenance, and intelligent level is the basis for the safety assurance of important power-consuming places such as underground railways and aviation.

Contents of the invention

The object of the present invention is to overcome the above-mentioned defects, and provide an intelligent inflatable high-voltage vacuum switchgear for subways, which is reliable in sealing, convenient in maintenance, safe and reliable.

The present invention is achieved as follows: an intelligent inflatable high-voltage vacuum switchgear for subways, which includes a low-voltage chamber, an upper mechanism operating room, a lower mechanism operating room, a lower maintenance room, a lower pressure relief room, a main busbar inflatable room, and a cable installation The main feature is that the main conductive circuit of the high-voltage vacuum switchgear is sealed in the main busbar inflatable chamber and the circuit breaker inflatable chamber, and a three-station The isolating/grounding switch, the main busbar plenum and the circuit breaker plenum are electrically connected by intermediate connectors.

Furthermore, the vacuum circuit breaker air chamber is located at the rear upper part of the switchgear, and contains sulfur hexafluoride insulating gas, plug-in voltage transformer, three-position isolation/grounding switch, vacuum circuit breaker solid-sealed pole, and intermediate connector , connecting busbars, high-current inner cone insulators, plug-in voltage transformers are installed upside down on the top of the air chamber of the circuit breaker, three-position isolation/grounding switches are arranged up and down on the front, and solid-sealed poles of vacuum circuit breakers are installed. The middle static contact of the position isolation/grounding switch is connected to the dynamic conductive end of the vacuum circuit breaker's solid-sealed pole, and the static conductive end of the vacuum circuit breaker's solid-sealed pole is connected to the bottom intermediate connector through a connecting busbar, three-station The front static contact of the main circuit of the isolation/grounding switch is connected to the high-current inner cone insulator through the connecting busbar.

Furthermore, the main busbar gas chamber is located in the middle of the switchgear, and contains sulfur hexafluoride gas, three-phase main busbar, branch busbar, three-station isolation/grounding switch, and intermediate connector. Three-phase main busbars are installed in a font arrangement on the side. The main busbar is connected to the front static contact of the three-position isolation/grounding switch through branch busbars, and the middle static contact of the three-position isolation/grounding switch is connected through the middle of the installation top. connected to the intermediate connector at the bottom of the circuit breaker plenum.

Furthermore, wireless temperature measuring devices are installed at the main connection parts and cable connections of the main busbar gas chamber and the vacuum circuit breaker gas chamber, and an intelligent microcomputer protection device is installed in the low-voltage chamber.

Further, the air chamber of the main busbar and the air chamber of the circuit breaker are welded by double-layer stainless steel plates.

The beneficial effects of the present invention are as follows:

Since the main conductive circuit of the high-voltage vacuum switchgear is sealed in the main busbar air chamber and the circuit breaker air chamber, a three-position isolation/grounding switch is installed in the two air chambers, and two three-position isolation switches are installed in the state of maintenance or power failure. / Grounding switch can be grounded, which effectively guarantees the safety of maintenance personnel during maintenance. The inflatable chamber of the main busbar and the inflatable chamber of the circuit breaker are electrically connected by an intermediate connector. When a large fault occurs in the circuit breaker chamber and cannot be repaired on site, the three-position isolation/grounding switch in the main busbar chamber can be separated, and the relevant connectors can be removed. The air chamber of the vacuum circuit breaker is replaced with a spare chamber, and the power supply can be restored quickly, which overcomes the fatal defects of the previous single air chamber switchgear that cannot be maintained on site and has a long power outage.

The main connection parts of the main busbar gas chamber and the vacuum circuit breaker gas chamber, as well as the cable connection, are equipped with wireless temperature measuring devices. The temperature rise of each part of the switchgear can be monitored through the receiving device. The barometer is also equipped with high and low A dedicated table for air pressure contacts. Combined with the comprehensive protection device, the three-position isolation/grounding switch of the switchgear, the vacuum circuit breaker, the air pressure of each inflatable compartment, and the temperature rise of each main contact of the main circuit can all be monitored on-site and remotely transmitted to the upper-level main monitoring system, so that the switchgear fully meets the requirements of intelligence.

The three-position isolating/grounding switch and the operating mechanism of the circuit breaker are uniformly arranged at the front of the inflatable compartment, and separate compartments are set up. The shells of the two inflatable compartments are of double-layer structure, and the rear of the circuit breaker and the bottom of the main busbar are equipped with explosion-proof valves, so that it can completely guarantee that the adjacent switchgear will not be damaged due to internal faults in the inflatable compartment, fully satisfying IEC62271-200 internal fault arc protection requirements, the safety performance of the switchgear has been further improved, filling the gap in the world for this type of product, and representing the future development direction of medium voltage switchgear.

The invention adopts modular design, vacuum solid-sealed pole technology, and double-layer air chamber structure to achieve maximum personal safety protection, flexible expansion, compact structure, long life, small volume, and intelligent inflatable high-voltage modularization Vacuum circuit breaker cabinet. It can meet the requirements of power transformation and distribution in important electric places such as underground railways and aviation, so that it can reach a higher level of safety assurance.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a left view of the present invention.

Fig. 3 is a cross-sectional view of the present invention.

Fig. 4 is a schematic diagram of main temperature rising parts of the present invention.

In the accompanying drawings, 1—air-tight gauge, 2—three-position isolation/grounding switch operating mechanism, 3—operating handle, 4—rotary magnetic fluid dynamic seal, 5—three-position isolation/grounding switch, 6—direct Dynamic magnetic fluid dynamic seal, 7—vacuum circuit breaker solid-sealed pole, 8—vacuum circuit breaker, 9—connecting busbar, 10—high current inner cone insulator, 11—inner cone insulator, 12—shunt busbar, 13—conductive rod, 14—intermediate connector, 15—connecting busbar, 16—connecting busbar, 201—low voltage room, 202—upper mechanism operating room, 203—lower mechanism operating room, 204—lower maintenance room, 205— Lower pressure relief chamber, 206—main busbar air chamber, 207—cable installation chamber, 208—vacuum circuit breaker air chamber, 209—rear pressure relief chamber, 210—external plug-in voltage transformer, 301—airtight meter, 302 —Intermediate connector, 303—three-position isolation/grounding switch operating mechanism, 304—rotary magnetic fluid dynamic seal, 305—three-position isolation/grounding switch, 306—intermediate connector, 307—main busbar, 308 —Branch busbar, 401—cable head, 402—plug-in arrester, 501—connection between voltage transformer and inner cone insulator and busbar, 502—the middle static contact of three-position isolation/grounding switch and dynamic vacuum circuit breaker The junction of the conductive terminal, 503—the static contact at the front end of the three-position isolation/grounding switch and the connection and fixed busbar, 504—the junction of the static conductive terminal of the vacuum circuit breaker connecting the busbar and the intermediate connector, 505—the shunt busbar The connection with the high-current inner cone insulator, 601—the connection between the plug-in cable connector and the high-current inner cone insulator, 602—the connection between the plug-in arrester and the inner cone insulator, 603—the three-position isolation/grounding switch in the main busbar room The connection between the middle static contact and the middle connector, 604—the connection between the three-position isolation/grounding switch and the branch bus, 605—the connection between the main bus and the branch bus.

detailed description

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1 and Figure 2, the present invention relates to a new intelligent inflatable (C-GIS) high-voltage vacuum switchgear for subways, which includes a low-voltage chamber 201, an upper mechanism operating room 202, a lower mechanism operating room 203, There are ten functional modules including the lower maintenance room 204, the lower pressure relief room 205, the main busbar air chamber 206, the cable installation room 207, the vacuum circuit breaker air chamber 208, the rear pressure relief chamber 209, and the external plug-in voltage transformer 210. Its main feature is that the main conductive circuit of the switchgear is divided into two gas-filled compartments 206,208. The main busbar air chamber 206 is located in the middle of the switch cabinet, and the vacuum circuit breaker air chamber 208 is located in the rear upper part of the switch cabinet. There is a three-position isolation/grounding switch 5 and 305 in both compartments, and there are two in the state of maintenance or power failure. All switches can be grounded, which effectively guarantees the safety of maintenance personnel during maintenance. The main busbar plenum 206 and the vacuum circuit breaker plenum 208 are electrically connected by intermediate connectors 13 , 14 , 302 . When the vacuum circuit breaker gas chamber 208 has a large fault and cannot be repaired on site, the three-position isolating/grounding switch 305 in the main bus gas chamber 206 can be separated, the relevant connectors can be removed, the vacuum circuit breaker gas chamber 208 can be drawn out, and replaced The spare compartment quickly restores the power supply, which overcomes the fatal flaws of the previous single-chamber switchgear that cannot be maintained on site and has a long power outage. Except for the front and rear panels, the switch cabinet body is made of aluminum-zinc-coated steel plates and assembled by CNC machine tools after multiple bending. The compartments 205 and 207 are assembled from aluminum alloy profiles. The main circuit compartments 206 and 208 are double-layered. The stainless steel plate is welded by a fully automatic robot. The consistency, rigidity and processing accuracy of the cabinet are guaranteed, and at the same time, it is convenient for mass production.

Referring to Fig. 1 and Fig. 3; secondary components for control and protection can be installed in the low-voltage chamber 201. The operating mechanism 2 of the three-position isolating/grounding switch 5 , the operating handle 3 and the vacuum circuit breaker 8 are installed in the operating room 202 of the upper mechanism, and an airtight meter 1 is installed at the same time. The operating mechanism 2 of the three-position isolating/grounding switch is connected to the conductive part of the three-positioning isolating/grounding switch 5 in the gas chamber through a rotary magnetic fluid dynamic seal 4 . The operating mechanism of the vacuum breaker is connected with the vacuum solid-seal pole in the air chamber through the direct-acting magnetic fluid dynamic seal 6 . The inflatable compartment 208 of the vacuum circuit breaker is filled with low-pressure SF6 insulating gas, and its top and rear are inverted with a plug-in voltage transformer 210, a plug-in arrester and an inner cone insulator 11 for external electrical testing. , At the same time, it is also used as a support for the busbar. The front part is arranged up and down with a three-position isolation/grounding switch 5 and a vacuum circuit breaker solid-sealed pole 7, and the middle static contact of the three-station isolation/grounding switch 5 is connected to the dynamic conductive end of the vacuum circuit breaker solid-sealed pole 7 , the static conductive terminal of the vacuum circuit breaker's solid-sealed pole 7 is connected to the bottom intermediate connector 14 through a connecting busbar 9, and the front static contact of the three-position isolating/grounding switch 5 is connected to the other through a connecting busbar 16. The busbar 15 is connected, and the connecting busbar 15 is connected with the high-current inner cone insulator 10 through the shunt busbar 12 to form a complete main circuit of the vacuum breaker inflatable compartment.

See Fig. 1 and Fig. 3: the operating mechanism 303 of the three-position isolating/grounding switch is installed in the operating room 203 of the lower mechanism, and the air-tight meter 301 of the main bus inflatable compartment 206 is also installed, and the three-position isolating/grounding switch is operated. The dynamic mechanism 303 is connected with the three-position isolating/grounding switch 305 in the air chamber through the rotary magnetic fluid dynamic seal 304 . Three-phase main bus intermediate connectors 306 are installed on the left and right sides of the lower part of the main bus inflatable compartment. The intermediate connectors 306 can connect the bus between cabinets, and the left and right intermediate connectors are connected with three-phase main bus bars. 307, the main busbar 307 is connected to the front static contact of the three-position isolation/grounding switch 305 through the branch busbar 308, and the middle static contact of the three-position isolation/grounding switch 305 is connected to the intermediate connector 302, thereby into a complete main circuit.

See Fig. 3: The electrical connection between the main busbar plenum chamber 206 and the vacuum circuit breaker plenum chamber 208 is connected through the intermediate connector 302 and the intermediate connector 14, and the conductive rod 13 with strap-type spring contact fingers is in the middle for conductive connection . And it is insulated by a silicone rubber sleeve.

See Figure 3: Two 1250A cable heads 401 can be installed for each phase in the cable installation room 207. If the current is small and only one cable needs to be installed, a three-phase plug-in arrester 402, cable head and arrester can be installed at the same time All are electrically connected to the inner cone insulator 10 of the vacuum circuit breaker gas-filled compartment 208 through a plug-in type.

See Figure 4: The main conductive parts of the intelligent inflatable (C-GIS) high-voltage vacuum switchgear for subway use wireless detection to monitor the temperature rise of each part, which can predict and monitor in advance whether the switchgear is in normal operation and reduce the risk of accidents. When used together with the intelligent microcomputer protection device, the switchgear can fully meet the requirements of intelligence, and the safety performance of the switchgear can be further improved. Monitorable parts 501 at the connection between the voltage transformer and the inner cone insulator and the busbar, 502 at the connection between the middle static contact of the three-station isolation/grounding switch and the moving conductive end of the vacuum circuit breaker, and the front-end static contact of the three-station isolation/grounding switch Connecting and fixing busbar connection 503, vacuum circuit breaker static conductive terminal connecting busbar and intermediate connector connecting place 504, shunt busbar and high-current inner cone insulator connecting 505, plug-in cable connector and high-current inner cone Insulator connection 601, plug-in surge arrester and inner cone insulator connection 602, main bus room three-position isolation/grounding switch intermediate static contact and intermediate connector connection 603, three-position isolation/grounding switch and branch busbar connection At 604, at 605 where the main busbar and branch busbar are connected.

It should be pointed out that the present invention is not limited to the above-mentioned embodiments, and any simple modification, equivalent change and modification made to the above-mentioned embodiments within the technical solution of the present invention by any skilled person familiar with the profession all belong to the protection scope of the present invention .

Claims (2)

1. An intelligent inflatable high-voltage vacuum switchgear for subways, which includes a low-voltage chamber, an upper mechanism operating room, a lower mechanism operating room, a lower maintenance room, a lower pressure relief room, a main busbar inflation room, a cable installation room, and a vacuum circuit breaker The air chamber and the rear pressure relief chamber are characterized in that the main conductive circuit of the high-voltage vacuum switchgear is sealed in the air chamber of the main busbar and the air chamber of the circuit breaker, and a three-position isolation/grounding switch is installed in the two air chambers. The upper mechanism operating room and the lower mechanism operating room are equipped with a three-position isolation/grounding switch operating mechanism, and the upper mechanism operating room is also equipped with a vacuum circuit breaker operating mechanism. The inflatable chamber of the device is electrically connected with an intermediate connector. 2. An intelligent inflatable high-voltage vacuum switchgear for subways as claimed in claim 1, wherein a wireless temperature measuring device is provided at the connecting part of the main busbar inflatable chamber and the vacuum circuit breaker inflatable chamber, The above-mentioned low-voltage chamber is equipped with an intelligent microcomputer protection device.