Permanent Magnet Inflatable CabinetsApplication effect and defect of

2.1 The application effect is remarkable.

(1) Strong applicability

In western China, there are high elevations, condensation, salt mist and pollution, and more and more high-rise buildings have high reliability, concentrated industrial and commercial areas and rail transit construction projects. C-GIS has become the best power distribution equipment. It is not only unaffected by the atmospheric state, but also small size, saving area, in the layout, size and appearance of more coordinated with the surrounding environment, so that the comprehensive economic benefits of engineering construction is very obvious. In Kunming, Guiyang, Chengdu and other urban road network upgrading and energy expansion projects, the selection of C-GIS, with good operating efficiency.

(2) Good installation performance

The C-GIS is made up of standard modules for a wide range of high-voltage components to meet the requirements of a wide range of main wiring and various use situations. The whole is shipped to the scene, and there is a complete set of hoisting in place. The installation does not involve SF6 gas treatment. It is also convenient to expand the number of outlet cables through a reserved cable socket, or to extend the cabinet to one or both sides of the enclosure. The high pressure element is installed in the box-shaped inflatable housing to facilitate the introduction and extraction of the cable as a power supply. The connection with the transformer is more convenient to arrange, not limited by space, more easy to form the system.

(3) Good safety performance

Because the conductive part of the main circuit of C-GIS is sealed with SF6 and other insulating gas, the high voltage charged conductor is sealed, which has the advantages of high reliability and frequent operation. It can meet the technical requirements of large fixed current, large short circuit open power flow, frequent operation and low overvoltage caused by the rapid increase of substation load, and can accurately accept and distribute the energy in the circuit. Implement effective control, protection and testing. For example, Hangzhou users in the use of C-GIS, did not find the danger of electric shock and fire, to ensure the safety of equipment and operators.

(4) High Maintenance performance

Because the C-GIS high pressure element uses gas or metal seal, the component is non-corrosive, rust, does not affect the operation and conductivity, the maintenance workload is very small. Vacuum circuit Breaker has a long service life, stable performance, no maintenance, small maintenance.

2.2 Main defects of the application

(1) Insufficient docking of production and demand

Some manufacturers are still at the level of the early 90, and the production of C-GIS, based on the early C-GIS,12 kv of 40.5 kv, replaces the 40.5 KV components with only 12,000 volts of corresponding components, while the shape of the cabinets remains virtually unchanged. By contrast, this product is shoddy.

(2) 12kv C-gis market prices are too high, do not necessarily use C-gis users do not accept. It is estimated that the overall cost of the cabinet is 1.5 times times that of ordinary cabinets, but at present the price of most cabinets is still about 3 times times that of ordinary cabinets, the price is unacceptable to a considerable number of users.

(3) Many products are still in an imperfect stage of development, such as the use of compressed air as an inflatable medium, due to the pressure difference between SF6 and SF6, may lead to changes in material selection, resulting in changes in equipment performance. For example, according to GB3906-1991 national standards, the highest level of continuity of power supply is LSCB2, while 50% of C-GIS still use a single room, so it needs to be changed to a double room.

(2) Backward manufacturers supporting services

(1) because some 12kv c-gis manufacturers exaggerate the performance of the product, coupled with the specified maintenance cycle of the extension and the difficulty of system downtime maintenance, some users relax maintenance and management, equipment operation from the occasional occurrence of disease, so that insulation switchgear failure.

(2) Due to competition reasons, manufacturers set up technical barriers can not be attributed to users, but users in the purchase of products, can only get a general, concise instructions, lack of authoritative 12kv c-gis maintenance process Guide, hindering the user's use and maintenance skills to improve.

(3) Different manufacturers of equipment and accessories of different types, maintenance spare parts difficult to allocate, the same model of different manufacturers of maintenance technology and technical standards are not uniform, installation and use