SF6 gas insulated transformer
With the development of urban construction, there are more and more subways, high-rise buildings and underground buildings, the electricity consumption is increasing, and the requirements for the safety of power supply are also increasing. Electricity departments urgently require transformer manufacturing companies to produce transformers with good fire resistance, small installation area and low noise. SF6 gas insulated transformer (GIT for short) was developed to meet this requirement. SF6 gas insulated transformer uses non-flammable, disaster-proof and safe SF6 gas as the insulating medium. So far, it has been recognized as the only power transformer with high-voltage and large-capacity power transformers with superior disaster prevention performance.
Oil-immersed transformers are prone to explosion and fire in the event of a fault, and the leaked dirty oil will pollute the environment. Therefore, it is not suitable for use in densely populated areas and occasions with high fire and explosion requirements. However, due to defects in heat dissipation performance and electric field strength, dry-type transformers cannot be designed and manufactured to reach the level of 110kV-class large-capacity transformers. This product overcomes the shortcomings of the above oil-immersed transformers and dry-type transformers, and meets the requirements of 110kV high-voltage, large-capacity, and superior fire-proof and explosion-proof performance. It is suitable for occasions where power transformers with superior disaster prevention and safety performance are required to be provided in densely populated urban areas and rail transit.
1. GIT has superior fire and disaster prevention performance, and is green and environmentally friendly
SF6 gas is a non-flammable gas, and its physical and chemical properties are very stable. There is no need for additional fire-fighting equipment, and no oil pollutes the environment.
2. The only disaster-proof transformer that can achieve high voltage and large capacity
So far, the fire-proof and disaster-proof transformers used in the world are mainly dry-type transformers and GIT. But the former recognized the highest voltage of 35kV and a capacity of 20MVA; while the latter can reach 220kV and 240MVA.
3. Simple maintenance and longer lifespan
The transformer is completely sealed in the shell air box. When the external GIS is connected, the unconnected part is exposed to the air, eliminating the adverse effects of moisture and dust on the operation of the transformer, convenient maintenance, and longer life.
4. Small footprint, more compact substation, flexible layout
The area of GIT is roughly equivalent to that of oil-immersed transformers of the same capacity and voltage level, but there is no need for additional fire-fighting equipment, no underground oil pool and oil storage system. The density of SF6 gas is low, and the radiator can be flexibly arranged in staggered layers and across layers according to local conditions. When the power distribution device adopts a fully enclosed combined electrical appliance (GIS), if the GIT is directly connected to the GIS, auxiliary equipment such as cable heads can be omitted, so that the area of the substation is greatly reduced.
5. Lower transformer installation height, reducing civil construction costs
Since GIT does not have an oil conservator, it can reduce its height by 20% compared to oil-immersed transformers. If the cable/inflatable connector outlet method is used, the height can be reduced by 30%, which is useful for reducing underground substations. The investment in civil engineering is very favorable.
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