Скачать с ютуб 32 GIS Explained CT VT Isolaor Earth Switch, Gas Compartments and CB в хорошем качестве

32 GIS Explained CT VT Isolaor Earth Switch, Gas Compartments and CB

Gas-insulated substations (GIS) use circuit breakers, disconnect switches, and grounding switches, and have various means of indicating their position, either opened or closed, so the same as in air-insulated substation (AIS). Operation of a GIS uses most of the same principles as operating an air insulated substation (AIS) although the various active components are physically configured differently. The first obvious difference is that the blades of the disconnect switches and the grounding switches used in a GIS are surrounded by grounded metallic enclosures. This enclosure prevents the blades from being readily and easily visible to determine their fully opened or fully closed position. The second obvious difference relates to the bus conductors being located inside grounded metallic enclosures. Generally a GIS requires more extensive electrical interlocking between the circuit breakers, disconnect switches (isolators), and grounding switches. The specific detailed method of operating and interlocking is generally specified by the ultimate user of the GIS. This problem can be solved by using gas insulated switchgear technology. In this type of switchgear, all the necessary components of switchgear can be assembled in very limited space. GIS is a kind of metal enclosed switchgear. That means, all the equipments of the electrical switchgear are enclosed by gas tight metal enclosure and SF6 gas is used as insulation between live parts of the equipments and earthed metal enclosure. This type of switchgear, means, and gas insulated switchgear is available from 12 KV systems to 800 KV system. For establishing electrical substation in very limited place this type of SF6 insulated electrical switchgear plays the major role. Gas insulated components of substation are generally, Electrical bus bars. Electrical isolators or disconnectors. Circuit breakers. Current transformers. Voltage transformers. Earth switches. Surge arrestors or lightning arresters.