Gas-insulated switchgear (GIS) 72–1100 kV
This GIS is intended for substations of transmission and distribution networks and for power plant switchgear at voltages from 72 to 1100 kV. The company has produced SF6 circuit breakers since 1968, when it commercialized the first such unit in Japan.
- Rated voltage
- 72–1100 kV
- Insulation
- SF6 gas; an SF6-free line is being developed (vacuum + dry air)
- Composition
- circuit breakers, disconnectors, earthing switches, CTs, VTs, surge arresters, busbars in a metal enclosure
- Application
- network substations, open and indoor switchgear of power plants, including nuclear plants
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
All elements of a GIS bay are placed in earthed metal enclosures filled with SF6 gas. The bay includes circuit breakers, disconnectors and earthing switches, current and voltage transformers, surge arresters, busbars, and cable or overhead line terminations. The dielectric strength of SF6 makes it possible to reduce insulation clearances several times compared with an open-air switchyard, so the substation occupies a much smaller area. The earthed metal enclosure also protects live parts from dust, moisture and contamination, so the insulation does not depend on the climate at the site.
Among the advantages of its GIS the manufacturer names space saving, layout flexibility and a smaller volume of civil and erection work on site, and therefore shorter installation times. Maintenance is reduced to a minimum, and operational safety is built into the design. For urban substations, indoor switchgear and the extension of existing facilities without additional land, these are the main arguments in favor of GIS.
The basis of the bay is the SF6 circuit breaker. In developing it the company uses, among other things, thermal analysis of gas flows during current interruption. Since the first unit appeared in 1968, the company has supplied circuit breakers and GIS across the whole range from 72 to 1100 kV. For the 550 kV class, circuit breakers are made in both dead tank and live tank types, and the range of breakers and their operating mechanisms is being updated. The company produces surge arresters of various types, including insulator-type units for 500 kV for transformers.
GIS are part of the company's equipment range for nuclear power plants, where they are installed in the switchgear connecting the plant to the grid. The same units are used in open and indoor switchgear of other power plants. They are also used to equip transmission substations of extra-high voltage networks, where compactness and minimum maintenance bring the greatest benefit.
Recently the company has been developing an SF6-free line with zero CO2-equivalent emissions. The experience of vacuum switching and dry-air insulation gained on medium-voltage equipment is being transferred to units of higher voltage classes in accordance with the published roadmap. For the customer this means the prospect of substations without fluorinated gases in future projects.
Technical specifications
| Rated voltage | 72–1100 kV |
|---|---|
| Insulation | SF6 gas; an SF6-free line is being developed (vacuum + dry air) |
| Composition | circuit breakers, disconnectors, earthing switches, CTs, VTs, surge arresters, busbars in a metal enclosure |
| Application | network substations, open and indoor switchgear of power plants, including nuclear plants |
| Experience | first GCB in Japan, 1968 |
Request a price and lead time
Gas-insulated switchgear (GIS) 72–1100 kV. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Customs codes
| UKTZED (Ukraine) | 8537 20 99 00 |
|---|---|
| HS, 6 digits | 8537 20 |
| CN (EU) | 8537 20 99 |
| HTSUS (USA) | 8537 20 00 00 |
| China customs tariff | 8537 20 10 00 8537 20 90 00 |
Codes are for reference: the final code is determined at declaration for the specific model.
Questions and answers
For which voltage classes is the GIS produced?
From 72 to 1100 kV, for network substations and power plant switchgear.
What equipment is included in a GIS bay?
Circuit breakers, disconnectors, earthing switches, current and voltage transformers, surge arresters, busbars and terminations in an earthed metal enclosure with SF6 gas.
Does the manufacturer offer SF6-free GIS?
The company is developing an SF6-free line based on vacuum switching and dry-air insulation. The medium-voltage experience is being transferred to higher classes under the published roadmap.
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