What Is Gas Insulated Switchgear?
- Pressure Effects in Switchgear
- SF6 Gas Insulated Substations
- Protection of transformers with trapped-key interlocking
- Load Breaking Devices with Limited Short Circuit Breakdown Capability for High Switch Rate
- Underground GIS Substation Design
- Power Conducting and Control Systems
- Gas-insulated substations
Pressure Effects in Switchgear
The equipment being used in switchgear can be under pressure. Testing is necessary to overcome many problems. An insulation test is recommended.
SF6 Gas Insulated Substations
The equipment in a GIS substation are housed in metal-enclosed modules. The SF6 gas provides insulation. SF6 Gas insulated Substations are compact and can be installed on any floor of a multi-storeyed building. Installation time is reduced as the units are factory assembled.
Protection of transformers with trapped-key interlocking
Protection is the interruption of short-circuit and overload fault currents while maintaining service to unaffected circuits. The circuits from power supplies are isolated from the switchgear. More than one source can feed a load, and switchgear is used to enhance system availability.
Two identical current transformers are used for each winding of a transformer. The winding has current transformers placed around it. The current should be the same.
A protective relay and circuit breakers are used to protect the device. The circuit breakers on the primary and secondary would open in a transformer. Ratings, design, specifications and details of switchgear are set by a lot of standards.
Most of the world uses the same standards, but with local national variations or derivatives. The trapped-key interlocking helps ensure safe operation of the switchgear. If only one source of supply is allowed to be connected at a time, the interlock scheme may require that the first switch be opened to allow the second switch to close.
Load Breaking Devices with Limited Short Circuit Breakdown Capability for High Switch Rate
Load breaking devices with a limited short circuit breaking and making capacity are used for high switch rates and can be divided into two types, air-insulated and vacuum contactor.
Underground GIS Substation Design
The metal- enclosed gas insulated switchgear is a better solution for new substation design than other solutions. The most suitable solution for indoor and underground substations is the gas enclosed design of the GIS. An underground GIS substation can be designed to hide its presence.
The existence of a substation could be designed so that it is not even recognized. The same function is performed by the GIS. The design of the GIS has advantages over the other.
The high initial investment is a key obstacle in expanding the application of the geographic information system. In remote or rural areas, the best choice is still the AIS. In places where the cost of earthworks is high or the sceneries cannot be disturbed by the use of an instrument like an instrument for spatial information, underground or indoor geographic information system is the solution.
The cost of primary hardware is more expensive than the cost of the equipment. The price of auxiliary equipment can lead to a cost difference between the two systems. The maintenance cost of the GIS is less than that of the other two systems because of the low failure rate of the circuit breaker and switch.
Power Conducting and Control Systems
The power conducting and control systems are included. The components of power are used to interrupt the flow of electric power.
Gas-insulated substations
Reduced space requirements are one of the advantages of gas-insulated substations. The Substation is enclosed in a building which makes it less sensitive to pollution. The initial cost of building a GIS is higher than the cost of making an air-insulated substation.
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