Gas insulated substation (GIS) Gas insulated substation (GIS) typically used in high voltage applications where all conductive parts are encapsulated in sealed cylinders with SF6 as an insulating medium. On the other hand, the Air Insulated (AIS) substation contains air as an insulating medium, and this type of substation is almost always the outdoor type. Mastering GIS Control Circuits – AC / DC auxiliary circuits and circuit breaker closing circuit was founded in Japan in the 1960s due to the urgent need for small size substations. Therefore, GIS is not always possible if space availability is not an issue. The GIS enclosure is designed to accommodate three-phase equipment that reaches the level of 170 kV and single-phase equipment thereafter. GIS is the same as air isolated substation (AIS) in terms of function, but differs in many other ways. Substation component specifications, installation, etc. Table of contents: High voltage GIS control circuits GIS components Single line GIS diagram Switches for reading diagram Substation control systems AC / DC circuits Circuit breaker closing circuit Motor drive circuit Latching circuit 1. High GIS control circuits The voltage of the SF6 circuit breaker, for example, is used in both AIS and GIS with only one difference being that the circuit breaker in GIS does not have an SF6-to-air sleeve. It is connected directly to the Geographic Information Systems Unit. In the same way, all components are subject to such changes to accommodate the GIS, and there are many differences in the GIS unit ranging from linking the breaker only to integrating all components as shown in Figure 1 below, and the choice depends on the required function and cost factor. Often a local control cabinet (LCC) is provided for each bay location to house the GIS bay wires and connect them to the substation control room. The LCC consists of a mimic scheme, switches / indicators, and anchor / synaptic. Although the LCC is not considered to be a component of a GIS, it controls its operation. LCC is the control cabinet that contains GIS control circuits. These control circuits are similar to what is discussed in MV control circuits in two articles: Mastery of switchgear control circuits: AC / DC circuits and circuit breaker closing circuit, Mastery of switchgear control circuits: trip, BCPU and alarm , Signal and interlock circuits. – GIS modules Figure 1 – GIS modules The same principles already described are still applicable to these circuits. The exception is that there are additional functions to calculate the size of the GIS system and the associated hazards. Thus, it is highly recommended that you go through these two articles before moving on to the control circles of GIS because the basic principles are the same and have not been discussed in detail here as in the two aforementioned articles. membership. Get access to all premium HV / MV / LV technical articles, electrical engineering guides, and papers. Check the benefits of each plan and choose the membership plan that works best for you or your organization. You can choose the Plus, Pro, or Enterprise membership plan on a yearly basis. – Get 15% off Pro plan, use discount code: ZX21FLog InSign Up related EEP content with sponsored links
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