Unsa ang GIS?
Definision sa GIS device
Ang GIS mao ang abreviatura sa Gas Insulated Switchgear, nga kasagaran isulti isip gas insulated fully enclosed combination appliance, kasagaran gigamit ang SF6 gas isip insulating medium. Kini naglakip sa circuit breaker (CB), isolation switch (DS), ground switch (ES, FES), BUS (BUS), current transformer (CT), voltage transformer (VT), lightning arrester (LA) ug uban pang high voltage components. Sa karon, ang mga produkto sa GIS equipment nagsilbi na sa voltage range gikan sa 72.5 kV ~1200 kV.
Caracteristics sa GIS equipment
Tungod sa excellent insulation performance, arc extinguishing performance ug stability sa SF6 gas, ang GIS equipment adunay mga advantage sama sa small footprint, strong arc extinguishing ability ug high reliability. Apan, ang insulation ability sa SF6 gas dako kaayo ang epekto sa uniformity sa electric field, ug prone sa insulation anomalies kung may tips o foreign objects sa GIS.
Ang GIS equipment naggamit og completely closed structure, nga naghatag og mga advantage sama sa internal components free from environmental interference, long overhaul cycle, less maintenance work, low electromagnetic interference, ug sa samang panahon, adunay usab mga problema sama sa complex single overhaul work ug relatively poor detection means, ug kung ang closed structure magkasira tungod sa external environment, mahimo na mapasabot sa water intake ug air leakage.
Ang internal structure sa GIS devices
Ang conductive loop sa GIS gisulbad sa daghang komponente. Sumala sa working method, mahimong makat-ang sa: fixed contact (electrical contact fastened with fasteners such as screws is called fixed contact, and fixed contact has no relative movement during the working process. Such as the connection between the contact and the basin, etc.), contact contact (the electrical contact that can be separated during the working process is also called separable contact), sliding and rolling contact (during the working process, the contacts can slide or roll each other, but the electrical contact that cannot be separated is called sliding and rolling contact. The middle contact of the switchgear is the use of this electrical contact).
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GIS substation
Sulfur hexafluoride closed combination electrical appliances, internationally known as "Gas insulated Switchgear" (Gas lnsulated Switchgear) referred to as GIS, it will be a substation in addition to the transformer in the primary equipment, Including circuit breaker, isolation switch, ground switch, voltage transformer, current transformer, lightning arrester, bus, cable terminal, inlet and outlet line bushing, optimized design organically combined into a whole. In addition to GIS, there is a HGIS, designed for harsher environments, due to the relative GIS less bus, bus pressure change, lightning arrester and other equipment, especially the bus, the use of more flexible.
Advantage
Miniaturization: SF6 gas with excellent insulation performance is used as insulation and arc extinguishing medium, which greatly reduces the volume of substation.
High reliability: the live parts are all sealed in inert SF6 gas, which improves the reliability of the substation.
Good safety: the live part is sealed in the grounded metal housing, so there is no risk of electric shock. SF6 gas is a non-burning gas, so there is no fire hazard.
Eliminate adverse effects on the outside: the live part is closed with a metal shell, shielding electromagnetic and static electricity, low noise, strong anti-radio interference ability.
Short installation cycle: The realization of miniaturization makes the whole machine assembly and test qualified in the factory, can be shipped to the site in the form of units or intervals, so it can shorten the site installation period, but also improve reliability.
Easy maintenance, short maintenance time: because of its reasonable structure layout and advanced arc extinguishing system, it greatly improves the service life of the product, so the maintenance cycle is long, the maintenance workload is small, and because of miniaturization, low from the ground, it is convenient for daily maintenance.
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Ang GIS mahimong ma-classify isip outdoor type o indoor type sumala sa installation location.
Ang GIS mahimong ma-divide ngadto sa duha ka forms: single-phase single-cylinder ug three-phase common cylinder. Ang 110kV voltage level ug ang bus bar mahimo mopagbutang isip three-phase common cylinder type, ug ang single-phase single cylinder type gamiton alang sa 220kV ug uban pa.
Operating principle
Sa normal cases, ang circuit breaker ug isolation switch sa GIS device kinahanglan ma-operate sa remote area. Ang circuit breaker ug isolation switch enabled sa remote/local area para focus sa remote location.
Ang ground switch sa GIS device mahimo lang ma-operate sa local area. Kapag operate ang ground switch, switch ang switchblade/ground knife sa remote/local area.
Sa anumang case, only ang program operation mahimo lang matuman, ang "interlock release switch" sa wire control cabinet kinahanglan sa "interlock" position, ug ang iyang unlock key ug ang computer anti-misunderstanding lock key sealed together ug gamiton sumala sa same provisions
Operational requirement
Indoor SF6 equipment room frequently entered by operators: ventilation at least once per shift for 15 minutes, the air exchange volume should be greater than 3-5 times the air volume, and the air outlet should be installed in the lower part of the room; Equipment places that are not frequented by operators: ventilate for 15 minutes before entering.
Para sa mga bahin nga madaling matikdan sa operation ug maintenance personnel, sa normal circumstances, ang induced voltage sa shell ug frame dili dapat mogawas sa 36V.
Temperature rise: ang bahin nga madaling matikdan sa operator dili dapat mogawas sa 30K; Ang bahin nga madaling matikdan sa operator apan wala matikdan sa operation dili dapat mogawas sa 40K; Individual parts nga dili madaling matikdan sa operator dili dapat mogawas sa 65K.
SF6 switchgear inspection, at least once a day, unattended substation inspection according to regulations. During the inspection, the main inspection is to check the appearance, whether the equipment is abnormal, and make a record.
