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Fuses and Circuit Breakers
Published in Amitava Sil, Saikat Maity, Industrial Power Systems, 2022
A switchgear or electrical switchgear is a generic term which includes all the switching devices associated with mainly power system protection. It also includes all devices associated with control, metering and regulating of electrical power system. Assembly of such devices in a logical manner forms switchgear. Switchgear has to perform the function of carrying, making and breaking the normal load current like a switch and it has to perform the function of clearing the fault in addition to that it also has provision of metering and regulating the various parameters of electrical power system. Thus, the switchgear includes circuit breaker, current transformer, voltage transformer, protection relay, measuring instrument, electrical switch, electrical fuse, miniature circuit breaker, lightening arrestor or surge arrestor, isolator and other associated equipment. Switchgear protection plays a vital role in modern power system network, right from generation through transmission to distribution end. The current interruption device or switching device is called circuit breaker in Switchgear protection system.
Electric Generator Switchgear & Controls
Published in Neil Petchers, Combined Heating, Cooling & Power Handbook: Technologies & Applications, 2020
Switchgear is an assembly of switching, interrupting, regulating and protective devices, control logic circuitry, instrumentation, and metering devices required for the safe distribution of electric power. With localized on-site electric generation applications, generator switchgear manages one or more generators in a prearranged control strategy to safely meet the needs of the host facility and, where applicable, the requirements of the utility grid. Figure 27-1 shows switchgear for an on-site generator application.
Hardware for Distribution Systems
Published in James Northcote-Green, Robert Wilson, Control and Automation of Electrical Power Distribution Systems, 2017
James Northcote-Green, Robert Wilson
Switchgear is a general term covering switching devices and assemblies of such devices with associated interconnections and accessories. The following classifications of switching devices are in general use within the utility distribution industry.
Adsorptions of C5F10O decomposed compounds on the Cu-decorated NiS2 monolayer: a first-principles theory
Published in Molecular Physics, 2023
Hailong Wu, Yalong Xia, Chenmeng Zhang, Shijun Xie, Siqing Wu, Hao Cui
For several decades, SF6 is extensively applied as the insulation medium, accounting for about 80% of total usage, in high-voltage equipment such as gas-insulated switchgear (GIS), gas circuit breaker (GCB), gas-insulated transformer (GIT) and transmission line (GIL), due to its outstanding insulation and arc extinguishing performances [1,2]. On the other hand, SF6 has a grievous global warming effect, whose retention time in the atmosphere is over 3200 years with significant global warming potential (GWP) as 23,500 times as that of CO2 [3]. Worse still, the amount of SF6 in our global atmosphere is increased by about 20% during the past 5 years [4], implying it is an increasingly and potentially serious threat to our living environment. Thereby, scholars all around the world are making every sacrifice to explore novel insulation medium to reduce or even replace the use of SF6 in the power equipment [5,6].
A DFT Based Approach to Sense the SF6 Decomposed Gases Using Ni-doped WS2 Monolayer
Published in IETE Technical Review, 2022
Suman Sarkar, Papiya Debnath, Debashis De, Manash Chanda
Day by day, the demand for SF6 has been increasing rapidly in the gas-insulated subsystem (GIS) [1–6] like a breaker, switchgear, transmission line, and transformer because of its highly stable, outstanding reliability, high safety, flexible configuration, and excellent arc quench properties. However, if a GIS runs for a longer time, some insulation problems or inherent defects are created and release partial discharge (PD). The SF6 discharge decomposes into low fluoride components of sulfide (SFX, x = 1–5), i.e. SF2, SF3, and SF4. Further, the reaction of SFX with O2 and trace water forms SO2, SOF2, and SO2F2. These SF6 decomposed gasses (SDGs) are corrosive, and in the oxygen-abundant environment and trace water, decomposed gases increase the rate of aging of an insulating medium consisting of solid material.
Investigating the role of internal layout of magnetic field-generating equipment on workers’ exposure at power substations
Published in International Journal of Occupational Safety and Ergonomics, 2021
Monireh Hosseini, Laleh Farhang Matin, Mohammad Reza Monazzam, Hossein Khosroabadi
Figure 1a shows the site plan of the LV switchgear room as well as the layout of the equipment in it. The equipment in the room includes three one-to-one transformers (400 V/400 V), one 6-kV/400-V transformer and electrical panels with a voltage of 400 V. By examining the results of field measurements at the points specified in the LV switchgear room, the 6-kV/400-V lowering transformer (transformer A) and the incoming panel (panel C) in the middle of the room were recognized as the generating sources of maximum magnetic flux density. Electrical technicians are the only occupational group passing the side of the equipment in the middle of the room to visit and explore any of the internal equipment in it. As mentioned earlier, the TWA value for this occupational group was calculated as 2.01 μT.