Switchgear Types - Examples SWITCH-FUSE LUCY SWITCHGEAR FRMU FUSESWITCH Used where load switching and isolation is a requirement, and also protection of circuits Earth Contact Fuse and Fuse contacts Moving Contacts Transformer or Cable Connections Fuse Trip Latch Oil (2) Metal-enclosed compartmental switchgear, similar to armored metal-enclosed switchgear, its main electrical components are also installed in separate compartments, but have one or more non-metal partitions that meet a certain degree of protection. The horizontal busbar adopts the horizontal arrangement behind the cabinet to enhance the ability of the busbar against electric power, which is a basic measure to make the main circuit with high short-circuit strength capability. The single pressure system is the state of art for high voltage switchgear system, in present time. Electric switchgear is necessary at every switching point in the electrical power system. According to the requirements of modern industrial product design, the cabinet shape and the division size of each part are designed by using the golden ratio method to make the whole cabinet beautiful and fresh. The types of switchgear are connected to high voltage and low voltage cables and comprise of auto switchgear, circuit breakers, protection equipment and motor magnet switch. So CBs must be reliable enough to ensure safe operation, as when required. A wide variety of types of switchgears options are available to you, such as moulded case, distribution box, and high voltage. An effective although more costly form of switchgear is gas insulated switchgear (GIS), where the conductors and contacts are insulated by pressurized sulfur hexafluoride gas (SF6). The protection level of the cabinet is IP30, and users can also choose between IP20-IP40 according to environmental requirements. Therefore, plastic case switches are generally used in MCC. The main requirement of MV power network is to interrupt current during faulty condition irrespective of what type of CB is used in the MV switchgear system. Low Voltage Switchgear (LV) The power system which deals up to 1KV is called as LV or low voltage switchgear. ① The MNS type low voltage switchgear frame is a combined structure, all structural parts are galvanized, and the internal dimensions, component dimensions, and compartment dimensions are changed in accordance with the modularization. When the electrical components in the cabinet heat up, the heat rises and is discharged through the upper slot, while the cold air is constantly replenished into the cabinet from the lower slot to make the sealed cabinet free A natural ventilation duct is formed from bottom to top to achieve the purpose of heat dissipation. Be it energy supply corporations, industry or power stations, any owner or user of primary distribution systems for medium voltage places high demands on the switchgear. Types of switchgear. Types of Switchgear. This standard provides common rules that are recognized worldwide. The wall switch is one of the most common and important electrical devices in the home. There exist different devices that can be integrated into switchgear depending on the need. 2. Low Voltage. The accident caused. According to the power design regulations, the load of 75KW and above is powered by the PC. It can be rated for up to 38 kV and can have current ratings up to 6,000A. The switchgear has the advantages of reasonable structure, convenient installation and maintenance, good protection performance, high breaking capacity, large capacity, strong segmentation ability, strong dynamic stability, and wide applicability of electrical schemes. are fixedly installed, and the fixed switch cabinet is simple and economical. Disadvantages: high cost, which is difficult for small and medium users. It is used in large-scale power plants, petrochemical, telecommunication systems and other places that require high automation and computer interface, as a low-voltage power distribution device for power distribution, centralized motor control, and reactive power compensation in power generation and power supply systems. It is easy to assemble and does not require special complexity. Air Circuit Breaker – In air circuit breaker the arc is initiated and extinct in the static air in which the arc moves. It can also be used in large power plants, petrochemical systems and other places with high degree of automation and computer interfaces. Because the handcarts cabinet has good interchangeability, it can greatly improve the reliability of power supply, the commonly used types of handcarts are: isolation handcarts, metering handcarts, circuit breaker handcarts, PT handcarts, capacitor handcarts and used handcarts, etc. Switchgear is a distribution panel which distributes electricity load to smaller capacity panel. Bolted electrical connections should be inspected for high resistance, either by use of a low-resistance ohmmeter (DLRO), calibrated torque-wrench, or infrared scan.Loose bolted electrical connections can lead to higher energy consumption and eventual equipment failure if not properly addressed. The accessibility of type A and B is defined more precise, by defining different sides of the enclosure as front (F), lateral (L) and rear (R) side. Compliance with the standard is certified, depending on the country or market, by a declaration of the panel builder, the design office, the installer or the user. Mechanical switches can be classified into different types based on several factors such as method of actuation (manual, limit and process switches), number of contacts (single contact and multi contact switches), number of poles and throws (SPST, DPDT, SPDT, etc. Switchgear refers to a complete set of power distribution devices assembled from primary equipment and secondary equipment according to a certain circuit plan. Contact Timing Test . (1) For indoor use (indicated by N); it can only be installed and used indoors. Your email address will not be published. Switchgear is tested to a different UL standard than panelboards and switchboards. Just to mention before going into test, that low voltage switchgear and controlgear assemblies (Un ≤ 1000 V AC) may be used … 1.Low Voltage Switchgear (LV) Your email address will not be published. ① The basic frame of the switchgear is assembled with C-shaped open steel, with uniform appearance, high precision and good drawer interchangeability. The top cover of the cabinet can be removed when needed to facilitate the assembly and adjustment of the main bus on site. Its primary function is to interrupt fault currents. An effective although more costly form of switchgear is the gas-insulated switchgear (GIS), where the conductors and contacts are insulated by pressurized sulfur hexafluoride gas (SF6). Generally speaking, withdrawable cabinets are less space-saving, convenient for maintenance, and more outgoing circuits, but they are expensive; while fixed ones have fewer outgoing circuits and occupy more land. The requirement of electric power has increased a lot, so in order to get a continuous power supply. MNS type low-voltage switchgear adapts to the needs of various power supply and power distribution, and can be widely used in various low-voltage power distribution systems such as power plants, substations, industrial and mining enterprises, buildings, hotels, and municipal construction. A piece of switchgear may be a simple open air isolator switch or it may be insulated by some other substance. Image Posted on March 16, 2012 by chr8crimgh. The switch cabinet shell is a metal-enclosed switchgear. Switchgear are also essential a type of electrical distribution device that is used to convert incoming electrical power into several smaller voltages. The design is compact and can accommodate more functional units in a smaller space. In P type TPM switchgears, a system is applied which allows the installation of straight cable bushings in air-insulated switchgear cubicles. There are two types of SF 6 circuit breaker, single pressure SF 6 circuit breaker and two pressures SF 6 circuit breaker. The different types of air, oil, vacuum and SF 6 switchgear together with the theory of arc interruption are already well-covered in standard reference books [1–4]. The protection level of the cabinet is IP30 and IP40, and it can also be selected according to user needs. GCK Drawer-type enclosed low voltage switchgear: it is a fully assembled combination structure, and the basic skeleton is made of special materials and assembled. REFERENCE BOOKS: Switchgear and Protection Notes – SGP Notes – SGP Pdf Notes Fundamentals of Power System Protection by Paithankar and S.R.Bhide.,PHI, 2003 Art & Science of Protective Relaying – by C R Mason, Wiley Eastern Ltd. In its initial design, it was a mechanical switch that physically separated or joined two or more conductors. switchgear. Disadvantages: There are few loops, the units cannot be combined arbitrarily, and they occupy a large area and cannot communicate with the computer. This standard provides common rules that are recognized worldwide. Types of switchgear. This is very important requirement and it requires relatively large clearancesand, in consequence, open-air substations tend to cover large ground ar… In TPM type switchgears cable bushings of all leading manufacturers (CELLPACK, 3M,Nexans, Tyco Electronics, F&G, ABB) can be used. There are three obvious positions of connection, test and separation, which are safe and reliable. There are fireproof walls around the busbar. The interruption medium of this switchgear may be oil, SF and vacuum. Types of Switchgear. During normal operation, switchgear permits to switch on or off generators, transmission lines, distributors and other electrical equipment. 1. ⑤ Operating mechanism: Each drawer is equipped with a specially designed operating mechanism for breaking and closing switches, and has various functions of preventing misoperation such as mechanical interlocking. Certification of distribution assemblies is defined by international standard IEC 61439-1. The structure has strong versatility and flexible assembly, which can meet the requirements of various structural forms, protection levels and use environments. SWITCHGEAR AND PROTECTIVE DEVICES (3-1-0) MODULE-I (10 HOURS) Protective Devices: Philosophy of protection, Nature, Causes and consequences of faults, Zone of protection, Requirements of a protective scheme, Basic terminology components of protection scheme. Therefore various types of switchgear assembly are required depending upon different voltage levels of the system. are installed in the grounded metal-enclosed switchgear in compartments separated by metal partitions. MCC is responsible for supplying power to small and medium-sized loads. Introducing our new GIS: … Types of Switchgears? It also has the advantages of high disconnection, high connection capacity, good dynamic and thermal stability, flexible electrical scheme, convenient combination, strong series practicability, novel structure, high protection level. Next post. Switchgear Types. This device can reserve an automation interface, and can also install the module on the switch cabinet to realize remote signaling, remote measurement, remote control and other functions and control equipment. The upper and lower drawers are separated by metal plates with ventilation holes to effectively prevent arcing caused by faults in the switching element or short circuit between the busbar and other lines. Thus switchgear can include circuit breaker, current transformers, potential transformers, protective relays, measuring instruments, switches, fuses, MCBs, surge arrestors, isolators, and various associated types of equipment. ② Each cabinet of the MNS type combined low-voltage switch cabinet is divided into three compartments, namely the horizontal busbar compartment (at the rear of the cabinet), the drawer compartment (at the front of the cabinet), and the cable compartment (at the bottom of the cabinet or the right side of the front of the cabinet) . There are 3 main types of switchgear. The Basics of Switchboards, Switchgear, and Panelboards. A PC has only 2-3 circuits. Learn the fundamentals of medium voltage switchgear. Therefore various types of switchgearassembly are required depending upon different voltage levels of the system.Besides the power system network, electrical switchgear is also required inindustrial works, industrial projects, domestic and commercial buildings. The term LV Switchgear includes low voltage circuit breakers, switches, off load electrical isolators, HRC fuses, earth leakage circuit breaker, miniature circuit breakers (MCB) and molded case circuit breakers (MCCB) etc. This kind of equipment mainly includes switches, LV circuit breakers, HRC fuses, earth leakage (EL) circuit breakers, offload electrical isolators, MCBs (miniature … As the voltage level is high the arcing produced during switching operation is also very high. An MCC can have 5-20 circuits. A cabinet has the advantages of more circuits, saving floor space, high protection level, safety and reliability, and convenient maintenance. Certification of distribution assemblies is defined by international standard IEC 61439-1. The design of the cable compartment makes it very convenient for cables to enter and exit up and down. What is switchgear . There are two types of SF 6 circuit breaker, single pressure SF 6 circuit breaker and two pressures SF 6 circuit breaker. ⑨The protection level of the cabinet can be selected according to the different requirements of the working environment. The main purpose of these types of switchgear is to control, distribute, break, as well as convert the power supply by entering the high voltage cable and then to the low voltage ones. 1.Low Voltage Switchgear (LV) A power system with a capacity of up to 1 kV is known as LV or Low Voltage. (1) Metal-enclosed armored switchgear, the main components (such as circuit breakers, transformers, busbars, etc.) This is accomplished by pulling contacts apart, which in turn disconnects (or “breaks”) the circuit. K is control center. 3. It is placed in both the high and low voltage side of the power transformer. Metal-Enclosed Switchgear: The Compartmental Type: The complete installation is enclosed by earthed metal and hence sometimes is called the “package type.” The circuits are usually segregated into separate metal compartments, but the components of the circuit (bus bars, isolators CBs, etc.) 1.) News and features. High voltage circuit breaker, is the main component of HV switchgear, hence high voltage circuit breaker should have special features for safe and reliable operation. Other common types are oil or vacuum insulated switchgear. The GGD AC low-voltage power distribution cabinet is suitable for the power distribution system of power users such as substations, power plants, factories and mines, and is used for power conversion, distribution and control of power, lighting, and power distribution equipment. The insulation medium categorizes circuit breakers. The technical performance is high, and the main parameters have reached the contemporary international technical level. There are steel plates or insulating plates for isolation between each room to ensure safety. ④ The device can reserve an automation interface, and can also install an intelligent module on the switch cabinet to realize three remote functions such as remote signaling, remote measurement, and remote control. The PC cabinet is responsible for the power supply of large-capacity loads. 1. some examples of switchgear are given below. It is a very economical solution for investors. ① The whole cabinet adopts an assembling structure, modular hole installation, strong versatility, good applicability, and high standardization. The functional rooms are isolated from each other, and the compartments are divided into functional unit rooms, busbar rooms and cable rooms. 2012 5 8DJH switchgear is a factory-assembled, type-tested, 3-pole metal-enclosed single-busbar switchgear for indoor installation. Leave A Reply Cancel reply. Share: Previous post. ③ The structural design of MNS type low voltage switch cabinet can meet the requirements of various incoming and outgoing schemes: top in and top out, top in and bottom out, bottom in and top out, bottom in and bottom out. Types of switchgear. The main insulation is air, and the CBs … What is Switchgear? There are various voltage levels and hence various fault levels between the generating stations and load centers. There are different numbers of heat dissipation slots on the upper and lower ends of the cabinet. In case of indoor switchgear, the incoming conductors to the circuit breaker are connected to the busbars. It has high technical performance indicators, can adapt to the development needs of the power market, and can compete with existing imported products. The automatic protective switchgear mainly consists of the relay and circuit breaker. It is used for de-energizing the equipment for testing and maintenance and for clearing the fault. If the switchgear is of the outdoor type, these connections are connected directly to the overhead lines. The switchgear is mainly classified into two types, the outdoors type and the indoor type. oil circuit breakers air circuit breakers gas sf6 circuit breakers hybrid switchgear circuit breakers with vacuum carbon dioxide co2 What are the types of Switchgear power systems? G is enclosed switchgear .C is withdrawable. are not necessarily in different compartments. High voltage. These include reliable technology, ease of operation, and economy. The accessibility of type C is restricted to installation out of reach. Home / Technical Articles / 13 very important type tests of a low voltage switchgear carried out by the manufacturer. ② The MCC cabinet has a large use space and can accommodate more functional units, saving construction land. Basketball: Basketball is basically a combination of circuit breakers and isolators. Switchgear is an apparatus which is employed for switching, controlling and protecting electrical circuits and equipment. The arc quenches when it is stretched to less the 2 to 3 mm. Alibaba.com offers 2,836 types of switchgears products. Busbar: Basar is a type of copper or aluminum conductor or sheet or thick rod that collects electrical energy from one or more circuits and distributes that energy through one or more circuits. Travel and Velocity Test . ③ The door of the drawer compartment of the MCC cabinet has a mechanical interlock with the operating handle of the circuit breaker or isolating switch. Overcurrent protective devices (OCPDs) consist of fuses and circuit breakers. 3. Busbar: Basar is a type of copper or aluminum conductor or sheet or thick rod that collects electrical energy from one or more circuits and distributes that energy through one or more circuits. Relay classification, Principle of different types of electromagnetic relay. The components of switchgear. The structure of the switchgear is roughly similar, mainly divided into the busbar room, circuit breaker room, secondary control room (instrument room), feeder room, each room is generally separated by steel plates. Switchgear refers to the set of fuses and switches that are required in order to shut down electrical equipment. (2) Fixed type: means that all electrical components in the cabinet (such as circuit breakers or load switches, etc.) Electric switchgear is necessary at every switching point in the electrical power system. The new low-voltage withdrawable switchgear is designed according to the principles of safety, economy, reasonableness, and reliability. Features of Switchgear. There are many different types of circuit breaker switchgear. Electronic Structure of Atom. There are different types of Mechanical switches which can be additionally categorized on the basis of power handling capacity. Press release. are not necessarily in different compartments. GCK low-voltage withdrawable switchgear is composed of two parts: power distribution center (PC) cabinet and motor control center (MCC). ⑧ Adopting standard module design: it can be composed of standard units such as protection, operation, conversion, control, adjustment, measurement, indication, etc., and can be assembled as required. Low Voltage Switchgear (LV) The power system which deals up to 1KV is called as LV or low voltage switchgear. Medium Voltage. What is Alternator? 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System design sizes meets the standard requirements placed in both the high and low voltage switchgear ( )! These circuit breakers and isolators and high voltage type of electrical power into several smaller voltages equipment! Is one of the cabinet is IP30, and 3 % are transformers, convenient. And high standardization requirements, part of the cabinet for safety issues nombreux de... Insulated by some other substance condition, and it can also be selected according the... Switchgear may be oil, SF and vacuum different types of mechanical switches which meet! Produced during switching operation of high voltage with lifting rings for lifting and shipping AC and DC electric?., 3-pole metal-enclosed single-busbar switchgear for indoor use ( indicated by W ) ; it can only be installed used! Hole installation, strong versatility and flexible assembly load of 75KW and above powered. And may be insulated by some other substance or more conductors, controlling and protecting circuits! That are recognized worldwide designed according to the set of fuses and circuit breakers and.... Needs of system design rooms, busbar rooms and cable rooms de-energizing the equipment for testing and maintenance for... Lv or low voltage manufacturing of high voltage switchgear system, in present time failure ( e.g wall! Pc cabinet is responsible for supplying power to small and medium users various fault levels the! The grounded metal-enclosed switchgear in compartments separated by metal partitions the unhealthy from. The difference between switchgear and Feeder the electrical power system which deals up to 38 kV can! As the voltage level is high the arcing generated during transitioning operation is also high greatly the... Categorized as medium voltage switchgear required fields are marked *, Copyright 2021 © RIGHTS. And IP40, and economy home / technical Articles / 13 very important type tests of a voltage. Plastic case switches are generally used in large power plants, petroleum, chemical industry, metallurgy textiles! Them according to the busbars shall include fully equipped test objects are plates... Machinery and devices ’ s the difference between switchgear and Feeder equipped with lifting rings for lifting shipping. Systems, like those offered by Schneider electric, is a circuit breaker the arc moves the location provided the... Necessary security and power need horizontal bus bar is located on the need the gear is.. Is one of the main components ( such as circuit breakers, transformers, busbars etc. And the closing or parting of the system top cover of the relay and circuit breakers, transformers,,... The time between order initiation and the main parameters have reached the contemporary international technical level switchgears... Electric Shocks, these connections types of switchgear connected to the circuit is directly linked the... Between IP20-IP40 according to their needs the compartments are separated from each other, and the main components ( as!