The circuit breaker poles contain sf6 at a pressure of 380 kpa for 36kv application and 550kpa for 40. For circuit breaker with sf6 gas, a temperature compensated gas density monitor with gas pressure gauge and pressure switch shall be provided at a convenient place to indicate sf6 gas density and gas pressure. They are specifically designed and tested for general or definite purpose applications as well as for severe environmental conditions including low temperature, highly active seismic areas and regions with high pollution levels or corrosive atmospheres. These breakers have interrupting ratings from 25 ka to 80 ka. Sf6 properties, and use in mv and hv switchgear ect 188 updated february 2003 d. Lf circuit breakers use the sf6 gas self expansion technique. Siemens highvoltage circuit breakers, regardless of type or voltage range, are designed in a well proven modular platform concept. Sf6 and vacuum switchgear enjoy varying market success in the different parts of the world figure 1 whereas europe and most of the middle east countries tend to favor sf6, china, japan and the usa definitely prefer vacuum. By means of the special spring catches, hook the ropes to the circuit breaker. The oil is both acts as an arc extinguishing medium and as an insulator between the live part and earth.
Sf6 has a number of advantages for use as an insulator. Iec indoor sf6 gas circuit breaker hd4 superior performance for smooth protection hd4 breakers are used in electrical distribution for control and protection of cables, overhead lines, transformer and distribution substations, motors, transformers, generators and capacitor banks. These procedures normally consist of removing the sf6 from the circuit breaker, filtering and storing it in a gas cart as a liquid, and transferring it back to the circuit breaker after the circuit breaker maintenance has been performed. Sf 6 breaker 800 kv sf 6 gas circuit breakers gcb for outdoor use from 24 kv to 800 kv cgl is the only manufacturer in india for supply of 420kv sf 6 circuit breakers to meet the high altitude requirement of 1600m. For a few years, sf6 has been recognized as a greenhouse gas 1. Dead tank circuit breaker 245 kv high performance breaker with highest short circuit breaking current a complete range of dead tank breakers at 245 kv provide options for applications with higher than standard asymmetry requirements xr ratio and offers the highest short circuit capacity in the industry at 90 ka. The dt1145 and the dt1170 are dead tank circuit breakers suitable for application at 170 kv and below. What is the procedure of testing a sf6 circuit breaker.
The breakers have a smaller footprint, so they use less real estate which can be very expensive. Circuit breaker for rating 145kv shall be suitable for gang operated three phase auto reclosing. Evaluates sf6 gas equipmentassets and schedules the repair and replacement of. The dielectric strength of sf6 increases with pressure so smaller breakers can be used at higher voltages. The sulphur hexafluoride gas sf6 is an electronegative gas and has a strong tendency to absorb free electrons.
In enclosed areas, such as in powerplants, it can displace breathable air. Vianna and others published sf6 gas circuit breakers reliability estimation, considering likely wear points. Due to high electronegativity, it absorbs free electrons which are produced due to arcing between contacts of circuit breaker. It consists of current carrying contacts enclosed in a strong, weathertight earth metal tank and the tank is filled with transformer oil.
Sf 6 circuit breakers are made from 72550kv with interruption current of 20 to 63 ka and rated current of 1,200 to 12000 amps because of the properties of sf 6 gas such as excellent arc quenching, high electronegative nature, and excellent dielectric strength sf 6 circuit breakers are popular for high voltage applications and above. Service retrofit solutions for abb sf6 gas sfa circuit breaker. Developed the ems and sf6 gas evaluates sf6 gas equipmentassets management procedures. Advantages over other media include lower operating noise and no emission. Thanks to the sf6 autopuffer breaking technique, the hd4 circuit breakers do not generate operating overvoltages, and are therefore also highly suitable for. Some of the advantages of sf6 circuit breakers, their. Sulpher hexafluoride or sf 6 circuit breaker is most popular and widely used breaker. Because of the absorption of free electrons and low mobility of ions sf6 has.
The procedures for handling nonfaulted sf6 are well covered in manufacturers instruction books. Rmag dead tank vacuum magnetic circuit breaker, instruction manual 15. Explore our dedicated panel builder offers to find your most appropriate solution in the mediumvoltage market. Click here to go to sf6 gas test and handling sub page handheld circuit breaker timing analyzer with first trip analysis function. Be sure the circuit breaker and its mechanism are disconnected from all electric power, both high voltage and control voltage, before it is inspected or repaired. The gas circuit breaker department includes general purpose, definite purpose, and synchronous switching circuit breakers. Pdf in this paper, we propose a new intelligent operation concept for high voltage sf6 gas circuit breakers, in which the moving contacts are selfadaptively controlled from one position first sf6 circuit breaker. Pdf sf6 gas circuit breakers reliability estimation, considering.
Sf6 circuit breakers are manufactured at two locations. Abb sf6 installation and maintenance instructions manual pdf. Sf 6 gas has many superior properties which makes it perfect for arc quenching. To ensure the integrity of sf6 gas as an insulator, the amount of water vapor in sf6 gas should be kept to a minimum. Vianna and others published sf6 gas circuit breakers reliability estimation, considering likely wear points find, read and cite all the research you need on. Dead tank circuit breaker 245 kv airinsulated switchgear abb. Sf6 circuit breaker advantages disadvantages applications. Inspection and maintenance frequency depends on installation, site, weather, and atmospheric conditions, experience or operating personnel, and special operation requirements. Aug 17, 2017 a circuit breaker in which the current carrying contacts operate in sulfur hexafluoride or sf6 gas is known as sf6 circuit breaker. Sf6 gas the universal technology 2 for medium voltage the switchgear manufacturers gas 3 breaking technique autocompression technique 4 operating 5 general a highperformance 6 and reliable range certified quality.
In sf6 circuit breakers, sulphur hexafluoride sf6 gas is used as the arc quenching medium. The circuitbreaker poles contain sf6 at a pressure of 380 kpa for 36kv application and 550kpa for 40. Sulphur hexafluoride sf6 circuit breaker a circuit breaker in which sf 6 under pressure gas is used to extinguish the arc is called sf 6 circuit breaker. The toxic byproducts released when sf6 gas interrupts the arc plasma in a circuit breaker are also of concern. Technical specification of 2 kv sf6 circuit breaker special instructions to bidder please read following instructions carefully before submitting your bid. Nov 20, 2017 various routine tests are performed for ensuring the quality, performance of a circuit breaker and these are 1. Sf6 gas or sulfur hexafluoride gas properties electrical4u. Our indoor vacuum circuit breakers and sf6 circuit breakers are essential for safe and reliable power.
This technique is the result of many years experience in sf6 technology and major research work. He joined the same year merlin gerin group, in hv transmission. Pdf electrical strength analysis of sf6 gas circuit breaker element. Iec outdoor sf6 gas circuit breaker ohb outdoor circuit breakers. By means of the special spring catches, hook the ropes to the circuit breaker hook to the special anchoring points provided in the structure and lift. This location serves as the center for gas circuit. Sf6 is a very good dielectric material which can resist high potentials. Introduction sulfur hexafluoride circuit breakers protect electrical power stations and distribution systems by interrupting electric currents, when tripped by. Sf 6 gas has excellent insulating property and it has a high electronegativity. Provides easy profile of breaker contact timing as. Rather, under reduced gas pressure, the capacity of a circuit breaker to interrupt is diminished and a likewise similar condition for the dielectric strength. Gas circuit breaker gcb products range is as follow.
Sf 6 gas circuit breakers gcb business edge business edge the switchgear works of crompton greaves is located on a 1,32,540 sq. In double pressure type sf6 circuit breaker, the gas from the highpressure system is released into the lowpressure system through a nozzle, during the arc extinction processes. All of our breakers are thoroughly tested in stateoftheart facilities, including the high voltage lab, high power lab, environmental test lab, and seismic. In sulpher hexafluoride or sf6 circuit breaker, sulpher hexafluoride sf 6 gas is used as an insulating and arc quenching medium. E outdoor sf6 circuitbreaker gi schneider electric documents. Brochure ohb outdoor live tank sf6 circuit breaker english pdf brochure instruction for installation. For maintenance of circuit breaker or circuit breaker maintenance, it must be first switched off and then isolated from both sides by opening concerned electrical isolator. Abb library is a web tool for searching for documents related. Exhaust the pressure from air receiver of any compressed air circuit breaker before it is inspected or re paired. Additionally, the move away from sf6 help us comply with sf6 leak rate legal requirements, as well as help eliminate the hazardous waste costs associated with the gas.
Iso 9001 7 electrical characteristics 8 description sf1 circuit breaker 10 sfset circuit breaker 11 sf2, isf2, circuit breaker 12. The sf6 gas circuit breaker gcb products range is as follow. Sf6 circuit breakers construction, types and working. Our circuit breakers bring peace of mind to switchgear panel builders and users in any mv application, whatever your business. Iec live tank sf6 mechanical circuit breaker rmerge obsolete iec live tank sf6 mechanical circuit. Sf6 gas is used as the arc quenching medium sulfur hexafluoride sf6 is an electronegative gas and has a strong tendency to absorb free electrons. The contacts of the breaker are opened in a highpressure flow of sf6 gas and an arc is struck between them. Maintenance matters hints for maintenance siemens tcp highvoltage sf6 power circuit breaker thorough, periodic inspection is important to satisfactory operation. Jan 02, 2014 sf6 circuit breakers are made from 72550kv with interruption current of 20 to 63 ka and rated current of 1,200 to 12000 amps. Purpose share status on replacement of sf6 with environmentally friendly insulating gas for high voltage gis and breakers. In an sf6 circuit breaker, sulphur hexafluoride gas is used as the arc quenching medium the sulphur hexafluoride gas sf6 is an electronegative gas and has a strong tendency to absorb free electrons. At this no isolated condition the circuit breaker must be operated for local and remote condition yearly and when required.
Dec 17, 2018 in this video you can learn about types of sf6 circuit breakers, constructions of sf6 circuit breakers and working of sf6 circuit breakers with highly animated video, sf6 circuit breaker operation. Decomposition products in the form of metallic fluoride powder are toxic to. The reports indicate a potential trend with respect to a. Iec outdoor sf6 gas circuit breaker ohb outdoor circuit. Sf 6 sulphur hexafluoride gas has excellent dielectric, arc quenching, chemical and other physical properties which have proved its superiority over other arc quenching mediums such as oil or air. Various routine tests are performed for ensuring the quality, performance of a circuit breaker and these are 1. Pdf electrical strength analysis of sf6 gas circuit breaker. By means of the special spring catches, hook the ropes to the circuitbreaker. This twoday course is a handson way to learn how to reduce. A sf6 puffer type breaker compresses a bellows when opening, directing sf6 gas across the parting contacts to extinguish the arc. In this video you can learn about types of sf6 circuit breakers, constructions of sf6 circuit breakers and working of sf6 circuit breakers with. A circuit breaker in which sulphur hexafluoride gas or sf 6 gas is used as the arc quinching medium, known as an sf6 circuit breaker.
The sf 6 gas circuit breaker gcb products range is as follow. Gain knowledge of circuit breakers internal health through sample gas testing follow epa, carb, and rggi reporting rules training training on proper sf6 gas handling procedures is essential to switchgear life extension and maintaining switchgear effectiveness. Instead of an objective selection based on realworld characteristics, the choice is very much driven by the circuit breaker manufacturer. Abb library is a web tool for searching for documents related to abb products and services. The types of sf6 circuit breakers can be broadly identified as. Accordingly, many initiatives have been taken to evaluate the impact of sf6 circuit breaker.
It combines the effect of thermal expansion with a rotating arc to create arc. Dielectric test on auxiliary circuit and control circuit 3. A circuit breaker in which sf6 under pressure gas is used to extinguish the arc is called sf6 circuit breaker. The circuit breaker should be operated electrically from local and remote then mechanically. We quickly realized that, as the breaker approached the magic alarm set point, the functionality of the circuit breaker didnt vanish. Meppi is located in warrendale, pennsylvania, a suburb of pittsburgh. Sf6 gas and gas byproducts pose some risk to personnel. In iec it is considered to be ais if the capacitance of the liaison between circuit breaker and a line is less than 1. This leads to a wide variety of circuit breaker types and strong flexibility with regard to various applications according to our customers requirements.
Due to high electronegativity, it has a high affinity for absorbing free electrons. Marine pollution control developed work practices for the gas equipment. Sulfur hexafluoride circuit breakers protect electrical power stations and distribution systems by interrupting electric currents, when tripped by a protective relay. The sf6 is an electronegative gas and has a strong tendency to absorb free electrons. At merlin gerin, the research work, concerning the use of sf6 gas for. Sf6 properties, and use in mv and hv switchgear studiecd. Kokin ural federal university named after the first. Combination of free electrons with molecules produces heavy and big ions, which have very low mobility. Cg is proud to be a part of the usd 4 billion avantha group, a reputed indian industrial conglomerate led.
Iec outdoor gas insulated sf6 circuit breaker ohb medium voltage circuit breaker with mechanical operating mechanism designed for distribution systems up to 40. The gie circuit breaker is a sf6 gas circuit breaker suitable for outdoor installation in electricity distribution networks with rated voltage up to 40. Cold weather operating problems with sf6 circuit breakers. View and download abb sf6 installation and maintenance instructions manual online. Electrical strength analysis of sf6 gas circuit breaker element daniil a. Because of the properties of sf6 gas such as excellent arc quenching, high electronegative nature, and excellent. Our power circuit breakers cover a full range of voltages from 15 kv class to 550 kv and developments are underway at 800 kv. Pdf sf6 gas circuit breakers reliability estimation.
This type of breaker is mostly used for ehv systems like 220 kv, 400 kv and 765 kv. After the circuit breaker has been disconnected from the. Sf6 circuit breaker types and operation of sf6 circuit. Jan 02, 2019 a circuit breaker in which sulphur hexafluoride gas or sf 6 gas is used as the arc quinching medium, known as an sf6 circuit breaker.