Therefore the antipump relay prevents the spring from doing the following. Why test circuit breakers some of the most important of the many reasons for test ing circuit breakers are to ensure they. Sf6 leak rates from high voltage circuit breakers u. Quality sf6 circuit breaker timing similar measurements to offline testing. Dielectric test on auxiliary circuit and control circuit 3. This course covers all elements of routine sf6 circuit breaker. So it has far superior arc quenching properties than any other medium oil in oil cb, sf6 in sf6 circuit breaker for example, when contacts of a breaker are opened in the vacuum, the interruption occurs at first current zero with dielectric strength between the contacts building up at a rate thousands of times higher than that. Optimized solutions for the main circuit breaker testing requirements. Slf testing has been applied as this is one of the most severe faults for a circuit breaker to interrupt. During operation of sf6 circuit breaker, this highly compressed gas is released through the arc in the breaker and collected to a relatively lowpressure.
Pdf the optimum tests for high voltage sf6 circuit breaker. Rated short circuit breaking current 40 ka rated shorttime current up to 3 s 40 ka leakage rate per year circuit breaker spring rated operating sequence oco15sco interrupter technology vacuum insulation medium clean air bay width common pole drive 34 bay height, depth typical 106 x 18 bay weight. Sf6 circuit breakers ranges from 33kv to more than 800kv due to the strength and flexibility of sf6 gas. Due to high electronegativity, it has a high affinity for absorbing free electrons. Sf6 circuit breaker type and the optimal tests for the high voltage circuit breaker timing test, contact resistance test, gas sf6 analyzer test, gas leakage test and. Mccb moulded case circuit breaker is one example of acb 500 a 600 v circuit breaker testing guide sf6 sulphur hexafluoride sf6 is an inert, heavy gas having good dielectric and arc extinguishing properties. Reclosing the breaker after the breaker has opened. Rmag dead tank vacuum magnetic circuit breaker, instruction manual 15. An arc quenching for a default current of 50 ka, 245. The optimum tests for high voltage sf6 circuit breaker in the new substation before energize with the national grid article pdf available december 2015 with 1,854 reads how we measure reads. Mar 14, 2017 primary current testing is conducted by injecting a programmed sequence of overload and fault magnitude currents through a circuit breaker and documenting how long it takes the trip unit to activate. A microohmmeter is applied to the closed contacts of the vi and the resistance is measured and recorded. The optimum tests for high voltage sf6 circuit breaker in the new substation before energize with the national grid article pdf available december. All of our breakers are thoroughly tested in stateoftheart facilities, including the high voltage lab, high power lab, environmental test lab, and seismic.
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. Gain knowledge of circuit breaker s 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. Taylor, icf consulting abstractthis paper highlights a recent collaborative study between the epas sf6 emission reduction. Epa investigates potential greenhouse gas emissions source j. Instead of oil, air, or a vacuum, a sulfur hexafluoride circuit breaker uses sulfur hexafluoride sf 6 gas to cool and quench the arc on opening a circuit. In an sf6 circuit breaker, sulphur hexafluoride gas is used as the arc quenching medium. 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. Bulk oil circuit breakers are primarily used in north america in hv applications, while the rest of the. Routine trip testing should be performed every 3 to 5 years. The sulphur hexafluoride gas sf6 is an electronegative gas and has a strong tendency to absorb free electrons. Rated shortcircuit breaking current 40 ka rated shorttime current up to 3 s 40 ka leakage rate per year 6 fittings kit. A systematic approach to highvoltage circuit breaker testing. The working of sf6 cb of first generation was quite simple and it is some extent similar to air blast circuit breaker. Advantages over other media include lower operating noise and no.
Digital testing as described in this thesis can take three forms. Inspection, testing and commissioning of electrical. The breakers have a smaller footprint, so they use less real estate which can be very expensive. This presentation will explain the importance and procedure for testing sf6 type circuit breakers.
Sf6 ate 36 kv 2500 a 25 ka sf6 circuit breaker up to 36 kv 2500 a 25 ka. Sf6 equipment maintenance, repair, and replacement and. The testing and maintenance training part of the course will discuss application, installation, maintenance and testing issues related to low, medium and highvoltage switchgear and. Circuit breaker maintenance training electricity forum. Depending upon the application, type sfm gcbs are divided into two types as follows.
Shortcircuit tests are used for verification of circuit breaker ability to limit the size of current which is set at testing circuit. Diflu is a threephase circuit breaker that uses sf6 dual flow puffer. The purpose of performing doble tests is to detect the presence of contamination andor deterioration of the breakers insulating system. The sf 6 gas circuit breaker gcb products range is as follow. Sf6 has a number of advantages for use as an insulator. General cb function besides conducting and interrupting operating currents, the cb is designed to break fault currents, e. Let us discuss one common example of one minute dry power frequency voltage withstand test of sf6 circuit breaker. 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. Circuit breaker operational testing and management of sf 6 gas are key aspects in maintaining circuit breakers to help ensure reliable operation. For more information, contact your local marketing representative at 7246960. The power frequency voltages, applied to the breaker during the test, are specified in the standard as per the nominal voltage level of the system. The dielectric strength of sf6 increases with pressure so smaller breakers can be used at higher voltages. Iec indoor secondary gasvacuum multifunction apparatus hysec.
Primary current testing is conducted by injecting a programmed sequence of overload and fault magnitude currents through a circuit breaker and documenting how long it takes the trip unit to activate. Sf6 circuit breakers construction, types and working. This is true for all types of circuit breakers, including those with sf6 as an insulation medium. Pdf the optimum tests for high voltage sf6 circuit. Power factor testing of circuit breakers electricity. Technical specification of 2 kv sf6 circuit breaker special instructions to bidder please read following instructions carefully before submitting your bid. These breakers have interrupting ratings from 25 ka to 80 ka. Pdf the optimum tests for high voltage sf6 circuit breaker in. Sulfur hexafluoride circuit breakers protect electrical power stations and distribution systems by interrupting electric currents, when tripped by a protective relay. Testing of circuit breaker circuit breaker areva sf6 gas circuit breaker power circuit breaker circuit breaker design air circuit breaker maintenance areva circuit breaker sf6 design parameter for circuit. In the mv circuit breaker field, for example, on more than 20 000 sf6 switchgear units installed by the french electrical utility edf, the annual fault rate related to seal problems is less than 0. They are very reliable and require less maintenance than air blast or oil breakers and. This circuit breaker in a grounded tank called a dead tank, could interrupt 41. Nov 20, 2017 various routine tests are performed for ensuring the quality, performance of a circuit breaker and these are 1.
Aug, 2018 the test is performed in dry conditions of the breaker. Hv circuit breaker type generator circuit breaker fkga8 generator circuit breaker i sc 210 ka u r 33 kv sf 6 circuit breaker designed for power plants from 700 to 1,500 mw it is equipped with a springoperated mechanism per pole. The purpose of doble testing, or power factor testing, sf6 sulfur hexafluoride circuit breakers is to detect the presence of contamination andor deterioration of the breakers insulating system. The optimum tests for high voltage sf6 circuit breaker in the. Download as ppt, pdf, txt or read online from scribd. The dielectric strength of the gas increases with pressure. Sf6 circuit breakers type hb operating mechanism khb english pdf manual sf6 circuit breaker type hc extinguishing unit english pdf manual sf6 circuit breaker type hc operating mechanism english pdf manual oil circuit breaker sbk 12 k 250, sbk 24 k 500 english pdf manual. Circuit breaker design dead tank breaker breaking element w mf3a cross section. Sf6 gas handling for high voltage over vac equipment iec 60376. The following disadvantages of sf6 circuit breaker have nothing to do with the performance of the device itself but with the gas classification and type of the device only. Various routine tests are performed for ensuring the quality, performance of a circuit breaker and these are 1. Our power circuit breakers cover a full range of voltages from 15 kv class to 550 kv and developments are underway at 800 kv. 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. Specification of technical grade sulfur hexafluoride sf6 for use in electrical equipment other common reference standards.
This twoday course is a handson way to learn how to reduce. Vacuum circuit breakers testing methods switchgear content. The procedures for handling nonfaulted sf6 are well covered in manufacturers instruction books. Earthing, cable testing trucks and shutter lifting. Detecting contamination and deterioration in sf6 breakers to ensure longevity. Guidelines for the checking and treatment of sulfur hexafluoride sf6 taken from electrical equipment and specification. Circuit breakers to meet the high altitude requirement of 1600m. This interactive 4day course focuses on theoretical background with practical field experience to provide. Pdf highvoltage circuit breakers play an important role in transmission and distribution systems. When vacuum interrupters are manufactured or used in field there are three tests used to validate their function. Here sf6 gas was compressed and stored in a highpressure reservoir. Routine maintenance tests enable personnel to determine if breakers are able to perform their basic circuit protective functions. Sf6 circuit breaker types and operation of sf6 circuit.
English pdf manual sf6 circuit breaker type hc operating mechanism english pdf manual oil circuit breaker sbk 12 k 250, sbk 24 k 500 english pdf manual. 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. The contacts of the breaker are opened in a highpressure flow sulphur hexafluoride sf6 gas and an arc is struck between them. Pdf digital testing of highvoltage sf6 circuit breakers. Whether it is a new circuit breaker installation, gas testing and analysis, maintenance, or decommissioning, every service technician is instantly safer and more efficient when they are properly equipped with abbs universal sf 6 fittings kit. All instructions in this manual assume the customer has taken the above. This performance was already significant, but the three chambers per pole and the highpressure source needed for the blast 1. 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. 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. Case in point, dead tank sf6 filled circuit breakers and. 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.
Vacuum circuit breaker vcb principle, construction and. Instead of an objective selection based on realworld characteristics, the choice is very much driven by the circuitbreaker manufacturer. A three phase auto reclosing circuit breaker with one common. Also included is an explanation of how to analyze test results and several test case studies illustrating various problems detected by doble testing. If the circuit remains complete, the closing spring would discharge under the wrong conditions, this is called pumping. 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. Sf 6 gas circuit breakers gcb business edge business edge the switchgear works of crompton greaves is located on a 1,32,540 sq. A test should also be made between the line and load terminals. What is the procedure of testing a sf6 circuit breaker. The circuit breaker must be removed from its cell and isolated from the high voltage. Instead of an objective selection based on realworld characteristics, the choice is very much driven by the circuit breaker manufacturer.
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