It should be made only after the dc insulation resistance measurement test has been passed satisfactorily and all cleanup has been finished. The following is a list of comprehensive circuit breaker tests recommended for use on all circuit breaker types except as indicated. This testing molded case circuit breakers is time consuming and can take up to eight hours especially considering the test time alone can be two hours. The aim of this research work is to propose a test circuit for performing indirect test. Circuit breaker testing is used to test both the performance of individual switching mechanisms and the timing of the overall tripping system.
The wl circuit breaker ships from the factory with the lowest possible settings. Oscilogram is obtained from shortcircuit tests of circuit breakers at laboratory. You test and maintain breakers so you know they can and will perform when they are needed. Circuit breaker reliability, test standards, procedures. The circuit breaker should be visually checked for language and data on the templates, proper identification mark of any auxiliary equipment, color and quality of paint and corrosion on metallic surface, etc mechanical operation test. X x x bl90 ab0081ee ziab03e circuit breaker testing accessories 11. Pdf the optimum tests for high voltage sf6 circuit breaker in. The application of type testing to retrofit circuit breakers. Completely read each procedure while looking at the actual parts before beginning. We use state of the art digitally controlled current.
A common ul489 test of circuit breakers exposes the breaker to 5% of its rated current. Circuit breaker testing is essential to ensure the safe and reliable performance of this key link in the power asset chain. With such a diverse product offering, megger is the single source for electrical test and measuring instruments. Highvoltage circuit breakers are mechanical switching devices which connect and break current. Circuit breaker testing and maintenance solutions doble. Take precautions and observe safety procedures before servicing the breaker or equipment. Maintenance and inspection procedures can include any or all of the following. Various routine tests are performed for ensuring the quality, performance of a circuit breaker and these are 1. For exisiting circuit breaker installations, it is important to notice and take record of all customer settings of the circuit breaker before performing any testing. F testing of instantaneous only molded case breakers. Discover the many ways doble can support your circuit breaker testing and maintenance program. In order to ensure the proper operation of a circuit breaker throughout its lifetime, diagnostic tests are performed, such as resistance, timing. This testing should be performed per neta and nema procedures in accordance with manufacturers recommendations. Pdf its high cost to design and manufacture high voltage substation that may be fail service at any small fault.
Often, the breaker has to perform its duty within some tens of milliseconds, after months, perhaps years of idly being in circuit since rcm reliability centered maintenance and condition based maintenance have become the established strategies for most owners and. Perform all mechanical operator and contact alignment tests on both the breaker. When these tests are performed at a factory or repair facility, current is injected into all three poles of a circuit breaker at the same time. A key requirement was that in addition to the automated process, the tester also needed the ability to be paused at set intervals for a trained technician or engineer to make additional manual measurements. Airbreak circuit breakers replaced oilfilled units for indoor applications, but are now themselves being replaced by vacuum circuit breakers up to about 40. As the last protection level for terminal devices, thermomagnetic. Verify that primary and secondary contact wipe and other dimensions vital.
Circuit breakers are the first line of defense in case something goes wrong with a system. However, our testing solutions have revolutionized circuit breaker testing. Ac hipot test this test should be conducted separately for circuit breakers and switchgear buses stationary gear. It is only in the event of a short circuit in a terminal device that they switch off to protect the power supply line against an overload. Circuit breaker testing manual high voltage circuit. However, as these units work from cts and logic systems and heat does not play the same role in these, therefore the procedure can vary. A circuit breaker is an important device that helps in protecting the electrical appliances at home from voltage spikes. Prior to cleaning the unit, perform asfound tests, if required. The purpose of performing doble tests is to detect the presence of contamination andor deterioration of the breakers insulating system. The testing solutions we offer include systems that can supply power during the testing process and are capable of measuring the microohm resistance across the closed. Circuit breaker testing rans electrical high voltage. These are all hallmarks of meggers circuit breaker testing solutions such as the tm1700 and tm1800 test instruments, the egil test set, and caba win software program.
Pdf mv switchgear circuit breaker inspection and test procedure find, read and cite all the research you need on. High voltage, test circuit breaker, timing test, contact resistance test, gas sf6 analyzer test, gas leakage test and high voltage test. The circuit breaker must be smoothly operated at maximum as well as minimum allowable auxiliary and control circuit supply voltage. The kit includes the signal condition ing unit sca606, the software caba win vibration and one vibration channel. The tm1800 circuit breaker testing set is the instrument platform for circuit breaker maintenance, based on more than 20 years experience of over 4,000 delivered breaker analyzers. Test the switch determine whether the breaker is in the on or off position. Abb low voltage service air circuit breaker maintenance. Pdf highvoltage circuit breakers play an important role in transmission and. The modular construction makes it possible to configure the tm1800.
What is the procedure of testing a sf6 circuit breaker. In this video, learn about the components of a circuit breaker, different breaker technologies, and the various breaker testing methods. Dielectric test on auxiliary circuit and control circuit 3. Testing of circuit breaker testing of circuit breakers is more difficult as compared to other electrical equipment like transformer or machine because the short circuit current is very large.
Guidelines for hv circuit breaker function and test. 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. In this paper, digital testing is applied to determine the critical line length, i. A systematic approach to highvoltage circuit breaker testing. They have a high switching capacity of 6 ka or more. These settings should be restored at the conclusion of all inspection and testing. This completes the procedure of circuit breaker replacement. Open the electrical box open the circuit breaker box and locate the switch that corresponds to the area you want to test. A circuit breaker manufacturer needed an automated test application to perform endurance testing of their breakers figure 1. For example, the changing state of main and resistor contacts open close, closeopen, etc. Digital testing of highvoltage circuit breakers request pdf. The megger product offering spans 30 distinct product groups with over 1,000 specific products.
R ecommended test voltages for proof testing and eld testing mediumvoltage power circuit breakers and s witchgear can be found in t able 100. Medium voltage circuit breakers rated between 1 and 72 kv may be assembled into metalenclosed switchgear line ups for indoor use, or may be individual components installed outdoors in a substation. Inspect moving and stationary contacts for condition, wear, and alignment. Industrial electrical testing, circuit breaker testing.
Circuit breakers the proper functioning of a circuit breaker is reliant on a number of individual components, including the interrupter, the operating mechanism, and the auxiliary contacts and coils, which have to be tested at regular intervals. Megger is happy to help you select the right product to meet your circuit breaker testing requirements. Verify the control circuit check motion of the moving parts validate time of operation verify manufacturer specs determine contact wear demonstrate results of maintenance assess overall breaker capability. The above article provides information regarding the process of circuit breaker testing, something which is an important aspect of electrical safety. Basic knowledge for protection in the event of overload. A circuit breaker is an automatically operated electrical switch designed to. Circuit breaker tester selection is a complex process as the tests vary between each type of circuit breaker. Frequently asked high voltage circuit breaker testing. Travel measurements are a very valuable tool in circuit breaker analysis. Yet, under normal conditions, a breaker may only be in operation for less than ten minutes throughout its life. The vibration solution can be extended up to 6 channels. Circuit breaker test equipment for network reliability. Circuit breaker type testing the series of type testing required for general purpose medium voltage indoor circuit breakers is prescribed in iecbsen 62271100. Breaker pole, mechanical and electrical assembling tests are also conducted on major modules of the circuit breaker during the factory assembly process, prior to the final routine testing of the complete circuit breaker poles and operating mechanisms.
The following test procedures are those required to test bulk oil circuit breakers ocb and sf6 dead tank circuit. Thoroughly understand what is to be done and follow the procedure step by step. Operate the network process is applicable at all times for isolation and earthing. In the laboratory, a test circuit is set up that matches the real network as. The optimum tests for high voltage sf6 circuit breaker in the.
The ac test will stress the switchgear insulation similarly to the stresses found during operating conditions. Circuit breakers electrical test equipment from megger. Weve assembled helpful technical guides on circuit breaker testing from leading manufacturers in the field. The method for the testing of the solid state units are the same. Details of specialised circuit breaker tests are not included in this. The following tests would normally be expected to be performed on a breaker in its cubicle for a new development, dielectric testing i. G u ide f or prim ar y in jec t ione tst i ng w l circu it. E testing of molded case breaker with solid state trip. Turn off or unplug the electric devices in the area to avoid a power surge. Pdf digital testing of highvoltage sf6 circuit breakers. Second generation testing methods based on digital timers with timepulse conversion e. One of the common arguments against measuring motion on vacuum cbs is that the contact stroke is so short that you are better off measuring stroke with a pair of calipers when the breaker is in fully open position compared to fully closed position and you can verify the cb is traveling fast enough from the contact times. With central elements such as busbars, disconnectors and circuit breakers, switchgears represent the hubs of electrical energy grids.
Very interesting are also new conceptions for testing of circuitbreakers based on analysis of mechanical vibration signal 2. Fundamentals of circuit breaker maintenance avo training. Reasons for testing contd performing timing tests is the best way to. Gasinsulated switchgear gis is a spacesaving alternative to classic outdoor switchgear. A legacy of innovation meggers circuit breaker test solutions highlight our legacy of innovation and reveal our focus on safety, reliability and testing efficiency. Circuit breaker testing swp page 4 of 6 standard work practice sp0509 ver 3 ergon energy corporation limited abn 50 087 646 062 a, b and c refer to one set of cb high voltage terminals eg fixed contact top of cb and a, b, and c refer to the other set of. The procedure for performing impulse voltage tests must therefore allow for a few disruptive discharges in a way that does not erroneously consider them as evidence of failure in the test. This is true for all types of circuit breakers, including those with sf6 as an insulation medium. The breaker is the active link that ultimately has the role of quickly opening the primary circuit when a fault occurs. Please call our technical support group who are waiting to assist you. Circuit breaker testing circuit breaker fault youtube. Maintenance procedures for mediumvoltage vacuum circuit.