Dec 21, 2016 this is the first of a series of videos on our 3 phase transformer test 2. There are four possible connections for a 3 phase transformer bank. These motors run conveyor belts, pumps, fans, and many other applications. Three phase power is used almost exclusively for generation, transmission, and distribution, as well as for all industrial uses. Complete tests 1 and 2 for each winding of a threephase transformer individually with the remaining windings kept open.
The device provides a wide functionality, which can be extended further by means of optional components. In this paper, various intelligence techniques are used to test. Three phase transformer winding configurations and. A wide range of dmms are available to measure voltage, current, and resistance, depending on the motor power ratings. Three phase, 3 wire delta input three phase, 3 wire delta input three phase, 3 wire delta output three phase, 3 wire. Video lecture on open circuit test and short circuit test on transformer of chapter single phase transformer of subject basic electrical engineering for.
The primary and secondary of the transformer can be independently connected either in star or delta. Keep the tap changer of transformer in normal position. A guide to transformer winding resistance measurements bruce hembroff, cet, manitoba hydro matz ohlen, megger sweden peter werelius, megger sweden abstract. May 15, 2018 vector group test of transformerthe vector group of transformer is an essential property for successful parallel operation of transformers. Check calibration of all thermal gauges and hotspot heater, bridge rtds and associated alarm contacts. Prior to cleaning the unit, perform asfound tests, if required. Jul 06, 2016 a dmm digital multimeter, such as this keithley dmm7510 from tektronix, is a musthave instrument for motor testing. The procedure of the transformer ratio test is simple.
Type of cores 3 legs 1 wound leg 2 return legs legs and yokes not of equal cross section singlephase 2 legs 2 wound legs legs and yokes of equal cross section singlephase 3 legs 3 wound legs legs and yokes of equal cross section threephase type 1 type 2 type 3. Check nameplate and prints for proper voltages and external phasing connection to the line or bus. Power transformer open and short circuit tests objectives. In case tertiary is also connected, ensure the isolation of the same prior to commencement of testing. The test connection arrangement is shown in figure 2 c. Two of the most common tests to perform in the field on surge arresters are the power factor test and infrared analysis. Threephase dualvoltage motor insulation resistance testing. Loading capability dielectric withstand further operating characteristics tests are also part of a manufacturers internal quality assurance program.
Phenix transformer test systems are designed to perform. Hence every electrical power transformer must undergo through vector group test of transformer at factory site for ensuring the customer specified vector group of transformer. We just apply three phase 415 v supply to hv winding, with keeping lv. The transformer turns ratio test is used to make sure that the ratio between the windings of the primary and secondary coils follow the proper specifications. Aug 05, 2016 video lecture on open circuit test and short circuit test on transformer of chapter single phase transformer of subject basic electrical engineering for firstyear engineering students. Threephase transformer winding connections testguy. The high voltage winding of the transformer under test and the high. The new megger ttru3 transformer turns ratiometer uses a revolutionary design to perform a complete series of measurements on a transformer, including 3o step up turns ratio testing patent pending. Therefore, while designing the three phase transformer, this principle is used. Complete tests 1 and 2 for each winding of a three phase transformer individually with the remaining windings kept open. Threephase dualvoltage motor insulation resistance testing threephase dualvoltage motors are used for most daytoday operations in todays industrial plants. A testplan is comprised of the transformer 3phases connections nameplate voltages for each tap setting. Testing 3 phase motor windings pdf when there are many people who dont need to expect something more than the benefits to take, we will suggest you to have willing to reach all benefits.
Heat run test on three phase transformer aim to study heat run test on a three phase transformer. Transformer test plans the 3phase can store up to 128 transformer testplans in its flash eeprom. Routine tests and type tests of transformers electrical4u. Testrano 600 is the worlds first portable, threephase test system which supports all common electrical tests on single and threephase power and distribution transformers for routine and diagnostic testing onsite or during factory acceptance tests fat. Testing and diagnostics of power transformers brochure. Three phase ac current measurement using current transformer reference design 3 block diagram the tida00753 design focuses on the front end of the ct signal chain, as the block diagram in figure 3 shows. Vector group test of power transformer electrical4u. Following is an approximate sequence for transformer testing. Now disconnect the transformer neutral from ground. The reference has been generated using ref3212 for highprecision measurements.
Transformer testing has developed considerably over the past years. Threephase ac current measurement using current transformer. Basics, maintenance, and diagnostics vii contents continued page 4. The test setup and procedure of the frsl test is the same as for shortcircuit. Ensure that all equipment to be tested is properly grounded and treat all highvoltage power equipment as energized until proven otherwise by using the proper lockouttagout procedures. Testing of power transformers seems like a similar experience. Three phase transformer design geometry, deltawye connections, and many.
Threephase transformer test systems phenix technologies. It evolved from the simple gonogo verdict into a sophisticated segment within transformer manufacturing. To conduct standard open and short circuit tests in order to. These calculations are made to assure that the service equipment will clear a fault in case of short circuit. Pdf transformer testing type test and routine test of. Ensure the isolation of transformer from high voltage and low voltage side with physical inspection of open condition of the concerned isolators disconnectors. Jun 04, 2015 likewise, in three phase system where any two conductors acts as return for the current in third conductor, any two legs acts as a return path of the flux for the third leg if the center leg is removed in case of three phase transformer. As compared to a bank of single phase transformers, the main advantages of a 3 phase transformer are that it occupies less floor. Three phase transformers a transformer bank composed of three single phase units may be replaced by one 3 phase transformer the magnetic core has three fluxcarrying legs two yokes, bottom and top, couple the flux of the three legs the sum of the three fluxes equals zero each leg contains the primary and secondary windings. In this book we have laid down important aspects on transformer. Three phase transformer connections the three phase transformer consists three transformers either separate or combined with one core.
This is the first of a series of videos on our 3 phase transformer test 2. The transformer must be deenergized before this procedure, unless it. This test ensures that the transformer will provide the proper stepup or step down in voltage. Testing of three phase power transformer ijireeice. Transformer precommissioning tests and afterreceipt checks. In manual method, lot of time is required to test any type of transformer and risk involved is higher. Ece 494 electrical engineering laboratory iii lab 3.
Before conducting a transformer winding resistance test, it is important to observe all safety warnings and take proper precautions. Tests serve as an indication of the extent to which a transformer is able to comply with a customers specified requirements. Three phase solution to speed up and simplify power transformer testing three powerful sources the compact and powerful design with three integrated sources enables you to perform high accuracy measurements in a fraction of the time required by other solutions. Transformer testing type tests and routine tests of. Three phase transformer winding connections the primary and secondary windings of a three phase transformer can be connected in different configuration to meet just about any voltage requirement. Measuring a transformer s dc resistance from one external terminal to another can reveal a great deal of information about the transformer. Testing of 3phase, 50hz, 13kv power transformer free download as powerpoint presentation. It is also used on aircraft, both commercial and military.
In comparison to the impulse procedure, sfra is preferred for frequency domain. This test is similar to tests 1 and 2, but as applied to a three phase. The windings are shorted and the test voltage is applied to one winding while the. Open circuit test and short circuit test on transformer. This test is similar to tests 1 and 2, but as applied to a three phase transformer for phase identification and phase continuity check. Motors are susceptible to the gradual failure of their insulation resistance. But these days, the latter is gaining popularity because of improvement in design and manufacture but principally because of better acquaintance of operating men with the three phase type.
Testrano 600 threephase power transformer test system. Read and download ebook testing 3 phase motor windings pdf at public ebook library testing 3 phase motor windings pdf download. Threephase test system for comprehensive power transformer. We just apply three phase 415 v supply to hv winding, with keeping lv winding open. Inspect transformer and parts for shipping damage and moisture. Short circuit fault calculations short circuit fault calculations as required to be performed on all electrical service entrances by national electrical code 1109, 11010. In a shelltype shell form transformer, the steel magnetic circuit core forms a shell surrounding the windings. It stands out by the display quality and intuitive operation.