The above transformer ratio test can also be performed by portable transformer turns ratio ttr meter. A header can be printed that provides spaces to record the ttr serial number, test date, operator name, transformer information, temperature, test voltage, relative humidity and commentsnotes. 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. The megger ttr series of instruments determines the transformer turnsratio using the ieee c57. Ttr 1001 handheld ttr n single and threephase transformer testing up to 1 mva n lightweight, handheld n battery powered, line rechargeable n tests turns ratio, phase displacement, excitation current, winding resistance and polarity n rs232 for data transfer n stores 200 test results and 100 userdefined transformer test settings ttr 1001. Before conducting a transformer winding resistance test, it is important to observe all safety warnings and take proper precautions. Deviations in turns ratio readings indicate problems in one or both windings or the magnetic core circuit. Transformers are an electrical component that transmit electrical energy between at least two circuits.
For the purpose of this paper, we will focus on a deltawye power transformer dyn1. Instruction manual for threephase ttr transformer turn. Megger ttr test sets are designed to meet requirements and. Ttr 300 series 3phase transformer turns ratio test sets. Buy megger ttr330 threephase transformer turns ratio test. Hzbb10a ttr transformer turns ratio tester electric test. In this video we walk you through the simple steps for performing a transformer turns ratio test using the vanguard instruments atrt03 s2. Optional perform an applied voltage test on all high. In the case of a low voltage handcrank powered ttr, 8 v ac is applied to the tested, lowvoltage transformer winding and a reference transformer in the ttr set.
The megger ttr201 is an automatic, handheld, battery operated transformer turns ratio test set. The polarity of the connection had to be verified with each winding. Stores 200 test results and 100 userdefined transformer test settings. Megger ttr20 transformer turns ratio tester manual. A ttr test should be made for any new highvoltage power transformer at the time it is. Breakdown of the dielectric system in a power transformer column. 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. Sea transformers from the ttr series comply with environment. Ttr in remote control mode or to transfer test results and to provide full transformer test report. Automated distribution class transformer test systems multiple test stations for high volume transformer testing. Ttr 201 handheld ttr n simple, onebutton operation n lightweight, handheld n battery powered aa or lr6 n tests turns ratio, excitation current, and polarity n ability to record via optional printer n rugged metal connectors on leads and unit ttr 201 handheld ttr description the megger ttr201 is an automatic handheld battery operated transformer turns ratio test set. Megger 550005b singlephase, handcranked ttr transformer.
The hv and lv windings of one phase of a transformer are connected to the instrument, and the internal bridge elements are varied to produce a null indication on the detector. It is not replacing the user manual for the actual instrument and does not. Ttr transformer t urns ratio this test is very important for an engineer to figure. Threephase ttr transformer turns ratio test set three. Ttr20 handheld ttr description the megger ttr20 is an automatic handheld battery operated transformer turns ratio test set. Ttr100 handheld ttr ttr 100 handheld ttr amazon s3. Ratio test is done using a transformer turns ratio tester or with voltmeters. The latest ttr available from megger is the ttr1001, a handheld, robust, lightweight and battery operated instrument. Transformer ratio test is conducted to ensure that the turns ratio tally with the name plate details and also that tap changer connections are done correctly.
Ttr300 series 3phase transformer turns ratio test sets. Ttr310e and ttr330a threephase transformer turns ratio test set. Measurements are taken by applying a known low voltage across one winding and measuring the inducedvoltage on the corresponding winding. The test set outputs an excitation test voltage to the transformer s primary windings and measures the voltage at the corresponding secondary winding. Using this test correctly can help to identify tap changer performance, shorted turns, open windings, incorrect winding connections and other faults inside transformers. This paper is going to focus on a subset of electrical diagnostic tests. Voltage and turn ratio test of transformer electrical4u. The megger 550005b singlephase, handcranked ttr transformer turns ratio test set measures the turns ratio and exciting current of windings in power, potential and current transformers.
Performing a transformer turns ratio test with the. Measuring the polarity and turn ratio of a transformer winding assures that the. The ttr is also suited for testing power transformers in manufacturing environments where testing can be performed quickly including storage of results while minimizing the possibility of errors. Ttr is also suited for testing power transformers in manufacturing environments where testing can be performed quickly including storage of results while. Transformer testing winding resistance test as per. Please note that you would need pdf reader to open the file. Ttr in remote control mode and to transfer test results and to provide full transformer test report. Leads marked to ansi, iec, and australian standards. Their unique testing procedures and storage capability allows an operator to set up and test difficult threephase transformers with multiple tap changers and bushing cts in a fraction of the time than it used to take with other ttrs. The ttr300 series of threephase transformer turns ratio test sets are designed to measure the turns ratio of power, instrument, and distribution transformers in a substation or manufacturing environment.
The ttr300 series of threephase transformer turns ratio test sets are designed to measure the turns ratio of power, instrument, and. Their unique testing procedures and storage capability allows an operator to set up and test difficult threephase transformers with multiple tap changers and bushing cts in a. Power transformers are the central hub in the field of energy distribution and transmission. How to perform a power transformer turns ratio test eep. This test also includes a passfail limit of individual ratios. Transformer turn ratio ttr testing cr4 discussion thread. The voltage ratio is displayed and compared with the expected target ratio. Threephase ttr measuring instruments pdf manual download.
The ttr set operates on the principle that the voltage ratio of the transformer at no load is practically equal to the true turns ratio. The ttr300 series are ideal for use by power transformer manufacturers. The only ttr available at one time was a singlephase unit that was cranked by hand to produce an output voltage of 8v. Ttr 251 handheld ttr n simple, onebutton operation n lightweight, handheld n battery powered aa or lr6 n tests turns ratio, excitation current, and polarity n ability to record via optional printer n rugged metal connectors on leads and unit ttr 251 handheld ttr description the megger ttr251 is an automatic handheld battery operated transformer turns ratio test set. Ttrtransformer turns ratio testers from jm test systems. It is possible to test single phase twowinding transformers with a threephase ttr test set by only utilizing the h1, h2 and x1, x2 leads. These films are made purely for the skill development purpose. Printer test results can be documented with a thermal printer. Every transformer is tested at our test room with routine tests. A ttr is an extremely useful instrument for testing transformer windings because it can help locate several types of problems within single and threephase transformers.
View and download megger threephase ttr instruction manual online. Megger ttr330 threephase transformer turns ratio test set datasheet. Presenting you a series of transformer testing films shot and edited by me. Ttr20 and ttr201 ttr20 discontinued highvoltage equipment read the entire manual before operating. The turns ratio test is capable of detecting shorted turns in the winding, which indicate insulation failure by determining if the correct turns ratio exists. The transformer turns ratio test, or ttr test, confirms that the transformer has the correct ratio of primary turns to secondary turns. Megger ttr201 transformer turns ratio tester tequipment. Shorted turns may result from short circuits or dielectric failures. For additional technical details about the megger ttr330 threephase transformer turns ratio test set please refer to the product datasheet.
Hzbb10a ttr transformer turns ratio tester introduction. Type test edition 08 division energy management date 20180615 digital grid transformer differential protection v07. To ensure continued proper operation, transformers are tested to verify that their electrical properties have not changed from design specifications. We will investigate test procedure, test preparation, and expected results. Integrated powerdb onboard allows for data analysis. The resulting overloads of grid sections can lead to farreaching supply and production failures. The header automatically includes the type of transformer single or. During the processing of the semifinished products and the finished products in transformer production, the transformer newly installation before using, or according to iec and national standard, the turns ratio or. Transformers regulate the voltage in circuits, but in some cases these can go bad and cause a circuit to not. This ttr will complement several existing megger transformer test products and will offer functions, such as winding resistance and polarity.
Connect the x0, x1, x2, and x3 test cables to the corresponding lowvoltage winding of the transformer under test. The ttr is also suited for testing power transformers in manufacturing environments where testing can be performed quickly including storage of results while. Their unique testing procedures and storage capability allows an operator to set up and test difficult threephase transformers with multiple tap changers and. Purchase, rent, and calibration available on most products. Ttr winding ratio test wrm winding resistance measurement capacitive compensation bank. Avtmttr320 ttr320 manual rev a oct 2008 biddle megger. The turns ratio test, also known as a ttr transformer turns ratio is, like most tests, easier to perform now than it used to be. A transformer turns ratio test set such as the ttr100 can directly measure the ratio of single phase, as well as three phase transformers. Quick test mode provides the fastest testing of a transformer. Ttrtransformer turns ratio testers jm test systems. Also, voltage on another winding on the same core is detected. The transformer turns ratio tester ttr is device used to measure the turns ratio between the windings example shown below.
They have an in built power supply, with the voltages commonly used being very low, such as 810 v and 50 hz. The transformer turns ratio tester ttr is device used to measure the turns ratio between the windings example shown below voltage is applied on the h marked leads and measured of the x marked lead by the test set ratio measurements are conducted on all tap positions and calculated by dividing the induced voltage reading into the applied voltage value. It is used to measure the turns ratio, excitation current and polarity of windings in single and threephase distribution and power transformers tested phase by phase, potential and current transformers, and tapped transformers. Ttr300 series threephase transformer turns ratio test set. Avtmttr330 rev 3 march 2010 2 checking reverse polarity at start of each test via ethernet port, an external pc or laptop can be connected to operate the ttr in remote control mode or to transfer test results and to provide full transformer test report quick test mode provides the fastest testing of a transformer. As such, their condition is critical for reliable, faultfree operation. Understanding the value of electrical testing for power.
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