Transformer turn ratio test (also known as turns ratio test or TTR test) is a very important test item to ensure the healthy operation of the transformer. The transformer ratio test makes the transformer have the correct ratio of primary to secondary turns. Precise transformer ratio testing can help analyze the performance of the tap changer, determine if the tap changer is in the correct position, determine a winding short circuit or open circuit winding after a transformer failure, incorrect winding connections and other internal transformer faults, and whether the transformer is faulty can run in parallel.
Transformer ratio test currently uses automatic ratio change test equipment to test, compared to the traditional current method and voltage method test method, change ratio tester has a test speed, accurate test results, easy operation, etc. , Now list the five of the most popular transformer turns ratio testers in the world:
1. TTR310E (Brand: Megger United States)
This instrument is a variable ratio tester manufactured by Megger Company. It is characterized by accurate measurement, phase difference and excitation current measurement, remote control test function, and TTR measurement of CT and PT. This instrument is equipped with a large color The screen has a beautiful appearance, but the high price of the TTR310E will allow many users to consider other more economical testers.
2. ATRT-01 S3 (Brand: Vanguard United States)
This instrument is vanguard's fourth-generation instrument, which can be independently tested or controlled by a computer. It can calculate the percentage error of the ratio, can display the polarity and phase angle of the winding, and can also display the excitation current, but the LCD display seems to be some outdated, the process is a bit tedious when used with a keyboard.
3. JYT (Brand: Kingrun China)
The JYT Handheld Transformer turns ratio tester, developed by Kingrun in 2018, weighs only 1.8 kg. In addition to turns ratio testing, it offers features such as three-phase grouping testing, polarity testing, and excitation current testing. It is equipped with a multifunctional color touch LCD screen, making it easy and intuitive to operate. A single charge can test hundreds of transformers. This tester is economically priced and highly popular among transformer manufacturers.
4. TRT03A (Brand: DV power Sweden)
This instrument has a single-phase, three-phase test function, test accuracy, phase angle test function, USB interface, you can use their own development of DV-Win software for data comparison analysis.In addition, this model can measure transformer excitation current and phase shift, and perform automatic vector group detection and magnetic balance for three-phase transformers and three-phase autotransformers. In addition, they have built-in three-phase power supply. Therefore, TRT standard instruments can test transformers with special configurations, such as phase shifters, rectifiers, arc furnaces, traction transformers, etc.
5. VTRM (Brand: VEER India)
This instrument is the VEER company's automatic ratio tester with over-current protection function, can store 200 sets of test data, the appearance of lightweight and beautiful, precision and measurement range and the above four instruments are not a small gap, but the low price It will be very attractive to customers.
Kingrun Transformer Instrument Co.,Ltd.
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