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Microcomputer Power Transformer Temperature Rise Test Test

Value, the top oil temperature rise above ambient temperature does not exceed the specified temperature limits; (2) verify that all points take over. Either the average winding temperature rise above ambient temperature does not exceed the specified temperature limits; (3) verification except core, winding or electrical connection outside of the tank's structure if local overheating. This GB1094.2-96 limits the temperature rise is not provided, but still require high temperature can not generally require no more than 80K, so that adjacent parts of oil by the heat blast damage or excessive aging. 2. Test principles of determination of the steady-state temperature rise of oil-immersed transformer method, the simplest test is the equivalent short-circuit wiring methods. The test sample is usually low voltage side of the outlet terminals shorted, deleted from the high voltage supply of a total loss, provided the top and bottom oil temperature rise of oil temperature rise. Then reduce the input current to the rated current. Determination of average winding temperature rise, calculated winding temperature of the surrounding oil, coupled with the total loss of oil under the average temperature, calculated by the rated voltage and rated current, the average winding temperature rise. Alternatively, you can use One of them is the test product. The other is the secondary side of transformer test product of the rated voltage of rated frequency excitation, the other side by two different voltage transformer ratio, or the input voltage by 41 other ways to try Pinliu been rated current in the measurement the case of small-capacity transformers can also be applied to the proper load rated voltage and rated current (or close to the rated voltage and current) to test the direct load method. We use Mainly because this method is convenient for computer testing. And accuracy. This method requires equipped with a suitable auxiliary transformer (rated capacity, rated voltage of the connection symbol, etc.) and in parallel on both sides of the test product, test product on one side of the rated frequency, rated voltage (single phase transformers) for excitation the other side of the two transformer winding voltage generated circulation to ask for the test product of the rated current (or close to the rated current), but also in the parallel circuit of people within the string side of the third transformer winding, an appropriate voltage input to regulate the circulation to the rated current of the test product. The experimental principle is shown in Figure A, similar to the principle of three-phase transformer, where the state is no longer tert. Loss of power for pulling an empty space diagram of a single transformer for negative feedback enamel shield wiring principle leap T. - Is the test product T, a test sample with the rules and being the auxiliary transformer Tr-orange closure auxiliary transformer load loss clamor average temperature is hot and cold winding resistance method to determine. In a stable environment and temperature (ie temperature and oil temperature, winding under the same conditions), measuring the cold resistance of transformer winding, when the oil temperature to a roar, and the measured resistance R. After the test cut off power supply when the winding is R, then winding average temperature is 0. D02 = A (235 +01) a 235 (copper) 1D02 A (225 +0) a 225, (Al) Order cut off the power when the temperature of the external cooling medium, the average winding temperature rise is: △ 8 call-101 3 . Computer test method for temperature rise test in order to avoid the traditional test methods test connection error caused by non-uniform, where the provisions of the standard test sequence, respectively, 6 different access points for the detection measurements, each test point sampling 1o points, the digital filtering. Measurements were calculated automatically after the test report form. Transformer nameplate data for association, the network notified the interface, the source data to the computer, according to testing requirements for the preparation of the corresponding analysis software. The hardware design block diagram shown in figure II, the software design diagram as shown in Fig 42 Portugal sac pressure halo chrome base license to teach, according to Head = Cheng '} which aims to phase capsule ■ Post Gao point Yiu Ha Yu stripping tRI electricity storage i (k) and) set up to take control of amplification 『training to teach workers orange tide point l cattle numbers: k} 1} ft difficult to pronounce Xiao Rong Qu dollars fighting Rao Yong Tan △ average amount of content on the World} was brother to the test i play Qiang Li Jl l4. Conclusion The above describes the basic principle of the transformer temperature rise tests and appropriate microcomputer testing methods, the basic transformer test also includes: DC resistance test; voltage ratio test; test polarity and join groups; load test; dielectric loss test; harmonic analysis and waveform drawing; load test; frequency voltage withstand test; induced voltage test, etc. Most of which i can test the temperature rise test design ideas and methods to achieve computer control,[link widoczny dla zalogowanych], and form a complete transformer test the computer detection system, which will improve the measurement and analysis of the accuracy and speed, is conducive to safe and reliable power transformers and economic operation, to reduce testing costs.