The Design And Implementation Of The Dc Resistance Tester

Dc resistance test is the essential test items of transformer after the handover, overhauland change tap-changer. Under normal circumstances, With the traditional method (bridgemethod and pressure drop method) measurement and large power transformer winding dcresistance of the inductor device is a time-consuming work. In order to change this situation,develop an dc resistance quickly tester to shorten the measurement time and reduce theworkload of test personnel and research. With high-speed microcontroller as the core, built inrechargeable battery and charging circuit, adopt high speed A/D converter and programmablecurrent source technology, reached unprecedented effect and highly automated measurementfunction with high precision, wide measurement range, the data stability, good repeatability,strong anti-jamming capability, perfect protection function, fast charge and discharge, etc.Self-checking and automatic calibration function to reduce the difficulty of the instrumentoperation and maintenance, and large power transformer winding is measured inductance dcresistance of the ideal equipment. Made the dc resistance is the rapid test equipment ofmeasurement of transformer, generator, transformer, motor.Thesis summarizes the research background and significance of the transformer firstly,introduces the digital research present situation and the main function of dc resistance testerand corresponding parameter measuring principle and method is given. This design adopts theadvanced four line method, can overcome the scene test line voltage caused by the poorcontact or electric field problem determination, accurate and reliable test data, and putforward the overall design scheme of dc resistance tester, Secondly, C8051F340and AD7710as the core chip, plus the real time clock, memory, LCD, button, power supply, such as serialinterface devices complete the design of hardware circuit. Again, in combination withhardware platform, and puts forward the overall design scheme of software system, and givesthe program design flow of every module and part of the implementation code. Finally, hascarried on the system debugging to dc resistance tester, the experimental data show that theinstrument can to real-time monitor power quality, achieve the expected goals, has a certain practical value.