The Uniform Current Test-Bed Of The Traction Power Rectifier And Micro-Computer Inspection System

The traction power rectifier is the key equipment in the circuit of diesel locomotive with electric transmission. Generally, the rectifier has the function of three-phase bridge-type rectifying circuit. According to the different using condition, the rectifiers in different type of locomotives have not the same amount of rectifying elements parallel in its six-bridge line, and what's more, the same type of elements possesses the characteristic's difference. So that at normal using condition, every element is loaded with irregular current intensity, and it is harmful to all elements in this situation, hence affect the locomotive normal running condition. The uniform current test of the rectifier for traction power is the test subject that aimed at inspecting the current distribution of the rectifying elements in every parallel branch line bridge.The uniform current inspection system in the past locomotive branch was mostly use general shunt as inspection elements for every bridge branch parallel circuit and total current. This method utilize the pointer-type current meter, artificial reading and then calculate out the uniform current intensity factor. This lead to low productivity and the system is to be bad immunity, eventually obtain the lower degree of accuracy, and it didn't meet the needs of reliability requirement for traction power rectifier. Since 1997, the tendency of various new type of traction power rectifier and various kinds of rectifying elements are coming, the uniform mode of rectifying elements in the traction power rectifier are changed from 6-bridge lines x 6-parallel to 6-bridge lines x 4-parallel and 6-bridge lines x 2-parallel. Relatively the requirements in respect to reliability and precision for the test of uniform current intensity on traction power rectifier are higher. It is a new subject faced to the locomotive overhaul companies that the currently test equipments on traction power rectifier uniform current intensity can't meet the needs of railway developing and it also lack of required compatibility.The main points of this topic is: to make use of Haul sensor which posses high accuracy as to inspecting branching elements and total current, to us industry computer as the basic center, to utilize treating and analyzing software to compose a in-time data collecting and calculating system, from which to combine a system solution that has high precision, non-interaction and more effect productive. All those will assemble a kind of reasonable test mode through the analysis to the factor of present typical traction power rectifier of locomotive using block programming, dominate the flexible equipment and strengthening the system flexibility, and then to solve the compatibility problem of test of many kind of rectifiers, to suit the test function for various locomotives, when necessary, only to make a little adaptable change of software.The topic has solved the new problem faced to locomotive overhaulcompanies in the new era. Through applying micro-computer automatic control and in-time data collection technique on railway production field, and finally open up a special field in the production practice of computerization, making a technical progress and strengthening the market competitive ability.