Research And Application Of Measurement System For The Tripping Matrix Of Main Transformer

The tripping matrix of main transformer, refers to the array which is composed of maintransformer protection and its tripping outlet. When the relay protection engineers check themain transformer protection inspection, they face with differential, grounding, interphasedistance, zero sequence direction, and other types of compound voltage over-current protectionin high middle and low sides, one on each side of each backup protection may be divided intoI, II, III3segments, each segment has a plurality of time, each time the switch tripping is alsodifferent, which constitute the main transformer tripping matrix.At present, most of the test ofmain transformer, relay protection engineers mainly use the traditional multimeter measuringmethod to complete the survey work on protection plate action, but this method ofmeasurement result is not intuitive, can only achieve the detection of single protection plate isaction, not measuring the specific action time, it is also very difficult to differentiate eachaction. Security is low, because of misuse of the multimeter gear lead to switch maloperationevents occur from time to time. There are also through guiding the action contacts to the relayprotection tester way to measure to protection outlet, but the relay protection instrumentprovides open into the contact number is limited, and this method of wiring and complex, hasthe certain risk.Research and application of Main Transformer Outlet matrix measurement system, ismeasured by the method of traditional research, to explore the single-chip microcomputer asthe hardware carrier, verification completed Main Transformer Outlet matrix to icrocomputermeasurement system of the C programming language. Measuring system based on thetraditional multimeter and following the measurement principle of insurance measuringinstrument as the theoretical basis, changes in outlet pressure plate potential trigger conditions,by recording the movement time of SCM, and finally by the action of liquid crystal panelshows export. The hardware aspect, need to be connected in series with high resistance andphotoelectric isolation in the measurement loop, guarantee not to appear DC grounding anderror on the tripping circuit switch trip caused operation situation. At the same timemeasurement system for packaging and appearance should refer to the relay protection testerdesign, different functional wiring holes with different colors to distinguish, the use ofelectricity experiment commonly used line, convenient for the relay protection engineers use.The software aspect, take turns to scan a plurality of measuring port, detector to measure theexport potential changes and sustained when5ms recording time. An export has after theaction should not continue to measure, in order to avoid repeated measurement. Through therational design of software and hardware system has the characteristics of accurate,comprehensive, simple operation, the results of visual and safety, convenient the relayprotection engineers in the action of main transformer, bus differential and measuring exportBZT multi outlet protection device and safety device of self inspection when.Research of measurement system for the tripping matrix of main transformer, with usingmicrocomputer, realizes measuring a plurality of protection plates at the same time whichpeople can not do, and more reliability than people by visual judgment, effectively reduces the test difficulty and the risk, improves the efficiency of inspection test security and wiring.