|
At present, to ensure the security and stability of power grid operation hasbecome an important factor of guaranteeing the industrial and mining enterprisessafe production, promoting the continued growth of the national economy andsocial development, and the relay protection device in which play a decisive rolein the process of network security. Therefore, the safe operation of relayprotection device is particularly important.Using relay protection test apparatus to verify the performance of relayprotection is the most effective test method. The relay protection test apparatus’sperformance will decrease after a certain period of time, the accuracy decreased,and belongs to the standard value transfer equipment. Therefore, the electricpower industry standard "microprocessor relay protection test apparatus technicalconditions" put forward, it is necessary to regularly verify the specifiedperformance parameters.In order to solve the problems of low efficiency and inconvenient, thedomestic conditions that caused by the traditional way of still using multipleUniversal Instruments to verify corresponding index of relay protection testapparatus, using microprocessor, integrated circuits and other advancedtechnology, the calibration equipment of relay protection test apparatus isdesigned to measure AC, DC power, switch action time and other parameters.This paper describes the design of circuit and the software structure, hardwaredesign of the device in detail, test method and test data of each index is given,and the manufacture of prototype has been finished.This paper describes the protection device malfunction impact on powergrid at first, to ensure its safe operation need regular verification of relayprotection tester, verification technology and development status of the existingcalibration model of the relay protection tester, analysis of the current domestic market relay protection experimental calibration test function, index and usemethod, the overall structure and the design of the device test index. Thenaccording to each function module hardware circuit structure design scheme,including AC/DC, A/D conversion, signal recognition and microprocessormodule, gives the circuit diagram and program flow chart. Through the circuitmodules and test, proved that this device can finish the task on the check of therelay protection tester. The operation test shows that, this device has theadvantages of simple wiring, easy to operate and carry, good man-machineinterface, extensible, can make a contribution to ensure the development of safeand stable operation of power system, it has broad prospect in application.
|