Field Test Technology And Application Of The Merging Unit In Intelligent Substation

As a key component of the smart grids, intelligent substation is an important platform to achieve the energy conversion and control in the smart grids. With the comprehensive construction and the deep application of the intelligent substation, the test mode and method of intelligent substation equipment badly need to be summarized in detail. In order to meet the demands of large-scale construction and safe operation of intelligent substation and the requirement of safe operation. New test method, which is efficient, accurate and convenient, must be explored continually. Digital signal acquisition system is constituted by transformer and merging unit. Because the reliability of using electronic current transformer can not meet the demand of the large-scale application of intelligent substation in electric power system, the structure of normal transformer and merging unit become a fesible transition plan for the signal acquisition and transmission of intelligent substation.The data base will be transformed to the merging unit by the normal transformer. With transforming analog quantity to digital quantity, the merging unit provides the original data to twice standard equipments such as protection device. The safe and stable operation of the intelligent substation is decided by the quality of merging unit.Merging unit plays a role in measuring, monitoring, protection and control system in intelligent substation. The main function of the merging unit is synchronous sampling of multi-channel voltage and the twice value of current transformer.As the same time, according to a certain format, merging unit packs sampling value, then outputs to the equipment which can do the twice measurement, measurement and protection. Digital signal acquisition system is completed by transformer and merging unit.In the intelligent substation, the function of simulate relay protection device is completed by the digital relay protection device and the merging unit. So the detection technology, testing the performance parameter of the related equipments from the functional properties of measurement and protection, is one of the key technology in the intelligent substation. By researchiong on the field data which is measured by the merging unit, this topic includes: sampling precision, absolute delay, delay and packet rated output time discrete time error, error, punctuality, double AD data and so on. By using the integrated detection device, the test performance of the merging unit is dicide by the standard of the standard specifications. The problem will be reflected to the merging unit manufacturers. After repaired by the factory, it must be detected again. The related performance parameters, which are detected finally by the merging unit, can meet the various requirements.