Research And Application Of Integration And Detection Technology For Primary And Secondary Equipment Of Distribution Switch

With the wide application of intelligent distribution equipment,the operation and management of distribution network have been significantly improved.At present,it is primary and secondary fusion equipment as an integrated design of switch,state sensor and intelligent component that solves traditional equipment’s problems of interface mismatch and poor compatibility and scalability,and primary and secondary fusion equipment gradually becomes an important part of intelligent distribution network.However,so far,most studies on the fusion technology of distribution switch’s primary and secondary equipment have mainly focused on the modular and standardized design of switch and control unit,while few researches have explored the access network detection of integrated equipment.Therefore,the further investigation is necessary.Based on the structure theory of distribution terminal acquisition unit,this paper analyzes the influence of temperature rise,pressure and strong electromagnetic interference on the performance of primary and secondary fusion equipment under the field operating condition.The result,out of Proteus simulation verification,indicates that the impact of temperature on the distribution terminal is mainly reflected in the change of internal components and output gain;besides,the pressure will cause condensation and flashover discharge in the secondary equipment and shorten the insulation life;additionally,the effect of strong electromagnetic interference on the terminal unit is the generation of Internal Overvoltage and crosstalk signal.Combined with theoretical analysis,the thesis conducts an in-depth study on operation reliability and measurement accuracy of the fusion equipment by building the test circuit.In the temperature test,the ratio difference of measurement accuracy of terminal unit is about 2.0%,and the phase difference is up to 15′;when the test pressure is 0.35 MPa,the ratio difference increases to about 0.65%,and the phase difference is up to 9′;under the interference of 40 k V lightning impulse,the ratio difference is over 1.0%,and the phase difference is about 20′.In order to improve the operation reliability of the fusion equipment,a suppression method of anti-interference for the primary and secondary integrated distribution switch based on the series connection of L-type and π-type circuits,and the accuracy detection method of transformer proposed in the thesis can effectively solve the problem about high frequency damped oscillation at the transformer’s input terminal under the electromagnetic interference.Combined with the experimental results and the technical tender requirements of State Grid Corporation of China,a detection strategy of primary and secondary integrated distribution switchgear including temperature,pressure,electromagnetic interference and other factors is proposed in the thesis.On the one hand,the strategy remedies the lack of integrated detection standard of the existing integrated equipment’s access network detection,from the aspects of equipment’s basic function and performance reliability under operating environment.On the other hand,through verifying the detection strategy in the laboratory and factory,the thesis summarizes disadvantages of the fusion equipment at the current stage,and offers the effective solutions.According to the theory and experiment,this paper verifies the feasibility and effectiveness of integrated detection and fusion technology of distribution switch’s primary and secondary fusion equipment,and provides a reference for the future investigation into prototype of intelligent distribution switch with a higher degree of integration.