Situations of circuit breaker in distributing network with neutral earthed closing for compensation capacitor groups synchronously are simulated and analysed

and effective synchronous closing strategies are given. The system of synchronous closing is designed based on floating-point DSP

the process of which is represented. The key technologies of synchronous closing are researched. The mathematical model of different control voltage and ambient temperature to predict the closing time is created by BP artificial neural network method. The steepest descent method is used to correct weights and threshold values. The network with the advantages of high accuracy and powerful fault tolerance capability is trained by a sufficient number of samples. Action time of circuit breaker is compensated adaptively

in order to reduce the dispersion of three-phase action time. Multiple test results reveal that synchronous control error is kept to within ±1 ms.