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The EMI Study of Pole-Mounted Switch’s Breaking on Its Secondary Smart Devices
Pages: 27-37
Year: Issue:  8
Journal: Transactions of China Electrotechnical Society

Keyword:  Pole-mounted switchFTU controllerEMIsynthetic testwavelet analysisfrequency distribution;
Abstract: The higher requirement of intelligent equipment is put forward with the construction and development of smart grid. The safe and reliable operation of secondary control and protection devices is the important guarantee to realize the intelligentialize of the primary equipment. Polemounted switch is the key equipment for the protection and control in the power distribution system, and the high frequency signal produced during the breaking arc process is known to be one of serious sources of electromagnetic interference(EMI) to its secondary smart equipment, which can lead to secondary devices of pole-mounted switch display malfunction. Hence, it is of great significance to study the EMI problem of the secondary smart equipment due to the operations of pole-mounted switch. This paper carried out the synthetic test for 10 k V pole-mounted switch by using synthetic test circuit. The output signal of current transformer(CT), the input and output signals of FTU controller were collected at the same time, and then obtained the disturbance frequency band and energy distribution of the signals due to the breaking of pole-mounted switch by time-frequency characteristic analysis. Results show that, the secondary sides of CT and FTU controller are bearing the transient EMI when pole-mounted switch is in operation; the frequency distribute is mainly in 7.81~15.62 MHz due to the breaking arcing process of pole-mounted switch; the frequency distribute is mainly in 31.25~62.5MHz at the time of arc current passing zero; the EMI caused by transient recovery voltage(TRV) is mainly distribution in 31.25~125MHz.
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