Research and Application of Transient Transparent Sensing Technology in Substations Using Internet of Things to Distributely Connect Non-contact New Broadband Sensor

When the equipment in the substation undergoes major disturbances (such as short-circuit failure, system oscillation, frequency collapse, voltage collapse, line lightning intrusion, etc.), electrical quantities (voltage, current, frequency, etc.) will undergo transient changes. This process is to correctly analyze the accident. The basis of cause can be used to evaluate the operating status of equipment, find fault points, and quickly deal with faults. However, the current domestic transient information perception in substations still needs to be developed: 1) The existing system data sources are PT and CT data, which are restricted by the bandwidth of PT and CT, and the high-frequency monitoring accuracy is not high; 2) the construction and maintenance of centralized screens are complicated. Using a large number of secondary cables; 3) the redundancy is small, and it is not easy to increase and upgrade. Therefore, it is urgent to develop a new type of distributed substation transient information sensing technology, to develop a system wide-frequency transient current sensing technology based on advanced magnetic field sensors to achieve non-contact measurement, and to develop a system broadband transient based on advanced optical electric field sensors to achieve non-contact measurement. (paper)