State Grid Jiangsu Electric Power Company

State Grid Jiangsu Electric Power Co., Ltd. Research Institute

Chinese Academy of Sciences

State Grid Corporation of China

Nanjing Dnn Technology Co., Ltd

Jiangsu Electric Power Research Institute Corporation Limited

Fengbo Tao

Hong Tao Liu

Yang Liu

Zhen Wang

Shu Chen

Qiang Huang

Jiansheng Li

Yongling Lu

Chao Wei

Chengbo Hu

Jianhua Qin

Jun Jia

Xueqiong Zhu

Guojiang Zhang

Ziquan Liu

Tianxi Xie

Shengquan Wang

Caibo Liao

Xu Wei

Ruibin Li

Yuncai Lu

Chao Yun

Hairong Wei

Lingling Xu

Yiming Wu

Min Zheng

Xiaoping Yang

Chong Tan

Jieqing Deng

Peng Wu

A micro-power wireless access method and apparatus for the Internet of things for power transmission and transformation equipment involves a time synchronization process, a traffic channel access process, a control channel configuration information access process, and a control channel burst information access process. In the time synchronization process, an aggregation node determines a delay parameter and other parameters based on a timeslot in which traffic information randomly transmitted by a sensing terminal is located, and the sensing terminal adjusts transmission time of a corresponding frame based on the parameters. The traffic channel access process adopts a mode in which one-way reporting is mainly used, to minimize working time of a sensor. The present disclosure realizes limited two-way communication on a control channel, supports configuration of a sensor cycle, a threshold, and other parameters, and supports a retransmission mechanism on the control channel for important alarm information.

Micro-power wireless access method and apparatus for internet of things for power transmission and transformation equipment

The present invention discloses a device for evaluating and demagnetizing residual magnetism quantity of a power transformer. A main circuit comprises a switching power supply the two ends of which are respectively connected with a filter capacitor and a resistor in parallel. A forward end of the switching power supply is connected with a main switch in series. A rear end of the main switch is connected with a series branch of a sixth switch and a first resistor, a series branch of a first switch and a second switch, and a series branch of a third switch and a fourth switch are connected in parallel. A driving circuit is respectively connected with driving ends of the main switch, the sixth, first, second, third and fourth switches. A control circuit is connected with the driving circuit for sending an instruction to the driving circuit.

Device for evaluating and demagnetizing residual magnetism quantity of power transformer and control method thereof

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Jiangsu, China

Fengbo Tao