State Grid Corporation of China

China Electric Power Research Institute

Cnpc Engineering Technology R&d Company Limited

Guojun Liu

Gang Wang

Gang Chen

Zhihui Wang

Tao Jia

Tao Zhao

Mingjie Lv

Jianqi Li

Fei He

Jianli Wang

Binggui Xu

Yongliang Yu

Hongwei Yin

Zhitong Liu

Huijuan Guo

Wanjun Li

Quanli Zhang

Yingjie Zhu

Biyao Huang

Nan Quan

Xiaofeng Qu

Licheng Wang

Shaohua Zhou

Mingmin He

The present invention discloses an expandable liner hanger system comprising a central pipe and an expandable pipe, with an expansion cone provided therebetween the central pipe and expandable pipe in a way that the expansion cone is movable along the central pipe, so that the expandable pipe is expanded; wherein, the expansion cone comprises an expansion cone seat move along the central pipe, and an expansion cone sleeve fitted over the expansion cone seat, the connection between the expansion cone seat and the expansion cone sleeve is configured in a way that the expansion cone sleeve can move upward together with the expansion cone seat along the central pipe so that the expandable pipe is expanded, and the central pipe can drive the expansion cone seat to disengage from the expansion cone sleeve.

Expandable liner hanger

A detection system of distributed generation islanding based on power frequency carrier, the detection system comprising: a power frequency carrier signal generating device; a power frequency carrier signal detection device; a signal coupling transformer; a substation bus; a distribution power generator (DG); and a safety isolation breaker, wherein the power frequency carrier signal generating device comprises a voltage and current monitor circuit, the power frequency carrier signal generating device is connected with the signal coupling transformer through four three phase four line power cables, and the signal coupling transformer is connected with substation bus through 3 power cables.

Detection system and detection method of distributed generation islanding based on power frequency carrier

Growing community of inventors

Beijing, China

Guojun Liu