Nr Electric Co., Ltd

Nr Engineering Co., Ltd

Pegbio Co., Ltd.

Wei Lv

Dongming Cao

Wei Shi

Taixun Fang

Yeyuan Xie

Bing Yang

Wenjie Wang

Tao Wang

Bin Liu

Yinghui Zhang

Xiaosu Luo

Lele Li

Michael Min Xu

Min Xu

A closing control method for a high-voltage DC circuit breaker. The method comprises: closing breaking units of the transfer branch () group by group, then closing the main branch (), and finally open the transfer branch. During the process of closing the breaking units of the transfer branch group by group, determine whether there is a fault in the power transmission system after closing current breaking unit group. if there is no fault, proceed to close the next breaking unit group until all breaking unit groups are closed before proceeding to the next step; if there is a fault, all the breaking units that have been closed are opened and the closing operation is ended. The method can pre-charge the power transmission system during the closing process of the high-voltage DC circuit breaker, and lower the overvoltage and system oscillation caused by the closing operation.

Closing control method for high-voltage direct-current circuit breaker

The present invention provides a composition comprising a GLP-1 receptor agonist and a glucagon receptor agonist and an application of the composition. More specifically, the present invention provides a pharmaceutical composition comprising a pharmaceutically effective amount of the GLP-1 receptor agonist and the glucagon receptor agonist, wherein the GLP-1 receptor agonist and the glucagon receptor agonist independently form a conjugate with a hydrophilic polymer, or the GLP-1 receptor agonist and the glucagon receptor agonist jointly form a conjugate with the hydrophilic polymer.

Composition comprising GLP-1 receptor agonist and glucagon receptor agonist and application thereof

A bridge-type circuit comprises a H-bridge switch module and a buffering and reclosing module. The H-bridge switch module comprises four power semiconductor switch devices. Every two of the four power semiconductor switch devices are connected in series in the same direction to form a bridge arm, and the two bridge arms are further connected in parallel. Middle points of the two bridge arms respectively serve as an input terminal and an output terminal. The buffering and reclosing module is connected in parallel with the two bridge arms of the full bridge module. Also provided are a direct current breaking device formed by connecting the above bridge-type circuits in cascade and a control method thereof. The direct current breaking device is provided with the buffering and reclosing module, such that line voltage fluctuation generated during a reclosing operation is small.

Bridge-type circuit, and direct current breaking device and control method thereof

A direct current switch-off device comprises an on-state current branch circuit and a current commutating and breaking unit which are connected in parallel. The on-state current branch circuit has a mechanical switch (S) and a current transfer module which are connected in series. The current commutating and breaking unit comprises a bridge-type branch circuit and a current-breaking branch circuit. The current-breaking branch circuit and two bridge arms of the bridge-type branch circuit are connected in parallel. The current-breaking branch circuit comprises a nonlinear resistor (RI) and a valve group consisting of fully-controlled devices connected in series. The nonlinear resistor (RI) and the valve group are connected in parallel. Two ends of each fully-controlled device in the valve group are connected in parallel with a buffering and reclosing circuit.

Direct current switch-off device and control method thereof

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Jiangsu, China

Wei Lv