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Method for protecting high-voltage DC three-pole power transmission line

A transmission line, high-voltage direct current technology, applied in the direction of circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as the failure of DC line protection to operate reliably, improve safety and reliability, high precision effect

Inactive Publication Date: 2014-08-06
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Application Information

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Problems solved by technology

However, when a fault occurs, the existing DC line protection fails to operate reliably, and the fault continues so that the large trigger angle monitoring protection and DC low-voltage protection in the backup protection of the converter block the DC

Method used

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  • Method for protecting high-voltage DC three-pole power transmission line

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0019] A high-voltage direct current three-pole power transmission line protection method, which is used to detect a ground fault on the direct current line and extinguish the fault current through a protection action. The high-voltage direct current three-pole power transmission line includes a rectifier station, an inverter station and The pole 1 line, pole 2 line and pole 3 line between the station and the inverter station, this method includes traveling wave protection, differential undervoltage protection, line differential protection and DC line restart, such as figure 1 As show...

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Abstract

The invention relates to a method for protecting a high-voltage DC three-pole power transmission line. The method is used for detecting the ground fault of a DC line and extinguishing fault currents through protection actions. The high-voltage DC three-pole power transmission line comprises a rectifier station, an inverter station, a first pole line, a second pole line and a second pole line, wherein the first pole line, the second pole line and the third pole line are all connected between the rectifier station and the inverter station. The method comprises traveling-wave protection, differential undervoltage protection, line longitudinal differential protection and DC line restarting. The protection of the first pole line, the second pole line and the third pole line is divided into the two steps that (1) the DC voltage variation and the DC voltage variation rate of the first pole line and the second pole line are detected, whether the DC voltage variation and the DC voltage variation rate of the first pole line and the second pole line both meet a setting values or not is judged, and if yes, protecting action is conducted; (2) the DC voltage variation rate of the third pole line is detected, whether the DC voltage rate of the third pole line meets a setting value or not is judged, and if yes, the protection action is protected. Compared with the prior art, the method for protecting the high-voltage DC three-pole power transmission line has the advantage of improving the system safety.

Description

technical field [0001] The invention relates to a line protection method, in particular to a high-voltage direct current three-pole power transmission line protection method. Background technique [0002] The faults of DC transmission lines are generally caused by flashover to ground caused by the reduction of line insulation level caused by environmental factors such as lightning strikes, pollution or tree branches. At the moment when the DC line is short-circuited to ground, a drop in DC voltage and a rise in DC current are detected from the rectifier side; a drop in DC voltage and DC current is detected from the inverter side. However, when a fault occurs, the existing DC line protection fails to operate reliably, and the fault persists until the DC is blocked by the large trigger angle monitoring protection and DC low-voltage protection in the backup protection of the converter. [0003] With the development of the power system, HVDC three-pole transmission is used for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/44H02H3/50
Inventor 鲍伟王之浩周德生崔勇赵丹丹肖嵘张嘉旻徐文丽王巨波
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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