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A Method for Calculating the Transient Rating of Elements of Grounding Electrode Lead Monitoring Device

A technology for monitoring devices and grounding electrodes, which is applied in the field of calculating transient ratings of grounding electrode lead monitoring device components, can solve problems such as DC system outage, waste, equipment damage, etc., to ensure stable operation, prevent insulation breakdown accidents, The effect of reliability assurance

Active Publication Date: 2020-06-30
CHINA XD ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the DC transmission system suffers from overvoltage caused by lightning, operation, failure or other reasons, once an equipment insulation breakdown occurs, it may cause equipment damage, or even cause the DC system to shut down. In more serious cases, the load center will lose its large capacity. power supply, and then endanger the stable operation of the regional power grid, the consequences will be very serious
At present, in the HVDC power transmission projects that have been built in my country, the transient ratings of the components of the ground electrode lead monitoring device are generally directly given by engineering experience, which often results in excessive electrical insulation margins for the equipment, resulting in a certain amount of waste

Method used

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  • A Method for Calculating the Transient Rating of Elements of Grounding Electrode Lead Monitoring Device
  • A Method for Calculating the Transient Rating of Elements of Grounding Electrode Lead Monitoring Device
  • A Method for Calculating the Transient Rating of Elements of Grounding Electrode Lead Monitoring Device

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Embodiment Construction

[0016] The scheme of the present invention will be described below through specific examples:

[0017] In order to achieve the above objectives, the technical solution adopted by the present invention is to build a simulation model on software to simulate the most severe transient operating conditions that may occur during operation of the simulation equipment. That is, the two fault conditions of the ground-to-ground fault on the line side of the ground electrode of the blocking filter and the ground-to-ground fault of the capacitor high-voltage end of the injection loop filter are respectively built to simulate and analyze.

[0018] See figure 1 As shown, the end-to-ground blocking filter device is protected by the neutral bus arrester E, and the device end is protected by the arrester FL1 connected in parallel to the reactor L1. The reactor L2 of the injection loop filter is protected by the parallel lightning arrester FL2, the end-to-earth is protected by FL2 and FL2D in series...

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Abstract

The invention discloses a method for calculating an element transient state rated value of a grounding electrode wire leading monitoring device. According to the method, important parameters such as the reference voltage, cooperation current, residual voltage and energy absorption capacity of a lightning arrester of the grounding electrode wire leading monitoring device can be accurately calculated, insulation levels and impulse current data of a capacitor and an electric reactor in the grounding electrode wire leading monitoring device are determined, and the situation is avoided that insulation breakdown accidents of the grounding electrode wire leading monitoring device are caused by generated overvoltage; the situation is avoided that the system cannot detect the breakdown generated by a grounding electrode circuit and even the outage of a direct current system, stable running of a regional power network is guaranteed, and powerful guarantee is provided for the reliability of the high-voltage direct-current transmission engineering.

Description

【Technical Field】 [0001] The invention belongs to the technical field of high voltage direct current transmission, and relates to a method for calculating the transient rating of a ground electrode lead monitoring device component. 【Background technique】 [0002] The converter station of the HVDC transmission system needs to be equipped with a certain number of ground electrode lead monitoring devices (ElectrodeLine Impedance Supervision, ELIS) ​​to monitor the impedance change of the ground electrode line in real time, so as to detect the possibility of the ground electrode line under various operating conditions Faults occur and locate the point of failure so as to eliminate the fault as soon as possible, reduce the outage time of the HVDC transmission system and increase the availability of the HVDC transmission system. [0003] Power system overvoltage is one of the main factors that endanger the safe operation of power system. After the DC transmission system is struck by lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20Y02E60/00
Inventor 张帆苟锐锋任军辉王浩杨帆李琳
Owner CHINA XD ELECTRIC CO LTD
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