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A DC low voltage protection simulation device

A DC low-voltage protection simulation technology, which is applied in the direction of measuring devices, instruments, and measuring electronics, can solve problems such as the inability to truly simulate the operating status of DC low-voltage protection.

Active Publication Date: 2015-08-19
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this simulation model does not involve the simulation of DC low-voltage protection, so it cannot truly simulate the operating state of DC low-voltage protection of the HVDC DC control and protection system

Method used

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  • A DC low voltage protection simulation device
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Embodiment Construction

[0017] In order to better understand the above-mentioned technical solution of the present invention, a further detailed description will be given below in conjunction with the accompanying drawings and embodiments.

[0018] figure 2 An embodiment of the DC low-voltage protection simulation device of the present invention is shown, which is connected to the DC system protection unit 300 of the DC control and protection system and used for the simulation of the DC control and protection system of the HVDC power transmission equipment. The DC low-voltage protection simulation device of the present invention is one of the basic functional units of the DC system protection unit 300 of the DC control and protection system. The simulation device of the DC control and protection system of HVDC transmission equipment is as follows: figure 1 shown.

[0019] Such as figure 2 As shown, the DC low-voltage protection simulation device of the present invention includes a current trigge...

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Abstract

The invention belongs to the field of electrical measurement, and particularly relates to a direct current under voltage protection simulating testing device which is used for simulation research of a direct current control protection system of a high voltage direct current transmission device. A direct current voltage signal end is connected with a first AND gate through an arithmetic operation element and a first Schmitt trigger sequentially; the other input end of the first AND gate is connected with a rectifying state signal end; an output end of the first AND gate is connected with a second AND gate through a first timer; the other input end of the second AND gate is connected with an original electrode operation state signal end; an output end of the second AND gate is connected with a first OR gate through a second timer; an output end of the first OR gate is connected with a direct current under voltage protection signal end of the direct current under voltage protection simulating device through a third timer. The direct current under voltage protection simulating device can truly simulate and reflect an operation state of a direct current control protection device and offer corresponding simulating results for research or design of the direct current control protection device.

Description

technical field [0001] The invention belongs to the field of electrical measurement, and in particular relates to a direct current low voltage protection simulation test device used for simulation research on direct current control and protection systems of high voltage direct current transmission equipment. Background technique [0002] The ever-increasing demand for electricity has led to the development of power transmission systems in the direction of long distance, large capacity and high stability. As the construction projects of UHV AC transmission projects and HVDC transmission projects in various power grid regions continue to increase, the power grids in areas where power consumption is concentrated show obvious characteristics of UHV AC-DC hybrid receiving-end power grids with multi-DC feeds. The power grid structure is tight, and the electrical distance between multiple AC and DC lines is closer. After the UHV and EHV AC systems fail, it is easy to cause multiple...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 崔勇郭强
Owner STATE GRID CORP OF CHINA
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