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Earth fault detection device for direct current system

A DC system and grounding fault technology, applied in the direction of fault location, fault detection according to conductor type, etc., can solve problems such as power system accidents, relay protection device misoperation, etc.

Active Publication Date: 2016-04-20
GUANGZHOU PREFECT SERVICE ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a ground fault occurs in the DC system, since there is no short-circuit current flowing through the system, the fuse will not be blown, and the relay protection device may malfunction, causing serious power system accidents

Method used

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  • Earth fault detection device for direct current system
  • Earth fault detection device for direct current system
  • Earth fault detection device for direct current system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] figure 1 A schematic structural diagram of a DC system ground fault detection device provided in Embodiment 1 of the present invention, the device specifically includes:

[0029] Signal generation module 110, fault analysis module 120 and fault location module 130;

[0030] Among them, the signal generation module 110 is used to set the working mode of the fault analysis module, and generate a current signal with a set frequency and amplitude matching the working mode, and inject the current signal into the DC system, firstly to Inject the current signal into the positive-to-ground of the DC system, then stop the positive-to-ground current signal after a period of time, and start injecting the current signal into the negative-to-ground of the DC system, in order to make the positive or negative voltage of the DC system The ground changes, and the frequency and amplitude of the current signal can be set arbitrarily as required.

[0031] The fault analysis module 120 is...

Embodiment 2

[0035] figure 2 A schematic diagram of the structure of a DC system ground fault detection device provided in Embodiment 2 of the present invention. On the basis of Embodiment 1, this embodiment optimizes the fault analysis module. The advantage of such optimization is that it can accurately detect the DC system Is there a ground fault. Described device specifically comprises:

[0036] The signal generation module 210 is used to set the working mode of the fault analysis module, and generate a current signal with a set frequency and amplitude matching the working mode, and inject the current signal into the DC system, and the fault analysis module 220, used to sample the changing voltage on the bus of the DC system when the positive voltage or negative voltage of the DC system changes to the ground, calculate the resistance value and distributed capacitance value of the DC system to the ground according to the sampled voltage, and calculate The above resistance value judges...

Embodiment 3

[0061] Figure 6 A schematic diagram of the structure of a DC system ground fault detection device provided by Embodiment 3 of the present invention. On the basis of the above embodiments, this embodiment optimizes the fault location module. The advantage of such optimization is that the DC system can be accurately detected. Is there a ground fault. Described device specifically comprises:

[0062] A signal generation module 310, configured to generate a current signal with a set frequency and amplitude, and inject the current signal into the DC system;

[0063] The fault analysis module 320 is configured to sample the changing voltage on the bus of the DC system when the positive or negative voltage of the DC system changes to the ground, calculate the resistance value of the DC system to ground according to the sampled voltage, and calculate the resistance value of the DC system to ground according to the resistance judge whether there is a ground fault in the DC system, a...

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Abstract

The invention discloses an earth fault detection device for a direct current system. The device comprises a signal generating module, a fault analyzing module and a fault positioning module; the signal generating module is used for setting a working mode of the fault analyzing module, generating a current signal which is matched with the working mode and has the set frequency and amplitude and injecting the current signal into the direct current system; the fault analyzing module is used for sampling varying voltage of a bus of the direct current system, judging whether an earth fault exists in the direct current system and synchronously transmitting the sampled voltage and the current signal which has the set frequency and amplitude to the fault positioning module; the fault positioning module is used for sampling a branch circuit leakage current in the direct current system through a direct-current current clamp meter or alternating-current current clamp meter and performing fault positioning processing according to a sampling result and the data synchronized by the fault analyzing module. According to the earth fault detection device for the direct current system, a user can conveniently perform switching using between a direct current mode and an alternating current mode according to the self demand, and therefore the earth fault in the direct current system can be accurately and reliably detected out.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of ground fault detection in electric power systems, and in particular to a ground fault detection device for a DC system. Background technique [0002] The DC system of power plants and substations is a very important working power source in the power system. It provides power for secondary equipment such as electrical, thermal, automatic devices, relay protection, emergency lighting, and communications. The normal work of these secondary equipment is very important to ensure the safe operation of power plants and substations. Therefore, there are higher requirements on the reliability of the power supply of these secondary devices. When a ground fault occurs in the DC system, since there is no short-circuit current flowing through the system, the fuse will not be blown, and the relay protection device may malfunction, causing serious power system accidents. [0003] The actual runni...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 赵应龙王伟曾建斌
Owner GUANGZHOU PREFECT SERVICE ELECTRONICS TECH
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