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DC electric circuit protection device and arc detection method

A technology for electrical circuits and protection devices, applied in circuit devices, emergency protection circuit devices, emergency protection devices for automatic disconnection, etc., can solve the problem of non-existence of current zero point, current that does not reach circuit breaker tripping, arc difficult to extinguish, etc. question

Active Publication Date: 2020-11-06
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, in the case of a DC electrical circuit, a constant current flows continuously, so the current zero point does not exist, and it is difficult to extinguish an arc generated once
In addition, in the event of an accident as described above, it is difficult to detect the occurrence of an arc because there is no current reaching the circuit breaker trip

Method used

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  • DC electric circuit protection device and arc detection method
  • DC electric circuit protection device and arc detection method
  • DC electric circuit protection device and arc detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0026] figure 1 It is a circuit diagram showing a schematic configuration of the DC power supply system according to Embodiment 1 of the present invention. The AC power supply 1 is connected to an input terminal of an AC-DC conversion circuit 3 via an AC circuit 2 . A plurality of AC-DC conversion circuits 3 may be connected in parallel to the AC power supply 1 . The output terminal of the AC / DC conversion circuit 3 is connected to a circuit breaker 4 , and is divided into a plurality of circuits 5 from the circuit breaker 4 via a trunk line. Each electric circuit 5 is connected to a switchboard 6 . A plurality of DC circuits 20A, 20B, and 20C connected to the plurality of loads 10A, 10B, and 10C are provided inside the switchboard 6 . Inside each DC electrical circuit 20A, 20B, 20C, capacitors 7A, 7B, 7C are arranged between the positive and negative circuits, switches 8A, 8B, 8C are arranged between the positive and negative circuits, and between the positive and negative...

Embodiment approach 2

[0048] exist Figure 8 In the above, as Embodiment 2, the configuration in which the current sensor 9D is added to the junction of the positive and negative circuits is shown. Furthermore, in the figure, with the figure 1 The same reference numerals used in and indicate the same or corresponding parts. By adding the current sensor 9D at the junction of the positive and negative circuits, it is possible to detect the arc 25 generated in the circuit at the junction. Accordingly, it is possible to expand the section in which the occurrence of an arc can be detected. The detection of the occurrence of the arc 25 can be performed by using the same arc noise frequency analysis unit 121 and arc noise intensity comparison unit 122 as those in the first embodiment.

[0049] Figure 9It is a flowchart explaining the operation of the arc detection device 100 of the DC power supply system according to Embodiment 2 of the present invention. From step 1 to step 7 and from step 8 to ste...

Embodiment approach 3

[0053] exist Figure 11 In Embodiment 3, it is shown in figure 1 In the configuration of the first embodiment shown, voltage sensors 12A, 12B, and 12C are added between the positive and negative circuits. Furthermore, in the figure, with the figure 1 The same reference numerals used in the above represent the same or corresponding parts. At this time, the block diagram of the structure of the arc detection device 100 of the DC power supply system is as follows Figure 12 shown. Should Figure 12 The block diagram shown is in the figure 2 In the block diagram of the arc detection device 100 shown, a voltage signal input unit 113 is added. Furthermore, in the figure, with the figure 2 The same reference numerals used in the above represent the same or corresponding parts. The voltage signal input part 113 is to receive from Figure 11 The voltage signals of the shown voltage sensors 12A, 12B, 12C are set.

[0054] The flow chart of the operation of the arc detection ...

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Abstract

In a DC power supply system composed of a combination of a plurality of DC circuits ( 20A, 20B, 20C), when an arc accident occurs, it is difficult to identify the DC circuit ( 20A, 20B, 20C) in which the arc occurred. Therefore, it is assumed that the DC electrical circuit protection device determines the DC electrical circuit in which the arc has occurred, and has: a plurality of DC electrical circuits (20A, 20B, 20C), which have a current provided in at least one of the positive circuit and the negative circuit. sensors (9A, 9B, 9C), and a unit for absorbing arc noise on the upstream side of said current sensors (9A, 9B, 9C); and an arc detection device (100) based on said DC electric circuit (20A , 20B, 20C) of the current signal detected by the current sensor (9A, 9B, 9C), compare the signal strength of the arc noise of each of the DC electrical circuits (20A, 20B, 20C), based on the signal Intensity, determined for the DC electrical circuit (20A, 20B, 20C) in which the arc occurred.

Description

technical field [0001] The present invention relates to a DC electric circuit protection device and an arc detection method for protecting a direct current electric circuit from being affected by a direct current arc, detecting an arc generated in a direct current electric circuit, and protecting the direct current electric circuit. Background technique [0002] In recent years, the amount of data processed in network servers and the like has increased significantly due to the spread of information terminals, the ITization of equipment, and the emergence of cloud computing technology. As the amount of data to be processed increases, the power load on the information and communication equipment increases. These processes are generally performed in information communication equipment in data centers, and about one-third of the power consumption is said to be consumed by information communication equipment. Therefore, in order to save energy, high-voltage DC power supply syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/16G01R31/08H02H3/00H02H3/02H02H3/06H02H3/07H02H3/10
CPCG01R31/08H02H3/00H02H3/02H02H3/06H02H3/07H02H3/10H02H3/16H02H1/0015H02H3/44H02H7/268G01R31/1272H02H3/38
Inventor 金丸诚森贡月间满
Owner MITSUBISHI ELECTRIC CORP
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