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Power-supply rectifying system at direct current side with protection device

A technology of protection device and rectification system, applied in the direction of DC network circuit device, emergency protection circuit device, circuit device, etc., can solve the problem of not being able to cut off the DC side load in time, reduce the probability of large-scale power outage, and improve the reliability of power supply performance and improve operational reliability

Active Publication Date: 2009-02-11
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The load voltage of high-current DC power usually does not exceed 1800V DC, but the DC current reaches tens or even hundreds of kiloamperes. The rectification system for power supply is often composed of multiple rectification devices connected in parallel to form a DC power supply system, for example: a 300kA, 1300V The electrolytic aluminum production system requires 5 to 6 rectifiers connected in parallel to supply power. In order to quickly cut off the power supply when a short-circuit fault occurs inside the rectifier, a reverse current detection device is installed on the DC branch bus when the rectifier is designed. When a short circuit occurs, the current flows into the short circuit point, and the direction of the local current flowing through the system bus changes. The reverse current detection device operates and outputs a trip signal to act on all parallel-connected rectifier units. The AC side circuit breaker cuts off the AC side power supply, but this method exists The following defects, first of all, when a short-circuit fault occurs on the DC side of a rectifier unit, all rectifier units operating in parallel must be powered off at the same time. In addition, because there is no quick-break switch on the DC side, the DC side load cannot be cut off in time, often due to the DC load. The effect of back electromotive force makes the fault continue to worsen

Method used

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  • Power-supply rectifying system at direct current side with protection device
  • Power-supply rectifying system at direct current side with protection device

Examples

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Embodiment 1

[0016] The electrolytic aluminum production process is a continuous process, which requires the reliable operation of the rectification system that provides power for the electrolytic aluminum production line. figure 1 It is a structural diagram of a power supply rectification system with a protection device on the DC side. The DC power supply rectification system is composed of multiple rectifier units connected in parallel. In order to ensure the safety and reliability of the DC power supply, when a rectifier unit fails, the faulty unit must be quickly isolated . The existing DC power supply rectification system is composed of a high-voltage AC bus 1, a high-voltage AC circuit breaker 2, a voltage regulating rectifier transformer 3, a rectifier 4, a DC branch bus 5, a DC isolation switch 7, a DC bus positive bus 8, and a DC bus negative bus 9. It consists of a microcomputer protection unit 10 and an auxiliary control box 11. The power supply rectification system with protec...

Embodiment 2

[0019] The DC non-contact isolating switch device 6 described in Embodiment 1 can also be replaced by a DC circuit breaker to isolate the current of other non-faulty units and the current generated by the DC load back EMF from flowing into the fault point. Other structures are the same as Embodiment one.

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PUM

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Abstract

In particular, the disclosed power supply rectification system is aimed at DC bus without quick breaking switch of multiple or single rectification system. When producing inner short circuit fault, the disclosed rectifier can cut off and insulate DC power supply rectification system at fault point quickly. Being setup in front of DC disconnecting switch from DC output of each rectifier unit, a DC non-contact disconnecting switch device possesses reverse blockout function, and can be shutoff at same time following ac circuit breaker in high voltage. The invention solves issues that load at DC side cannot be cut off in time, and fault continues deterioration caused by counter-electromotive force of Dc load for former DC power supply system, where there is no quick breaking switch at DC side. The invention raises operation reliability of rectification system greatly.

Description

Technical field [0001] The present invention relates to a large-current DC power supply rectification system, in particular to a rectifier system that does not have a quick breaking switch on the DC bus of multiple or single rectifier systems, and can quickly cut off and isolate the fault point when an internal short circuit fault occurs in the rectifier Power supply rectification system with protection device on DC side. Background technique [0002] The load voltage of high-current DC power usually does not exceed 1800V DC, but the DC current reaches tens or even hundreds of kiloamperes. The rectification system for power supply is often composed of multiple rectification devices connected in parallel to form a DC power supply system, for example: a 300kA, 1300V The electrolytic aluminum production system requires 5 to 6 rectifiers connected in parallel to supply power. In order to quickly cut off the power supply when a short-circuit fault occurs inside the rectifier, a r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J1/00
Inventor 袁进禹戈广金王同砚刘朝胜徐煜
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE