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Low-voltage distribution system with leakage protection device

A low-voltage power distribution system, leakage protection device technology, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as leakage grounding, uneven quality, power failure, etc. Safety, the effect of avoiding electricity safety accidents

Inactive Publication Date: 2013-02-20
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The general leakage protector in the low-voltage station area is installed in the JP cabinet of the substation, and the final leakage protector is installed in the user's meter box. Since every household in rural areas, especially in plain areas, basically uses three-phase water pumps, the water pumps purchased in the market And other electrical equipment quality is uneven, leakage grounding phenomenon often occurs, some users can not put into operation due to the reason of the electrical equipment, resulting in the total leakage protector of the substation can not be used normally, resulting in a considerable number of low-voltage station areas The general leakage protection is out of operation, otherwise the whole station area will not be able to supply power
At the same time, there is a lot of maintenance and repair work on the low-voltage branch lines. Once the maintenance is overhauled, the entire station area will be cut off, which seriously affects the electricity consumption of residents and affects the reliability of power supply.

Method used

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Embodiment Construction

[0010] Depend on Figure 1-2 As can be seen from the illustrated embodiment, it includes a branch switch distribution box 1. The external dimensions of the branch switch distribution box 1 are: 70×25×20cm (length×width×height). The anti-mistake switch (200A) connected to the branch circuit is connected to the QLLT-250 branch circuit leakage protector below through the aluminum bar. The lower end is two low-voltage line inlet and outlet holes, and there are four fixing plates on the back of the box, which are fixed on the low-voltage line pole through hoop connection.

[0011] Principle and advantage of the present invention:

[0012] In the low-voltage power distribution system, when the branch switch distribution box is not equipped with a leakage protector, if a leakage current exceeds the limit fault in a certain branch, the power supply branch will not be cut off, and the leakage current will be reflected in the total leakage current. On the protector, due to the superpo...

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Abstract

The invention discloses a low-voltage distribution system with a leakage protection device, belonging to the technical field of low-volatile distribution equipment. The low-voltage distribution system comprises a master switch, a master leakage protector, a distribution transformer and a branch switch distribution box, wherein a branch leakage protector is connected to a branch in the branch switch distribution box. The low-voltage distribution system can perform leakage protection on each independent low-voltage branch; and the power supply of other branches can not be influenced even if one branch has a leakage failure, thereby greatly improving the power supply safety and reliability.

Description

technical field [0001] The invention relates to the technical field of low-voltage power distribution equipment. Background technique [0002] At present, the leakage classification protection method used in the low-voltage power grid is: the installation of general protection and final protection (the scope of protection is limited to the single-phase power supply network for residential lighting), but no intermediate protection. This imperfect leakage protection method has dead ends and disadvantages for the low-voltage power grid with single-phase and three-phase mixed power supply. The general leakage protector in the low-voltage station area is installed in the JP cabinet of the substation, and the final leakage protector is installed in the user's meter box. Since every household in rural areas, especially in plain areas, basically uses three-phase water pumps, the water pumps purchased in the market And other electrical equipment quality is uneven, leakage grounding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/26
Inventor 宋文革
Owner STATE GRID CORP OF CHINA
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