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TT, TN distribution system

A power distribution system and power supply technology, applied in the direction of measuring electricity, electrical components, circuit devices, etc., can solve the problems of user property loss, burning of electrical equipment, voltage rise or fall, etc., to achieve scientific protection function setting and power grid operation Safe, cost-effective results

Pending Publication Date: 2019-08-23
BEIJING PEOPLES ELECTRIC PLANT
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0002] In the three-phase four-wire power supply system, the N wire keeps the three-phase voltage balanced and stable, and the neutral point will not shift due to the imbalance of the three-phase load, resulting in abnormal power supply. If the N wire is disconnected, the three-phase The unbalanced load makes the three-phase voltage unbalanced, and the voltage at both ends of the load of each phase may rise or fall abnormally. The phase with too high voltage may burn out the electrical equipment and cause property losses to users; the phase with too low voltage may Can use electrical equipment and fail to work normally, seriously affecting the reliability of power supply

Method used

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Embodiment Construction

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041] Such as figure 1As shown, in the embodiment of the present invention, a TT, TN power distribution system is provided, and the TT, TN power distribution system includes: a primary power distribution system 800, a secondary power distribution system 810, and a tertiary power distribution system 820, The first protection device 100 - 1 , the second protection device 100 - 21 , the third protection device 100 - 22 , the first current collector 300 and the l...

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Abstract

The invention provides a TT, TN distribution system (800, 810, 820). The distribution system (800, 810, 820) is provided with at least one protective device (100-1, 100-21, 100-22...) and at least oneelectronic controller, and is characterized in that a power supply of the electronic controller is obtained from the distribution system (800, 810, 820), at least one current collector (300) is arranged on N lines corresponding to the protective device (100-1, 100-21, 100-22...), and the rated current value of the current collector (300) is not greater than 20% of the rated current of the N line.The protective device disclosed by the invention realizes the functions of detecting and protecting N line breakage under the condition of three-phase current unbalance which causes damage to a loadand will affect the normal operation of the load, thereby enabling the protection function setting of the protective device to be more scientific, reasonable and perfect, and enabling the operation ofthe power grid to be safer. Meanwhile, the TT, TN distribution system achieves the goal of enabling the traditional electric power protection device to have the above functions at a low cost, therebyhaving an extremely high cost-performance ratio.

Description

technical field [0001] The invention is applied to the field of three-phase four-wire power distribution, and particularly relates to a TT and TN power distribution system. Background technique [0002] In the three-phase four-wire power supply system, the N wire keeps the three-phase voltage balanced and stable, and the neutral point will not shift due to the imbalance of the three-phase load, resulting in abnormal power supply. If the N wire is disconnected, the three-phase The unbalanced load makes the three-phase voltage unbalanced, and the voltage at both ends of the load of each phase may rise or fall abnormally. The phase with too high voltage may burn out the electrical equipment and cause property losses to users; the phase with too low voltage may The electrical equipment that will be used cannot work normally, seriously affecting the reliability of power supply. Therefore, it is necessary to detect and protect the disconnection of the N line. Integrating the N l...

Claims

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Application Information

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IPC IPC(8): H02J1/08H02J3/00G01R31/02
CPCH02J1/08H02J3/00G01R31/50
Inventor 南添吕毅华张太利章龙何斌李灵王立昌刘万里王雪楠张炎南寅
Owner BEIJING PEOPLES ELECTRIC PLANT
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