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Neutral line breakage detection protection method and device

A neutral line disconnection, detection and protection technology, applied in the direction of automatic disconnection emergency protection device, emergency protection circuit device, measuring device, etc., to achieve the effect of fewer components, avoiding shortening of service life, and simple circuit

Inactive Publication Date: 2011-04-06
CHONGQING UNIV
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Problems solved by technology

[0003] Although the three-phase load is always balanced as much as possible when designing the low-voltage power distribution system, in the actual operation process, the situation that the three-phase load is completely balanced rarely occurs, so when the neutral line is intact, There will be three-phase unbalanced current flowing

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  • Neutral line breakage detection protection method and device
  • Neutral line breakage detection protection method and device

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Embodiment Construction

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] figure 1 It is the main circuit connection diagram of the neutral line disconnection detection and protection device; figure 2 It is the control circuit connection diagram of the neutral line disconnection detection and protection device; as shown in the figure, the neutral line disconnection detection and protection device proposed by the present invention consists of a current detection unit, a relay group, a circuit breaker execution unit, a primary recloser and a harmonic Light alarm circuit composition:

[0034] The current detection unit is used to detect the current in the phase line and the neutral line of the three-phase power supply system;

[0035] The relay group realizes the connection and disconnectio...

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Abstract

The invention relates to neutral line breakage detection protection method and device, belonging to the technical field of low-voltage system protection. An object of the method and the device is a low-voltage distribution system containing single-phase load. The device comprises a current transformer, a relay, a one-shot reclosing device, a circuit breaker and external accessories thereof. The method judges whether a neutral line is broken by detecting the current condition on the neutral line twice before the tripping of the circuit breaker and after the tripping of the circuit breaker, a power supply is automatically cut off when the neutral line is broken, and an audible and visual alarm is given. The invention has the advantages of a few components, simple circuit and easy realization, not only can effectively detect the breakage fault of the neutral line and cut off the power supply, but also can detect and judge whether the operation of three-phase loads is temporally balanced under the condition that the neutral line is intact.

Description

technical field [0001] The invention relates to a low-voltage system protection method and device, in particular to a neutral line disconnection detection and protection method and device. Background technique [0002] In the existing low-voltage power distribution system, the three-phase four-wire system is widely used for power supply. In the three-phase four-wire power distribution system, since the neutral point of the secondary side of the distribution transformer is well grounded, the neutral line and the three-phase line Constitute a practical and effective whole. In the three-phase load asymmetrical system, the existence of the neutral line is the basic condition to ensure the symmetry of the three-phase load voltage drop. If one phase line breaks, only the load power supply of this phase is interrupted, which does not pose a hazard to the safety of the load, but if the neutral line breaks, the neutral point will shift, making the three-phase voltage unable to mainta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/28G01R31/02
Inventor 雍静牛亮亮曾礼强杨岳杨本强王晓静
Owner CHONGQING UNIV
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