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Neutral line breaking detection protection method and device

A neutral line disconnection, detection and protection technology, applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, measuring devices, etc. The equipment can not work normally and other problems, so as to avoid the shortened service life of the equipment, easy to implement, and less misjudgment.

Active Publication Date: 2012-11-28
CHONGQING UNIV +2
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Problems solved by technology

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 maintain balance, resulting in load failure. The voltage of each phase on the side is too high or too low compared with the normal voltage, and the electrical equipment cannot work normally

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

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Embodiment Construction

[0017] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] Such as figure 1 As shown, the neutral line disconnection detection and protection device in the present invention includes a current detection unit 1 , a detection signal conversion unit 2 , a signal processing unit 3 , a protection execution unit 4 and an audible and visual alarm unit 5 . In this embodiment, the current detection unit 1 includes four single-phase current transformers, which are used to detect the current in the three-phase lines and the neutral line. The primary sides of the four single-phase current transformers are respectively connected by three phase lines and the neutral line. The detection signal conversion unit 2 includes four groups of Hall current sensors; the signal processing unit 3 mainly includes a single-chip microcomputer for signal processing; the protection execution unit 4 includes a triode, a pho...

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Abstract

The invention discloses a neutral line breaking detection protection method and device, belonging to the technical field of low-voltage system protection. The neutral line breaking detection protection device mainly comprises a current detection unit, a detection signal converting unit, a signal processing unit, a protection executing unit and an acousto-optic alarm unit. According to the neutral line breaking detection protection method, a three-phase line current signal and a neutral line current signal are acquired, and are processed and analyzed by using a singlechip, therefore whether the neutral line is broken is judged; and when the neutral line is broken, the singlechip sends an action signal for disconnecting a circuit and sending an alarm. The invention has the advantages of simple and easy used elements, higher automation degree, capability of effectively detecting the breaking condition of the neutral line and protecting the neutral line, and better engineering applicability.

Description

technical field [0001] The invention belongs to the technical field of low-voltage system protection, and relates to a method and device for detection and protection of a neutral line disconnection. 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...

Claims

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Application Information

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IPC IPC(8): H02H3/00G01R31/02
Inventor 曾礼强雍静刘康淋杭启飞吴艳芳张玉兰
Owner CHONGQING UNIV
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