A neutral wire disconnection detection and 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. Voltage can not be kept in balance, etc., to achieve the effect of easy implementation, avoiding shortening of equipment service life, and high degree of automation
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[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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