Intelligent grounding device

Abstract

The invention provides an intelligent grounding device. The intelligent grounding device comprises an on-off unit, a voltage acquisition unit, a data processing unit and a driving unit. An inlet wireof the on-off unit is connected with a neutral wire (N), and an outlet wire of the on-off unit is connected with a grounding wire; a voltage acquisition unit is connected with an A phase, a B phase, aC phase and the neutral line (N) to acquire a voltage value of each phase line; the driving unit drives the on-off unit to be conducted; and the driving unit drives the on-off unit to be conducted under the condition that the voltage value of at least one phase of the A phase, the B phase, the C phase and the neutral line (N) exceeds a preset threshold value, the driving unit is started to work,and the on-off unit is conducted. The intelligent grounding device has the advantages that by additionally arranging the intelligent grounding device provided by the invention, a three-phase four-wiresystem low-voltage distribution network system has an electric leakage protection function and a tripping protection function after the neutral line (N) is broken at the same time so that casualtiescaused by an electric shock of a human body are reduced, and a problem that an electric appliance is burnt due to a voltage rise after the neutral line (N) is broken is avoided.

Description

technical field [0001] The invention belongs to the field of neutral line (N) grounding of a low-voltage distribution network system, and in particular relates to an intelligent grounding device. Background technique [0002] At present, in the low-voltage distribution network system of the three-phase four-wire system, the grounding treatment of the neutral line (N) includes centralized grounding and repeated grounding. [0003] When the low-voltage distribution network with centralized grounding of the neutral line (N) is adopted, the advantage of this system is that a circuit breaker with leakage protection function can be installed at the front end of the low-voltage distribution network, and the grounding point is set at the front end of the circuit breaker. If there is leakage in the circuit, it can play a very good protective role, and can greatly reduce the occurrence of electric shock casualties. However, if the neutral line (N) is disconnected, the voltage behind t...

AI Technical Summary

Problems solved by technology

[0003] When the low-voltage distribution network with centralized grounding of the neutral line (N) is adopted, the advantage of this system is that a circuit breaker with leakage protection function can be installed at the front end of the low-voltage distribution network, and the grounding point is set at the front end of the circuit breaker. If there is leakage in the circuit, it can play a very good protective role, and can greatly reduce the occurrence of electric shock casualties. However, if the neutral line (N) is disconnected, the voltage behind the disconnection point will increase with The unbalanced phase load causes the voltage of each phase to rise or fall, and in serious cases, it will burn the electrical equipment.

[0004] When the low-voltage distribution network with repeated grounding of the neutral line (N) is used, the advantages and disadvantages of this system are exactly the opposite of those of the low-voltage distribution network with centralized grounding of the neutral line (N), that is, the advantages are: the neutral line (N) After the disconnection, the voltage behind the disconnection point will not increase or decrease in the voltage of each phase due to the unbalanced three-phase load, and the normal working voltage can still be guaranteed, so that the electrical equipment will not be burned However, due to the existence of other grounding points, the circuit breaker with leakage protection function cannot be used in the front section of the low-voltage distribution network, and it cannot protect the line leakage, which greatly increases the risk of human electric shock casualties

[0005] In view of the advantages and disadvantages of the above two grounding systems, in actual use, either choose centralized grounding and install a circuit breaker with leakage protection function to reduce the risk of electric shock to the human body; or choose repeated grounding to avoid burning electrical appliances; between the two Take care

[0006] In order to solve the above problems, the present invention provides an intelligent grounding device, which can make the three-phase four-wire low-voltage distribution network system, which can ensure the safety of leakage electricity, and can also avoid the problem of burning electrical appliances due to voltage rise after zero-off

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