Alternating current protection circuit and system lightning-protection circuit

Abstract

The invention discloses an alternating current protection circuit and a system lightning-protection circuit and relates to the solar field. In the alternating current protection circuit, a first end of a first pressure-sensitive unit is connected with a first phase line of three-phase alternating current, and a second end of the first pressure-sensitive unit is connected with a first end of an alternating current grounding unit and a second end of a discharge unit; a first end of a second pressure-sensitive unit is connected with a second phase line of the three-phase alternating current, and a second end of the second pressure-sensitive unit is connected with the first end of the alternating current grounding unit and the second end of the discharge unit; a first end of a third pressure-sensitive unit is connected with a third phase line of the three-phase alternating current, and a second end of the third pressure-sensitive unit is connected with the first end of the alternating current grounding unit and the second end of the discharge unit; a second end of the alternating current grounding unit is grounded; and a first end of the discharge unit is connected with a neutral conductor of the three-phase alternating current. According to the alternating current protection circuit and the system lightning-protection circuit, the neutral conductor N carries out protection through series connection of the discharge unit and pressure-sensitive units, interference and crosstalk of the phase line A, the phase line B and the phase line C on the neutral conductor N are avoided because of low junction capacitance of the discharge unit, and conducted interference of the line N is effectively lowered.

Description

technical field [0001] The technical field of solar energy equipment of the present invention particularly relates to an AC protection circuit and a system lightning protection circuit. Background technique [0002] At present, with the increasingly tense global energy use, the application of solar energy has attracted more and more attention from various countries, and governments of various countries have invested in various preferential policies to vigorously promote its development. As one of the key components of solar energy applications: solar inverters have also been widely used. Due to the particularity of solar energy applications, solar inverters generally need to be installed in places with harsh lightning environments such as roofs and open fields. Therefore, it is necessary to consider a large number of levels of lightning protection for the power port of the solar inverter. [0003] The traditional solar inverter circuit generally adopts a transformer-isolate...

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides an AC protection circuit and a system lightning protection circuit to solve the problem of excessively high conduction interference of the neutral line N of the three-phase AC power in the lightning environment

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