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Title:
MULTI-CHANNEL PHOTOVOLTAIC MODULE GROUND FAULT DETECTION DEVICE AND DETECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2023/284230
Kind Code:
A1
Abstract:
A multi-channel photovoltaic module ground fault detection device and detection method. The device comprises at least two ground fault detection units (11). Each ground fault detection unit (11) comprises an interlock switch (K2), a current-limiting resistor (R1), and a ground switch (K1), wherein the current-limiting resistor (R1) and the ground switch (K1) are connected in series between a ground end and a detection end (PV1-, PV2-, …, PVn-) of the ground fault detection unit (11); the detection end (PV1-, PV2-, …, PVn-) of the ground fault detection unit (11) is used to be connected to a negative electrode of a corresponding photovoltaic module thereof; a first end of the interlock switch (K2) is connected to a control end of the ground switch (K1), and a second end of the interlock switch (K2) is connected to the ground end; and hardware interlock structures are arranged between the interlock switches (K2) of all the ground fault detection units (11), and among all the interlock switches (K2), when one interlock switch (K2) is switched off, the other interlock switches (K2) are all turned off. In the device, one interlock switch (K2) is arranged at a control end of each ground fault detection unit (11), and only one ground fault detection unit (11) is allowed to work, thereby improving the accuracy of ground fault detection.

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Inventors:
HE HONGWEI (CN)
LIN ZHENHUANG (CN)
WU BAITONG (CN)
Application Number:
PCT/CN2021/135653
Publication Date:
January 19, 2023
Filing Date:
December 06, 2021
Export Citation:
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Assignee:
KEHUA DATA CO LTD (CN)
ZHANGZHOU KEHUA ELECTRIC TECH CO LTD (CN)
International Classes:
G01R31/52; H02S50/00
Foreign References:
CN113608145A2021-11-05
CN109188166A2019-01-11
CN204705694U2015-10-14
CN103474969A2013-12-25
CN103490402A2014-01-01
CN205005020U2016-01-27
US20200411260A12020-12-31
US20110199707A12011-08-18
KR20200024479A2020-03-09
JP2016039766A2016-03-22
Attorney, Agent or Firm:
HEBEI GUOWEIZHIYUAN INTELLECTUAL PROPERTY AGENCY CO., LTD (CN)
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