US 12,241,944 B2
Distributed insulation detection device for multi-stage DC system
Shuo Su, Guangdong (CN); Jianye Liu, Guangdong (CN); Shihao Qin, Guangdong (CN); Bao Song, Guangdong (CN); Yuhui Ye, Guangdong (CN); and Min Shao, Guangdong (CN)
Assigned to ZTE CORPORATION, Guangdong (CN)
Appl. No. 17/629,366
Filed by ZTE CORPORATION, Guangdong (CN)
PCT Filed Sep. 2, 2020, PCT No. PCT/CN2020/113059
§ 371(c)(1), (2) Date Jan. 21, 2022,
PCT Pub. No. WO2021/043173, PCT Pub. Date Mar. 11, 2021.
Claims priority of application No. 201910844102.4 (CN), filed on Sep. 6, 2019.
Prior Publication US 2022/0252680 A1, Aug. 11, 2022
Int. Cl. G01R 31/52 (2020.01); G01R 27/02 (2006.01)
CPC G01R 31/52 (2020.01) [G01R 27/02 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A distributed insulation detection device for a multi-stage direct current (DC) system, comprising:
an intelligent control module, and
a sampling module, a basic insulation combination module and an intelligent resistance switching network module connected with the intelligent control module; wherein:
the sampling module is configured to collect voltage data and leakage current data of the multi-stage DC system, and to transmit the voltage data and the leakage current data to the intelligent control module;
the basic insulation combination module is configured to detect a ground insulation fault of the multi-stage DC system;
the intelligent resistance switching network module is configured to adjust a resistance value of the distributed insulation detection device of the multi-stage DC system; and
the intelligent control module is configured to process the voltage data and the leakage current data, and to control the basic insulation combination module and the intelligent resistance switching network module to make adjustment;
wherein the sampling module, the basic insulation combination module and the intelligent resistance switching network module are respectively connected to a DC bus of the multi-stage DC system in any order; and
wherein the basic insulation combination module comprises: a first balanced resistor pair RD11 and RD12, a second balanced resistor pair RD21 and RD22, and a first switching switch pair KD21 and KD22; wherein:
the second balanced resistor pair RD21 and RD22 are respectively corresponding to and connected in parallel with the first switching switch pair KD21 and KD22;
the first balanced resistor pair RD11 and RD12 are respectively corresponding to and connected in series with the second balanced resistor pair RD21 and RD22 and the first switching switch pair KD21 and KD22 that are respectively connected in parallel and are further respectively connected in series to a positive lead to ground and a negative lead to ground of the DC bus.