US 12,266,914 B2
Method for processing interphase short circuit
Zhanyu Xue, Hebei (CN); and Jinchun Xing, Hebei (CN)
Assigned to BAODING YUXIN ELECTRIC TECHNOLOGY CO., LTD., Hebei (CN)
Appl. No. 18/265,811
Filed by BAODING YUXIN ELECTRIC TECHNOLOGY CO., LTD., Hebei (CN)
PCT Filed Dec. 2, 2021, PCT No. PCT/CN2021/135185
§ 371(c)(1), (2) Date Jun. 7, 2023,
PCT Pub. No. WO2022/121781, PCT Pub. Date Jun. 16, 2022.
Claims priority of application No. 202011453631.0 (CN), filed on Dec. 12, 2020.
Prior Publication US 2023/0387677 A1, Nov. 30, 2023
Int. Cl. H02H 3/10 (2006.01); H02H 3/08 (2006.01)
CPC H02H 3/083 (2013.01) [H02H 3/105 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for processing an interphase short circuit, wherein a plurality of controlled switches are distributed on a three-phase ineffectively grounded power supply system, and the controlled switches cut off a line according to a current duration;
when a simple two-phase or three-phase short circuit occurs in a line, following method (a) is performed, comprising:
(a) maintaining a fault phase of the line to be conducted and tripping off remaining fault phases, and artificially grounding another fault phase connected to the fault phase; connecting a neutral point or a charged phase of the three-phase ineffectively grounded power supply system other than the fault phase to a ground, so as to form a closed loop with the fault phase and a generate a current, setting a current duration for triggering a cut off of controlled switches at downstream of a power source to be smaller than that for triggering a cut-off of controlled switches at upstream of the power source, and when a certain controlled switch reaches a trigger condition and cuts off the line, stopping the other fault phase from being grounded, and stopping the charged phase or the neutral point from being connected to the ground; and
when a two-phase or three-phase short circuit accompanied with a ground fault occurs in a line, the method (a) is performed, or following method (b) is performed, comprising:
(b) maintaining a fault phase of the line to be conducted and tripping off remaining fault phases; connecting a neutral point or a charged phase of the three-phase ineffectively grounded power supply system other than the fault phase to a ground, so as to form a closed loop with the fault phase and generate a current, setting a current duration for triggering a cut-off of controlled switches at downstream of a power source to be smaller than that for triggering a cut-off of controlled switches at upstream of the power source, and when a certain controlled switch reaches a trigger condition and cuts off the line, stopping the charged phase or the neutral point from being grounded.