Method for processing interphase short circuit
AssigneeBaoding Yuxin Electric Technology Co., Ltd.
InventorsZhanyu Xue, Jinchun Xing
Life of this patent
Estimating the term…
Abstract
A method for processing an interphase short circuit is provided, including: when a two-phase or three-phase interphase short circuit occurs in a line, maintaining a fault phase of the line to be conducted and tripping off the remaining fault phases, and artificially grounding another fault phase connected to the fault phase or directly utilizing an existing grounding point; connecting a neutral point or a charged phase of a three-phase ineffectively grounded power supply system other than the fault phase to the ground, so as to form a closed loop with the fault phase and generate a current, and detecting a current duration by a controlled switch. When a certain controlled switch reaches a trigger condition and cuts off the line, a fault is cleared.
Claims12
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.
Dependencies are inferred from the claim text.