Detection type permanent fault discrimination method before phase-to-phase coincidence of power distribution network
A technology of permanent faults and discrimination methods, which is applied in the direction of detecting faults, fault locations, electrical components, etc. according to conductor types, and can solve problems such as blind reclosing of automatic reclosing switches
Active Publication Date: 2021-02-05
XI'AN POLYTECHNIC UNIVERSITY
View PDF8 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The purpose of the present invention is to provide a detection-type method for discriminating permanent faults before phase-to-phase reclosing of distribution network, which solves the problem of blind reclosing of automatic reclosing after phase-to-phase fault of distribution network existing in the prior art
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0045] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0046] The present invention is a detection-type permanent fault discrimination method before the phase-to-phase overlap of the distribution network, such as figure 1 , the specific steps include:
[0047] Step 1: Build an active detection circuit 1 on the line side of the distribution network, and the active detection circuit 1 includes a three-phase grounding switch K d , the additional capacitor C precharged by the DC source DC and the corresponding DC source switch K b with an additional capacitive switch S 1 , S 2 , S 3 , S 4 .
[0048] Step 2: After the three-phase trip of the phase-to-phase fault of the distribution line, connect to the grounding switch K after a fixed delay of 0.1s d Release the power to avoid the residual power of the line from affecting the judgment result.
[0049] Step 3: Then, add the additional charging ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a detection type permanent fault discrimination method before phase-to-phase coincidence of a power distribution network, and the method comprises the steps: 1, building an active detection circuit at a line side of the power distribution network; 2, enabling a grounding switch Kd to be connected for releasing the electric quantity with fixed time delay after three-phase tripping of a phase-to-phase fault of the power distribution line; 3, inputting a charging additional capacitor C into the power distribution network, collecting discharging current data and a current average change rate kj, n, and judging whether a fault loop exists or not according to a fault-free criterion I; 4, after a fault loop is determined, switching an additional capacitor for multiple times for the fault loop, calculating kj and n, judging whether the fault is an instantaneous fault or not is through a permanent fault criterion II, and if the maximum allowable judgment time is not reached, executing the step 5 ; and 5, cutting off the additional capacitor of the line, returning to the step 4 for execution after fixed time delay, and circularly judging until the judgment is finished. According to the invention, the problem of blind reclosing of the automatic reclosure after the power distribution network phase-to-phase fault is solved.
Description
technical field [0001] The invention belongs to the technical field of distribution network protection, and relates to a detection-type method for discriminating permanent faults before phase-to-phase overlap of a distribution network. Background technique [0002] The existing distribution network is usually equipped with three-phase automatic reclosing at the exit of important feeders to realize the rapid recovery of power supply after a phase-to-phase fault, so as to improve the reliability of power supply. However, the three-phase reclosing action with a fixed time limit is blind. When the reclosing is a permanent fault, it will bring the risk of secondary impact to the power distribution system and equipment, and may even further deteriorate the power quality of the power supply. Therefore, in order to better solve the problem of blind reclosing after the phase-to-phase fault of the distribution network, the permanent fault discrimination before the phase-to-phase reclo...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H7/28H02H3/06H02J3/00G01R31/08
CPCH02H7/26H02H7/28H02H7/267H02H1/0007H02H1/003H02H3/066H02J3/00G01R31/086Y04S10/52
Inventor 邵文权刘一璇关欣焦卓
Owner XI'AN POLYTECHNIC UNIVERSITY