The Method of Determining the Minimum Current-carrying Value of Distribution Lines
A technology of distribution lines and determination methods, applied in the fields of electrical digital data processing, special data processing applications, instruments, etc.
Active Publication Date: 2018-04-06
STATE GRID CORP OF CHINA +1
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[0007] The main purpose of the present invention is to provide a method for determining the minimum current-carrying value of distribution lines, so as to solve the problem of over- or under-estimated load-carrying capacity of distribution lines in the prior art
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[0020] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0021] Such as figure 1 As shown, the method for determining the minimum current-carrying value of distribution lines includes: Step S1: Obtain line equipment parameters, line parameters include conductor rated current-carrying value, CT rated current and protection limit value; Step S2: Divide the line into multiple conductors segment, obtain the number of loads carried by each wire segment, and calculate the K value of each wire segment, and the K value is the ratio of the rated current-carrying value of the wire of the wire segment to the number of loads carried by the wire segment; step S3: The minimum value of the K value of each wire segment is multiplied by the load of the entire line a...
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The invention provides a determination method for a minimum current carrying value of a power distribution line. The determination method comprises the following steps: step S1, obtaining line equipment parameters, wherein the line equipment parameters comprise a lead wire rated current carrying value, CT rated current and a protection limitation value; step S2, dividing the line into a plurality of lead wire sections and obtaining an on-load quantity of each lead wire section; calculating a K value of each lead wire section, wherein the K value is a specific value between the lead wire rated current carrying value of each lead wire section and the on-load quantity of the corresponding lead wire section; step S3, multiplying the minimum value in the K values of the plurality of lead wire sections by the on-load quantity of the whole line to be used as the lead wire rated current carrying value of the line; step S4, taking the minimum value in the lead wire rated current carrying value of the line, the CT rated current and the protection limitation value as the minimum current carrying value of the power distribution line. The K value of the weakest lead wire section is multiplied by the on-load quantity of the whole line to obtain the lead wire rated current carrying value of the line, so that the problem in the prior art that the on-load capability of the power distribution line is overestimated or underestimated is solved.
Description
technical field [0001] The invention relates to a method for determining rated current, in particular to a method for determining the minimum current-carrying value of a distribution line. Background technique [0002] The minimum current-carrying components of 10kV distribution lines (including overhead lines, overhead cable hybrid lines, and pure cable lines) refer to the comprehensive consideration of various equipment on the entire overhead line, including substation 10kV circuit breakers, 10kV switch cabinets, and 10kV current transformers. , overhead line conductors or cable equipment, etc., to obtain the bottleneck and restrictive link of the line with load, the equipment in this link is the minimum current-carrying element of the line, and the rated current of the equipment in this link is the minimum load of the line stream value. The load rate of the 10kV distribution line is obtained by dividing the current value of the line by the minimum current carrying value ...
Claims
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IPC IPC(8): G06Q50/06G06F17/30
CPCG06Q10/047G06Q50/06Y04S10/50
Inventor 于化鹏李晓东徐震
Owner STATE GRID CORP OF CHINA