Power distribution network line constant value on-off detection method and system based on constant value coordination diagram

Abstract

The invention discloses a power distribution network line constant value on-off detection method and system based on a constant value coordination diagram. The method comprises the steps of: dividingmulti-section protection according to the superior-subordinate relation of protection devices in a transformer substation wiring diagram; calculating action current and action time limit of each section of protection by adopting a distance protection conversion method to obtain a constant value of each section of protection, synchronously marking the constant value and tripping logic in the transformer substation wiring diagram, and constructing a constant value matching diagram; and controlling the on-off operation of the power supply side protection device and the power utilization side protection device according to the fixed value matching graph and the belt stringing mode between the transformer substations. By dividing multi-segment protection, a distance protection conversion methodis adopted to calculate protection constant values in a segmented mode, and the efficiency of constant value calculation is improved; and a constant value matching graph is used to assist in controlling the on-off operation of the protection device, thereby reducing the line patrol operation and maintenance time, reducing the workload, increasing the power supply amount, and guaranteeing the power supply safety and reliability.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a detection method and system for fixed-value commissioning and withdrawal of distribution network lines based on a fixed-value coordination diagram. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] At present, for the operation and maintenance process of the distribution network, the switching operation of the protection device in the distribution network is controlled through the setting value setting of the protection device, so as to avoid the occurrence of safety accidents in the distribution network; for the setting value of the protection device to be adjusted , it is necessary to refer to the fixed value of its adjacent upper and lower protection devices, and calculate the fixed value according to the preset rules; in the ...

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Problems solved by technology

[0003] At present, for the operation and maintenance process of the distribution network, the switching operation of the protection device in the distribution network is controlled through the setting value setting of the protection device, so as to avoid the occurrence of safety accidents in the distribution network; for the setting value of the protection device to be adjusted , it is necessary to refer to the fixed value of its adjacent upper and lower protection devices, and calculate the fixed value according to the preset rules; in the prior art, most of them use manual calculations to judge the specific operation of the power grid when the power point is connected. However, the fixed value calculation takes a long time, which affects power transmission, and there is a problem of timeliness of fixed value setting, and manual calculation cannot guarantee accuracy; in addition, for high-voltage and UHV power grid systems, the fixed value calculation software can be used to calculate the fixed value value, but this method cannot be applied to the 10KV power grid system, and it still cannot guarantee the accuracy of the calculation of the protection setting value and the accuracy of switching on and off of the protection device according to the setting value control

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