Power distribution network single-phase disconnection judging and addressing method based on load measuring and recording system

Abstract

The invention relates to a power distribution network single-phase disconnection judging and addressing method based on a load measuring and recording system. The method comprises the following steps of: I, mounting a load measuring and recording system on a power distribution network feeder line, and acquiring the values of three-phase voltage, current and 3V0 of a pole-mounted transformer from the load measuring and recording system mounted on the power distribution network feeder line at regular time; II, comparing the voltage and current values acquired from the load measuring and recording system mounted on the power distribution network feeder line with the voltage and current values of a power distribution network single-phase disconnection fault database to judge the disconnection fault type; and III, in combination with the single-phase disconnection fault type judged in the step II, performing single-phase disconnection fault addressing by a forward sweeping method or backward sweeping method based on the load measuring and recording system, and performing fault treatment. Compared with the prior art, the method provided by the invention has the advantages that: the correct judgment of the power distribution network single-phase disconnection fault phase and the effective addressing of the fault position can be performed based on the measured data of the load measuring and recording system in combination with the power distribution network single-phase disconnection fault database and the like.

Description

technical field [0001] The invention relates to a power load measurement and recording technology, in particular to a single-phase disconnection determination and addressing method of a distribution network based on a load measurement and recording system. Background technique [0002] In recent years, in order to meet the needs of the distribution network automation system and the refinement of the distribution network under the new situation, the load measurement and recording system has been widely used in the distribution network of various regions. The load measurement and recording system can monitor the voltage, current, active power, reactive power and other information of the low-voltage measurement of the distribution transformer in real time, and send it to the dispatching center at a set time interval for the operator to view and analyze. The biggest difficulty in the analysis and calculation of the traditional distribution network is the collection of load infor...

AI Technical Summary

Problems solved by technology

The disadvantages of the above method are as follows: (1) It is necessary to configure additional negative sequence current or negative sequence voltage filters and transmission devices on the distribution line, which increases the workload of investment, installation and maintenance

(2) No matter it is based on transient zero-mode current or zero-sequence compensation compensation admittance small current grounding method, the mathematical calculation and processing are very complicated and require a long calculation time, which is not convenient for practical application and dispatchers to quickly judge and deal with

(3) Although the nature of the disconnection fault and the name of the disconnection line can be preliminarily determined, it is still impossible to accurately locate the specific location of the fault point, and it is necessary to manually detect the fault point

The dispatching department will generally determine the approximate range of the fault point by testing the lever knife in sections, according to whether the value of 3V0 in the system returns to normal, and then let the line transport or operation team conduct line inspection or measure the three-phase voltage within this range to determine The position of the broken wire, this method of segmented testing of the rod knife is sometimes inaccurate

In summary, existing load logging systems are underdeveloped in handling distribution network incidents

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