Fault section location method of distribution network based on differential energy ratio

A technology of differential energy ratio and section positioning, applied in the direction of fault location, etc., can solve problems such as failure, high requirements for transformers, neglect of information utilization before faults, etc.

Active Publication Date: 2018-01-12
SHANGHAI JIAO TONG UNIV
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  • Abstract
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Problems solved by technology

[0004] It can be seen that the current methods only use the data after the fault occurs, while ignoring the use of the information before the fault.
At the same time, most positioning methods only consider zero-sequence current information (three-phase information is required), which requires high transformers and complicated information acquisition, and these methods will fail when the data is missing

Method used

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  • Fault section location method of distribution network based on differential energy ratio
  • Fault section location method of distribution network based on differential energy ratio
  • Fault section location method of distribution network based on differential energy ratio

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Embodiment Construction

[0084] The fault waveform required by the present invention comes from the distributed fault section positioning system, and the system architecture is as follows figure 2 shown. The distribution network fault section location system consists of a monitoring master station, a substation (busbar) measurement device, and node fault location devices distributed throughout the distribution line. The fault location node divides the line into several sections topologically, and each node installs three sets of measuring devices to collect the three-phase current and voltage of the line synchronously in real time.

[0085] According to the fault location method invented, different types of faults are set in the 10kV distribution network simulation system. The system structure diagram is as follows image 3 As shown, ①, ②, ③ are section numbers, and faults are set on section ②. The sampling frequency is 20kHz (N = 400 data points per cycle), the fault occurrence time is 0.7s, the ...

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Abstract

The invention discloses a method for locating fault sections of distribution network lines based on differential energy ratios. For ground faults, the phase current difference and phase The voltage difference product feature is used to extract the fault feature quantity, and the differential energy ratio of the whole process is used for positioning. The invention only needs to measure the fault phase current and voltage of the line, the scheme is simple, the applicability is strong, and the sensitivity can still be guaranteed when the high resistance is grounded, and it can well solve the current weak fault current when the single-phase ground fault of the small current grounding system exists , poor reliability, and low sensitivity, and will not introduce interference to the system.

Description

technical field [0001] The invention relates to a method for diagnosing faults of distribution network lines, in particular to a method for locating fault sections of distribution network lines based on differential energy ratios. Background technique [0002] According to statistics, during the operation of the power system, power outages caused by distribution network faults account for more than 95% of the total power outages, of which 70% are caused by single-phase ground faults or busbar faults. The neutral point of domestic and foreign distribution networks widely adopts non-effective grounding (small current grounding) to avoid power supply interruption when a single-phase grounding fault occurs. For single-phase-to-ground faults in distribution networks, due to weak fault characteristics, there has been a lack of reliable fault line selection and location methods. With the improvement of people's requirements for distribution network automation level, it is more urg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 刘亚东刘嘉美罗林根谢潇磊胡琛临盛戈皞江秀臣
Owner SHANGHAI JIAO TONG UNIV
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