Single-phase ground fault detection method, system, terminal and readable storage medium of a small resistance grounding system
A single-phase grounding fault, small resistance grounding technology, applied in the single-phase grounding fault detection method, terminal and readable storage medium, system field, can solve the problem that the fault line is difficult to effectively remove, the fault characteristics are weak, and the high resistance fault is difficult to perceive in time and other problems, to achieve the effect of single-phase high-resistance grounding protection, efficient detection and identification, and easy implementation and realization.
Active Publication Date: 2022-04-01
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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However, when the transition resistance reaches hundreds of ohms or even thousands of ohms, the bus zero-sequence voltage will be lower than the zero-sequence protection start-up or action threshold, the fault current will be significantly smaller, the fault characteristics will be extremely weak, and the high-resistance fault will be difficult to detect in time. It is difficult to effectively cut the line
Due to the concentration of urban population, when a single-phase high-resistance grounding fault occurs in a small-resistance grounding system, it is very easy to cause personal electric shock and expand the scope of the accident.
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[0036] A single-phase ground fault detection method for a resistance grounding system provided by the present invention can detect a single-phase high-resistance ground fault in a small-resistance grounding system in time. The following will take a single-phase high-resistance ground fault as an example to further illustrate the present invention .
[0037] Such as figure 1 As shown, the distribution network applying the method of the present invention is a 10kV single-ended power supply radial simulation model. There are 5 feeders in the figure, and the feeder lengths are respectively 10km, 20km, 10km, 19km, 6km, wherein feeder 1 and 2 are Overhead-cable hybrid line, feeder lines 3 and 4 are overhead lines, and feeder line 5 is a cable line. The neutral point of the system is grounded through a small resistance through the grounding transformer, and the small resistance R N The value is 10Ω, E z A controllable voltage source connected to the neutral point of the distributi...
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The invention discloses a single-phase grounding fault detection method, system, terminal and readable storage medium of a small-resistance grounding system. The amplitude of the zero-sequence voltage of the busbar; wherein, if the amplitude of the zero-sequence voltage of the busbar suddenly increases and lasts for at least T, connect the high-frequency low-voltage power supply at the neutral point of the system; S2: collect and connect the high-frequency low-voltage power supply The zero-sequence current sequence of each feeder is obtained from the zero-sequence current of each feeder; S3: Identify the fault line based on the zero-sequence current sequence of each feeder, where the power frequency component in the zero-sequence current of the fault line is greater than the high frequency component The theoretical power frequency component in the zero-sequence current is zero, and the actual power frequency component is smaller than the power frequency component of the faulty line. The invention can sense the single-phase high-resistance grounding fault of the small-resistance grounding system in time, and the method is simple to implement, strong in applicability, and easy to popularize.
Description
technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a single-phase ground fault detection method, system, terminal and readable storage medium of a small resistance grounding system. Background technique [0002] The small-resistance grounding system is mainly used in the distribution network of large coastal cities in my country. When a single-phase low-resistance grounding fault occurs in the system, the protection device can quickly and accurately select the line, and sensitively cut off the faulty line or faulty section, which can prevent the system from continuing to be faulty. run. However, when the transition resistance reaches hundreds of ohms or even thousands of ohms, the bus zero-sequence voltage will be lower than the zero-sequence protection start-up or action threshold, the fault current will be significantly smaller, the fault characteristics will be extremely weak, and the ...
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IPC IPC(8): G01R31/52
CPCG01R31/52
Inventor 汤涛周宇罗春辉曾祥君李泽文黎宇翔孙博宁王宇汛
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY