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Single-phase fault phase selection method, device and storage medium based on line voltage increase

A single-phase fault, increase the amount of technology, applied in the direction of measuring devices, fault location, measurement of electrical variables, etc., can solve the problem of three-phase asymmetry, to speed up the phase selection speed, improve the accuracy, and ensure the effect of personal safety

Active Publication Date: 2020-12-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the actual operating environment is usually three-phase asymmetry, how to accurately select the phase and line selection under the condition of system imbalance is also a problem that needs to be considered

Method used

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  • Single-phase fault phase selection method, device and storage medium based on line voltage increase
  • Single-phase fault phase selection method, device and storage medium based on line voltage increase
  • Single-phase fault phase selection method, device and storage medium based on line voltage increase

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Experimental program
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Effect test

Embodiment 1

[0073] This embodiment provides a single-phase fault phase selection method based on the increase of the line voltage. The method is applied to a neutral point ungrounded power distribution system. Before starting work, the neutral point ungrounded power distribution system where it is located is in Stable and normal working state, and it is assumed that no fault occurs within three cycles after the device is connected; the phase selection condition of this method is set as: the voltage information before the fault needs to be the one that only includes the unbalanced amount of the neutral point ungrounded distribution system. Three-phase voltage; the voltage information after the fault needs to be a steady-state quantity, and cannot include a transient quantity.

[0074] like figure 1 As shown, the single-phase fault phase selection method in this embodiment includes the following steps:

[0075] S1. Collect the three-phase voltage and line voltage of the busbar of the subst...

Embodiment 2

[0109] like image 3 As shown in the figure, this embodiment provides a single-phase fault phase selection device based on the increase of the line voltage. The device is applied to a neutral point ungrounded power distribution system, which includes a collection module 301, a first calculation module 302, a first A judgment module 303, an extraction module 304, a second calculation module 305, a sorting module 306, a generation module 307, a first phase selection module 308, an enqueue module 309, a second judgment module 310, a first return module 311, and a third judgment Module 312, output module 313, second phase selection module 314 and second return module 315, the specific functions of each module are as follows:

[0110] The collection module 301 is used to collect the three-phase voltage and line voltage of the busbar of the substation.

[0111] The first calculation module 302 is configured to calculate the zero-sequence voltage of the bus according to the three-ph...

Embodiment 3

[0132] This embodiment provides a computer device, the computer device is a computer, such as Figure 5 As shown, it is connected by a system bus 501 to a processor 502, memory, input device 503, display 504 and network interface 505 for providing computing and control capabilities, the memory including non-volatile storage medium 506 and internal memory 507, the non-volatile storage medium 506 stores an operating system, a computer program and a database, the internal memory 507 provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium, and the processor 502 executes the memory stored in the memory. During the computer program, the single-phase fault phase selection method of the above-mentioned embodiment 1 is realized, as follows:

[0133] Collect the three-phase voltage and line voltage of the busbar of the substation;

[0134] According to the three-phase voltage of the bus, calculate the zero-sequence v...

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Abstract

The invention discloses a single-phase fault phase selection method, device and equipment based on line voltage increment and a medium. The method comprises the following steps: acquiring bus three-phase voltage and line voltage of a transformer substation; calculating bus zero-sequence voltage according to the bus three-phase voltage; judging whether a single-phase earth fault exists or not according to the bus three-phase voltage and the zero-sequence voltage at the current moment; if so, extracting a bus three-phase line voltage before the fault; calculating the increment of the line voltage amplitude according to the bus three-phase line voltage at the current moment and the bus three-phase line voltage before the fault; sorting the increment of the line voltage amplitudes from large to small to obtain an increment maximum value, an increment intermediate value and an increment minimum value in sequence; generating an algorithm criterion according to the maximum value of the increment, the intermediate value of the increment and the minimum value of the increment; and selecting a fault phase in the three phases according to the result of the algorithm criterion. According to the method, the unbalance amount of a neutral point ungrounded power distribution system before the fault is considered, and high phase selection accuracy is achieved in the actual fault.

Description

technical field [0001] The invention relates to a single-phase fault phase selection method, device, equipment and medium based on the increase of line voltage, and belongs to the field of fault phase selection of 10kV distribution network. Background technique [0002] Compared with neutral point grounding via arc suppression coil and neutral point grounding via small resistance, the neutral point ungrounded system has great advantages in power supply reliability, etc., but there are still intermittent arc overvoltage, phase selection and selection. Problems such as low line accuracy. The use of active intervention arc suppression technology such as "arc suppression cabinet" not only transfers the fault point current through the grounding of the busbar, but also plays a good fault arc suppression function, and provides a prerequisite for active line selection. Therefore, if the correct phase selection can be ensured, the active intervention arc suppression can greatly ensu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088
Inventor 刘文泽谭炜豪
Owner SOUTH CHINA UNIV OF TECH
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