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Single-phase fault phase selection method and device based on line voltage increment, equipment and medium

A single-phase fault, increasing the amount of technology, applied in the measurement device, fault location, measurement of electrical variables and other directions, can solve the three-phase asymmetry and other problems, to speed up the speed of phase selection, improve the accuracy, and ensure the effect of personal safety

Active Publication Date: 2020-04-17
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 and device based on line voltage increment, equipment and medium
  • Single-phase fault phase selection method and device based on line voltage increment, equipment and medium
  • Single-phase fault phase selection method and device based on line voltage increment, equipment and medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] This embodiment provides a single-phase fault phase selection method based on the increase of line voltage. This method is applied to the neutral point ungrounded power distribution system. Before starting work, the neutral point ungrounded power distribution system is in the Stable 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 follows: the voltage information before the fault needs to contain only the unbalanced amount of the neutral point ungrounded power distribution system Three-phase voltage; the voltage information after a fault needs to be a steady state quantity, and cannot contain a transient quantity.

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

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

[0076] The bus three-...

Embodiment 2

[0109] Such as image 3 As shown, this embodiment provides a single-phase fault phase selection device based on the increase of the line voltage. 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 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 bus three-phase voltage and line voltage of the substation.

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

[0112] The first judging module 303 is configured to judge whether there is a single-phase ground fault according to the three-phase voltage and the z...

Embodiment 3

[0132] This embodiment provides a computer device, the computer device is a computer, such as Figure 5 As shown, a processor 502, a memory, an input device 503, a display 504 and a network interface 505 are connected through a system bus 501, the processor is used to provide computing and control capabilities, and the memory includes a non-volatile storage medium 506 and an 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 During computer program, realize the single-phase failure phase selection method of above-mentioned embodiment 1, as follows:

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

[0134] According to the bus three-phase voltage, calculate the bus zero-sequence voltage;

[01...

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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 line voltage increase, and belongs to the field of fault phase selection of 10kV distribution network. Background technique [0002] The neutral point ungrounded system has great advantages in terms of power supply reliability and other aspects compared with the neutral point grounded through the arc suppressing coil and the neutral point grounded through a small resistance, but there are still intermittent arc overvoltages, phase selection and selection. The problem of low line accuracy. The active intervention arc suppression technology such as "arc suppression cabinet" not only transfers the current at the fault point through the bus grounding, but also plays a good role in fault arc suppression, and provides a prerequisite for active line selection. Therefore, if the correct phase selection can be ensured, the active intervention arc suppres...

Claims

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Application Information

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Patent Type & Authority Applications(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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