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Electric arc stable arcing detection method based on electric signals

A technology of arc stability and detection method, which is applied in the direction of measuring electricity, measuring devices, short-circuit testing, etc., can solve the problems of high requirements for matching equipment, slow action response speed, etc., to ensure safe operation, small data volume, and strong engineering practicability Effect

Pending Publication Date: 2022-03-11
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, scholars in the industry have gradually begun to pay attention to the arc fault inside the switchgear. The traditional switchgear, cable ring network cabinet, and power distribution cabinet protection schemes include transformer backup overcurrent protection, feeder overcurrent protection, and high-impedance busbar protection. There is an action response Power companies such as State Grid and China Southern Power Grid have many concerns about this technology due to slow speed and high requirements for matching equipment.

Method used

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  • Electric arc stable arcing detection method based on electric signals
  • Electric arc stable arcing detection method based on electric signals
  • Electric arc stable arcing detection method based on electric signals

Examples

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Embodiment 1

[0041] Embodiment 1: as figure 2 As shown, a distribution network fault arc test platform with a simulated voltage level of 10kV and an arc gap of 2cm is built, including three parts: fault arc generator, primary high-voltage equipment, and secondary low-voltage data acquisition equipment; in the fault arc generator, The rod-plate structure is adopted, and the electrode gap is set to 2cm, such as image 3 shown. The cathode part of the fault arc generating device is a copper rod with a diameter of 10mm, and the anode is a copper plate with a diameter of 70mm. The primary high-voltage equipment consists of an adjustable voltage source, test inductance, and adjustable resistance; the secondary low-voltage data acquisition part consists of a wave recording device and a high-speed camera.

[0042] like figure 1 As shown, an electric signal-based arc stable arc detection method, the specific steps are:

[0043]Step1: Use a high-voltage probe to measure the high-voltage voltage...

Embodiment 2

[0053] Embodiment 2: as figure 2 As shown, a distribution network fault arc test platform with a simulated voltage level of 35kV and an arc gap of 5cm is built, including three parts: fault arc generator, primary high-voltage equipment, and secondary low-voltage data acquisition equipment; in the fault arc generator, The rod-plate structure is adopted, and the electrode gap is set to 5cm, such as image 3 shown. The cathode part of the fault arc generating device is a copper rod with a diameter of 10mm, and the anode is a copper plate with a diameter of 70mm; the primary high-voltage equipment is composed of an adjustable voltage source, test inductance, and adjustable resistance; the secondary low-voltage data acquisition part is composed of a wave recording device and a high-speed camera composition.

[0054] like figure 1 As shown, an electric signal-based arc stable arc detection method, the specific steps are:

[0055] Step1: Use a high-voltage probe to measure the h...

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Abstract

The invention relates to an electric-arc stable arcing detection method based on an electric signal, and belongs to the technical field of power system relay protection. The method comprises the following steps: acquiring a voltage signal of an arc through a wave recording device at an arc starting moment of an arc fault, and starting an arc light protection device when detecting that a voltage gradient du is greater than a setting value; in the stable arcing stage, zero-sequence transient current signals are collected through a wave recording device, and whether the change trend increment of the zero-sequence transient current increment delta i is larger than a setting value or not is judged; if yes, the electric arc is judged to be in stable arcing, and if not, the electric arc is judged not to be in stable arcing. According to the method, whether the electric arc is in stable arcing or not is judged according to the zero-sequence current increment delta i criterion, and the protection criterion is simple and reliable.

Description

technical field [0001] The invention relates to an electric signal-based arc stable arc detection method, which belongs to the technical field of electric power system relay protection. Background technique [0002] In recent years, with the rapid development of the domestic electric power industry, the switchgear of the medium-voltage distribution network has become the power supply hub of the power supply system, and single-phase grounding faults in the distribution network occur frequently. With non-effective grounding, the ground fault in the switch cabinet is not easy to detect. Complete sets of switchgears are widely used in medium-voltage power distribution systems. There are currently about 8 million sets of medium-voltage switchgears in my country. Due to factors such as the equipment itself and the operating environment, ground faults inside the switchgear frequently occur. Among them, the arc light short circuit inside the switchgear is a frequent and catastrophi...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088G01R31/52
Inventor 束洪春董俊李瑞桂黄华林侯炜杨建平丁心志邵重阳罗琨唐玉涛韩一鸣
Owner KUNMING UNIV OF SCI & TECH
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