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Photoelectric joint transient fault discrimination method

A technology of instantaneous fault and identification method, applied in electrical components, circuit devices, emergency protection circuit devices, etc., can solve the lack of instantaneous and permanent identification methods for arc faults in distribution networks, insufficiency of arc fault response, and increase the risk of distribution network operation. and other problems to achieve the effect of improving power supply reliability, rapid protection action, and rapid action

Pending Publication Date: 2022-03-08
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing instantaneous and permanent fault identification method is to set the protection time. After the switchgear and the ring main unit fail to reach the setting value of the protection device, the protection device will start the corresponding criterion. If the fault duration is not longer than the action time of the protection device , the protection device will return. If the fault duration is longer than the protection device setting time, the outlet will trip. This method is simply selected based on the fault duration, and the criterion is single. If the fault is a permanent fault, it will increase the operation risk of the distribution network and reduce the power supply reliability
The second is to use voltage and current to make instantaneous and permanent judgments. This method is not sensitive enough to arc faults and is greatly affected by the operating mode of the system.
The existing identification of the nature of distribution network faults mainly includes fault type identification or identification, such as intermittent faults, high-resistance faults, etc., and there is a lack of instantaneous and permanent identification methods for distribution network arc faults

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: A photoelectric combined transient fault discrimination method. Single-phase ground faults in switchgears and ring main unit of non-effective grounding system of distribution network are often accompanied by occurrence of arc, and transient faults of distribution network occur frequently. Instantaneous Accurate identification of the nature of permanent faults is of great help to solve the arc protection of distribution network cabinets. The wave recording device collects zero-sequence voltage and zero-sequence current to respectively construct instantaneous and permanent electrical signal criteria based on the interval zero-sequence voltage absolute value integral ratio ΔU and zero-sequence current absolute value integral ratio ΔI; the optical signal acquisition device and the wave recording device collect synchronously For the visible light and ultraviolet light signals, the instantaneous and permanent light signal criteria based on the interval visible li...

Embodiment 2

[0051] Embodiment 2: the test figure of the present invention is as figure 1 As shown, the zero-sequence voltage waveform collected by the wave recording device is as follows figure 2 Shown, calculate now figure 2 The ratio ΔU of the absolute value integral of the zero-sequence voltage of the first half-wave (0-10ms) to the integral of the absolute value of the zero-sequence voltage of the second half-wave (10-20ms) 1 :

[0052]

[0053] ΔU 1 If it is greater than 10, according to the zero-sequence voltage absolute value integral greater than 10, it can be judged as an instantaneous fault by the criterion ΔU.

[0054] The zero-sequence current waveform collected by the wave recording device is as follows: image 3 As shown, now calculate the ratio ΔI of the absolute value integral of the zero-sequence current of the first half-wave (0-10ms) to the integral of the absolute value of the zero-sequence current of the second half-wave (10-20ms) 1 :

[0055]

[0056] Δ...

Embodiment 3

[0064] Embodiment 3: the test figure of the present invention is as figure 1 As shown, the zero-sequence voltage waveform collected by the wave recording device is as follows Figure 6 Shown, calculate now figure 2 The ratio ΔU of the absolute value integral of the zero-sequence voltage of the first half-wave (0-10ms) to the integral of the absolute value of the zero-sequence voltage of the second half-wave (10-20ms) 1 :

[0065]

[0066] ΔU 1 If it is less than 10, calculate the ratio ΔU of the absolute value integral of the second half-wave zero-sequence voltage (10-20ms) and the absolute value of the third half-wave (20-30ms) zero-sequence voltage 2 :

[0067]

[0068] ΔU 2 If it is less than 10, according to the zero-sequence voltage absolute value integral is less than 10, it can be judged as a permanent fault by the criterion ΔU.

[0069] The zero-sequence current waveform collected by the wave recording device is as follows: Figure 7 As shown, now calcula...

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Abstract

The invention relates to a photoelectric joint transient fault discrimination method, and belongs to the technical field of power system relay protection. After a wave recording device detects a fault, zero-sequence voltage and zero-sequence current signals of a power distribution network switch cabinet and a ring main unit are started to be collected as electric signals; the optical signal acquisition device and the wave recording device synchronously acquire visible light and ultraviolet light as optical signals, the optical signals are converted into electric quantity signals, and a criterion of combination of the electric signals and the converted electric quantity signals is constructed to carry out instantaneous permanent fault judgment. The method is suitable for various arc grounding faults occurring in the cabinet body of the power distribution network, the protection criterion is simple and reliable, and the selectivity and the sensitivity are high.

Description

technical field [0001] The invention relates to a method for judging a photoelectric combined instantaneous fault, which belongs to the technical field of electric power system relay protection. Background technique [0002] The distribution network fault proposition is broad and complex, and the distribution network has many branches, complex lines, various loads, and a high incidence of single-phase ground faults. In addition, the neutral point is a non-effectively grounded system. In addition to the overhead line, the faults are more common. Switch cabinets, ring network cabinets and other equipment are also frequent fault points, and most of the faults lead to arc generation. Transient faults can disappear by themselves, and the power grid can resume stable operation after disappearing. However, the causes of transient faults are complicated, and it is difficult to accurately identify and eliminate hidden dangers. When a fault occurs in a switchgear or ring main unit, i...

Claims

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Application Information

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IPC IPC(8): H02H1/00H02H7/22
CPCH02H1/0023H02H7/22
Inventor 束洪春董俊李航韩一鸣宋金朋侯乔戈黄利平唐玉涛
Owner KUNMING UNIV OF SCI & TECH
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