Harmonic analysis and three-phase imbalance monitoring method based on intelligent CT

A harmonic analysis and intelligent technology, applied in the field of power equipment, can solve the problem of making full use of the data that has not been collected, and achieve the effect of small calculation amount, easy implementation and good engineering practicability.

Pending Publication Date: 2021-05-28
QINGDAO TOPSCOMM COMM
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Problems solved by technology

The smart current transformer can calculate the current value locally and upload it to the collector, but this process does not make full use of

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  • Harmonic analysis and three-phase imbalance monitoring method based on intelligent CT
  • Harmonic analysis and three-phase imbalance monitoring method based on intelligent CT
  • Harmonic analysis and three-phase imbalance monitoring method based on intelligent CT

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Embodiment Construction

[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] The smart current transformer has a local harmonic analysis function, which can analyze the harmonic content within the 21st order, and record the harmonic curves of each order every 15 minutes (recording 96 points a day), and calculate the total harmonic distortion rate THD. Report an alarm event when the harmonic content preset threshold.

[0033] The functions included in the wave analysis: calculate the harmonic content, and record each harmonic curve every 15 minutes; calculate the total harmonic distortion rate THD; when the harmonic content preset threshold, report an alarm event.

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Abstract

The invention specifically discloses a harmonic analysis and three-phase imbalance monitoring method based on intelligent CT. The method comprises the steps of configuring a master-slave mode of an A-phase intelligent CT, a B-phase intelligent CT and a C-phase intelligent CT, obtaining information of a slave-mode intelligent CT through the master-mode intelligent CT, and calculating a current effective value; calculating the nth harmonic content HRIn of each phase of current and the total harmonic distortion rate THD of the current, and recording a harmonic content curve; and calculating the average value of the three-phase current and the maximum value of the difference between the three-phase current value and the average current, calculating the unbalance degree Ru, and when the unbalance degree or the harmonic content exceeds a preset threshold value, reporting an alarm event to a collector. According to the invention, the three-phase unbalance degree and the harmonic content can be analyzed and monitored locally, and the analysis result is uploaded to an acquisition terminal and a master station. The collector or the master station does not need to carry out complex data calculation and analysis, so that resources of the collector and the master station can be greatly saved.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to an intelligent CT-based harmonic analysis and three-phase unbalance monitoring method. Background technique [0002] Current transformer CT is an instrument that converts a large current on the primary side into a small current on the secondary side based on the principle of electromagnetic induction. It is widely used in various industries, such as power grids, mining, metallurgy, rail transit, and ports. Logistics etc. Usually the current transformer is only used as a tool for current measurement, but it has a large number of installations and a wide range of applications. Due to this feature, the deepening application of the current transformer will be very promising. With the complexity of the power grid system, the hazards of three-phase unbalance and high-order harmonics cannot be ignored. We can tap the internal potential of current transformers, monitor line cond...

Claims

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Application Information

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IPC IPC(8): H02J13/00H02J3/01H02J3/26G01R23/16G01R29/16
CPCH02J13/00002H02J13/00022H02J3/01H02J3/26G01R23/16G01R29/16Y04S40/126Y02E40/50Y02E40/40Y02E60/00
Inventor 赵传强王天宇姚兴东杨晓源史瑞圻姜文赵磊
Owner QINGDAO TOPSCOMM COMM
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