Method for detecting inrush current distortion of transformer based on Rogowski coil

A technology of Rogowski coil and detection method is applied in the field of judging the abnormal causes of transformers and in the field of inrush current distortion detection of transformers based on Rogowski coils, which can solve the problems of delay in action, prone to malfunction, and failure to fully reflect the inrush current distortion, so as to reduce calculation effect of error

Inactive Publication Date: 2012-01-18
江苏金思源电气有限公司 +1
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Problems solved by technology

Waveform symmetry can only be applied to even-order harmonic restraint under the condition of symmetrical inrush current, and it will only appear in some specific cases, and when the transformer is over-excited, although the excitation current waveform is symmetrical, it is also Unable to use waveform symmetry method to distinguish exc

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  • Method for detecting inrush current distortion of transformer based on Rogowski coil
  • Method for detecting inrush current distortion of transformer based on Rogowski coil
  • Method for detecting inrush current distortion of transformer based on Rogowski coil

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Example Embodiment

[0034] Example one

[0035] The main process of the Rogowski coil-based transformer inrush current distortion detection method of this embodiment is as follows figure 1 As shown, it is composed of Rogowski coil measurement link, analog-to-digital conversion and filtering link, and distortion calculation output link. The specific steps of each link are as follows:

[0036] 1. The Rogowski coil is used in the measurement section to measure the large current on the primary side of the transformer , Get the differential voltage signal ;

[0037] 2. Will Send into analog-to-digital conversion and filtering (similar to the existing technology, there are many mature methods, no further details) to obtain the digital signal after processing ( ; The number of sampling points in a cycle);

[0038] 3. Judge whether there is an abnormal current according to the criterion of the abnormal current judgment in the differential protection. If there is an abnormal current, enter the calculation...

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Abstract

The invention relates to a method for detecting inrush current distortion of a transformer based on a Rogowski coil, which belongs to the technical field of relay protection of electric power systems. The method comprises the following steps of: measuring primary side current of the transformer to acquire a differential voltage analog signal; acquiring a corresponding differential voltage digitalsignal; judging whether abnormal current occurs or not; performing cosine window-added Fourier transform on the differential voltage digital signal to solve effective values of every-time harmonic waves; calculating the degree of distortion, namely judging whether inrush current occurs or not according to the degree of distortion, and the like. By the method, the conditions that incorrect tripping of differential protection during on-load switch-on of the transformer is prevented and exciting current and fault current are strictly distinguished are ensured, a criterion value has extremely high redundancy, and the degree of distortion is accurately and reliably determined.

Description

technical field [0001] The invention relates to a method for discriminating abnormal causes of transformers, in particular to a Rogowski coil-based method for detecting inrush current distortion of transformers, which belongs to the technical field of relay protection for power systems. Background technique [0002] The Rogowski coil is a kind of wire that is evenly wound on a non-magnetic material frame with a uniform cross-section, so that the wire with a large current passes through the center of the coil vertically, and is induced by the change of the magnetic flux generated by the current-carrying conductor under test. A measuring device that produces a voltage signal that can respond to the magnitude of the measured current. The voltage signal induced by the secondary side is the differential amount of the large current on the primary side, so the Rogowski coil has differential characteristics. [0003] In today's transformer protection, due to the good performance of...

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Application Information

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IPC IPC(8): G01R31/00G01R23/16
Inventor 叶曙光郭泉贺枫张志刚李春王宇森常新平汪斌
Owner 江苏金思源电气有限公司
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