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Method and device for detecting trap charge of capacitor potential transformer

A technology for voltage transformers and capacitance detection, which is applied in the field of power systems, can solve problems such as residual charge hazards, and achieve timely and accurate results

Active Publication Date: 2018-12-18
SIEMENS POWER AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the existence of residual charges is very dangerous

Method used

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  • Method and device for detecting trap charge of capacitor potential transformer
  • Method and device for detecting trap charge of capacitor potential transformer
  • Method and device for detecting trap charge of capacitor potential transformer

Examples

Experimental program
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Embodiment 1

[0071] This embodiment provides a method for detecting the residual voltage state of a capacitor voltage transformer, and its execution subject is a device for detecting the residual voltage state of the capacitor voltage transformer. The device can be a computer, iPad and other equipment.

[0072] Such as figure 2 As shown, it is a schematic flow chart of the method for detecting the residual voltage state of the capacitive voltage transformer according to this embodiment. The method includes:

[0073] Step 201, acquiring first differential values ​​of at least one group of adjacent first sampling signals at an output terminal of a capacitive voltage transformer.

[0074] In this embodiment, two adjacent sampling signals at the output end of the capacitive voltage transformer are used as a group of adjacent first sampling signals. In this embodiment, multiple groups of such adjacent first sampling signals may be acquired within a continuous time period. The first samplin...

Embodiment 2

[0081] This embodiment makes further supplementary descriptions of the method for detecting the residual voltage state of the capacitive voltage transformer in the first embodiment.

[0082] Such as image 3 As shown, it is a schematic flow chart of the method for detecting the residual voltage state of the capacitive voltage transformer according to this embodiment. The method includes:

[0083]Step 301 , acquire first differential values ​​of at least one group of adjacent first sampling signals at an output terminal of a capacitive voltage transformer, and execute step 302 .

[0084] This step is consistent with step 201 and will not be repeated here.

[0085] Step 302, within a continuous preset time period, if it is determined that the absolute value of the first difference between the two first differential values ​​in each group is less than a first preset threshold, and each first differential value The absolute values ​​of are all smaller than a second preset thres...

Embodiment 3

[0096] This embodiment provides a further supplementary description of the method for detecting the residual voltage state of the capacitive voltage transformer in the foregoing embodiments.

[0097] Such as Figure 4 Shown is a schematic flow chart of the method for the residual voltage state of the capacitive voltage transformer according to this embodiment. The method includes:

[0098] Step 401, judging whether the absolute value of the third difference between the second differential values ​​corresponding to two adjacent second sampling signals at the output end of the capacitive voltage transformer is less than a fourth preset threshold, and the two Whether the absolute values ​​of the second differential values ​​are all smaller than a fifth preset threshold, and if the judgment result is yes, step 402 is executed.

[0099] In this step, the second differential values ​​of two adjacent second sampling signals at the output end of the capacitive voltage transformer ma...

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PUM

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Abstract

The invention relates to a method and a device for detecting the trap charge of a capacitor potential transformer. The method comprises the following steps that: obtaining the first differential values of at least one group of adjacent first sampling signals of the output end of the capacitor potential transformer; and according to each group of first differential values, determining whether the capacitor potential transformer is under trap charge or not. By use of the method, whether the capacitor potential transformer is under the trap charge or not can be quickly determined.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method and a device for detecting the residual voltage state of a capacitive voltage transformer. Background technique [0002] Capacitor Potential Transformer (CPT: Capacitor Potential Transformer) is mostly used in high-voltage power grids to monitor the voltage signal of the primary side (high-voltage side) in the power grid. figure 1 A schematic diagram of a typical capacitive voltage transformer is shown. Such as figure 1 As shown, the capacitive voltage transformer CPT 10 is connected between the primary side (primary) equipment 20 and the secondary side (Secondary) equipment 30 in the power system, and is used to convert the obtained primary side high voltage Uprim into the secondary side low voltage Usec, and sent to the secondary side equipment 30 for further analysis. Here, the primary-side device 20 is a device for generating and using electric energy, such as a high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 赵书耀李建生杨成孙旋
Owner SIEMENS POWER AUTOMATION