Current Transformer
A current transformer and current technology, which is applied in the direction of inductors, transformer/inductor cores, transformer/inductor coils/windings/connections, etc., can solve the problem of difficult to achieve independent measurement of differential mode current, insufficient accuracy of differential mode current, etc. question
Active Publication Date: 2019-10-25
HUAWEI DIGITAL TECH SUZHOU
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Current transformers can be used to detect the differential mode current and common mode current in the energized line, however, in the actual circuit, the differential mode current and the common mode current coexist in the energized line, because the differential mode current and the common mode current flow through the same line , the existence of the common mode current affects the output differential mode current of the current transformer, it is difficult to realize the independent measurement of the differential mode current, and the capture of the differential mode current is not accurate enough
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0028] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
[0029]In some current schemes, in order to realize independent measurement of differential mode current, two positive and negative primary windings are usually set in the current transformer to suppress the common mode current. see Figure 1-Figure 2 , Figure 1-Figure 2 Some schemes of current transformers for detecting differential mode current in the prior art are shown.
[0030] The first option is as figure 1 As shown, the current transformer only includes the magnetic core and the secondary winding. When the current transformer is connected to the circuit, the first cable through which the positive current flows is positively penetrated and the second cable through which the negative current flows is The two cables are inserted in reverse. In this solution, if the first cable and the second...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The present application provides a current transformer, including a magnetic core, a first primary winding, a second primary winding, and a first secondary winding, wherein: the magnetic core includes a first closed magnetic circuit and a second closed magnetic circuit, and the first The closed magnetic circuit is formed by connecting the first magnetic core structure with the second magnetic core structure, the second closed magnetic circuit is formed by connecting the first magnetic core structure with the third magnetic core structure, and the first magnetic core structure is the first closed magnetic circuit and the second magnetic core structure. The common magnetic core structure of the second closed magnetic circuit; the first primary winding passes through the first closed magnetic circuit, and the second primary winding passes through the second closed magnetic circuit; the first secondary winding is wound on the first magnetic core structure Above; the magnetic flux generated by the differential mode current flowing through the first primary winding and the second primary winding is superimposed on the first magnetic core structure, and the common mode current flowing through the first primary winding and the second primary winding generates The magnetic fluxes cancel each other out on the first core structure. By adopting the solution of the present application, independent measurement of differential mode current and common mode current can be realized.
Description
technical field [0001] This application relates to electronic components, and more particularly to current transformers. Background technique [0002] Photovoltaic power generation system refers to a power generation system that uses solar cells to directly convert solar energy into electrical energy. In the process of using photovoltaic power generation system to generate electricity, there will be a risk of DC arcing. Arc-fault circuit interrupter (AFCI) is usually used to identify the presence of DC arcing in photovoltaic power systems, so as to eliminate the risk. AFCI needs to accurately capture the differential mode current noise signal generated during the arcing process . [0003] In the circuit, by connecting the primary winding of the current transformer in series in the energized line that needs to measure the current, according to the detected magnitude of the current flowing through the secondary winding of the current transformer, the current flowing through t...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H01F27/24H01F27/28H01F27/30H01F38/30
CPCH01F27/24H01F27/28H01F27/2895H01F27/306H01F38/30H01F2038/305H01F27/2823G01R15/183
Inventor 石磊薛明雨叶飞张俊
Owner HUAWEI DIGITAL TECH SUZHOU