Ground fault detection circuit and device
A ground fault detection circuit technology, applied in the field of power electronics, can solve the problems of low ground fault detection accuracy and high cost of ground fault detection, and achieve the effect of improving accuracy
Inactive Publication Date: 2020-02-11
SIEMENS AG
View PDF13 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] In view of this, the purpose of the present invention is to provide a ground fault detection circuit and device to solve the problems of high cost of ground fault detection and low accuracy of ground fault detection caused by parasitic capacitance in the prior art
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] In order to make the purpose, technical solution and advantages of the present invention clearer, the following examples are given to further describe the present invention in detail.
[0029] figure 1 It is a schematic structural diagram of a ground fault detection circuit according to an embodiment of the present invention, please refer to figure 1 , the ground fault detection circuit of this embodiment includes a resistance voltage dividing branch, a signal sampling branch and a DC component extraction branch, and the resistance voltage dividing branch includes a sampling resistor R0 and at least one voltage dividing resistor (n is shown in the figure Divider resistors, R1, R2...Rn), the first end of at least one voltage divider resistor is respectively connected to at least one branch in the circuit to be detected, and the second end of at least one voltage divider resistor is connected in parallel to the first end of the sampling resistor One end is connected, and...
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
An embodiment of the invention provides a ground fault detection circuit and a current conversion or frequency conversion device, and the ground fault detection circuit comprises the following parts of a resistance voltage dividing branch comprising a sampling resistor and at least one voltage dividing resistor, wherein the first ends of the at least one voltage dividing resistor are respectivelyand correspondingly connected to at least one branch in a circuit to be detected, the second ends of the at least one voltage dividing resistor are connected in parallel and then connected to the first end of the sampling resistor, and the second end of the sampling resistor is grounded; a signal sampling branch connected to the sampling resistor for collecting an electric signal on the sampling resistor; and a DC component extraction branch connected to the signal sampling branch for extracting a DC component of the electric signal collected by the signal sampling branch. With the technical solution of the invention, a ground fault can be accurately detected at a low cost and without being affected by spurious capacitance.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a ground fault detection circuit and device. Background technique [0002] The working process of common three-phase inverters, converters and other electrical equipment in IT systems (Isolation terra system, ungrounded systems) includes rectification links, DC bus links and inverter links. Any point in these three links When a ground fault occurs, the equipment will be abnormal, and the equipment should issue an alarm or fault prompt. However, since a single-point ground fault usually does not affect the normal operation of the equipment, the ground fault is detected by detecting the phase-to-phase voltage and the current signal of the main circuit. , it is difficult to judge whether a ground fault has occurred, and it is necessary to use more sophisticated special detection equipment to detect the ground fault, and the detection cost is high; moreover, there are usual...
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 Applications(China)
IPC IPC(8): G01R31/52
CPCG01R27/20G01R31/52
Inventor 薛海芬
Owner SIEMENS AG