A method for measuring the eccentricity error of each phase core wire current of a three-core power cable with a magnetic sensor
A power cable and magnetic sensor technology, applied in the direction of measuring current/voltage, only measuring current, measuring electric variables, etc., can solve problems such as measurement error eccentricity error, and achieve accurate measurement, accurate measurement and calculation, and high practical value.
Active Publication Date: 2020-07-14
STATE GRID JIBEI ELECTRIC POWER CO LTD TANGSHAN POWER SUPPLY CO
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, when implementing this method, the measurement circle where the three sensors are located must be concentric with the circle composed of the three-phase core wires of the cable and the cable, otherwise, there will be a corresponding measurement error - eccentricity error
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
[0018] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.
[0019] A method for measuring the eccentricity error of each phase core wire current of a three-core power cable with a magnetic sensor, comprising the following steps: (1) installing three magnetic sensors on the surface of the three-core power cable that are aligned with the three-phase core wires and have a mutual difference of 120°. Sensor; (2) At the 0° position, measure the function of the tangential magnetic induction intensity generated by the current along the circumferential direction as a function of time; (3) Rotate the three magnetic sensors 180° along the circumferential direction of the cable installation surface, and measure The magnetic induction intensity of each phase core wire current of the three-core power cable along the circumference of the installation plane at three new positions; (4) use the peak value of the magnetic i...
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 invention relates to a method for measuring the eccentricity error of each phase core wire current of a three-core power cable by a magnetic sensor, and belongs to the technical field of current measurement methods. The technical solution is: rotate the three magnetic sensors 180° along the circumference of the installation surface, and measure the magnetic induction intensity generated by the current of each phase core wire of the three-core power cable at three new positions along the circumference of the installation plane. By solving the nonlinear equations, the size of the eccentricity error and the value of the core wire current of each phase of the three-core power cable can be determined under the condition of considering the eccentricity error. The beneficial effects of the present invention are: the eccentricity error of each phase core wire current of the three-core power cable measured by the magnetic sensor can be evaluated, and when there is a deviation between the centers of the three magnetic sensors and the center of the three-core power cable, the three-magnetic sensor method The defect of low accuracy when measuring the current of each phase core wire of a three-core power cable, that is, based on this technology, a more accurate measurement of the current of each phase core wire of a three-core power cable can be realized, which has high practical value.
Description
technical field [0001] The invention relates to a method for measuring the eccentricity error of each phase core wire current of a three-core power cable by a magnetic sensor, and belongs to the technical field of current measurement methods. Background technique [0002] Three-core power cables are often used in power transmission projects below 35kV. Generally, the A, B, and C three-phase core wires of the three-core power cable are evenly distributed along a certain circle at intervals of 120°, and the three-phase core wires use a common shielding layer. In the operation of the power system, it is of great significance to monitor the current of each phase core wire of the power cable. In principle, the operating status of the power cable can be evaluated to ensure its normal operation by monitoring the change of the core wire current of each phase of the three-core power cable in real time. [0003] However, the traditional current monitoring method based on the princip...
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): G01R19/00
CPCG01R19/0092
Inventor 袁燕岭董杰高岭赵伟李世松李凯特张建军甘景福田新成陈昕李岩孟静李楠焦扬贾昌帅刘兰兰
Owner STATE GRID JIBEI ELECTRIC POWER CO LTD TANGSHAN POWER SUPPLY CO