Power transmission line capacitance parameter measurement circuit and method
A transmission line and parameter measurement technology, which is applied in the directions of capacitance measurement, electric variable measurement, resistance/reactance/impedance measurement, etc., can solve the problems of on-site work safety hazards, electric shock injuries, hidden dangers, etc., and achieve strong flexibility and adaptability , Reduce the induced voltage, improve the effect of safety
Pending Publication Date: 2020-04-14
STATE GRID SHANDONG ELECTRIC POWER +1
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, in actual use, when the different frequency method is used to measure the capacitance parameters of the transmission line, the end of the power outage line is open, and the power outage line has a high induced voltage due to the electromagnetic induction of the nearby live line, sometimes up to tens of thousands of volts. The induced voltage will cause large vibration and noise in the internal components of the different-frequency power supply, and even burn out, which will make it impossible to perform line testing. Safety Hazards and Hazards
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
[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.
[0023] The invention provides a transmission line capacitance parameter measurement circuit, such as figure 2 As shown, in the blackout line L 2 A capacitor bank C connected in series with the earth m and adjustable resistor R, while the power-off line L 2 A voltage transformer PT is connected to the ground, and the voltage transformer PT is connected in parallel with the different frequency power supply M used to measure the capacitance parameters of the transmission line. capacitor bank C m and an adjustable resistor R on the line to set the switch to a K 1 , switch 2 K is set on the line of voltage transformer PT 2 , set the switch three K on the line of the different frequency power supply 3 , Switch II K 2 and switch three K 3 Can share a SPDT switch.
[0024] 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 discloses a power transmission line capacitance parameter measurement circuit and method. A capacitor bank and an adjustable resistor are connected in series between a power failure lineand the ground. Meanwhile, a voltage transformer is connected between the power failure line and the ground, the voltage transformer is connected with a pilot frequency power supply used for measuring capacitance parameters of the power transmission line in parallel, a first switch is arranged in a line of the capacitor bank and the adjustable resistor, a second switch is arranged in a line of the voltage transformer, and a third switch is arranged in a line of the pilot frequency power supply; the capacitor bank is formed by connecting a plurality of capacitors in parallel, and a fourth switch is arranged in a circuit of each capacitor. The circuit and the method disclosed by the invention can effectively reduce the induced voltage of the power failure line and improve the safety of thetest process.
Description
technical field [0001] The invention relates to the technical field of power equipment measurement, in particular to a circuit and method for measuring capacitance parameters of transmission lines. Background technique [0002] Transmission lines are an important part of the power system. With the rapid development of the power system, there are more and more UHV transmission lines due to the advantages of UHV technology, such as saving line corridors, high economic cost performance, and low loss. In order to meet the national economic development and social demand for electricity and save the construction cost of transmission lines, there are more and more lines and parallel lines erected on the same tower with double circuits, four circuits or even more circuits. [0003] The different-frequency power supply test method is to cut off the power of the line to be tested. The advantage is that it can effectively avoid the influence of the line power frequency induction curren...
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): G01R27/26
CPCG01R27/2605
Inventor 陈伟坤刘鹏吴寿山雷敏孙昭昌白志轩张倩葛惠阳
Owner STATE GRID SHANDONG ELECTRIC POWER