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Overvoltage measuring sensor for overhead transmission line based on coupling electric field

An overhead transmission line and voltage measurement technology, which is applied in the direction of measuring current/voltage, voltage divider, measuring device, etc., can solve the problem of reducing the electrical performance of voltage dividing capacitors and matching resistors, failing to monitor overvoltage of overhead transmission lines, and destroying voltage division Problems such as capacitors and matching resistors have been eliminated to achieve the effects of eliminating potential safety hazards, facilitating popularization and application, and good versatility

Active Publication Date: 2012-10-10
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of the sensor are: ① Since the sensor is installed under the overhead transmission line, it is fixed on the tower by bolts and nuts, and it is 1~30m away from the overhead transmission line.
When the distance between the sensor and the overhead transmission line is more than 15m, the coupling capacitance value between the sensing plate and the overhead transmission line is far away, which leads to an excessively large voltage division ratio, resulting in a small overvoltage signal and making the collected data signal noisy. lower than
②The sensing metal plate of the sensor is a square or round flat plate, which is very easy to accumulate dirt, water, or even ice on the surface, resulting in a change in the sensor’s partial pressure ratio, causing distortion of the measured overvoltage waveform, reducing the sensor’s measurement performance, and resulting in inaccurate Reduce the accuracy of overvoltage measurement
③The accumulated water on the induction plate or the ice water on its surface after the melting of ice can easily penetrate into the stainless steel shielding box through the threaded through hole in the middle of the induction plate and the gap with the insulating support, reducing the electrical resistance of the voltage dividing capacitor and matching resistor. performance, even destroying voltage divider capacitors and matching resistors
Causes the sensor to fail and cannot monitor the overvoltage of the overhead transmission line
④When the sensor is covered with ice, the weight of the sensor will increase with the increase of the amount of ice, which will easily cause the sensor to fall off from the tower. Not only will the sensor fail to work, but it will even cause power system operation accidents

Method used

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  • Overvoltage measuring sensor for overhead transmission line based on coupling electric field
  • Overvoltage measuring sensor for overhead transmission line based on coupling electric field
  • Overvoltage measuring sensor for overhead transmission line based on coupling electric field

Examples

Experimental program
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Embodiment 1

[0032] Such as Figure 1~3 As shown, a sensor for overvoltage measurement of 110kV overhead transmission lines based on coupling electric field mainly includes sensor housing 2, insulating pad 3, fixing plate 4, voltage dividing capacitor group 5, matching resistor 6, coaxial cable 7 , Inner shielding shell 8, data acquisition unit 10, etc.

[0033] The material of the sensor housing 2 is copper, and the shape of the sensor housing 2 is hemispherical with an outer flange at the bottom. The inner diameter of the hemispherical sensor housing 2 is 180mm, the thickness is 5mm, the width of the outer flange is 20mm, and the thickness is 5mm, and a screw blind with a hole depth of 5mm is set at the axis of the top thickened part in the shell. hole. The inner shielding shell 8 is installed in the sensor housing 2 . The voltage dividing capacitor group 5 and the matching resistor 6 are installed in the inner shielding shell 8; the voltage dividing capacitor group 5 and the matching...

Embodiment 2

[0040] A sensor for overvoltage measurement of overhead transmission lines based on coupled electric fields of 500kV is the same as in Embodiment 1, wherein: the material of the sensor housing 2 is stainless steel, and the inner diameter of the hemispherical sensor housing 2 is 400mm, The thickness is 7mm, the width of the outer flange is 30mm, and the thickness is 15mm, and a screw blind hole with a depth of 8mm is set at the top of the shell; 12 circular grooves are evenly arranged on the outer flange of the sensor housing 2 Bolt through holes; the shortest distance between the sensor housing 2 and the bottom end of the sag of the jumper wire of the overhead transmission line 1 is 5m; the voltage dividing capacitor group 5 is formed by parallel connection of 4 commercially available non-inductive capacitors (a capacitor bank with a capacitance value of 0.04uF); the resistance value of the matching resistor 6 is 50Ω (matched with the coaxial cable); the hollow cylinder of the ...

Embodiment 3

[0042] A sensor for overvoltage measurement of overhead transmission lines based on coupling electric field of 1000kV, same as embodiment 1, wherein: the material of the sensor housing 2 is aluminum alloy, and the inner diameter of the hemispherical sensor housing 2 is 1000mm , the thickness is 10mm, the width of the outer flange is 40mm, the thickness is 20mm, and a screw blind hole with a depth of 10mm is set at the top of the shell; The bolt through hole of the slot; the shortest distance between the bottom end of the sensor housing 2 and the sag of the jumper wire of the overhead transmission line 1 is 10m; (a capacitor bank with a capacitance value of 0.08uF); the resistance value of the matching resistor 6 is 75Ω (matched to the coaxial cable); the hollow cylinder of the inner shielding shell 8 has a height of 100mm, an inner diameter of 110mm, and a thickness of 12mm, wherein the thickness of the aluminum sheet is 4mm; the material of the insulating pad 3 is epoxy glass...

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Abstract

The invention provides an overvoltage measuring sensor for an overhead transmission line based on a coupling electric field, and relates to an overvoltage online monitoring sensor of the overhead transmission line. The overvoltage measuring sensor provided by the invention mainly comprises a sensor shell, an insulating pad, a fixing board, a partial voltage capacitor group, a matching resistor, a coaxial cable, an inner screening shell, a data collecting unit and the like. The overvoltage measuring sensor provided by the invention has the advantages of simple structure, convenience in mounting and dismounting, low cost, high accuracy of overvoltage measurement, good linearity, high accuracy, strong generality, wide application range, safe and reliable use and the like. With the adoption of the overvoltage measuring sensor provided by the invention, overvoltage online monitoring can be conveniently carried out on the overhead transmission line. The overvoltage measuring sensor provided by the invention can be widely applied to the overvoltage online monitoring of the overhead transmission line, and is particularly suitable for monitoring overvoltage of 110-1000 kV high-voltage overhead transmission lines on line.

Description

[0001] The invention belongs to the technical field of power system overvoltage measurement, and in particular relates to the structure of an overvoltage on-line monitoring sensor for overhead transmission lines. Background technique [0002] The safe production of the power system is closely related to the security of national property and the interests of people's lives. In our country, lightning damage is the most important factor affecting the safe operation of power system. Overhead transmission lines are erected in the air and exposed to the atmosphere, so they are prone to lightning overvoltages, especially high-voltage transmission lines are higher from the ground and are more susceptible to lightning damage. According to statistics, among the many causes of line faults, the number of trips caused by lightning strikes on high-voltage overhead transmission lines in my country accounts for 40% to 70% of the total number of trips. Therefore, in order to propose effective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165G01R15/06G01R1/04
Inventor 姚陈果王琪米彦李成祥吴昊龙羿陈锐
Owner CHONGQING UNIV
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