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Over-voltage monitoring sensor for AD electricity system

A technology for monitoring sensors and power systems. It is applied in the direction of measuring current/voltage, instruments, and measuring devices. It can solve the problems of inability to collect overvoltage signals of the power system, high cost of sensors, and inability to use the power grid to achieve safe and reliable operation. The effect of high measurement accuracy and fast response

Inactive Publication Date: 2007-02-07
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of the sensor is relatively high, and it cannot be used in power grids with a voltage level of 110kV and higher, nor can it collect external overvoltage signals of the power system

Method used

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  • Over-voltage monitoring sensor for AD electricity system
  • Over-voltage monitoring sensor for AD electricity system
  • Over-voltage monitoring sensor for AD electricity system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] like Figures 1 to 3 As shown, a transformer bushing end screen AC power system overvoltage monitoring sensor mainly includes: a casing 15, two copper discs 8, 9, a voltage dividing capacitor 6, a voltage dividing resistor 7, a matching resistor 2, and a protection unit 1. Coaxial cable 13, etc. The shell 15 is a stainless steel cylindrical shell, and the thickness of the shell 15 is 10mm. Two copper discs 8, 9 are respectively arranged on the two ends of the stainless steel shell 15. And be fixedly connected with shell 15 by the internal screw thread of shell 15, a through hole is respectively set at the center of two disks 8,9, a nut 11 is affixed by screw rod at the center through hole of disk 8, and in this circle The inner side of the disk 8 is fixedly connected with an insulating bracket 12 by a screw; the cable plug 14 is threaded through the central through hole of the disk 9, and the double-shielded coaxial cable 13 for transmitting voltage signals is inserte...

Embodiment 2

[0021] like Figures 1 to 2As shown, a capacitive current transformer AC power system overvoltage monitoring sensor mainly includes: a casing 15, two copper discs 8, 9, a voltage dividing capacitor 6, a voltage dividing resistor 7, a matching resistor 2, and a protection unit 1. Coaxial cable 13, etc. The shell 15 is a stainless steel cylindrical shell, and the thickness of the shell 15 is 3mm. Two copper discs 8, 9 are respectively arranged on the two ends of the stainless steel shell 15. And be fixedly connected with shell 15 by the internal screw thread of shell 15, a through hole is respectively set at the center of two disks 8,9, a nut 11 is affixed by screw rod at the center through hole of disk 8, and in this circle The inner side of the disk 8 is fixedly connected with an insulating bracket 12 by a screw; the cable plug 14 is threaded through the central through hole of the disk 9, and the double-shielded coaxial cable 13 for transmitting voltage signals is inserted ...

Embodiment 3

[0023] like Figures 1 to 2 As shown, a capacitive voltage transformer AC power system overvoltage monitoring sensor mainly includes: a casing 15, two copper discs 8, 9, a voltage dividing capacitor 6, a voltage dividing resistor 7, a matching resistor 2, and a protection unit 1. Coaxial cable 13, etc. The shell 15 is a tempered glass cylindrical shell, and the thickness of the shell 15 is 5mm. Two copper discs 8, 9 are respectively arranged on the two ends of the stainless steel shell 15. And be fixedly connected with shell 15 by the internal screw thread of shell 15, a through hole is respectively set at the center of two disks 8,9, a nut 11 is affixed by screw rod at the center through hole of disk 8, and in this circle The inner side of the disk 8 is fixedly connected with an insulating bracket 12 by a screw; the cable plug 14 is threaded through the central through hole of the disk 9, and the double-shielded coaxial cable 13 for transmitting voltage signals is inserted ...

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Abstract

The over-voltage monitor sensor for 110KV-50KV ac power system comprises: a shell, a disk, a voltage-division capacitor / resistance, a matching resistance, a protective unit, and the co-axial cable. This invention can bear large impact voltage, can respond the signal fast, and has wide application for high precision and stability.

Description

technical field [0001] The invention belongs to a power system overvoltage signal acquisition device, in particular to an overvoltage signal acquisition device for a 110-500kV AC power system. Background technique [0002] The impact of overvoltage on the safety of power grid operation has attracted more and more attention. Operation experience shows that most of the various accidents in the power grid are caused by overvoltage in the system, so it is particularly important to monitor the overvoltage signal of the power system. Although a large number of high-voltage dividers are installed as measuring elements in the actual operating system to monitor the voltage waveform, the overvoltage is often steep and short in duration, and the existing measuring devices cannot accurately capture the power due to their own technical limitations. The occurrence process of overvoltage in the system makes it very difficult to accurately analyze and judge the cause of overvoltage. [00...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R19/165
Inventor 司马文霞杜林刘凡杨庆米彦李剑王有元杨丽君胡建林
Owner CHONGQING UNIV
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