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Lightning arrester resistive current online monitoring system and method

A resistive current and monitoring system technology, applied in the direction of measuring current/voltage, instrument, measuring electricity, etc., can solve problems such as phase difference, easy to cause overheating hidden danger, unfavorable installation, etc.

Inactive Publication Date: 2021-02-12
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is easier to directly extract the current signal through the grounding wire at the lower end of the arrester. At present, one method of extracting the operating voltage signal at both ends of the arrester is to extract it at the secondary side of the PT. This signal extraction method has the following disadvantages: because the arrester is located in the substation Distributed layout in the station, the existence of various capacitive or inductive devices in the station makes the power frequency voltage of different monitoring points not completely synchronized, but there is a certain phase difference, so the power frequency signal measured by the secondary side of the PT cannot accurately reflect the voltage at both ends of the arrester. Voltage
Another extraction method is to connect high-precision voltage sensors, such as capacitive sensors, in parallel at both ends of the arrester. Voltage sensors run in parallel for a long time in a high-voltage environment, which is prone to overheating hazards

Method used

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  • Lightning arrester resistive current online monitoring system and method
  • Lightning arrester resistive current online monitoring system and method
  • Lightning arrester resistive current online monitoring system and method

Examples

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Embodiment 1

[0065] An embodiment of the present invention provides an online monitoring system for arrester resistive current, such as figure 1 As shown, it includes voltage acquisition terminal, current acquisition terminal, edge computing node, monitoring system background and remote client.

[0066] specific,

[0067] The voltage acquisition terminal 3 is installed on the high-voltage wire or the bus bar 1 next to the arrester 2 nearby, and is used for monitoring the operating voltage at both ends of the arrester. see figure 2 , the voltage acquisition terminal 3 includes a voltage sensor based on the coupling capacitor voltage division method, a conditioning circuit, an acquisition unit, a wireless communication module, and a power supply module. Except for the voltage sensor, all other modules are built in the metal cavity and are connected to the wires at the same potential .

[0068] The voltage sensor is used for coupling to obtain the operating voltage at both ends of the arr...

Embodiment 2

[0106] An embodiment of the present invention provides an online monitoring method for the resistive current of an arrester, see Figure 4 ,include:

[0107] Step S210, the background of the monitoring system issues a collection command to each edge computing node, and sets the collection time point or collection method;

[0108] Step S220, after the edge computing node receives the collection command sent by the background of the monitoring system, it further sends it to the voltage and current collection terminal on the relevant lightning arrester. The voltage and current acquisition terminals start the synchronous acquisition function, and upload the respective collected voltage or current data to the corresponding edge computing nodes;

[0109] Step S230, the edge computing node analyzes the synchronously collected voltage and current, calculates the initial phase of the voltage and current fundamental components, and then obtains the phase difference, and combines the cu...

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Abstract

The invention provides a lightning arrester resistive current online monitoring system and method. The system comprises a voltage acquisition terminal, a current acquisition terminal, an edge computing node, a monitoring system background and a remote client. The voltage acquisition terminal is designed to be installed on a high-voltage wire or a bus beside a lightning arrester to monitor an operating voltage at the two ends of the lightning arrester; the current acquisition terminal is designed to be installed on a lightning arrester grounding down lead to monitor the total current of the lightning arrester during operation; and the resistive current of the lightning arrester is calculated by the edge calculation node according to the collected voltage and current waveforms; A real-time,efficient, stable and reliable monitoring mode is provided for online monitoring of the resistive current of the lightning arrester of a transformer substation, the defects of the lightning arrester can be found in time, power equipment damage caused by failure of the lightning arrester is prevented, and the system and the method are crucial to safe operation of a power grid.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of power grids, in particular to an on-line monitoring system and method for a resistive current of an arrester. Background technique [0002] Metal oxide surge arresters (MOA) are mainly composed of zinc oxide valve plates connected in series, and have very good nonlinear volt-ampere characteristics. MOA has a large resistivity under power frequency voltage, which can quickly and effectively suppress power frequency current; under lightning overvoltage, the resistivity will become very small, which can discharge lightning current very well, and is widely used in overvoltage protection of power systems . However, with the increase of the operation time of the arrester and the defects of its products, the problems of moisture and aging of the arrester under the operating voltage have become increasingly prominent. For lightning arresters, due to the rapid development of their faults, t...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R19/00
CPCG01R19/00G01R31/00
Inventor 路永玲胡成博黄强张国江张军徐江涛王真秦剑华陶风波贾骏刘子全朱雪琼
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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