Transformer substation overvoltage intelligence monitoring system and method

A technology of intelligent monitoring and overvoltage, applied in the field of power engineering, which can solve problems such as analysis

Inactive Publication Date: 2015-02-04
STATE GRID CORP OF CHINA +2
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  • Abstract
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Problems solved by technology

The above inventions proposed some methods for obtaining overvoltage waveforms, but failed to further analyze the obtained waveforms

Method used

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  • Transformer substation overvoltage intelligence monitoring system and method
  • Transformer substation overvoltage intelligence monitoring system and method
  • Transformer substation overvoltage intelligence monitoring system and method

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Embodiment 1

[0090] see Figure 1-4 , a substation overvoltage intelligent monitoring method, is characterized in that, comprises the following steps:

[0091] Step 1: collect overvoltage signal;

[0092] Use the overvoltage sensor to detect whether there is overvoltage, and take the zero sequence signal component U 0 (n) The moment exceeding 0.1 is the moment of overvoltage occurrence; intercept the time period t before the moment of overvoltage occurrence f = 20ms, time period t after the moment of overvoltage occurrence t = 40ms is the overvoltage calculation time period, a total of 60ms; use a frequency of 200kHz to obtain the U of the overvoltage time period 0 (n);

[0093] Step 2: Extract U 0 (n) time-domain features, frequency-domain features and time-frequency features;

[0094] Step 3: Carry out fault classification on the overvoltage signal.

[0095] In step 2,

[0096] The time domain features are:

[0097] ① Effective value U orms

[0098] U ...

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Abstract

The invention discloses a transformer substation overvoltage intelligence monitoring system and a transformer substation overvoltage intelligence monitoring method. The transformer substation overvoltage intelligence monitoring method includes following steps: step 1, collecting overvoltage signals, using an overvoltage sensor to detect whether overvoltage occurs, and using the moment when a zero sequence signal component U0(n) exceeds 0.1 as an overvoltage occurrence moment; intercepting a time period tf of 20ms before the overvoltage occurrence moment and a time period tt of 40ms after the overvoltage occurrence moment, using the sum of the time period tf and the time period tt, equal to 60ms, as an overvoltage calculation time period, and using frequency of 200kHz to obtain the zero sequence signal component U0(n) in the overvoltage time period; step 2, extracting time domain features, frequency domain features and time frequency features of the zero sequence signal component U0(n); step 3, performing fault classification on the overvoltage signals. The transformer substation overvoltage intelligence monitoring system and the transformer substation overvoltage intelligence monitoring method are easy to implement, and can automatically perform the fault classification and early warning.

Description

technical field [0001] The invention belongs to the technical field of electric power engineering, and relates to a substation overvoltage intelligent monitoring system and method, which are suitable for real-time monitoring, intelligent classification and fault early warning of external overvoltage and internal overvoltage signals of 110kV substations. Background technique [0002] The 110kV substation is a hub station that supplies power to users, and the safe operation of the 110kV substation is an important prerequisite for ensuring reliable and continuous power supply. There are many reasons for the failure of 110kV substation equipment. Various external and internal overvoltages in the power system are one of the main reasons for the insulation damage of power transmission and transformation equipment, which seriously threatens the safe, reliable and stable operation of the power system. When an overvoltage fault occurs, it is necessary to monitor the overvoltage in re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R19/165
Inventor 李欣刘赟何智强万勋段建家秦家远
Owner STATE GRID CORP OF CHINA
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