CN115656738A - Online switch cabinet partial discharge monitoring system and method - Google Patents
Online switch cabinet partial discharge monitoring system and method Download PDFInfo
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- CN115656738A CN115656738A CN202211274659.7A CN202211274659A CN115656738A CN 115656738 A CN115656738 A CN 115656738A CN 202211274659 A CN202211274659 A CN 202211274659A CN 115656738 A CN115656738 A CN 115656738A
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Abstract
The invention discloses an on-line switch cabinet partial discharge monitoring system and a method, wherein a transient voltage-to-ground voltage acquisition module is used for acquiring partial discharge signals of a switch cabinet to be detected in real time and transmitting the acquired partial discharge signals to a data processing module; the ultrasonic sampling module is used for acquiring signal characteristic data of the switch cabinet to be detected in real time and transmitting the detected signal characteristic data to the data processing module; comparing the partial discharge signal and the signal characteristic data of the switch cabinet to be detected with a preset threshold value by using a data processing module, and if the partial discharge signal and the signal characteristic data are higher than the respective set threshold values, performing early warning; if one item is higher than the set threshold value, continuing to warn the abnormality; if both the two items are lower than respective set thresholds, early warning is not carried out, and the transient voltage-to-ground voltage and the signal characteristic data of the switch cabinet to be tested are combined, so that accurate monitoring of partial discharge of the switch cabinet can be realized, and misjudgment caused by external interference is avoided.
Description
Technical Field
The invention belongs to the field of switch cabinet monitoring devices, and particularly relates to an on-line switch cabinet partial discharge monitoring system and method.
Background
The switch cabinet plays a vital role in a power distribution network of a power system, the stable and reliable operation of the switch cabinet has important significance for guaranteeing the power supply reliability of the power system, however, due to the influences of the structural characteristics and the complex operation environment of the switch cabinet, partial discharge can be excited due to factors such as aging of insulating materials or occurrence of insulation defects and the like in the long-term operation process of the switch cabinet, and finally insulation breakdown or flashover of equipment can be developed. Due to various objective reasons, cable lap joint faults, bus faults, contact faults, operating mechanism faults, lightning arrester faults and the like occur in the process of the switch cabinet after installation and commissioning, so that hidden dangers are brought to the reliable operation of a power grid, and the safe and stable operation of equipment is directly influenced. The insulation defect is one of main causes of the fault of the switch cabinet, and the partial discharge is a main embodiment of the insulation defect and is also a main cause of further deterioration of the insulation defect. Along with the more and more emergence of accident, receive more and more attention to partial discharge's detection and monitoring, once the cubical switchboard takes place the partial discharge trouble, all probably arouse the safe and reliable operation of auxiliary assembly such as main transformer, will arouse the power failure of local even whole electric wire netting certainly, cause huge economic loss.
At present, most methods for detecting partial discharge of a switch cabinet are handheld and regularly patrolling, however, the existing methods cannot realize calibration of discharge amount and cannot perform quantitative analysis on discharge signals in the actual use process of years. Although the existing partial discharge detection method of the switch cabinet carries out partial discharge detection work of a large number of switch cabinets, the detected discharge defect is limited. Equipment faults caused by insulation defects of the switch cabinet occur occasionally, a new switch cabinet partial discharge detection method is needed, and the detection capability of internal defects of the on-site switch cabinet is improved.
Disclosure of Invention
The invention aims to provide an online switch cabinet partial discharge monitoring system and method, which are used for solving the problems of uncertain routing inspection period, influence of human factors and low detection precision depending on the conventional method in the conventional manual periodic routing inspection.
An online switch cabinet partial discharge monitoring system comprises a transient voltage-to-ground voltage acquisition module, an ultrasonic sampling module and a data processing module;
the transient voltage-to-ground voltage acquisition module is used for acquiring partial discharge signals of the switch cabinet to be detected in real time and transmitting the acquired partial discharge signals to the data processing module;
the ultrasonic sampling module is used for acquiring signal characteristic data of the switch cabinet to be detected in real time and transmitting the detected signal characteristic data to the data processing module;
the data processing module compares the partial discharge signal and the signal characteristic data of the switch cabinet to be detected with a preset threshold value according to the acquired partial discharge signal and the acquired signal characteristic data, and performs early warning if the partial discharge signal and the signal characteristic data are higher than the respective set threshold values; if one item is higher than the set threshold value, continuing to warn abnormally; and if the two items are lower than the respective set threshold values, no early warning is carried out.
Preferably, a plurality of transient voltage-to-ground voltage acquisition modules are respectively placed at different positions on the surface of the switch cabinet, so as to judge the position of a discharge source; the transient voltage-to-ground voltage acquisition module with the maximum detected partial discharge signal is closest to the position of the partial discharge power supply point; the position of the partial discharge point can be accurately positioned through the position of the transient voltage-to-ground voltage acquisition module.
Preferably, the transient voltage to ground voltage acquisition module specifically employs a coupling capacitance sensor.
Preferably, the ultrasonic sampling module adopts an ultrasonic sensor.
An on-line switch cabinet partial discharge monitoring method comprises the following steps:
s1, collecting partial discharge signals of a switch cabinet to be tested and signal characteristic data of the switch cabinet to be tested in real time;
s2, comparing the partial discharge signal and the signal characteristic data of the switch cabinet to be detected with a preset threshold value according to the obtained partial discharge signal and the signal characteristic data, and if the partial discharge signal and the signal characteristic data are both higher than the respective set threshold values, performing early warning; if one item is higher than the set threshold value, continuing to warn the abnormality; and if the two items are lower than the respective set threshold values, analyzing and early warning are carried out according to the two specific numerical values.
Preferably, for the signal characteristic data acquired by the ultrasonic sampling module, if the signal characteristic data is noise, the signal characteristic data is a normal signal; if not, judging whether the signal characteristic data value is larger than a set threshold value; if the signal characteristic data value is less than or equal to the set threshold value, the signal characteristic data value is normal; and if the signal characteristic data value is larger than the set threshold value, determining that the signal characteristic data value is abnormal.
Preferably, the set threshold of the signal characteristic data is 8.
Preferably, if the signal characteristic data value is greater than 8 and less than or equal to 30, an abnormal result is obtained;
for an abnormal result, if the signal characteristic data value is greater than 20 and less than or equal to 30, performing abnormal early warning without increasing the danger level of the abnormal warning; if the signal characteristic data value is greater than the set value 8 and less than or equal to 20, longitudinally analyzing the signal characteristic data values in the adjacent time periods acquired by the signal characteristic data value to acquire the relative deviation of the signal characteristic data values in the time period, if the relative deviation of the acquired signal characteristic data values is greater than fifty percent, indicating that the partial discharge signal is in an unstable state, and increasing the danger level of abnormal warning, otherwise, not increasing the danger level of the abnormal warning;
if the signal characteristic data value is larger than 30, the partial discharge signal is in an unstable state, and the danger level of the abnormal warning is improved.
Preferably, the preset threshold value of the partial discharge signal is 20dB/mV.
Preferably, when the transient voltage-to-ground voltage acquisition module acquires the partial discharge signal value of the switch cabinet to be tested, the value of the acquired partial discharge signal value of the switch cabinet to be tested is subjected to constant value analysis;
if the partial discharge signal value of the switch cabinet to be tested is greater than 55dB/mV, indicating that partial discharge occurs in the switch cabinet, and performing early warning; if the partial discharge signal value of the switch cabinet to be tested is greater than 40dB/mV and less than or equal to 55dB/mV, performing abnormal warning; and if the partial discharge signal value of the switch cabinet to be tested is more than or equal to 20dB/mV and less than or equal to 40dB/mV, longitudinally analyzing the collected partial discharge signal value of the switch cabinet to be tested, if the relative deviation of the partial discharge signal values at the current adjacent moment is more than fifty percent, early warning is carried out, and otherwise, abnormal early warning is carried out.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to an on-line switch cabinet partial discharge monitoring system, which is characterized in that a transient voltage-to-ground voltage acquisition module is used for acquiring partial discharge signals of a switch cabinet to be detected in real time and transmitting the acquired partial discharge signals to a data processing module; the ultrasonic sampling module is used for acquiring signal characteristic data of the switch cabinet to be detected in real time and transmitting the detected signal characteristic data to the data processing module; comparing the partial discharge signal and the signal characteristic data of the switch cabinet to be detected with a preset threshold value by using a data processing module, and if the partial discharge signal and the signal characteristic data are higher than the respective set threshold values, performing early warning; if one item is higher than the set threshold value, continuing to warn the abnormality; if both the two items are lower than respective set thresholds, early warning is not carried out, and the transient voltage-to-ground voltage and the signal characteristic data of the switch cabinet to be tested are combined, so that accurate monitoring of partial discharge of the switch cabinet can be realized, and misjudgment caused by external interference is avoided.
The invention discloses an on-line switch cabinet partial discharge monitoring method, which comprises the steps of comparing a partial discharge signal and signal characteristic data of a switch cabinet to be detected with a preset threshold value according to the acquisition, and carrying out early warning if the partial discharge signal and the signal characteristic data are both higher than the respective set threshold value; if one item is higher than the set threshold value, continuing to warn the abnormality; if the two items are lower than the respective set threshold values, analysis and early warning are carried out according to the two specific numerical values, and complementation of the two data can be realized so as to improve the accuracy of data monitoring.
The signal characteristic data acquired by the ultrasonic sampling module is subjected to longitudinal analysis of specific data values, and the risk in the early stage of partial discharge can be judged in time so as to improve the detection accuracy.
Drawings
Fig. 1 is a schematic diagram of a system structure according to an embodiment of the present invention.
Fig. 2 is a flowchart of ultrasonic sampling data analysis in embodiment 1 of the present invention.
Fig. 3 is a flow chart of data analysis of transient voltage to ground voltage acquisition in embodiment 2 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an online switch cabinet partial discharge monitoring system includes a transient voltage-to-ground voltage acquisition module, an ultrasonic sampling module, and a data processing module;
the transient voltage-to-ground voltage acquisition module is used for acquiring partial discharge signals of the switch cabinet to be detected in real time and transmitting the acquired partial discharge signals to the data processing module;
the ultrasonic sampling module is used for acquiring signal characteristic data of the switch cabinet to be detected in real time and transmitting the detected signal characteristic data to the data processing module;
the data processing module compares the partial discharge signal and the signal characteristic data of the switch cabinet to be detected with a preset threshold value according to the acquired partial discharge signal and the acquired signal characteristic data, and performs early warning if the partial discharge signal and the signal characteristic data are higher than the respective set threshold values; if one item is higher than the set threshold value, continuing to warn the abnormality; and if the two items are lower than the respective set threshold values, analyzing and early warning are carried out according to the two specific numerical values.
Transient state to ground voltage acquisition module and ultrasonic sampling module all install according to setting for the check point of waiting to detect the cubical switchboard, adopt the fixed mounting mode installation, ensure the stability of installation. The installation frame can be adopted as the installation medium of the transient voltage-to-ground acquisition module and the ultrasonic sampling module, and the installation is fixed by bolts or screws.
For the switch cabinet to be detected with abnormal warning detection results, mobile monitoring equipment consisting of a transient voltage-to-ground voltage acquisition module and an ultrasonic sampling module can be adopted for rechecking; a plurality of transient voltage-to-ground voltage acquisition modules and ultrasonic sampling modules are respectively placed at different positions on the surface of a switch cabinet, so that the position of a discharge source is judged; the transient voltage-to-ground voltage acquisition module with the maximum detected partial discharge signal is closest to the position of the partial discharge power supply point; the position of the partial discharge point can be accurately positioned through the position of the transient voltage-to-ground voltage acquisition module.
The transient voltage to ground voltage acquisition module specifically adopts a coupling capacitance sensor. The ultrasonic sampling module adopts an ultrasonic sensor.
The transient voltage-to-ground voltage acquisition module and the ultrasonic sampling module are in wireless signal transmission with the data processing module. Transient state to ground voltage acquisition module and the transmission of the data of ultrasonic sampling module collection, communication power transmission and transformation equipment is based on the data of above-mentioned collection, and through power transmission and transformation equipment through the wireless network deployment agreement access of thing networking be used for installing the power transmission and transformation node equipment of data processing module, can be with the transmission of the data of gathering behind application platform.
For the signal characteristic data acquired by the ultrasonic sampling module, if the signal characteristic data is noise, namely the signal characteristic data does not belong to the ultrasonic test value range of the switch cabinet, the signal characteristic data is a normal signal; if not, judging whether the signal characteristic data value is larger than a set threshold value; if the signal characteristic data value is less than or equal to the set threshold value, the signal characteristic data value is normal; and if the signal characteristic data value is larger than the set threshold value, determining that the signal characteristic data value is abnormal. The set threshold of the signal characteristic data is 8.
An on-line switch cabinet partial discharge monitoring method comprises the following steps:
s1, collecting partial discharge signals of a switch cabinet to be tested and signal characteristic data of the switch cabinet to be tested in real time;
s2, comparing the partial discharge signal and the signal characteristic data of the switch cabinet to be detected with a preset threshold value according to the obtained partial discharge signal and the signal characteristic data, and if the partial discharge signal and the signal characteristic data are both higher than the respective set threshold values, performing early warning; if one item is higher than the set threshold value, continuing to warn the abnormality; and if the two items are lower than the respective set threshold values, analyzing and early warning are carried out according to the two specific numerical values.
Example 1
As shown in fig. 2, to realize more accurate warning, the signal characteristic data values are subdivided. If the signal characteristic data value q is larger than a set threshold value and is smaller than or equal to 30, an abnormal result is obtained;
for an abnormal result, if the signal characteristic data value is greater than 20 and less than or equal to 30, performing abnormal early warning without increasing the danger level of the abnormal warning; if the signal characteristic data value is larger than the set threshold value and is less than or equal to 20, longitudinally analyzing the signal characteristic data value in the adjacent time period acquired by the signal characteristic data value to acquire the relative deviation of the signal characteristic data value in the time period, if the relative deviation of the acquired signal characteristic data value is larger than fifty percent, indicating that the partial discharge signal is in an unstable state, and increasing the danger level of abnormal warning, otherwise, not increasing the danger level of the abnormal warning;
if the signal characteristic data value is larger than 30, the partial discharge signal is in an unstable state, and the danger level of the abnormal warning is improved.
In fig. 2, Δ q% represents the relative deviation of the signal characteristic data values as follows:
q ti signal characteristic data values, q, for ti detection ti+1 The signal characteristic data value detected for ti + 1.
Example 2
As shown in fig. 3, the measurement bandwidth of the coupling capacitance sensor adopted by the transient voltage to ground acquisition module is 3MHz to 60MHz, and the unit is dB/mV; when the measured partial discharge signal amplitude in the switch cabinet is greater than or equal to 20dB/mV, the probability of occurrence of destructive faults is high, and when the partial discharge signal amplitude is smaller than 20dB/mV, and some partial discharge signals belong to initial discharge, overlarge discharge can be formed gradually, so that early warning needs to be performed, and the partial discharge signal amplitude is specifically analyzed.
Specifically, the preset threshold value of the partial discharge signal is 20dB/mV, when the transient voltage-to-ground voltage acquisition module acquires that the partial discharge signal value of the switch cabinet to be tested is less than 20dB/mV, the acquired partial discharge signal value of the switch cabinet to be tested is subjected to transverse analysis, the offset of the partial discharge signal value at the current adjacent moment is calculated, and if the offset of the partial discharge signal value at the current adjacent moment is less than one hundred percent, the current switch cabinet is normal and no early warning is performed; if the offset of the partial discharge signal value at the current adjacent moment is more than one hundred percent and less than two hundred percent, indicating that the switch cabinet has partial discharge, and performing abnormal warning; and if the offset of the partial discharge signal value at the current adjacent moment is more than two hundred percent, indicating that the switch cabinet is subjected to partial discharge, and performing early warning.
When the transient voltage-to-ground voltage acquisition module acquires the partial discharge signal value A of the switch cabinet to be tested, which is greater than or equal to 20dB/mV, carrying out fixed value analysis on the acquired partial discharge signal value of the switch cabinet to be tested;
if the partial discharge signal value A of the switch cabinet to be tested is larger than 55dB/mV, the fact that partial discharge occurs in the switch cabinet is indicated, and early warning is carried out; if the partial discharge signal value A of the switch cabinet to be tested is greater than 40dB/mV and less than or equal to 55dB/mV, performing abnormal warning; if the partial discharge signal value A of the switch cabinet to be tested is greater than or equal to 20dB/mV and less than or equal to 40dB/mV, longitudinally analyzing the collected partial discharge signal value of the switch cabinet to be tested, if the relative deviation of the partial discharge signal values at the current adjacent moment is greater than fifty percent, indicating that the switch cabinet is subjected to partial discharge, and performing early warning, otherwise performing abnormal early warning. The invention carries out fixed value judgment and longitudinal analysis on the detection of the partial discharge signal, thereby improving the detection precision and facilitating the timely overhaul of the working personnel.
Wherein, the offset of partial discharge signal value at the current adjacent moment
Relative deviation of partial discharge signal values at adjacent times
A ti Partial discharge signal value, A, for ti detection ti+1 The partial discharge signal value detected for ti + 1.
Transient voltage to ground is detected, when partial discharge occurs, a discharge point generates high-frequency current waves which are transmitted to two directions and are influenced by a skin effect, and the current waves are only concentrated on the inner surface of the metal cabinet body and are transmitted without directly penetrating. At the metal disconnection or insulation connection, the current wave is transferred to the outer surface and enters the free space in the form of electromagnetic wave; the rising edge of the electromagnetic wave touches the outer surface of the metal to generate transient voltage to earth
In summary, the fault detection is performed on the switch cabinet through the transient voltage-to-ground voltage acquisition module and the ultrasonic sampling module, the equipment which is connected to the data processing module through wireless communication is used for calculation and analysis, and the data can be visually presented through the data processing module, so that the partial discharge monitoring and early warning, the real-time data recording and the comprehensive analysis of the operation condition of the switch cabinet are realized, the safe operation of the power equipment is ensured, and the accurate maintenance of the equipment is realized.
The above technical solutions are merely descriptions of embodiments of the present invention, and it is understood that modifications and substitutions of these embodiments can be made by those of ordinary skill in the art without departing from the principle and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims (10)
1. An online switch cabinet partial discharge monitoring system is characterized by comprising a transient voltage-to-ground voltage acquisition module, an ultrasonic sampling module and a data processing module;
the transient voltage-to-ground voltage acquisition module is used for acquiring partial discharge signals of the switch cabinet to be detected in real time and transmitting the acquired partial discharge signals to the data processing module;
the ultrasonic sampling module is used for acquiring signal characteristic data of the switch cabinet to be detected in real time and transmitting the detected signal characteristic data to the data processing module;
the data processing module compares the partial discharge signal and the signal characteristic data of the switch cabinet to be detected with a preset threshold value according to the acquired partial discharge signal and the acquired signal characteristic data, and performs early warning if the partial discharge signal and the signal characteristic data are higher than the respective set threshold values; if one item is higher than the set threshold value, continuing to warn abnormally; and if the two items are lower than respective set thresholds, not carrying out early warning.
2. The on-line switch cabinet partial discharge monitoring system according to claim 1, wherein a plurality of transient voltage-to-ground voltage acquisition modules are respectively placed at different positions on the surface of the switch cabinet to further determine the position of a discharge source; the transient voltage-to-ground voltage acquisition module with the maximum detected partial discharge signal is closest to the position of the partial discharge power supply point; the position of the partial discharge point can be accurately positioned through the position of the transient voltage-to-ground voltage acquisition module.
3. The on-line switch cabinet partial discharge monitoring system according to claim 1, wherein the transient voltage to ground voltage acquisition module specifically employs a coupling capacitance sensor.
4. The system according to claim 1, wherein the ultrasonic sampling module employs an ultrasonic sensor.
5. An on-line switch cabinet partial discharge monitoring method is characterized by comprising the following steps:
s1, collecting partial discharge signals of a switch cabinet to be tested and signal characteristic data of the switch cabinet to be tested in real time;
s2, comparing the partial discharge signal and the signal characteristic data of the switch cabinet to be detected with a preset threshold value according to the obtained partial discharge signal and the signal characteristic data, and if the partial discharge signal and the signal characteristic data are both higher than the respective set threshold values, performing early warning; if one item is higher than the set threshold value, continuing to warn the abnormality; and if the two items are lower than the respective set threshold values, analyzing and early warning are carried out according to the two specific numerical values.
6. The on-line switch cabinet partial discharge monitoring method according to claim 5, wherein for the signal characteristic data obtained by the ultrasonic sampling module, if the signal characteristic data is noise, the signal characteristic data is a normal signal; if not, judging whether the signal characteristic data value is larger than a set threshold value; if the signal characteristic data value is less than or equal to the set threshold value, the signal characteristic data value is normal; and if the signal characteristic data value is larger than the set threshold value, determining that the signal characteristic data value is abnormal.
7. The on-line switch cabinet partial discharge monitoring method according to claim 5, wherein the set threshold of the signal characteristic data is 8.
8. The on-line switch cabinet partial discharge monitoring method according to claim 7, wherein if the signal characteristic data value is greater than 8 and less than or equal to 30, an abnormal result is obtained;
for an abnormal result, if the signal characteristic data value is greater than 20 and less than or equal to 30, performing abnormal early warning without increasing the danger level of the abnormal warning; if the signal characteristic data value is greater than the set value 8 and less than or equal to 20, longitudinally analyzing the signal characteristic data values in the adjacent time periods acquired by the signal characteristic data value to acquire the relative deviation of the signal characteristic data values in the time period, if the relative deviation of the acquired signal characteristic data values is greater than fifty percent, indicating that the partial discharge signal is in an unstable state, and increasing the danger level of abnormal warning, otherwise, not increasing the danger level of the abnormal warning;
if the signal characteristic data value is larger than 30, the partial discharge signal is in an unstable state, and the danger level of the abnormal warning is improved.
9. The method for monitoring the partial discharge of the on-line switch cabinet according to claim 5, wherein the preset threshold of the partial discharge signal is 20dB/mV.
10. The on-line switch cabinet partial discharge monitoring method according to claim 9, wherein when the transient voltage-to-ground voltage acquisition module acquires a partial discharge signal value of the switch cabinet to be tested, which is greater than or equal to 20dB/mV, the acquired partial discharge signal value of the switch cabinet to be tested is subjected to constant value analysis;
if the partial discharge signal value of the switch cabinet to be tested is larger than 55dB/mV, indicating that partial discharge occurs in the switch cabinet, and performing early warning; if the partial discharge signal value of the switch cabinet to be tested is greater than 40dB/mV and less than or equal to 55dB/mV, performing abnormal warning; and if the partial discharge signal value of the switch cabinet to be tested is more than or equal to 20dB/mV and less than or equal to 40dB/mV, longitudinally analyzing the collected partial discharge signal value of the switch cabinet to be tested, if the relative deviation of the partial discharge signal values at the current adjacent moment is more than fifty percent, early warning is carried out, and otherwise, abnormal early warning is carried out.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117783797A (en) * | 2024-02-28 | 2024-03-29 | 国网山东省电力公司莒县供电公司 | Power distribution automatic switch partial discharge detection early warning system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117783797A (en) * | 2024-02-28 | 2024-03-29 | 国网山东省电力公司莒县供电公司 | Power distribution automatic switch partial discharge detection early warning system |
| CN117783797B (en) * | 2024-02-28 | 2024-05-10 | 国网山东省电力公司莒县供电公司 | Power distribution automatic switch partial discharge detection early warning system |
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