CN117269694B - Partial discharge fault monitoring system - Google Patents
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- CN117269694B CN117269694B CN202311381081.XA CN202311381081A CN117269694B CN 117269694 B CN117269694 B CN 117269694B CN 202311381081 A CN202311381081 A CN 202311381081A CN 117269694 B CN117269694 B CN 117269694B
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- 238000004458 analytical method Methods 0.000 claims abstract description 40
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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Abstract
The invention discloses a partial discharge fault monitoring system, which relates to the field of partial discharge monitoring and solves the problem of low intelligent degree of partial discharge fault monitoring, and comprises a regional division module, a data acquisition module, a parameter analysis module, an intensity analysis module, a loss monitoring module and a comprehensive early warning module, wherein the regional division module is used for dividing a partial discharge monitoring region, the data acquisition module is used for acquiring regional distribution data of the partial discharge monitoring region, the parameter analysis module is used for judging the monitoring intensity level of the partial discharge monitoring region, the data acquisition module is also used for acquiring real-time partial discharge data of the partial discharge monitoring region, the intensity analysis module is used for analyzing and obtaining the partial discharge intensity of the partial discharge monitoring region, the loss monitoring module is used for monitoring the degradation condition of insulating materials in electric equipment, and the comprehensive early warning module is used for carrying out early warning on the partial discharge fault and generating early warning signals.
Description
Technical Field
The invention belongs to the field of partial discharge monitoring, relates to an ultrahigh frequency signal technology, and particularly relates to a partial discharge fault monitoring system.
Background
The partial discharge phenomenon mainly refers to high-voltage electrical equipment. According to power grid statistics, partial discharge is an important reason for the final occurrence of insulation breakdown of high-voltage electric equipment and is also an important representation of insulation degradation.
Under the current technical background, the electric power equipment insulates the discharge which occurs in a local range under the action of a strong enough electric field, the discharge is limited by only causing insulation local short circuit among conductors and not forming a conductive channel, each partial discharge has some influence on an insulation medium, the slight partial discharge has little influence on the electric power equipment insulation, the decrease of the insulation strength is slower, the strong partial discharge can cause the insulation strength to decrease quickly, the insulation material is exposed in the high-strength partial discharge environment for a long time, the loss rate of the insulation material is accelerated, even serious equipment faults of breakdown of an insulation layer occur, and the current problem is how to realize high-efficiency and accurate partial discharge fault monitoring;
to this end, we propose a partial discharge fault monitoring system.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a partial discharge fault monitoring system.
The technical problems to be solved by the invention are as follows:
the intelligent degree of the partial discharge fault monitoring process is insufficient.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the system comprises a region dividing module, a data acquisition module, a parameter analysis module, an intensity analysis module, a loss monitoring module, a comprehensive early warning module, a monitoring terminal and a server;
the regional division module is used for dividing the partial discharge monitoring region and synchronizing the regional distribution data to the data acquisition module, the data acquisition module is used for acquiring regional distribution data of the partial discharge monitoring region and transmitting the regional distribution data to the parameter analysis module through the server, the parameter analysis module is used for judging the monitoring intensity of the partial discharge monitoring region, the monitoring intensity level of the partial discharge monitoring region is obtained and transmitted to the server, and the server configures the working bandwidth of the partial discharge monitoring region according to the monitoring intensity level;
in the actual use process after configuration, the data acquisition module is also used for acquiring real-time partial discharge data of the partial discharge monitoring area and sending the real-time partial discharge data to the intensity analysis module through the server, the intensity analysis module is used for analyzing partial discharge conditions of the partial discharge monitoring area in each power frequency period time period, the obtained partial discharge intensity level of the partial discharge monitoring area is sent to the comprehensive early warning module through the server, the loss monitoring module is used for monitoring degradation conditions of insulating materials in electric equipment, the insulation degradation conditions of the electric equipment are sent to the comprehensive early warning module through the server, the comprehensive early warning module is used for early warning of partial discharge faults, early warning signals are generated and sent to the monitoring terminal through the server, and the monitoring terminal displays the early warning signals.
Further, the regional distribution data comprises the distribution line number of the partial discharge monitoring region, and the line working voltage and the line working current of each distribution line;
the real-time partial discharge data comprises real-time discharge amplitude, real-time discharge quantity, periodic discharge times and discharge interval duration of the partial discharge monitoring area.
Further, the area dividing module monitors an ultrahigh frequency signal generated when partial discharge occurs through an ultrahigh frequency omnidirectional sensor, and the monitoring range of the ultrahigh frequency omnidirectional sensor is a circular area with the radius of 10 m.
Further, the determination process of the parameter analysis module is specifically as follows:
the method comprises the steps of reading the number of distribution lines, line working voltage WVi and line working current WIi of a partial discharge monitoring area, wherein i is the number of the distribution lines, i is a non-zero natural number, the upper limit value of i is n, and the value of n is equal to the value of the number of the distribution lines;
the monitoring area S of the ultra-high frequency omnidirectional sensor is calculated according to the formula, wherein the formula is specifically as follows:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein r is the radius of the monitoring area, and the value of r is 10m;
in the embodiment, the same type of ultrahigh frequency omni-directional sensor is adopted, and the numerical value of the area of the local discharge monitoring area is equal to the area S of the monitoring area of the ultrahigh frequency omni-directional sensor;
dividing the distribution line number of the partial discharge monitoring area by the partial discharge monitoring area to calculate a signal density coefficient sq of the partial discharge monitoring area;
the monitoring intensity value QD of the partial discharge monitoring area is calculated according to the formula, and the formula is specifically as follows:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein a1 and a2 are weight coefficients of fixed values, the values of a1 and a2 are both greater than zero and a1+a2=1;
comparing the monitoring intensity value of the partial discharge monitoring area with the monitoring intensity threshold value:
if the monitoring intensity value is smaller than or equal to the first monitoring intensity threshold value, judging that the monitoring intensity level of the partial discharge monitoring area is the first monitoring intensity level; if the monitoring intensity value is larger than the first monitoring intensity threshold value and smaller than or equal to the second monitoring intensity threshold value, judging that the monitoring intensity level of the partial discharge monitoring area is the second monitoring intensity level; if the monitoring intensity value is larger than the second monitoring intensity threshold value, judging that the monitoring intensity level of the partial discharge monitoring area is a third monitoring intensity level;
the first monitoring intensity threshold value and the second monitoring intensity threshold value are both larger than zero, the first monitoring intensity threshold value is smaller than the second monitoring intensity threshold value, the grade of the first monitoring intensity grade is lower than that of the second monitoring intensity grade, and the grade of the second monitoring intensity grade is lower than that of the third monitoring intensity grade.
Further, the server configures the working bandwidth of the partial discharge monitoring area according to the monitoring intensity level, and the configuration process is specifically as follows:
when the monitoring intensity level of the partial discharge monitoring area is the first monitoring intensity level, the working bandwidth of the ultrahigh frequency omnidirectional sensor is 300 MHz-699 MHz; when the monitoring intensity level of the partial discharge monitoring area is the second monitoring intensity level, the working bandwidth of the ultrahigh frequency omnidirectional sensor is 700 MHz-1099 MHz; when the monitoring intensity level of the partial discharge monitoring area is the third monitoring intensity level, the working bandwidth of the ultra-high frequency omni-directional sensor is 1100 MHz-1500 MHz.
Further, the periodic discharge times are times of partial discharge in the partial discharge monitoring area in each power frequency periodic time period, and the duration values of the power frequency periodic time periods are equal.
Further, the analysis process of the intensity analysis module is specifically as follows:
dividing real-time partial discharge data by using a power frequency period time period, comparing the real-time discharge amplitudes of the partial discharge monitoring areas one by one to obtain the maximum discharge amplitude EFd of the partial discharge monitoring areas, adding and summing the real-time discharge amounts of the partial discharge monitoring areas to obtain the average discharge amount ELd of the partial discharge monitoring areas, wherein d is the number of the power frequency period time period, and d is a non-zero natural number; reading the discharge interval duration of the partial discharge monitoring area, adding, summing and averaging to obtain the average discharge interval duration ETd of the partial discharge monitoring area; reading the cycle discharge frequency ECd of the partial discharge monitoring area;
the partial discharge intensity value QDd of each partial discharge monitoring area is calculated according to the following formula:
；
wherein s1, s2 and s3 are weight coefficients of fixed values, the arrays hi of s1, s2 and s3 are all greater than zero and s1+s2+s3=1;
comparing the partial discharge intensity value of the partial discharge monitoring area with a partial discharge intensity threshold value:
if the partial discharge intensity value is smaller than or equal to the first partial discharge intensity threshold value, judging that the partial discharge intensity level of the partial discharge monitoring area is the first partial discharge intensity level; if the partial discharge intensity value is larger than the first partial discharge intensity threshold value and smaller than or equal to the second partial discharge intensity threshold value, judging that the partial discharge intensity level of the partial discharge monitoring area is the second partial discharge intensity level; if the partial discharge intensity value is larger than the second partial discharge intensity threshold value, judging that the partial discharge intensity level of the partial discharge monitoring area is a third partial discharge intensity level;
the values of the first partial discharge intensity threshold and the second partial discharge intensity threshold are larger than zero, the first partial discharge intensity threshold is smaller than the second partial discharge intensity threshold, the grade of the first partial discharge intensity grade is lower than the grade of the second partial discharge intensity grade, and the grade of the second partial discharge intensity grade is lower than the grade of the third partial discharge intensity grade.
Further, the monitoring process of the loss monitoring module is specifically as follows:
the degradation condition of the insulating material comprises the number of degradation areas of the insulating material in the electric equipment, the degradation area LSt and the degradation depth LHt of each degradation area, t is the serial number of the degradation area, t is a positive integer, and the upper limit value n of t is equal to the numerical value of the degradation area number;
and calculating a degradation influence value YX of the electric equipment according to a formula, wherein the formula is specifically as follows:
；
comparing the degradation influence value of the electric equipment with the degradation influence interval;
if the degradation influence value belongs to the first degradation influence interval, judging that the insulation degradation condition of the electric equipment is a first degradation grade; if the degradation influence value belongs to the second degradation influence interval, judging that the insulation degradation condition of the electric equipment is a second degradation level; if the degradation influence value belongs to the third degradation influence interval, judging that the insulation degradation condition of the electric equipment is a third degradation grade;
the values of the first degradation influence section and the second degradation influence section are smaller than the values of the third degradation influence section, the degradation degree of the insulating material of the first degradation level is lower than that of the insulating material of the second degradation level, and the degradation degree of the insulating material of the second degradation level is lower than that of the insulating material of the third degradation level.
Further, the fault early warning process of the comprehensive early warning module is specifically as follows:
reading the partial discharge intensity level of the partial discharge monitoring area and the insulation degradation condition of the electric equipment;
when the local discharge intensity level of the local discharge monitoring area is a third local discharge intensity level or the insulation degradation condition of the electric equipment is a third degradation level, generating a three-level early warning signal; if the partial discharge intensity level of the partial discharge monitoring area is the second partial discharge intensity level and the insulation degradation condition of the electric equipment is the second degradation level, generating a second-level early warning signal; if the local discharge intensity level of the local discharge monitoring area is the second local discharge intensity level and the insulation degradation condition of the electric equipment is the first degradation level, or if the local discharge intensity level of the local discharge monitoring area is the first local discharge intensity level and the insulation degradation condition of the electric equipment is the second degradation level, generating a first-level early warning signal; if the partial discharge intensity level of the partial discharge monitoring area is the first partial discharge intensity level and the insulation degradation condition of the electric equipment is the first degradation level, no operation is performed.
Further, the corresponding relation between the early warning signal and the maintenance operation is specifically:
when receiving the first-level early warning signal, a worker adaptively adjusts the power distribution condition of the partial discharge monitoring area; when the secondary early warning signal is received, a worker plans to maintain the distribution line of the partial discharge monitoring area and the insulation degradation condition of the electric equipment; when receiving tertiary early warning signal, the staff carries out emergency overhaul to the distribution lines of regional and changes the degradation insulating material among the consumer.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
the invention divides the partial discharge monitoring area by the area dividing module to synchronize with the data acquisition module, then the data acquisition module acquires the area distribution data of the partial discharge monitoring area and transmits the data to the parameter analysis module, then the parameter analysis module is utilized to judge the monitoring intensity of the partial discharge monitoring area, the monitoring intensity level of the partial discharge monitoring area is obtained and transmitted to the server, and then the server configures the working bandwidth of the partial discharge monitoring area according to the monitoring intensity level, thereby realizing low delay fault early warning in the partial discharge monitoring process
In the actual use process after configuration, the real-time partial discharge data of the partial discharge monitoring area are collected through the data collection module and sent to the intensity analysis module, then the intensity analysis module analyzes the partial discharge condition of the partial discharge monitoring area in each power frequency period time period to obtain the partial discharge intensity level of the partial discharge monitoring area, the partial discharge intensity level is sent to the comprehensive early warning module, the deterioration condition of the insulating material in the electric equipment is monitored through the loss monitoring module and is sent to the comprehensive early warning module, finally, an early warning signal is generated through the comprehensive early warning module and is sent to the monitoring terminal, and the monitoring terminal displays the early warning signal.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
FIG. 1 is an overall system block diagram of the present invention;
FIG. 2 is a schematic diagram of the connection of the present invention;
FIG. 3 is a schematic diagram of a loss detection module according to the present invention;
fig. 4 is a flow chart of the method of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
referring to fig. 1-3, the present invention provides a technical solution: the partial discharge fault monitoring system comprises a region dividing module, a data acquisition module, a parameter analysis module, an intensity analysis module, a loss monitoring module, a comprehensive early warning module, a monitoring terminal and a server;
the area dividing module is used for dividing the partial discharge monitoring area and synchronizing the partial discharge monitoring area to the data acquisition module, in the embodiment, an ultrahigh frequency signal generated when partial discharge occurs is monitored through an ultrahigh frequency omni-directional sensor, the monitoring range of the ultrahigh frequency omni-directional sensor is a circular area with the radius of 10m, and the area division is carried out according to the monitoring range of the ultrahigh frequency omni-directional sensor to obtain a plurality of partial discharge monitoring areas;
the data acquisition module is used for acquiring regional power distribution data of the partial discharge monitoring region and transmitting the regional power distribution data of the partial discharge monitoring region to the server, and the server transmits the regional power distribution data of the partial discharge monitoring region to the parameter analysis module; the regional distribution data comprises the number of distribution lines of the partial discharge monitoring region, and the line working voltage and the line working current of each distribution line, and it is understood that as the line working voltage of a plurality of distribution lines in the partial discharge monitoring region gradually rises, discharge signals start to appear, and the discharge repetition rate and the discharge amplitude gradually increase, so that ultrahigh frequency signals are generated;
the parameter analysis module is used for judging the configuration requirement of the partial discharge monitoring area, and the judging process is specifically as follows:
the method comprises the steps of reading the number of distribution lines, line working voltage WVi and line working current WIi of a partial discharge monitoring area, wherein i is the number of the distribution lines, i is a non-zero natural number, the upper limit value of i is n, and the value of n is equal to the value of the number of the distribution lines;
the monitoring area S of the ultra-high frequency omnidirectional sensor is calculated according to the formula, wherein the formula is specifically as follows:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein r is the radius of the monitoring area, and the value of r is 10m;
in the embodiment, the same type of ultrahigh frequency omni-directional sensor is adopted, and the numerical value of the area of the partial discharge monitoring area is calculated and obtained in a similar way to the area S of the monitoring area of the ultrahigh frequency omni-directional sensor;
dividing the number of distribution lines in the partial discharge monitoring area by the area of the partial discharge monitoring area to calculate a signal density coefficient sq of the partial discharge monitoring area, wherein the signal density coefficient of the partial discharge monitoring area can reflect the occurrence frequency of the ultrahigh frequency signals in the partial discharge monitoring area, and the higher the number of the distribution lines in the partial discharge monitoring area is, the higher the occurrence frequency of the ultrahigh frequency signals is;
the monitoring intensity value QD of the partial discharge monitoring area is calculated according to the formula, and the formula is specifically as follows:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein a1 and a2 are weight coefficients of fixed values, the values of a1 and a2 are both greater than zero and a1+a2=1;
comparing the monitoring intensity value of the partial discharge monitoring area with the monitoring intensity threshold value:
if the monitoring intensity value is smaller than or equal to the first monitoring intensity threshold value, judging that the monitoring intensity level of the partial discharge monitoring area is the first monitoring intensity level;
if the monitoring intensity value is larger than the first monitoring intensity threshold value and smaller than or equal to the second monitoring intensity threshold value, judging that the monitoring intensity level of the partial discharge monitoring area is the second monitoring intensity level;
if the monitoring intensity value is larger than the second monitoring intensity threshold value, judging that the monitoring intensity level of the partial discharge monitoring area is a third monitoring intensity level;
the first monitoring intensity threshold value and the second monitoring intensity threshold value are both larger than zero, the first monitoring intensity threshold value is smaller than the second monitoring intensity threshold value, the grade of the first monitoring intensity grade is lower than the grade of the second monitoring intensity grade, and the grade of the second monitoring intensity grade is lower than the grade of the third monitoring intensity grade;
the parameter analysis module sends the monitoring intensity level of the partial discharge monitoring area to the server, and the server configures the working bandwidth of the partial discharge monitoring area according to the monitoring intensity level, wherein the configuration process is specifically as follows:
in this embodiment, the configuration requirement of the partial discharge monitoring area is specifically the working bandwidth of the ultrahigh frequency omni-directional sensor in the partial discharge monitoring area, and the corresponding relationship between the working bandwidth and the monitoring intensity level is specifically as follows:
when the monitoring intensity level of the partial discharge monitoring area is the first monitoring intensity level, the working bandwidth of the ultrahigh frequency omnidirectional sensor is 300 MHz-699 MHz;
when the monitoring intensity level of the partial discharge monitoring area is the second monitoring intensity level, the working bandwidth of the ultrahigh frequency omnidirectional sensor is 700 MHz-1099 MHz;
when the monitoring intensity level of the partial discharge monitoring area is the third monitoring intensity level, the working bandwidth of the ultrahigh frequency omnidirectional sensor is 1100 MHz-1500 MHz;
in the actual use process after configuration, the data acquisition module is further used for acquiring real-time partial discharge data of the partial discharge monitoring area, wherein the real-time partial discharge data comprise real-time discharge amplitude, real-time discharge quantity, periodic discharge times and discharge interval duration of the partial discharge monitoring area, the periodic discharge times are times of partial discharge of the partial discharge monitoring area in each power frequency period, and the duration values of the power frequency period are equal;
the data acquisition module sends the real-time partial discharge data of the partial discharge monitoring area to the server, and the server sends the real-time partial discharge data of the partial discharge monitoring area to the intensity analysis module;
the intensity analysis module is used for analyzing the partial discharge condition of the partial discharge monitoring area in each power frequency period time period, and the analysis process is specifically as follows:
dividing real-time partial discharge data by using a power frequency period time period, comparing the real-time discharge amplitudes of the partial discharge monitoring areas one by one to obtain the maximum discharge amplitude EFd of the partial discharge monitoring areas, adding and summing the real-time discharge amounts of the partial discharge monitoring areas to obtain the average discharge amount ELd of the partial discharge monitoring areas, wherein d is the number of the power frequency period time period, and d is a non-zero natural number; reading the discharge interval duration of the partial discharge monitoring area, adding, summing and averaging to obtain the average discharge interval duration ETd of the partial discharge monitoring area; reading the cycle discharge frequency ECd of the partial discharge monitoring area;
the partial discharge intensity value QDd of each partial discharge monitoring area is calculated according to the following formula:
；
wherein s1, s2 and s3 are weight coefficients of fixed values, the arrays hi of s1, s2 and s3 are all greater than zero and s1+s2+s3=1;
comparing the partial discharge intensity value of the partial discharge monitoring area with a partial discharge intensity threshold value:
if the partial discharge intensity value is smaller than or equal to the first partial discharge intensity threshold value, judging that the partial discharge intensity level of the partial discharge monitoring area is the first partial discharge intensity level;
if the partial discharge intensity value is larger than the first partial discharge intensity threshold value and smaller than or equal to the second partial discharge intensity threshold value, judging that the partial discharge intensity level of the partial discharge monitoring area is the second partial discharge intensity level;
if the partial discharge intensity value is larger than the second partial discharge intensity threshold value, judging that the partial discharge intensity level of the partial discharge monitoring area is a third partial discharge intensity level;
the values of the first partial discharge intensity threshold and the second partial discharge intensity threshold are both larger than zero, the first partial discharge intensity threshold is smaller than the second partial discharge intensity threshold, the level of the first partial discharge intensity level is lower than the level of the second partial discharge intensity level, the level of the second partial discharge intensity level is lower than the level of the third partial discharge intensity level, and it is understood that the partial discharge intensity level reflects the occurrence rate of partial discharge faults in the partial discharge monitoring area, and the higher the level of the partial discharge intensity level is, the larger the value of the occurrence rate of partial discharge faults in the partial discharge monitoring area is;
the intensity analysis module sends the partial discharge intensity level of the partial discharge monitoring area to a server, and the server sends the partial discharge intensity level of the partial discharge monitoring area to the comprehensive early warning module;
referring to fig. 2 and 3, the loss monitoring module is configured to monitor degradation of an insulating material in an electrical device, and the loss monitoring process specifically includes:
as shown in fig. 2, the distribution line in the partial discharge monitoring area provides power support for the electric equipment, and the insulation material degradation condition of the electric equipment is obtained through the infrared imager, it is understood that partial discharge can cause the degradation phenomenon of the insulation material, and continuous partial discharge can cause the insulation material to be broken down so as to lose the insulation characteristic;
as shown in fig. 3, the degradation condition of the insulating material includes the number of degradation regions of the insulating material in the electric device, and the degradation region area LSt and the degradation depth LHt of each degradation region, t is the serial number of the degradation region, t is a positive integer, and the upper limit value n of t is equal to the numerical value of the degradation region number; it is understood that the degradation area of the insulating material is equivalent to the depression area of the surface of the insulating material, the degradation area is the area of the depression area, and the degradation depth is the distance from the deepest portion of the depression area to the surface of the insulating material;
and calculating a degradation influence value YX of the electric equipment according to a formula, wherein the formula is specifically as follows:
；
comparing the degradation influence value of the electric equipment with the degradation influence interval;
if the degradation influence value belongs to the first degradation influence interval, judging that the insulation degradation condition of the electric equipment is a first degradation grade;
if the degradation influence value belongs to the second degradation influence interval, judging that the insulation degradation condition of the electric equipment is a second degradation level;
if the degradation influence value belongs to the third degradation influence interval, judging that the insulation degradation condition of the electric equipment is a third degradation grade;
wherein the values of the first degradation affecting zone are smaller than the values of the second degradation affecting zone, the values of the second degradation affecting zone are smaller than the values of the third degradation affecting zone, the degradation degree of the insulating material of the first degradation level is lower than the degradation degree of the insulating material of the second degradation level, and the degradation degree of the insulating material of the second degradation level is lower than the degradation degree of the insulating material of the third degradation level;
the loss monitoring module sends the insulation degradation condition of the electric equipment to a server, and the server sends the insulation degradation condition of the electric equipment to the comprehensive early warning module;
the comprehensive early warning module is used for early warning partial discharge faults, and the fault early warning process is specifically as follows:
reading the partial discharge intensity level of the partial discharge monitoring area and the insulation degradation condition of the electric equipment;
when the local discharge intensity level of the local discharge monitoring area is a third local discharge intensity level or the insulation degradation condition of the electric equipment is a third degradation level, generating a three-level early warning signal;
if the partial discharge intensity level of the partial discharge monitoring area is the second partial discharge intensity level and the insulation degradation condition of the electric equipment is the second degradation level, generating a second-level early warning signal;
if the local discharge intensity level of the local discharge monitoring area is the second local discharge intensity level and the insulation degradation condition of the electric equipment is the first degradation level, or if the local discharge intensity level of the local discharge monitoring area is the first local discharge intensity level and the insulation degradation condition of the electric equipment is the second degradation level, generating a first-level early warning signal;
if the partial discharge intensity level of the partial discharge monitoring area is the first partial discharge intensity level and the insulation degradation condition of the electric equipment is the first degradation level, no operation is performed;
the comprehensive early warning module sends an early warning signal to a server, and the server sends the early warning signal to a monitoring terminal;
the monitoring terminal is used for displaying the early warning signal and arranging workers to carry out maintenance operation of electric equipment according to the early warning signal:
when receiving the first-level early warning signal, a worker adaptively adjusts the power distribution condition of the partial discharge monitoring area;
when the secondary early warning signal is received, a worker plans to maintain the distribution line of the partial discharge monitoring area and the insulation degradation condition of the electric equipment;
when receiving the three-level early warning signal, a worker carries out emergency maintenance on the distribution line of the partial discharge area and replaces the deteriorated insulating material in the electric equipment;
in the present application, if a corresponding calculation formula appears, the above calculation formulas are all dimensionality-removed and numerical calculation, and the size of the weight coefficient, the scale coefficient and other coefficients existing in the formulas is a result value obtained by quantizing each parameter, so long as the proportional relation between the parameter and the result value is not affected.
Example 2:
based on another concept of the same invention, a partial discharge fault monitoring method is now provided, which comprises the following steps:
step S101, dividing a partial discharge monitoring area by an area dividing module, synchronizing the partial discharge monitoring area to a data acquisition module, acquiring area distribution data of the partial discharge monitoring area by the data acquisition module, and transmitting the area distribution data to a parameter analysis module through a server;
step S102, a parameter analysis module judges the monitoring intensity level of the partial discharge monitoring area and sends the monitoring intensity level to a server, and the server configures the working bandwidth of the partial discharge monitoring area according to the monitoring intensity level;
step S103, after configuration, the data acquisition module acquires real-time partial discharge data of the partial discharge monitoring area and sends the data to the intensity analysis module, and the intensity analysis module analyzes partial discharge conditions of the partial discharge monitoring area in each power frequency period time period to obtain a partial discharge intensity level of the partial discharge monitoring area and sends the partial discharge intensity level to the comprehensive early warning module;
and step S104, the loss monitoring module monitors the degradation condition of the insulating material in the electric equipment, the insulation degradation condition of the electric equipment is sent to the comprehensive early-warning module, the comprehensive early-warning module carries out early warning on the partial discharge fault, an early-warning signal is generated and sent to the monitoring terminal, and the monitoring terminal displays the early-warning signal.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (7)
1. The partial discharge fault monitoring system is characterized by comprising a region dividing module, a data acquisition module, a parameter analysis module, an intensity analysis module, a loss monitoring module, a comprehensive early warning module, a monitoring terminal and a server;
the regional division module is used for dividing the partial discharge monitoring region and synchronizing the regional discharge monitoring region to the data acquisition module, the data acquisition module is used for acquiring regional power distribution data of the partial discharge monitoring region and transmitting the regional power distribution data to the parameter analysis module through the server, and the parameter analysis module is used for judging the monitoring intensity of the partial discharge monitoring region, and the judging process is specifically as follows:
the method comprises the steps of reading the number of distribution lines, line working voltage WVi and line working current WIi of a partial discharge monitoring area, wherein i is the number of the distribution lines, i is a non-zero natural number, the upper limit value of i is n, and the value of n is equal to the value of the number of the distribution lines;
the monitoring area S of the ultra-high frequency omnidirectional sensor is calculated according to the formula, wherein the formula is specifically as follows:
S＝πr 2 ；
wherein r is the radius of the monitoring area, and the value of r is 10m;
the same model of ultra-high frequency omni-directional sensor is adopted, and the numerical value of the area of the partial discharge monitoring area is equal to the area S of the monitoring area of the ultra-high frequency omni-directional sensor;
dividing the distribution line number of the partial discharge monitoring area by the partial discharge monitoring area to calculate a signal density coefficient sq of the partial discharge monitoring area;
the monitoring intensity value QD of the partial discharge monitoring area is calculated according to the formula, and the formula is specifically as follows:
wherein a1 and a2 are weight coefficients of fixed values, the values of a1 and a2 are both greater than zero and a1+a2=1;
comparing the monitoring intensity value of the partial discharge monitoring area with the monitoring intensity threshold value:
if the monitoring intensity value is smaller than or equal to the first monitoring intensity threshold value, judging that the monitoring intensity level of the partial discharge monitoring area is the first monitoring intensity level; if the monitoring intensity value is larger than the first monitoring intensity threshold value and smaller than or equal to the second monitoring intensity threshold value, judging that the monitoring intensity level of the partial discharge monitoring area is the second monitoring intensity level; if the monitoring intensity value is larger than the second monitoring intensity threshold value, judging that the monitoring intensity level of the partial discharge monitoring area is a third monitoring intensity level;
the first monitoring intensity threshold value and the second monitoring intensity threshold value are both larger than zero, the first monitoring intensity threshold value is smaller than the second monitoring intensity threshold value, the grade of the first monitoring intensity grade is lower than the grade of the second monitoring intensity grade, and the grade of the second monitoring intensity grade is lower than the grade of the third monitoring intensity grade;
the parameter analysis module sends the monitoring intensity level of the partial discharge monitoring area obtained by analysis to the server, and the server configures the working bandwidth of the partial discharge monitoring area according to the monitoring intensity level, wherein the configuration process of the working bandwidth is specifically as follows:
when the monitoring intensity level of the partial discharge monitoring area is the first monitoring intensity level, the working bandwidth of the ultrahigh frequency omnidirectional sensor is 300 MHz-699 MHz;
when the monitoring intensity level of the partial discharge monitoring area is the second monitoring intensity level, the working bandwidth of the ultrahigh frequency omnidirectional sensor is 700 MHz-1099 MHz;
when the monitoring intensity level of the partial discharge monitoring area is the third monitoring intensity level, the working bandwidth of the ultrahigh frequency omnidirectional sensor is 1100 MHz-1500 MHz;
the system comprises a data acquisition module, an intensity analysis module, a comprehensive early warning module, a server, a power frequency period time period monitoring module, a power frequency monitoring terminal, a power frequency consumption monitoring module and a loss monitoring module, wherein the data acquisition module is also used for acquiring real-time partial discharge data of a partial discharge monitoring area and sending the real-time partial discharge data to the intensity analysis module through the server;
the regional distribution data comprises the distribution line number of the partial discharge monitoring region, and the line working voltage and the line working current of each distribution line; the real-time partial discharge data comprises real-time discharge amplitude, real-time discharge quantity, periodic discharge times and discharge interval duration of the partial discharge monitoring area.
2. The partial discharge fault monitoring system according to claim 1, wherein the area dividing module monitors an ultrahigh frequency signal generated when partial discharge occurs through an ultrahigh frequency omni-directional sensor, and the monitoring range of the ultrahigh frequency omni-directional sensor is a circular area with a radius of 10 m.
3. The partial discharge fault monitoring system according to claim 1, wherein the number of periodic discharges is the number of partial discharges occurring in the partial discharge monitoring area in each power frequency period, and the duration values of each power frequency period are equal.
4. A partial discharge fault monitoring system according to claim 3, characterized in that the analysis process of the intensity analysis module is specifically as follows:
dividing real-time partial discharge data by using a power frequency period time period, comparing the real-time discharge amplitudes of the partial discharge monitoring areas one by one to obtain the maximum discharge amplitude EFd of the partial discharge monitoring areas, adding and summing the real-time discharge amounts of the partial discharge monitoring areas to obtain the average discharge amount ELd of the partial discharge monitoring areas, wherein d is the number of the power frequency period time period, and d is a non-zero natural number; reading the discharge interval duration of the partial discharge monitoring area, adding, summing and averaging to obtain the average discharge interval duration ETd of the partial discharge monitoring area; reading the cycle discharge frequency ECd of the partial discharge monitoring area;
the partial discharge intensity value QDd of each partial discharge monitoring area is calculated according to the following formula:
wherein s1, s2 and s3 are weight coefficients of fixed values, the arrays hi of s1, s2 and s3 are all greater than zero and s1+s2+s3=1;
comparing the partial discharge intensity value of the partial discharge monitoring area with a partial discharge intensity threshold value:
if the partial discharge intensity value is smaller than or equal to the first partial discharge intensity threshold value, judging that the partial discharge intensity level of the partial discharge monitoring area is the first partial discharge intensity level; if the partial discharge intensity value is larger than the first partial discharge intensity threshold value and smaller than or equal to the second partial discharge intensity threshold value, judging that the partial discharge intensity level of the partial discharge monitoring area is the second partial discharge intensity level; if the partial discharge intensity value is larger than the second partial discharge intensity threshold value, judging that the partial discharge intensity level of the partial discharge monitoring area is a third partial discharge intensity level;
the values of the first partial discharge intensity threshold and the second partial discharge intensity threshold are larger than zero, the first partial discharge intensity threshold is smaller than the second partial discharge intensity threshold, the grade of the first partial discharge intensity grade is lower than the grade of the second partial discharge intensity grade, and the grade of the second partial discharge intensity grade is lower than the grade of the third partial discharge intensity grade.
5. The partial discharge fault monitoring system of claim 1, wherein the monitoring process of the loss monitoring module is specifically as follows:
the degradation condition of the insulating material comprises the number of degradation areas of the insulating material in the electric equipment, the degradation area LSt and the degradation depth LHt of each degradation area, t is the serial number of the degradation area, t is a positive integer, and the upper limit value n of t is equal to the numerical value of the degradation area number;
and calculating a degradation influence value YX of the electric equipment according to a formula, wherein the formula is specifically as follows:
comparing the degradation influence value of the electric equipment with the degradation influence interval;
if the degradation influence value belongs to the first degradation influence interval, judging that the insulation degradation condition of the electric equipment is a first degradation grade; if the degradation influence value belongs to the second degradation influence interval, judging that the insulation degradation condition of the electric equipment is a second degradation level; if the degradation influence value belongs to the third degradation influence interval, judging that the insulation degradation condition of the electric equipment is a third degradation grade;
the values of the first degradation influence section and the second degradation influence section are smaller than the values of the third degradation influence section, the degradation degree of the insulating material of the first degradation level is lower than that of the insulating material of the second degradation level, and the degradation degree of the insulating material of the second degradation level is lower than that of the insulating material of the third degradation level.
6. The partial discharge fault monitoring system of claim 5, wherein the fault pre-warning process of the comprehensive pre-warning module is specifically as follows:
reading the partial discharge intensity level of the partial discharge monitoring area and the insulation degradation condition of the electric equipment;
when the local discharge intensity level of the local discharge monitoring area is a third local discharge intensity level or the insulation degradation condition of the electric equipment is a third degradation level, generating a three-level early warning signal; if the partial discharge intensity level of the partial discharge monitoring area is the second partial discharge intensity level and the insulation degradation condition of the electric equipment is the second degradation level, generating a second-level early warning signal; if the local discharge intensity level of the local discharge monitoring area is the second local discharge intensity level and the insulation degradation condition of the electric equipment is the first degradation level, or if the local discharge intensity level of the local discharge monitoring area is the first local discharge intensity level and the insulation degradation condition of the electric equipment is the second degradation level, generating a first-level early warning signal; if the partial discharge intensity level of the partial discharge monitoring area is the first partial discharge intensity level and the insulation degradation condition of the electric equipment is the first degradation level, no operation is performed.
7. The partial discharge fault monitoring system of claim 6, wherein the correspondence between the early warning signal and the maintenance operation is specifically:
when receiving the first-level early warning signal, a worker adaptively adjusts the power distribution condition of the partial discharge monitoring area;
when the secondary early warning signal is received, a worker plans to maintain the distribution line of the partial discharge monitoring area and the insulation degradation condition of the electric equipment;
when receiving tertiary early warning signal, the staff carries out emergency overhaul to the distribution lines of regional and changes the degradation insulating material among the consumer.
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