CN109001604B - Intensity grading system and method based on partial discharge of electrical equipment - Google Patents
Intensity grading system and method based on partial discharge of electrical equipment Download PDFInfo
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- G01R31/1218—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 using optical methods; using charged particle, e.g. electron, beams or X-rays
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Abstract
The invention provides an intensity grading system and method based on partial discharge of electrical equipment. The system comprises a plurality of optical signal transmission units, a plurality of signal conditioning units, a plurality of data acquisition cards and a data terminal. The method of the invention utilizes the switch cabinet to establish a three-dimensional coordinate system, and the length, the width and the height of the switch cabinet are respectively superposed with the axis of the three-dimensional coordinate system; the collimating mirror probes in the multiple optical signal transmission units are divided into multiple groups and are placed symmetrically; acquiring real-time voltage digital signals obtained by converting partial discharge radiation ultraviolet light through a corresponding optical signal transmission unit, a signal conditioning unit and a data acquisition card, and transmitting the real-time voltage digital signals to a data terminal; the data terminal counts the pulse number of the real-time voltage digital signal and carries out weighting calculation, the high-voltage partial discharge source is arranged in the switch cabinet, a plurality of levels of discharge power are set to construct a pulse array matrix, and partial discharge intensity classification is established through the pulse array matrix and the plurality of levels of discharge power.
Description
Technical Field
The invention belongs to the technical field of electrical equipment partial discharge monitoring, and particularly relates to an intensity grading system and method based on electrical equipment partial discharge.
Background
China's electric power system is developing towards large-scale, long-distance, extra-high voltage, intelligent and AC/DC hybrid power transmission. The safe operation of the electrical equipment is an important guarantee for the safe and reliable operation of the power grid, however, the quality defects of the electrical equipment in the design and manufacturing process, the mechanical damage caused in the transportation and installation process, and the long-term operation in high voltage, strong electric field and severe weather environment all become factors for reducing the insulation performance of the electrical equipment. The partial discharge with small scale and slight intensity for a long time is a main cause of further reduction of the insulation performance of the insulator of the electrical equipment, the scale, the frequency and the intensity of the partial discharge gradually increase along with the accumulation of time, and the insulation condition of the electrical equipment forms a positive feedback type vicious circle, so that the whole insulation system is finally damaged. Serious insulation accidents may threaten the safety of workers, cause large-area power failure accidents and bring economic losses. Therefore, the insulation performance of the electrical equipment directly influences whether the electrical equipment can safely operate.
The partial discharge detection is an effective means and an evaluation method for judging the insulation performance of the electrical equipment, however, for partial discharge caused by the reduction of the insulation performance of the equipment, a set of effective partial discharge strength grade evaluation is required to quantify the strength of the insulation performance of the equipment.
Disclosure of Invention
In view of the above problems in the prior art, the present invention provides a system and method for grading the intensity of partial discharge of electrical equipment. The hardware part of the invention uses the pulse current output by the conversion of the ultraviolet band optical signal contained in the partial discharge through the photoelectric sensor group as the basis of the whole monitoring system.
The technical scheme of the system is characterized by comprising a first optical signal transmission unit, a.once and an Nth optical signal transmission unit, a first signal conditioning unit, a.once and an Nth signal conditioning unit, a first data acquisition card, a.once and an Nth data acquisition card and a data terminal, wherein N is more than 0;
the first optical signal transmission unit and the first signal conditioning unit are in optical coupling connection with a photoelectric sensor in the first signal conditioning unit through a focusing lens probe in the first optical signal transmission unit; ...; the Nth optical signal transmission unit and the Nth signal conditioning unit are in optical coupling connection with a photoelectric sensor in the Nth signal conditioning unit through a focusing lens probe in the Nth optical signal transmission unit; the first signal conditioning unit is connected with the data acquisition card through a wire; ...; the Nth signal conditioning unit is connected with the data acquisition card through a wire; the first data acquisition card is connected with the data terminal; ...; the Nth data acquisition card is connected with the data terminal;
preferably, the ith optical signal transmission unit is characterized by comprising a collimating mirror probe, an ultraviolet optical fiber and a focusing mirror probe; the collimating lens probe is connected with the focusing lens probe through the ultraviolet optical fiber, i belongs to [1, N ], and N is greater than 0.
Preferably, the ith signal conditioning unit is characterized by comprising a photoelectric sensor, a direct-current power supply module, a filtering module, an operational amplifier and a voltage comparator; the photoelectric sensor, the direct-current power supply module, the filtering module, the operational amplifier module and the voltage comparator module are sequentially connected in series through a lead, i belongs to [1, N ], and N is larger than 0.
Preferably, in the ith optical signal transmission unit, the collimator lens probe reduces the loss of coupling into the ultraviolet optical fiber by reducing the divergence angle of the light beam; the ultraviolet optical fiber is used for transmitting an ultraviolet signal; and the focusing mirror probe focuses the optical signal emitted by the tail fiber and couples the optical signal to the photoelectric sensor in the ith signal conditioning unit.
Preferably, in the ith signal conditioning unit, the direct-current power supply module directly drives the photoelectric sensor; the filtering module is used for enabling the direct current component obtained through photoelectric conversion to pass through and suppressing interference and noise; the operational amplifier module is used for amplifying the filtered acquired signal; the voltage comparator converts the filtered acquired signal into a high-low level signal, i belongs to [1, N ], and N is greater than 0;
preferably, the ith data acquisition card converts the high-low level signals obtained by conversion into digital signals, i belongs to [1, N ], and N is more than 0
Preferably, the data terminal counts the frequency of the rising edges and records the frequency as the number of pulses.
The technical scheme of the method is that the intensity grading method based on the partial discharge of the electrical equipment is characterized by comprising the following steps of:
step 1: establishing a three-dimensional coordinate system by using a switch cabinet, wherein the length, the width and the height of the switch cabinet are respectively superposed with the axis of the three-dimensional coordinate system;
step 2: dividing collimating mirror probes carried by N optical signal transmission units required for partial discharge detection into a plurality of groups, and symmetrically placing the groups;
and step 3: the real-time voltage digital signals obtained by converting partial discharge radiation ultraviolet light are collected by utilizing a signal conditioning unit and a data acquisition card which are respectively carried by the N optical signal transmission units and are transmitted to a data terminal;
and 4, step 4: the data terminal counts the pulse number of the real-time voltage digital signal and carries out weighting calculation, a high-voltage partial discharge source is arranged in the switch cabinet, a plurality of levels of discharge power are set to construct a pulse array matrix, and the intensity classification of partial discharge is established through the pulse array matrix and the plurality of levels of discharge power;
preferably, the length, width and height of the switch cabinet in step 1 are respectively combined with the axis of the three-dimensional coordinate system as follows:
the length of the switch cabinet is that a coincides with a coordinate axis x, the width of the switch cabinet is that b coincides with a coordinate axis y, and the height of the switch cabinet is that c coincides with a coordinate axis z;
preferably, N in step 2 is an even number;
in the step 2, the collimating lenses of the N optical signal transmission units are divided into N/2 groups in pairs;
in the step 2, the symmetrically placed state is that two collimating mirror probes contained in each group are respectively placed in an angle according to the face center, the top angle and the middle point of the edge of the cuboid model established by the switch cabinet;
the collimator probe of each point is marked as L1,L2,L3……LN；
Preferably, the collection in step 3 is: in the ith optical signal transmission unit, the collimator lens probe reduces the loss of coupling into the ultraviolet optical fiber by reducing the divergence angle of the light beam; the ultraviolet optical fiber transmits an ultraviolet signal; the focusing mirror probe focuses an ultraviolet light signal emitted by the ultraviolet optical fiber and couples the ultraviolet light signal to the photoelectric sensor in the ith signal conditioning unit; in the ith signal conditioning unit, the direct-current power supply module directly drives the photoelectric sensor; the filtering module enables the direct current component obtained through photoelectric conversion to pass through, and interference and noise are suppressed; the operational amplifier module amplifies the filtered acquired signal; the voltage comparator converts the filtered acquisition signals into high and low level signals, and the high and low level signals obtained through conversion are converted into real-time voltage digital signals through an ith data acquisition card and transmitted to the data terminal;
preferably, the data terminal in step 4 counts the number of pulses of the real-time voltage digital signal as follows: a. the1,A2,A3……AN；
The weighting calculation in step 4 is not:
following the volume of the model established by the switch cabinet in the step 1 as abc, and assuming that the probability of partial discharge in the switch cabinet area is equal everywhere, the discharge probability density function expression is as follows:
f＝1/abc
under the condition that the N collimator lens probes in the first optical signal transmission unit to the nth optical signal transmission unit can cover the whole internal area of the switch cabinet, the integral of the probability density function f on the monitored effective space range in the N collimator lens probes is the weighting coefficient of the collimator lens probe:
wherein, ViThe sum of the pulse density weights counted for the whole system is recorded as:
4, arranging the high-voltage partial discharge source in the switch cabinet to simulate partial discharge of the electrical equipment caused by insulation degradation and set partial discharge power Pj，j∈[1,M],M＞0；
In the step 4, the multiple-grade discharge power is set to construct a pulse array matrix as follows: testing under the condition of changing the high-voltage partial discharge power to obtain M groups of statistical pulse array matrixes matrix under different partial discharge source powers:
wherein A isj,ij∈[1,M],i∈[1,N]The pulse number of the ith collimating mirror in the jth group of partial discharge power is set; processing each row of the matrix in the weighting manner to obtain a weighting vector H:
H＝[W1 W2 … Wj … WM]T
wherein, WjThe sum of the pulse density weights of the jth group of partial discharge power;
the intensity of the partial discharge in step 4 is graded as:
mapping of the pulse weighting vector to the partial discharge intensity can be obtained:
wherein, the pulse density weight and W of the j group partial discharge powerjAnd the j group partial discharge power PjCorrespondingly, an partial discharge alarm level R can be established at the data terminal according to the data in the P vector1,R2,R3…RMThe device can realize real-time monitoring of partial discharge of high-voltage equipment running in the switch cabinet due to insulation degradation and give an alarm level.
The invention has the beneficial effects that:
the optical passive device group related by the invention has good anti-interference characteristic under high-pressure environment and adopts the device only responding to the ultraviolet wave band to avoid the real-time detection interference of the atmospheric spectrum to the system, thereby improving the reliability of the system.
The process of converting ultraviolet energy carried by partial discharge into signal pulse greatly reduces the difficulty of a method for evaluating discharge intensity by performing direct power measurement or light intensity measurement through partial discharge.
The invention can finally carry out grade evaluation on the partial discharge of the equipment caused by the reduction of the insulativity by weighting the pulse and the calibration process of the pulse weight and the partial discharge power so as to be used as the effective reference of the current equipment condition.
Drawings
FIG. 1: the invention is a system structure block diagram;
FIG. 2: the method of the invention is a flow chart.
Detailed Description
In order to facilitate the understanding and implementation of the present invention for those of ordinary skill in the art, the present invention is further described in detail with reference to the accompanying drawings and examples, it is to be understood that the embodiments described herein are merely illustrative and explanatory of the present invention and are not restrictive thereof.
FIG. 1 is a block diagram of the system of the present invention. The technical scheme of the hardware part implementation mode of the invention comprises a first optical signal transmission unit, a.once.an Nth optical signal transmission unit, a first signal conditioning unit, a.once.an Nth signal conditioning unit, a first data acquisition card, a.once.an Nth data acquisition card and a data terminal, wherein N is more than 0; the first optical signal transmission unit and the first signal conditioning unit are in optical coupling connection with a photoelectric sensor in the first signal conditioning unit through a probe part of a focusing mirror in the first optical signal unit; ...; the Nth optical signal transmission unit and the Nth signal conditioning unit are in optical coupling connection with a photoelectric sensor in the first signal conditioning unit through a probe part of a focusing mirror in the first optical signal unit; the first signal conditioning unit is connected with the first data acquisition card through a wire; ...; the Nth signal conditioning unit is connected with the Nth data acquisition card through a wire; the data acquisition card is connected with the data terminal; the ith optical signal transmission unit is characterized by comprising a collimating mirror probe, an ultraviolet optical fiber and a focusing mirror probe; the collimating lens probe and the focusing lens probe are connected at two ends of the ultraviolet optical fiber through specific interfaces, i belongs to [1, N ], and N is greater than 0; the ith signal conditioning unit is characterized by comprising a photoelectric sensor, a direct-current power supply module, a filtering module, an operational amplifier and a voltage comparator; the photoelectric sensor, the direct-current power supply module, the filtering module, the operational amplifier module and the voltage comparator module are sequentially connected in series through a lead, i belongs to [1, N ], N is greater than 0, and N is 12.
In the ith optical signal transmission unit, the collimator lens probe reduces the loss of coupling into the ultraviolet optical fiber by reducing the divergence angle of the light beam; the ultraviolet optical fiber is used for transmitting an ultraviolet signal; and the focusing mirror probe focuses the optical signal emitted by the tail fiber and couples the optical signal to the photoelectric sensor in the ith signal conditioning unit.
In the ith signal conditioning unit, the direct-current power supply module directly drives the photoelectric sensor; the filtering module is used for enabling the direct current component obtained through photoelectric conversion to pass through and suppressing interference and noise; the operational amplifier module is used for amplifying the filtered acquired signal; the voltage comparator converts the filtered acquisition signal into a high-low level signal, i belongs to [1, N ], N is larger than 0, for the high-low level signal obtained by conversion, the frequency of rising edges of the high-low level signal is counted and recorded as the pulse number, and N is 12.
The system comprises a collimating mirror probe W-75UV, AN ultraviolet optical fiber XSR600-3.0, a focusing mirror probe 75X-UV, a photoelectric sensor R2868, a direct-current power supply module AN50805, a filter module PLP-600, AN operational amplifier RS521SXK, a voltage comparator lm393, a data acquisition card USB3200 and a data terminal PC; n-12 and M-20.
The technical scheme of the method is that the intensity grading method for monitoring partial discharge of the electrical equipment based on the ultraviolet light is characterized by comprising the following steps of:
step 1: establishing a three-dimensional coordinate system by using a switch cabinet, wherein the length, the width and the height of the switch cabinet are respectively superposed with the axis of the three-dimensional coordinate system;
preferably, the length, width and height of the switch cabinet in step 1 are respectively combined with the axis of the three-dimensional coordinate system as follows:
the length of the switch cabinet is that a coincides with a coordinate axis x, the width of the switch cabinet is that b coincides with a coordinate axis y, and the height of the switch cabinet is that c coincides with a coordinate axis z;
step 2: dividing the collimating mirror probes carried by the N-12 optical signal transmission units required for carrying out partial discharge detection into a plurality of groups, and symmetrically placing the groups;
preferably, N-12 in step 2 is an even number;
in step 2, the collimating lenses of the N-12 optical signal transmission units are divided into N/2 groups in pairs;
in the step 2, the symmetrically placed state is that two collimating mirror probes contained in each group are respectively placed in an angle according to the face center, the top angle and the middle point of the edge of the cuboid model established by the switch cabinet;
the collimator probe of each point is marked as L1,L2,L3……LN；
And step 3: the real-time voltage digital signals obtained by converting partial discharge radiation ultraviolet light are collected by using a signal conditioning unit and a data acquisition card which are respectively carried by an N-12 optical signal transmission unit and are transmitted to a data terminal;
the acquisition in step 3 is as follows: in the ith optical signal transmission unit, the collimator lens probe reduces the loss of coupling into the ultraviolet optical fiber by reducing the divergence angle of the light beam; the ultraviolet optical fiber transmits an ultraviolet signal; the focusing mirror probe focuses an ultraviolet light signal emitted by the ultraviolet optical fiber and couples the ultraviolet light signal to the photoelectric sensor in the ith signal conditioning unit; in the ith signal conditioning unit, the direct-current power supply module directly drives the photoelectric sensor; the filtering module enables the direct current component obtained through photoelectric conversion to pass through, and interference and noise are suppressed; the operational amplifier module amplifies the filtered acquired signal; the voltage comparator converts the filtered acquisition signals into high and low level signals, and the high and low level signals obtained through conversion are converted into real-time voltage digital signals through an ith data acquisition card and transmitted to the data terminal;
and 4, step 4: the data terminal counts the pulse number of the real-time voltage digital signal and carries out weighting calculation, a high-voltage partial discharge source is arranged in the switch cabinet, a plurality of levels of discharge power are set to construct a pulse array matrix, and the intensity classification of partial discharge is established through the pulse array matrix and the plurality of levels of discharge power;
preferably, the data terminal in step 4 counts the number of pulses of the real-time voltage digital signal as follows: a. the1,A2,A3……AN；
The weighting calculation in step 4 is not:
following the volume of the model established by the switch cabinet in the step 1 as abc, and assuming that the probability of partial discharge in the switch cabinet area is equal everywhere, the discharge probability density function expression is as follows:
f＝1/abc
under the condition that N-12 collimator lens probes in the first to N-12 optical signal transmission units can cover the entire switch cabinet internal area, the integral of the probability density function f to the effective space range that N-12 collimator lens probes can monitor is the weighting coefficient of the collimator lens probe:
wherein, ViThe sum of the pulse density weights counted for the whole system is recorded as:
4, arranging the high-voltage partial discharge source in the switch cabinet to simulate partial discharge of the electrical equipment caused by insulation degradation and set partial discharge power Pj，M＝20，j∈[1,M],M＞0；
In the step 4, the multiple-grade discharge power is set to construct a pulse array matrix as follows: testing under the condition of changing high-voltage partial discharge power to obtain M-20 groups of statistical pulse array matrixes matrix under different partial discharge source powers:
wherein A isj,ij∈[1,M],i∈[1,N]The pulse number of the ith collimating mirror in the jth group of partial discharge power is N-12, and M-20;
processing each row of the matrix in the weighting manner to obtain a weighting vector H:
H＝[W1 W2 … Wj … WM]T
wherein, WjThe sum of the pulse density weights of the jth group of partial discharge power;
the intensity of the partial discharge in step 4 is graded as:
mapping of the pulse weighting vector to the partial discharge intensity can be obtained:
wherein, the pulse density weight and W of the j group partial discharge powerjAnd the j group partial discharge power PjCorrespondingly, an partial discharge alarm level R can be established at the data terminal according to the data in the P vector1,R2,R3…RMThe device can realize real-time monitoring of partial discharge of high-voltage equipment running in the switch cabinet due to insulation degradation and give an alarm level.
Claims (5)
1. A grading method of an intensity grading system based on partial discharge of electrical equipment is characterized in that: the system for grading the intensity of partial discharge of the electrical equipment comprises: the system comprises a first optical signal transmission unit, a first photo-signal transmission unit, an Nth photo-signal transmission unit, a first signal conditioning unit, a first photo-signal conditioning unit, an Nth signal conditioning unit, a first data acquisition card, a first photo-signal transmission unit, an Nth data acquisition card and a data terminal, wherein N is more than 0 and is a positive integer;
the first optical signal transmission unit and the first signal conditioning unit are in optical coupling connection with a photoelectric sensor in the first signal conditioning unit through a focusing lens probe in the first optical signal transmission unit; ...; the Nth optical signal transmission unit and the Nth signal conditioning unit are in optical coupling connection with a photoelectric sensor in the Nth signal conditioning unit through a focusing lens probe in the Nth optical signal transmission unit; the first signal conditioning unit is connected with the data acquisition card through a wire; ...; the Nth signal conditioning unit is connected with the data acquisition card through a wire; the first data acquisition card is connected with the data terminal; ...; the Nth data acquisition card is connected with the data terminal;
the ith optical signal transmission unit consists of a collimating lens probe, an ultraviolet optical fiber and a focusing lens probe; the collimating lens probe is connected with the focusing lens probe through the ultraviolet optical fiber; the ith signal conditioning unit consists of a photoelectric sensor, a direct current power supply module, a filtering module, an operational amplifier and a voltage comparator, wherein the photoelectric sensor, the direct current power supply module, the filtering module, the operational amplifier module and the voltage comparator module are sequentially connected in series through a lead, i belongs to [1, N ], N is more than 0 and N is a positive integer;
the ith optical signal transmission unit is used for converting the partial discharge signal into an ultraviolet signal, and the ith signal conditioning unit is used for converting the ultraviolet signal into a high-low level signal; the ith data acquisition card converts the high-low level signals obtained by conversion into digital signals, the data terminal counts the frequency of the rising edge and records the frequency as the pulse number, i belongs to [1, N ], N is more than 0 and N is a positive integer;
the collimator probe reduces the loss of coupling into the ultraviolet optical fiber in a mode of reducing the divergence angle of the light beam; the ultraviolet optical fiber is used for transmitting an ultraviolet signal; the focusing mirror probe focuses the optical signal emitted by the tail fiber and couples the optical signal to the photoelectric sensor in the ith signal conditioning unit, i belongs to [1, N ], N is more than 0 and N is a positive integer;
the direct-current power supply module directly drives the photoelectric sensor; the filtering module is used for enabling the direct current component obtained through photoelectric conversion to pass through and suppressing interference and noise; the operational amplifier module is used for amplifying the filtered acquired signal; the voltage comparator converts the filtered acquired signal into a high-low level signal, i belongs to [1, N ], N is greater than 0, and N is a positive integer;
the grading method comprises the following steps:
step 1: establishing a three-dimensional coordinate system by using a switch cabinet, wherein the length, the width and the height of the switch cabinet are respectively superposed with the axis of the three-dimensional coordinate system;
step 2: dividing collimating mirror probes carried by N optical signal transmission units required for partial discharge detection into a plurality of groups, and symmetrically placing the groups;
and step 3: the real-time voltage digital signals obtained by converting partial discharge radiation ultraviolet light are collected by using signal conditioning units carried by N optical signal transmission units and a data acquisition card and are transmitted to a data terminal;
and 4, step 4: the data terminal counts the pulse number of the real-time voltage digital signal and carries out weighting calculation, the high-voltage partial discharge source is arranged in the switch cabinet, a plurality of levels of discharge power are set to construct a pulse array matrix, and partial discharge intensity classification is established through the pulse array matrix and the plurality of levels of discharge power.
2. The grading method based on intensity grading system of partial discharge of electrical equipment according to claim 1, characterized in that the length, width and height of the switchgear cabinet in step 1 are respectively combined with the axis of the three-dimensional coordinate system as:
the length of the switch cabinet is a, the width of the switch cabinet is b, and the height of the switch cabinet is c, and the length of the switch cabinet coincides with a coordinate axis x, the width of the switch cabinet coincides with a coordinate axis y, and the height of the switch cabinet coincides with a coordinate axis z.
3. The grading method based on an intensity grading system of partial discharge of electrical equipment according to claim 1, characterized in that N in step 2 is an even number;
in the step 2, the collimating lenses of the N optical signal transmission units are divided into N/2 groups in pairs;
in the step 2, the symmetrically placed state is that two collimating mirror probes contained in each group are respectively placed in an angle according to the face center, the top angle and the middle point of the edge of the cuboid model established by the switch cabinet;
the collimator probe of each point is marked as L1,L2,L3……LN。
4. The grading method based on an intensity grading system of partial discharge of electrical equipment according to claim 1, characterized in that the acquisition in step 3 is: in the ith optical signal transmission unit, the collimator lens probe reduces the loss of coupling into the ultraviolet optical fiber by reducing the divergence angle of the light beam; the ultraviolet optical fiber transmits an ultraviolet signal; the focusing mirror probe focuses an ultraviolet light signal emitted by the ultraviolet optical fiber and couples the ultraviolet light signal to the photoelectric sensor in the ith signal conditioning unit; in the ith signal conditioning unit, the direct-current power supply module directly drives the photoelectric sensor; the filtering module enables the direct current component obtained through photoelectric conversion to pass through, and interference and noise are suppressed; the operational amplifier module amplifies the filtered acquired signal; the voltage comparator converts the filtered acquisition signals into high and low level signals, and the high and low level signals obtained through conversion are converted into real-time voltage digital signals through an ith data acquisition card and transmitted to the data terminal.
5. The grading method based on the intensity grading system of the partial discharge of the electrical equipment according to the claim 1, characterized in that the data terminal counts the pulse number of the real-time voltage digital signal in the step 4 as: a. the1,A2,A3……AN；
In step 4, the weighting calculation is as follows:
according to the volume abc of the model established by the switch cabinet in the step 1 and the probability of partial discharge in the switch cabinet area is equal everywhere, the discharge probability density function expression is as follows:
f＝1/abc
under the condition that the N collimator lens probes in the first optical signal transmission unit to the nth optical signal transmission unit can cover the whole internal area of the switch cabinet, the integral of the probability density function f on the monitored effective space range in the N collimator lens probes is the weighting coefficient of the collimator lens probe:
wherein, ViThe sum of the pulse density weights counted for the whole system is recorded as:
4, arranging the high-voltage partial discharge source in the switch cabinet to simulate partial discharge of the electrical equipment caused by insulation degradation and set partial discharge power Pj，j∈[1,M],M＞0；
In the step 4, the multiple-grade discharge power is set to construct a pulse array matrix as follows: testing under the condition of changing the high-voltage partial discharge power to obtain M groups of statistical pulse array matrixes matrix under different partial discharge source powers:
wherein A isj,i j∈[1,M],i∈[1,N]The pulse number of the ith collimating mirror in the jth group of partial discharge power is set;
processing each row of the matrix yields a weight vector H:
H＝[W1 W2 … Wj … WM]T
wherein, WjThe sum of the pulse density weights of the jth group of partial discharge power;
the intensity of the partial discharge in step 4 is graded as:
mapping of the pulse weighting vector to the partial discharge intensity can be obtained:
wherein, the pulse density weight and W of the j group partial discharge powerjAnd the j group partial discharge power PjCorrespondingly, an partial discharge alarm level R can be established at the data terminal according to the data in the P vector1,R2,R3…RMThe device can realize real-time monitoring of partial discharge of high-voltage equipment running in the switch cabinet due to insulation degradation and give an alarm level.
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| CN109283443B (en) * | 2018-11-15 | 2020-11-17 | 湖北工业大学 | Electrical equipment partial discharge positioning system and method based on ultraviolet light |
| CN110045251B (en) * | 2019-05-05 | 2021-05-18 | 湖北工业大学 | Power cable internal insulation defect detection and flaw detection device and method |
| CN112345992A (en) * | 2020-10-30 | 2021-02-09 | 中国电力科学研究院有限公司 | Calibration method and system for partial discharge composite parameter by pulse current method |
| CN113625136B (en) * | 2021-08-10 | 2023-10-31 | 国网福建省电力有限公司漳州供电公司 | Multi-stage discharge coefficient-based power distribution network 6kV cable aging state evaluation method |
| CN114280435B (en) * | 2021-12-24 | 2023-05-05 | 重庆科技学院 | Partial discharge management system of power system switch cabinet |
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