CN109001604A - A kind of strength grading system and method based on local discharge of electrical equipment - Google Patents
A kind of strength grading system and method based on local discharge of electrical equipment Download PDFInfo
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- CN109001604A CN109001604A CN201811210839.2A CN201811210839A CN109001604A CN 109001604 A CN109001604 A CN 109001604A CN 201811210839 A CN201811210839 A CN 201811210839A CN 109001604 A CN109001604 A CN 109001604A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/1218—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 proposes a kind of strength grading system and method based on local discharge of electrical equipment.Present system includes multiple optical signal transmitting units, multiple signal conditioning units, multiple data collecting cards and data terminal.The method of the present invention establishes three-dimensional system of coordinate using switchgear, length, width and the height of switchgear respectively with the overlapping of axles of three-dimensional system of coordinate；Collimating mirror probe in multiple optical signal transmitting units is divided into multiple groups, and at symmetrically placed state；It is acquired by corresponding optical signal transmitting unit, signal conditioning unit and data collecting card by the converted obtained real-time voltage digital signal of shelf depreciation ultraviolet light radiation and is transmitted to data terminal；The umber of pulse of data terminal statistics real-time voltage digital signal is simultaneously weighted, high pressure partial discharge source is placed in inside switch cabinet and sets multiple grades discharge power building pulse array, the strength grading of shelf depreciation is established by pulse array and multiple grades discharge power.
Description
Technical field
The invention belongs to local discharge of electrical equipment monitoring technical fields, and in particular to one kind is locally put based on electrical equipment
The strength grading system and method for electricity.
Background technique
China's electric system just develops towards extensive, remote, extra-high voltage, intelligence, alternating current-direct current mixing transmission of electricity direction.
The safe operation of electrical equipment is the important leverage of power grid security reliability service, however power equipment is during designing and manufacturing
Existing mass defect, transport and caused mechanical damage in installation process, for a long time in high voltage, strong electrical field and harsh weather ring
Operation in border all becomes the factor of insulation of electrical installation performance decline.It is not unique, but has its counterpart, long-term office small-scale, intensity is slight
Portion's electric discharge is again to lead to the further lowering of main cause of insulation of electrical installation body insulating properties, with time integral, shelf depreciation
Scale, number and intensity are gradually increased, and insulation of electrical installation situation forms the vicious circle of positive feedback formula, finally will lead to entire
Insulation system destroys.Serious insulation fault may threaten worker safety, cause large area blackout, bring economy
Loss.Therefore insulation of electrical installation performance will directly influence electrical equipment safety work.
Partial Discharge Detection is to judge the effective means and appraisal procedure of insulation of electrical installation performance, however for because of equipment
Shelf depreciation caused by decreasing insulating should have a set of effective partial discharge strength grade assessment apparatus insulated to quantify
The power of performance.
Summary of the invention
In view of the above existing problems in the prior art, the present invention provides a kind of intensity based on local discharge of electrical equipment point
Grade system and method.Turn for the ultraviolet band optical signal that hardware components of the invention contain shelf depreciation through photoelectric sensor group
Change basis of the pulse current of output as entire monitoring system.
The technical solution of present system is characterized in that, including the first optical signal transmitting unit ..., N optical signal transmission
Unit, the first signal conditioning unit ..., n-signal conditioning unit, the first data collecting card ..., Nth data capture card, number
According to terminal, N > 0；
First optical signal transmitting unit and first signal conditioning unit pass through the first optical signal transmission list
Focus lamp probe is optically coupled with photoelectric sensor in first signal conditioning unit in member connect；...；The N light
Signal transmission unit and the n-signal conditioning unit pass through focus lamp probe in N optical signal transmitting unit and n-signal tune
Photoelectric sensor is optically coupled connection in reason unit；First signal conditioning unit and the data collecting card pass through conducting wire
Connection；...；The n-signal conditioning unit is connect with the data collecting card by conducting wire；First data collecting card with
The data terminal connection；...；The Nth data capture card is connect with the data terminal；
Preferably, i-th optical signal transmitting unit, which is characterized in that including collimating mirror probe, UV fiber, gather
Burnt mirror probe；The collimating mirror probe is popped one's head in the focus lamp to be connect by the UV fiber, i ∈ [1, N], N > 0.
Preferably, i-th signal conditioning unit, which is characterized in that including photoelectric sensor, DC power supplier,
Filter module, operational amplifier, voltage comparator；The photoelectric sensor, DC power supplier, filter module, operation are put
Big device module, voltage comparator module are sequentially connected in series by conducting wire, i ∈ [1, N], N > 0.
Preferably, the collimating mirror probe is by reducing beam divergence angle in i-th optical signal transmitting unit
Mode reduces the loss for being coupled into UV fiber；The UV fiber is used for the transmission of ultraviolet signal；The focus lamp is visited
Head is focused the optical signal of tail optical fiber outgoing and is coupled to photoelectric sensor in i-th signal conditioning unit.
Preferably, the DC power supplier directly drives photoelectric sensor in i-th signal conditioning unit；
The filter module inhibits interference and noise for making to pass through by the DC component that photoelectric conversion obtains；The operation amplifier
Device module is used to amplify filtered acquisition signal；Filtered acquisition signal is converted to height electricity by the voltage comparator
Ordinary mail number, i ∈ [1, N], N > 0；
Preferably, i-th data collecting card is converted to digital signal, i for converted gained low and high level signal
∈ [1, N], N > 0
Preferably, the data terminal counts the frequency of its rising edge and is denoted as umber of pulse.
The technical solution of the method for the present invention is a kind of strength grading method based on local discharge of electrical equipment, and feature exists
In, comprising the following steps:
Step 1: establishing three-dimensional system of coordinate using switchgear, length, width and the height of switchgear are sat with three-dimensional respectively
Mark the overlapping of axles of system；
Step 2: the collimating mirror probe that N number of optical signal transmitting unit needed for carrying out partial discharge detection has is divided into multiple groups,
And at symmetrically placed state；
Step 3: by the signal conditioning unit that is respectively carried using N optical signal transmitting unit, data collecting card acquisition by
The converted obtained real-time voltage digital signal of shelf depreciation ultraviolet light radiation is simultaneously transmitted to data terminal；
Step 4: the umber of pulse of data terminal statistics real-time voltage digital signal is simultaneously weighted, by high pressure partial discharge source
It is placed in inside switch cabinet and sets multiple grades discharge power building pulse array, by pulse array and multiple
Quality discharges power establishes the strength grading of shelf depreciation；
Preferably, the length of switchgear described in step 1, width and height respectively with the overlapping of axles of three-dimensional system of coordinate
Are as follows:
The length of switchgear is that a is overlapped with reference axis x, and the width of switchgear is that b is overlapped with reference axis y, the height of switchgear
Degree is that c is overlapped with reference axis z；
Preferably, N described in step 2 is even number；
The collimating mirror that N number of optical signal transmitting unit has described in step 2 is divided into N/2 group in pairs；
Symmetrically placed state described in step 2 is built according to switchgear respectively by every group of two collimating mirrors for including probe
The center of area of vertical rectangular body Model, apex angle, rib midpoint are placed in corner；
The collimating mirror probe in each site is denoted as L1,L2,L3……LN；
Preferably, being acquired described in step 3 are as follows: in i-th optical signal transmitting unit, the collimating mirror probe is logical
The mode for crossing reduction beam divergence angle reduces the loss for being coupled into UV fiber；The UV fiber transmits ultraviolet signal；
The focus lamp probe is focused the ultraviolet signal that UV fiber is emitted and is coupled in i-th signal conditioning unit
Photoelectric sensor；In i-th signal conditioning unit, the DC power supplier directly drives photoelectric sensor；The filter
Wave module makes to pass through by the DC component that photoelectric conversion obtains, and inhibits interference and noise；The operational amplifier module will filter
Acquisition signal amplification after wave；Filtered acquisition signal is converted to low and high level signal by the voltage comparator, for warp
Conversion gained low and high level signal, is converted to real-time voltage digital signal by the i-th data collecting card and is transmitted to the data
Terminal；
Preferably, the umber of pulse of the statistics real-time voltage digital signal of data terminal described in step 4 are as follows: A1,A2,
A3……AN；
It is weighted described in step 4 not:
Follow up step 1 described in the established model volume of switchgear be abc, if in switchgear region shelf depreciation probability
It is equal everywhere, then discharge probability density function expression formula are as follows:
F=1/abc
It can cover in N number of collimating mirror probe of first optical signal transmitting unit into N optical signal transmitting unit and entirely open
Under conditions of closing cabinet interior zone, product of the probability density function f to useful space range monitoring in N number of collimating mirror probe
Divide the weighting coefficient of as collimating mirror probe:
Wherein, ViFor i-th of collimating mirror space size that can be detected, therefore the pulse counted for whole system is close
It spends weight and is denoted as:
High pressure partial discharge source is placed in inside switch cabinet simulation electrical equipment because of partial discharge caused by insulation degradation described in step 4
And set partial discharge discharge power Pj, j ∈ [1, M], M > 0；
Setting multiple grades discharge power described in step 4 constructs pulse array are as follows: is changing high pressure partial discharge power
Under conditions of test obtain M group and count pulse array matrix under different partial discharge source power:
Wherein, Aj,iJ ∈ [1, M], i ∈ [1, N] are the umber of pulse of i-th of collimating mirror in jth group partial discharge discharge power；
Weighing vector H is obtained by every a line of above-mentioned weighting scheme processing array:
H=[W1 W2…Wj…WM]T
Wherein, WjThe impulse density weight of jth group partial discharge discharge power and；
The strength grading of shelf depreciation described in step 4 are as follows:
Mapping of the pulse weighing vector to partial discharge intensity can be obtained:
Wherein, the impulse density weight and W of jth group partial discharge discharge powerjWith jth group partial discharge discharge power PjIt is corresponding, according to
Data in P vector can set up partial discharge alert level R in data terminal1,R2,R3…RM, it can be achieved that operating in switchgear
High-tension apparatus because partial discharge caused by insulation degradation real-time monitoring and provide alert level.
The beneficial effects of the present invention are:
Optical passive component group according to the present invention good noiseproof feature and use under hyperbaric environment with it
To the characteristic that the device of ultraviolet band response interferes system real-time detection to avoid atmospheric optical spec, the reliable of system is improved
Property.
The present invention, which greatly reduces the process that UV energy entrained by shelf depreciation is converted to signal pulse, to be passed through
Shelf depreciation carries out Direct Power measurement or luminous intensity measurement to assess the difficulty of strength of discharge method.
The present invention handles the weighting of pulse, and the calibration process of pulse weight and partial discharge power finally can be to because of insulating properties
Reducing causes apparatus local discharge to carry out effective reference that grade is evaluated as current device situation.
Detailed description of the invention
Fig. 1: present system structural block diagram；
Fig. 2: the method for the present invention flow chart.
Specific embodiment
Understand for the ease of those of ordinary skill in the art and implement the present invention, with reference to the accompanying drawings and embodiments to this hair
It is bright to be described in further detail, it should be understood that implementation example described herein is merely to illustrate and explain the present invention, not
For limiting the present invention.
Fig. 1 is present system entirety topological diagram.The technical solution of hardware components embodiment of the present invention includes the first light
Signal transmission unit ..., N optical signal transmitting unit, the first signal conditioning unit ..., n-signal conditioning unit, first
Data collecting card ..., Nth data capture card, data terminal, N > 0；First optical signal transmitting unit and first letter
Number conditioning unit by photoelectric sensor in focus lamp probe segment in the first optical signal cell and the first signal conditioning unit into
The connection of row optical coupling；...；The N optical signal transmitting unit and the n-signal conditioning unit pass through the first optical signal list
Focus lamp probe segment is optically coupled with photoelectric sensor in the first signal conditioning unit and connect in member；The first signal tune
Reason unit is connect with first data collecting card by conducting wire；...；The n-signal conditioning unit is adopted with the Nth data
Truck is connected by conducting wire；The data collecting card is connect with the data terminal；I-th optical signal transmitting unit, it is special
Sign is, including collimating mirror probe, UV fiber, focus lamp probe；The collimating mirror probe, focus lamp probe are described ultraviolet
Optical fiber both ends are connected by special interface, i ∈ [1, N], N > 0；I-th signal conditioning unit, which is characterized in that including light
Electric transducer, DC power supplier, filter module, operational amplifier, voltage comparator；The photoelectric sensor, direct current
Source module, filter module, operational amplifier module, voltage comparator module are sequentially connected in series by conducting wire, i ∈ [1, N], N
> 0, N=12.
In i-th optical signal transmitting unit, the collimating mirror probe is reduced by way of reducing beam divergence angle
It is coupled into the loss of UV fiber；The UV fiber is used for the transmission of ultraviolet signal；The focus lamp probe is to tail optical fiber
The optical signal of outgoing is focused and is coupled to photoelectric sensor in i-th signal conditioning unit.
In i-th signal conditioning unit, the DC power supplier directly drives photoelectric sensor；The filtering mould
Block inhibits interference and noise for making to pass through by the DC component that photoelectric conversion obtains；The operational amplifier module is used for
Filtered acquisition signal is amplified；Filtered acquisition signal is converted to low and high level signal, i ∈ by the voltage comparator
[1, N], N > 0 count the frequency of its rising edge and are denoted as umber of pulse for converted gained low and high level signal, N=12.
Collimating mirror probe W-75UV, UV fiber XSR600-3.0, focus lamp probe 75X-UV, photoelectric sensor R2868,
DC power supplier AN50805, filter module PLP-600, operational amplifier RS521SXK, voltage comparator lm393, data are adopted
Truck USB3200 and data terminal PC；N=12, M=20.
The technical solution of the method for the present invention is a kind of strength grading side based on ultraviolet light detection local discharge of electrical equipment
Method, which comprises the following steps:
Step 1: establishing three-dimensional system of coordinate using switchgear, length, width and the height of switchgear are sat with three-dimensional respectively
Mark the overlapping of axles of system；
Preferably, the length of switchgear described in step 1, width and height respectively with the overlapping of axles of three-dimensional system of coordinate
Are as follows:
The length of switchgear is that a is overlapped with reference axis x, and the width of switchgear is that b is overlapped with reference axis y, the height of switchgear
Degree is that c is overlapped with reference axis z；
Step 2: the collimating mirror probe that N=12 optical signal transmitting unit needed for carrying out partial discharge detection has is divided into more
Group, and at symmetrically placed state；
Preferably, N=12 described in step 2 is even number；
The collimating mirror that N=12 optical signal transmitting unit has described in step 2 is divided into N/2 group in pairs；
Symmetrically placed state described in step 2 is built according to switchgear respectively by every group of two collimating mirrors for including probe
The center of area of vertical rectangular body Model, apex angle, rib midpoint are placed in corner；
The collimating mirror probe in each site is denoted as L1,L2,L3……LN；
Step 3: being adopted by the signal conditioning unit that is respectively carried using N=12 optical signal transmitting unit, data collecting card
Collection is by the converted obtained real-time voltage digital signal of shelf depreciation ultraviolet light radiation and is transmitted to data terminal；
It is acquired described in step 3 are as follows: in i-th optical signal transmitting unit, the collimating mirror probe is by reducing light
The mode of beam divergence angle reduces the loss for being coupled into UV fiber；The UV fiber transmits ultraviolet signal；The focusing
Mirror probe is focused the ultraviolet signal that UV fiber is emitted and is coupled to photoelectric transfer in i-th signal conditioning unit
Sensor；In i-th signal conditioning unit, the DC power supplier directly drives photoelectric sensor；The filter module
Make to pass through by the DC component that photoelectric conversion obtains, inhibits interference and noise；The operational amplifier module will be filtered
Acquire signal amplification；Filtered acquisition signal is converted to low and high level signal by the voltage comparator, for converted institute
Low and high level signal is obtained, real-time voltage digital signal is converted to by the i-th data collecting card and is transmitted to the data terminal；
Step 4: the umber of pulse of data terminal statistics real-time voltage digital signal is simultaneously weighted, by high pressure partial discharge source
It is placed in inside switch cabinet and sets multiple grades discharge power building pulse array, by pulse array and multiple
Quality discharges power establishes the strength grading of shelf depreciation；
Preferably, the umber of pulse of the statistics real-time voltage digital signal of data terminal described in step 4 are as follows: A1,A2,
A3……AN；
It is weighted described in step 4 not:
Follow up step 1 described in the established model volume of switchgear be abc, if in switchgear region shelf depreciation probability
It is equal everywhere, then discharge probability density function expression formula are as follows:
F=1/abc
It can be covered in N=12 collimating mirror probe of first optical signal transmitting unit into N=12 optical signal transmitting unit
It covers under conditions of entire inside switch cabinet region, probability density function f is to monitoring effective in N=12 collimating mirror probe
The integral of spatial dimension is the weighting coefficient of collimating mirror probe:
Wherein, ViFor i-th of collimating mirror space size that can be detected, therefore the pulse counted for whole system is close
It spends weight and is denoted as:
High pressure partial discharge source is placed in inside switch cabinet simulation electrical equipment because of partial discharge caused by insulation degradation described in step 4
And set partial discharge discharge power Pj, M=20, j ∈ [1, M], M > 0；
Setting multiple grades discharge power described in step 4 constructs pulse array are as follows: is changing high pressure partial discharge power
Under conditions of test obtain M=20 group and count pulse array matrix under different partial discharge source power:
Wherein, Aj,iJ ∈ [1, M], i ∈ [1, N] are the umber of pulse of i-th of collimating mirror in jth group partial discharge discharge power, N
=12, M=20；
Weighing vector H is obtained by every a line of above-mentioned weighting scheme processing array:
H=[W1 W2…Wj…WM]T
Wherein, WjThe impulse density weight of jth group partial discharge discharge power and；
The strength grading of shelf depreciation described in step 4 are as follows:
Mapping of the pulse weighing vector to partial discharge intensity can be obtained:
Wherein, the impulse density weight and W of jth group partial discharge discharge powerjWith jth group partial discharge discharge power PjIt is corresponding, according to
Data in P vector can set up partial discharge alert level R in data terminal1,R2,R3…RM, it can be achieved that operating in switchgear
High-tension apparatus because partial discharge caused by insulation degradation real-time monitoring and provide alert level.
Claims (8)
1. a kind of strength grading system based on local discharge of electrical equipment, characterized by comprising: the first optical signal transmission list
Member ..., N optical signal transmitting unit, the first signal conditioning unit ..., n-signal conditioning unit, the first data acquisition
Card ..., Nth data capture card, data terminal, N > 0 and N are positive integer；
First optical signal transmitting unit and first signal conditioning unit pass through in first optical signal transmitting unit
Focus lamp probe is optically coupled with photoelectric sensor in first signal conditioning unit to be connect；...；The N optical signal
Transmission unit and the n-signal conditioning unit are single by focus lamp probe in N optical signal transmitting unit and n-signal conditioning
Photoelectric sensor is optically coupled connection in member；First signal conditioning unit and the data collecting card are connected by conducting wire
It connects；...；The n-signal conditioning unit is connect with the data collecting card by conducting wire；First data collecting card and institute
State data terminal connection；...；The Nth data capture card is connect with the data terminal；
I-th optical signal transmitting unit is made of collimating mirror probe, UV fiber, focus lamp probe；The collimating mirror probe
It pops one's head in the focus lamp and is connect by the UV fiber；I-th signal conditioning unit, by photoelectric sensor, direct current
Source module, filter module, operational amplifier, voltage comparator are constituted, the photoelectric sensor, DC power supplier, filtering
Module, operational amplifier module, voltage comparator module are sequentially connected in series by conducting wire, and i ∈ [1, N], N > 0 and N are positive whole
Number.
I-th optical signal transmitting unit is used to local discharge signal being converted to ultraviolet signal, the i-th signal condition list
Member is for being converted to low and high level signal for ultraviolet signal；I-th data collecting card is for converted gained low and high level
Signal is converted to digital signal, and the data terminal counts the frequency of its rising edge and is denoted as umber of pulse, i ∈ [1, N], N > 0 and
N is positive integer.
2. the strength grading system according to claim 1 based on local discharge of electrical equipment, it is characterised in that: the standard
Straight mirror probe reduces the loss for being coupled into UV fiber by way of reducing beam divergence angle；The UV fiber is for purple
The transmission of outer optical signal；The focus lamp probe is focused the optical signal that tail optical fiber is emitted and is coupled to the i-th signal tune
Photoelectric sensor in unit is managed, i ∈ [1, N], N > 0 and N are positive integer.
3. the strength grading system according to claim 1 based on local discharge of electrical equipment, it is characterised in that: described straight
Galvanic electricity source module directly drives photoelectric sensor；The filter module is for keeping the DC component obtained by photoelectric conversion logical
It crosses, inhibits interference and noise；The operational amplifier module is used to amplify filtered acquisition signal；The voltage comparator
Filtered acquisition signal is converted into low and high level signal, i ∈ [1, N], N > 0 and N are positive integer.
4. a kind of strength grading system using described in claim 1 based on local discharge of electrical equipment carries out being based on electrically setting
The strength grading method of standby shelf depreciation, which comprises the following steps:
Step 1: establish three-dimensional system of coordinate using switchgear, length, width and the height of switchgear respectively with three-dimensional system of coordinate
Overlapping of axles；
Step 2: the collimating mirror that N number of optical signal transmitting unit needed for carrying out partial discharge detection has, which is popped one's head in, is divided into multiple groups, and at
Symmetrically placed state；
Step 3: being acquired by the signal conditioning unit that is respectively carried using N optical signal transmitting unit, data collecting card by part
The converted obtained real-time voltage digital signal of electric discharge ultraviolet light radiation is simultaneously transmitted to data terminal；
Step 4: the umber of pulse of data terminal statistics real-time voltage digital signal is simultaneously weighted, and high pressure partial discharge source is placed in
Inside switch cabinet simultaneously sets multiple grades discharge power building pulse array, passes through pulse array and multiple grades
Discharge power establishes the strength grading of shelf depreciation.
5. according to the strength grading method as claimed in claim 4 based on local discharge of electrical equipment is utilized, which is characterized in that step
The length of switchgear described in rapid 1, width and height respectively with the overlapping of axles of three-dimensional system of coordinate are as follows:
The length of switchgear is that a is overlapped with reference axis x, and the width of switchgear is that b is overlapped with reference axis y, and the height of switchgear is c
It is overlapped with reference axis z.
6. according to the strength grading method as claimed in claim 4 based on local discharge of electrical equipment is utilized, which is characterized in that step
N described in rapid 2 is even number；
The collimating mirror that N number of optical signal transmitting unit has described in step 2 is divided into N/2 group in pairs；
Symmetrically placed state described in step 2 is established according to switchgear respectively by every group of two collimating mirrors for including probe
The center of area of rectangular body Model, apex angle, rib midpoint are placed in corner；
The collimating mirror probe in each site is denoted as L1,L2,L3……LN。
7. according to the strength grading method as claimed in claim 4 based on local discharge of electrical equipment is utilized, which is characterized in that step
It is acquired described in rapid 3 are as follows: in i-th optical signal transmitting unit, the collimating mirror probe is by reducing beam divergence angle
Mode reduces the loss for being coupled into UV fiber；The UV fiber transmits ultraviolet signal；The focus lamp probe is to purple
The ultraviolet signal of infrared optical fiber outgoing is focused and is coupled to photoelectric sensor in i-th signal conditioning unit；Described
In i-th signal conditioning unit, the DC power supplier directly drives photoelectric sensor；The filter module makes to turn by photoelectricity
The DC component got in return passes through, and inhibits interference and noise；The operational amplifier module amplifies filtered acquisition signal；
Filtered acquisition signal is converted to low and high level signal by the voltage comparator, and converted gained low and high level is believed
Number, real-time voltage digital signal is converted to by the i-th data collecting card and is transmitted to the data terminal.
8. according to the strength grading method as claimed in claim 4 based on local discharge of electrical equipment is utilized, which is characterized in that step
The umber of pulse of the statistics real-time voltage digital signal of data terminal described in rapid 4 are as follows: A1,A2,A3……AN；
It is weighted described in step 4 not:
The established model volume of switchgear described in the step 1 that follows up is abc, if the probability of shelf depreciation is everywhere in switchgear region
It is equal, then discharge probability density function expression formula are as follows:
F=1/abc
Entire switchgear can be covered in N number of collimating mirror probe of first optical signal transmitting unit into N optical signal transmitting unit
Under conditions of interior zone, probability density function f is to the integral of useful space range monitoring in N number of collimating mirror probe
The weighting coefficient popped one's head in for the collimating mirror:
Wherein, ViFor i-th of collimating mirror space size that can be detected, therefore the impulse density counted for whole system is weighed
It is worth and is denoted as:
High pressure partial discharge source is placed in inside switch cabinet simulation electrical equipment because of partial discharge caused by insulation degradation described in step 4 and is set
Foregone conclusion puts discharge power Pj, j ∈ [1, M], M > 0；
Setting multiple grades discharge power described in step 4 constructs pulse array are as follows: in the item for changing high pressure partial discharge power
Test obtains M group and counts pulse array matrix under different partial discharge source power under part:
Wherein, Aj,iJ ∈ [1, M], i ∈ [1, N] are the umber of pulse of i-th of collimating mirror in jth group partial discharge discharge power；
Weighing vector H is obtained by every a line of above-mentioned weighting scheme processing array:
H=[W1 W2 … Wj … WM]T
Wherein, WjThe impulse density weight of jth group partial discharge discharge power and；
The strength grading of shelf depreciation described in step 4 are as follows:
Mapping of the pulse weighing vector to partial discharge intensity can be obtained:
Wherein, the impulse density weight and W of jth group partial discharge discharge powerjWith jth group partial discharge discharge power PjIt is corresponding, according to P to
Data in amount can set up partial discharge alert level R in data terminal1,R2,R3…RM, it can be achieved that the height operated in switchgear
Pressure equipment because partial discharge caused by insulation degradation real-time monitoring and provide alert level.
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| CN201811210839.2A CN109001604B (en) | 2018-10-17 | 2018-10-17 | Intensity grading system and method based on partial discharge of electrical equipment |
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| CN201811210839.2A CN109001604B (en) | 2018-10-17 | 2018-10-17 | Intensity grading system and method based on partial discharge of electrical equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283443A (en) * | 2018-11-15 | 2019-01-29 | 湖北工业大学 | A kind of local discharge of electrical equipment positioning system and method based on ultraviolet light |
| CN110045251A (en) * | 2019-05-05 | 2019-07-23 | 湖北工业大学 | A kind of power cable built-in electrical insulation defects detection and failure detector 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 |
| CN113625136A (en) * | 2021-08-10 | 2021-11-09 | 国网福建省电力有限公司漳州供电公司 | Power distribution network 6kV cable aging state evaluation method based on multi-stage discharge coefficients |
| CN114280435A (en) * | 2021-12-24 | 2022-04-05 | 重庆科技学院 | Partial discharge management system of power system switch cabinet |
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| CN113625136A (en) * | 2021-08-10 | 2021-11-09 | 国网福建省电力有限公司漳州供电公司 | Power distribution network 6kV cable aging state evaluation method based on multi-stage discharge coefficients |
| 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 |
| CN114280435A (en) * | 2021-12-24 | 2022-04-05 | 重庆科技学院 | Partial discharge management system of power system switch cabinet |
| 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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