CN107991593A - A kind of noise and shelf depreciation positioning GIS state of insulation on-line monitoring systems - Google Patents
A kind of noise and shelf depreciation positioning GIS state of insulation on-line monitoring systems Download PDFInfo
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- CN107991593A CN107991593A CN201711281550.5A CN201711281550A CN107991593A CN 107991593 A CN107991593 A CN 107991593A CN 201711281550 A CN201711281550 A CN 201711281550A CN 107991593 A CN107991593 A CN 107991593A
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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
- G01R31/1227—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
- G01R31/1254—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 of gas-insulated power appliances or vacuum gaps
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- Locating Faults (AREA)
Abstract
The present invention relates to a kind of noise and shelf depreciation positioning GIS state of insulation on-line monitoring systems, including being respectively arranged at A phase lines, the first sensor unit at place's disc insulator that B phase lines are connected with GIS compartments in C phase lines with busbar, second sensor unit and 3rd sensor unit, it is respectively arranged at A phase lines, B phase lines and the 4th sensor unit at the feeder line gas chamber disc insulator of GIS compartments in C phase lines, 5th sensor unit and the 6th sensor unit, through connection cables respectively with first sensor unit, second sensor unit, 3rd sensor unit, 4th sensor unit, the multi-channel electronic switch unit of 5th sensor unit and the 6th sensor unit, and the monitoring host being connected through connection cables with multi-channel electronic switch unit.The present invention realizes GIS partial discharge on-line monitoring function, and with unique antinoise and PD Online positioning function.
Description
Technical field
The present invention relates to a kind of noise and shelf depreciation positioning GIS state of insulation on-line monitoring systems.
Background technology
GIS substations are typically the hub node of power transmission network, its security is most important to the reliability service of power grid.With
The development of intelligent grid construction in recent years, the GIS insulation state monitorings system based on hyperfrequency (UHF) monitoring technology is
Progressively set up in electric power enterprise, achieve significant results.
Practice in recent years finds that existing method there are several significant shortcomings and limitations, restricts this technology in life
Application effect in production, is mainly manifested in three aspects：1) in the case that scene interference is big, existing monitoring device is difficult to effectively
Identification interference and shelf depreciation, fail to judge, judge by accident and happen occasionally；2) sensor arrangement point is more, and test system overall cost is high；3) survey
The overall signal measurement of test system is slow with processing speed, it is impossible to the specific location that tuning on-line shelf depreciation occurs, operation maintenance personnel
It is difficult to efficiently make the decision-making that GIS device continued to run with or had a power failure processing in time.
Current on-line monitoring system both domestic and external is using multiple sensing unit multiple spots arrangement, the side of sensor internal detection
Case, multi-channel data are complicated without any correlation analysis, system structure；
Domestic and international on-line monitoring system does not have the function of tuning on-line partial discharge at present, and common way is to monitor
To after suspicious discharge signal, staff reuses oscillograph and carries out livewire work to scene, manually carries out partial discharge location, consumes
When, effort.Even the powered positioning in scene, the level external trigger mode of generally use oscillograph, oscillograph can be frequently outside
Noise false triggering, it is impossible to ensure to capture partial discharge, the efficiency for positioning work is also very low.
However, the position of positioning defect is all very for efficiently carrying out GIS maintenances and assessment partial discharge danger in time
Important, the system with this is also that industry is expected for many years, but never good system architecture and signal
Processing method.
The anti-interference of current on-line monitoring system both domestic and external is by so-called collection of illustrative plates and neural fusion, practice
Show that the effect of this method is very limited.
In view of the above circumstances, existing UHF measurement technology is lifted, is developed with online shelf depreciation positioning function, energy
Noise and the GIS on-line monitorings and diagnostic platform of shelf depreciation are accurately identified under strong interference environment, meets the length of on-line monitoring
The requirement that time continuity and more GIS intervals measure at the same time, also have concurrently it is removable, be easily installed and using it is economical the advantages that, be
Current and very important problem and developing direction in the exploitation and application of GIS state of insulations measuring technology from now on.
The content of the invention
It is an object of the invention to provide a kind of noise and shelf depreciation to position GIS state of insulation on-line monitoring systems, with
Overcome defect existing in the prior art.
To achieve the above object, the technical scheme is that：A kind of noise and shelf depreciation positioning GIS state of insulations exist
Line monitoring system, including it is respectively arranged at A phase lines, place's benzvalene form that B phase lines are connected with GIS compartments in C phase lines with busbar
At insulator and it is used for the first sensor unit, second sensor unit and 3rd sensor unit for detecting GIS pulses, point
It is not arranged in A phase lines, B phase lines and C phase lines at the feeder line gas chamber disc insulator of GIS compartments and for detecting GIS
The 4th sensor unit, the 5th sensor unit and the 6th sensor unit of pulse, through connection cables respectively with described
One sensor unit, second sensor unit, 3rd sensor unit, the 4th sensor unit, the 5th sensor unit and
The multi-channel electronic switch unit of 6th sensor unit, and the prison being connected through connection cables with the multi-channel electronic switch unit
Survey host.
In an embodiment of the present invention, the first sensor unit, second sensor unit, 3rd sensor unit,
4th sensor unit, the 5th sensor unit and the 6th sensor unit use the active uhf sensor of external.
In an embodiment of the present invention, the active uhf sensor of the external includes a cylindrical shell body, sets
Coaxial connector output interface in cylindrical shell body one end, the pickoff electrode for being arranged at the cylindrical shell body other end and
Signal conditioning circuit, voltage conversion circuit and the electric cable connection circuit being arranged in cylinder case body；It is the pickoff electrode, described
Signal conditioning circuit, the voltage conversion circuit are sequentially connected, and are connected to the coaxial connector output interface.
In an embodiment of the present invention, the pickoff electrode includes two covering of the fans using butterfly symmetrical structure, and covering of the fan
Electromagnetic wave signal wavelength of the size with frequency in the range of 300MHz to 3GHz matches.
In an embodiment of the present invention, the monitoring host includes a host housing, is arranged at adopting in the host housing
Collector, FPGA, memory, microprocessor, and it is arranged at the display screen of host housing upper surface；The FPGA, described adopt
Collector, the memory and the display screen are connected with the microprocessor；The Acquisition Circuit is configured in described
The coaxial connector output interface of host housing and the connection cables are connected to the multi-channel electronic switch unit.
In an embodiment of the present invention, the microprocessor carries GIS partial discharge on-line monitoring module and shelf depreciation
Locating module；The GIS partial discharge on-line monitoring module exports measurement data by the display screen；The shelf depreciation
Locating module includes both-end partial discharge pulse matching unit and both-end partial discharge pulse positioning using TDOA unit.
In an embodiment of the present invention, both-end partial discharge pulse matching unit is by calculating both-end shelf depreciation arteries and veins
Rush the time difference, and when the both-end partial discharge pulse time difference is less than the maximum time difference propagated in whole GIS of electric signal, then
For matching pulse；The both-end partial discharge pulse positioning using TDOA unit reaches first and last measurement end by calculating the matching pulse
Time difference, obtains the distance of Partial Discharge Sources and measurement end.
In an embodiment of the present invention, calculated in the following way the time difference per phase both-end partial discharge pulse：
Note first sensor any sensor into 3rd sensor measure m pulse, according to gomma be 1,2 ...,
I ..., m, and remember that i-th of pulse corresponding time is ti；4th sensor any sensor into the 6th sensor measures
N pulse, according to gomma for 1,2 ..., j ..., n, and remember the corresponding time t of j-th of pulsej；
The then time difference：
Tij=ti-tj (1)
Wherein, i is any integer between 1 and n；J is any integer between 1 and m；Mn time difference is always obtained；
After two sensors on per phase complete installation, the distance between its L is known；Shelf depreciation is in two sensors
Between the value that is also to determine of the maximum time difference T that propagates, and：
Wherein, L is the geometric distance between every two sensors of phase；V is spread speed of the electromagnetic wave in GIS；
The mn time difference T that will be obtainedijAccording to size sequential on number axis, and by time difference sequence in whole number axis
It is divided into three sections (- ∞ ,-T), [- T ,+T], (+T ,+∞)；Expressed with inequality, in the section of both sides, TijMeet
Following formula (3)；In middle section, TijMeet following formula (4)：
|Tij| ＞ T (3)
|Tij|≤T (4)
The pulse of formula (3) will be met as noise；It will meet the pulse of formula (4) as shelf depreciation, and according to such as lower section
Formula is positioned：
The relative position x of shelf depreciation:
In an embodiment of the present invention, the connection cables carry the signal cable of coaxial connector for both-end.
Compared to the prior art, the invention has the advantages that：
1st, the present invention tests measurement sensor unit by using active ultrahigh frequency partial discharge, improves Partial Discharge Detection
Sensitivity, extends the monitoring range of shelf depreciation, provides technical support to reduce the number of monitoring point, it is ensured that whole system
The economy of system application.Using brand-new system structure：Turn only with two high sensitivity wide range sensing units, 1 multichannel
Switch, 1 two passage high speed sampling circuit are changed, system structure is simple；
2nd, the present invention directly samples and have recorded the raw information of shelf depreciation by using high frequency, high-speed sampling method,
Solve the problems, such as in existing envelope and frequency reducing test method lose partial discharge pulse between time difference information, realize office
The tuning on-line of portion's electric discharge.
3rd, the present invention reduces the quantity of high speed sampling circuit and passage, into one by using multi-channel electronic switch technology
Step ensure that the economy of whole system application.
4th, the present invention samples mechanism by using the triggering of outer power frequency reference signal control, solves high frequency, high-speed sampling
The problem of system is by noise signal false triggering, while also ensure that the sampling of shelf depreciation raw information and note in whole power frequency period
The integrality of record.By DISCHARGE PULSES EXTRACTION and pairing, the positioning of partial discharge is not only realized, but also has screened shelf depreciation at the same time with making an uproar
Sound, enables the lifting of the noise resisting ability essence of system.
5th, using phase controlling drainage pattern, with reference to unique DISCHARGE PULSES EXTRACTION, establish and fully rely on two channel datas
Between time domain strong correlation, by asking for the time difference between pulse pair, and analyse in depth time difference sequence, carry out partial discharge and
The identification of noise, and and then complete partial discharge positioning.This is straightforward, completely without relying on complicated pre-training neutral net side
Method, is directly realized two big Core Feature of GIS partial discharge tuning on-line and antinoise, significant effect.It has been completely free of sampling
The external trigger of system, also solves the difficulty of the frequent false triggering of noise faced when partial discharge location is carried out in scene with oscillograph at present
Topic.
6th, the GIS partial discharge on-line monitoring and position system device in the present invention, has a modular construction, small,
Low cost, solves the problems, such as antinoise and partial discharge location that current industry generally faces, for current and GIS state of insulations from now on
The research of measuring technology and it is of great significance in the popularization and application of the enterprises such as electric power, oil, chemical industry, nonferrous metallurgy.
Brief description of the drawings
Fig. 1 is that a kind of GIS state of insulations with noise resisting ability and shelf depreciation positioning function are supervised online in the present invention
The monolithically fabricated figure of examining system.
Fig. 2 is sensor unit pickoff electrode structure chart in one embodiment of the invention.
Fig. 3 is sensor unit signal modulate circuit schematic diagram in one embodiment of the invention.
Fig. 4 is a kind of GIS partial discharge on-line monitoring and positioning system with noise resisting ability in one embodiment of the invention
System is used for the schematic diagram that GIS insulation state monitorings are carried out at scene.
Fig. 5 (a) is that A phases 31 measure the data obtained (pulse voltage) schematic diagram in one embodiment of the invention.
Fig. 5 (b) is that A phases 34 measure the data obtained (pulse voltage) schematic diagram in one embodiment of the invention.
Fig. 6 is that shelf depreciation positions schematic diagram in one embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawings, technical scheme is specifically described.
The present invention provides a kind of GIS state of insulations on-line monitoring system with noise resisting ability and shelf depreciation positioning function
System, as shown in Figure 1, including：Sensor unit 11, sensor unit 12, sensor unit 13, multi-channel electronic switch 14, monitoring
Host 15, sensor unit 16, sensor unit 17, sensor unit 18, connection cables 19 are formed.Sensor unit is installed in
It is connected on GIS insulators by connection cables with multi-channel electronic switch, multi-channel electronic switch passes through connection cables and monitoring host
It is connected, GIS partial discharge monitoring of software is monitoring the display screen of host after sensor measurement data is handled with positioning software
Middle output result.
Further, in the present embodiment, sensor unit is the active uhf sensor of external, is had more highly sensitive
Sensor is installed at GIS device insulator by degree, when measurement, for measuring the frequency given off when shelf depreciation occurs for GIS
Scope is the electromagnetic wave of 300MHz-3GHz.The active uhf sensor of external, by pickoff electrode, signal conditioning circuit, voltage
Conversion circuit, cable connectors and shell composition.Shell is cylinder made of epoxide resin material, internal diameter 130mm, outside diameter
135mm, high 20mm, top are equipped with output interface, and bottom is equipped with pickoff electrode.
Further, as shown in Fig. 2, pickoff electrode uses butterfly symmetrical structure, covering of the fan size is with frequency in 300MHz-
Electromagnetic wave signal wavelength in the range of 3GHz matches.Fan angle α is 50 degree, and fan-shaped vertex distance l1 is 120mm.
Further, signal conditioning circuit, as shown in figure 3, by input signal after two stage power amplification and bandpass filtering
Output, noise jamming is filtered out while improving sensitivity.Signal conditioning circuit by two pieces of power amplifier chips, 5 capacitances, 3
The 5V power supply units composition of inductance, 6 inductance and 3 isolation.
Further, electromagnetic wave signal, is converted to the voltage signal of 0-5V by voltage conversion circuit.
Further, in the present embodiment, multi-channel electronic switch, it is defeated by 2 passages after 6 sensor signals are matched
Go out, measured while realizing 3 phase GIS.A shell is also equipped with, shell is cuboid made of epoxide resin material, a length of
150mm, wide 150mm, high 50mm, 6 Data Input Interfaces, 2 output interfaces and 1 control interface.
Further, in the present embodiment, host is monitored by high speed acquisition circuit, FPGA, high-speed memory, microprocessor
Device, display screen and host housing composition.High speed acquisition circuit, sample frequency can reach 5GHz.High-speed memory, storage are empty
Between capacity be 1G, storage speed reaches as high as 1GB/s.Microprocessor, is equipped with GIS partial discharge on-line monitoring module and part
Breakdown location module, control FPGA carry out supercomputing.Display screen is 4.5 cun of tangible display screens, has HDMI HD videos
Input port.The hollow cuboid that host housing is ABS engineering plastic materials is monitored, a length of 200mm, width 50mm are a height of
140mm, wall thickness are all 5mm.
Further, measurement data is output in display screen by partial discharge monitoring module, and data are saved as two
Binary file.Shelf depreciation locating module, when main body is by both-end partial discharge pulse matching unit and both-end partial discharge pulse
Poor positioning degree composition, and positioning result can be output in display screen.
Further, both-end partial discharge pulse matching unit is by calculating the both-end partial discharge pulse time difference, if
The time that time difference is less than electric signal through whole GIS is then matching pulse.
Further, both-end partial discharge pulse positioning using TDOA unit reaches the first and last measurement end time using matching pulse
Difference, calculates the distance of Partial Discharge Sources and measurement end.
Further, in the present embodiment, connection cables carry the signal cable of BNC-50KF coaxial connectors for both-end.
The interface being connected with connection cables uses BNC-50KF coaxial connectors.
In order to allow those skilled in the art to further appreciate that technical solution proposed by the present invention, with reference to specific embodiment
Illustrate.
The hardware layout of whole system is as shown in Figure 4.Sensor 31,32,33 is installed on the place that GIS compartments are connected with busbar
At disc insulator (each one of A, B, C three-phase), sensor 34,35,36 is installed on the feeder line gas chamber disc insulator of GIS compartments
Locate (each one of A, B, C three-phase), under the control of monitoring host, multipath conversion electronic switch 37 is respectively turned on three groups of sensors, A
The 31 of phase and the 32 of 34, B phase and 35, the 33 of C phases and 36,1 complete power frequency period (20ms) is persistently sampled after connecting every time,
The test data of three-phase is stored entirely in monitoring host 38.
By further carrying out signal analysis to the data in monitoring host 38, you can the positioning and noise for realizing partial discharge are known
Not.The process includes following 3 committed steps：
Step 1：The calculating of time difference between partial discharge pulse
With reference to figure 5, with A phase examples, Fig. 5 a and 5b were respectively illustrated in multiple cycles that 31 and 34 two sensors measure
Monitoring data.31 sensors measure m pulse altogether, according to gomma for 311,312 ..., 31i ..., 31m, mark
The 31i pulse corresponding time is t31i.34 sensors measure n pulse altogether, according to gomma for 341,342 ...,
34j ..., 34n, the 34j pulse of mark corresponding time is t31j。
The time corresponding to any pulse j in any the pulse i and 34 sensors in 31 sensors is taken, when can obtain
Between it is poor
Tij=t31i-t34j (1)
Wherein, i is any integer between 1 and n；J is any integer between 1 and m.Therefore, mn can be obtained altogether
A time difference.
Step 2：The interval division of time difference sequence
Consider such a fact：Two sensors once install, what position was to determine, the distance between they L
It is and known.So, as a kind of electromagnetic wave, the maximum time difference T propagated between two sensors is also to determine partial discharge
Value：
Wherein, L is the geometric distance between two sensors；V is spread speed of the electromagnetic wave in GIS, and known
Constant.
To the mn time difference T obtained in above step 1ijAccording to size sequential, these time difference sequences on number axis
It is listed in whole number axis and is divided into three sections (- ∞ ,-T), [- T ,+T], (+T ,+∞).Expressed with inequality, in both sides
Section, TijMeet (3)；In middle section, TijMeet (4)：
|Tij| ＞ T (3)
|Tij|≤T (4)
Step 3：The positioning of Noise Identification and shelf depreciation
Understanding the physical significance of (3) and (4) is：Meet the pulse pair of inequality (3), occur between sensor 31 and 34
The two side areas of GIS cavitys, and meet the pulse pair of inequality (4), occur in the GIS cavitys between sensor 31 and 34
Portion.
Step 31：Noise Identification
Noise can be directly used as by meeting the pulse of (3).
Step 32：Partial discharge location
Meet that the pulse of (4) to being considered as shelf depreciation, positions it.As shown in fig. 6, using 31 sensors as reference bit
Put, the relative position x of shelf depreciation can be obtained,
Wherein, L is the geometric distance between two sensors 31 and 34, is known constant；V is electromagnetic wave in GIS
Spread speed, be known constant.
In the present embodiment, by the extraction of pulse in the mass data to high speed acquisition in some cycles and this is matched
Technology, not only realizes the positioning of partial discharge this critical function, but also has screened shelf depreciation and noise at the same time, makes the anti-of system
Noise immune is able to the lifting of essence.
Above is presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, caused function are made
During with scope without departing from technical solution of the present invention, protection scope of the present invention is belonged to.
Claims (9)
1. a kind of noise and shelf depreciation positioning GIS state of insulation on-line monitoring systems, it is characterised in that including being respectively arranged at
At place's disc insulator that A phase lines, B phase lines are connected with GIS compartments in C phase lines with busbar and for detecting GIS pulses
First sensor unit, second sensor unit and 3rd sensor unit, be respectively arranged at A phase lines, B phase lines with
In C phase lines at the feeder line gas chamber disc insulator of GIS compartments and for detect GIS pulses the 4th sensor unit, the 5th
Sensor unit and the 6th sensor unit, through connection cables respectively with the first sensor unit, second sensor list
The multichannel electronic of member, 3rd sensor unit, the 4th sensor unit, the 5th sensor unit and the 6th sensor unit is opened
Close unit, and the monitoring host being connected through connection cables with the multi-channel electronic switch unit.
2. a kind of noise according to claim 1 and shelf depreciation positioning GIS state of insulation on-line monitoring systems, its feature
It is, the first sensor unit, second sensor unit, 3rd sensor unit, the 4th sensor unit, the 5th sensing
Device unit and the 6th sensor unit use the active uhf sensor of external.
3. a kind of noise according to claim 2 and shelf depreciation positioning GIS state of insulation on-line monitoring systems, its feature
It is, the active uhf sensor of external includes a cylindrical shell body, is arranged at the same of cylindrical shell body one end
Mandrel connector output interface, the pickoff electrode for being arranged at the cylindrical shell body other end and the letter being arranged in cylinder case body
Number modulate circuit, voltage conversion circuit and electric cable connection circuit；The pickoff electrode, the signal conditioning circuit, the voltage
Conversion circuit is sequentially connected, and is connected to the coaxial connector output interface.
4. a kind of noise according to claim 3 and shelf depreciation positioning GIS state of insulation on-line monitoring systems, its feature
Be, the pickoff electrode includes two covering of the fans using butterfly symmetrical structure, and covering of the fan size and frequency in 300MHz extremely
Electromagnetic wave signal wavelength in the range of 3GHz matches.
5. a kind of noise according to claim 1 and shelf depreciation positioning GIS state of insulation on-line monitoring systems, its feature
It is, the monitoring host includes a host housing, is arranged at Acquisition Circuit in the host housing, FPGA, memory, Wei Chu
Device is managed, and is arranged at the display screen of host housing upper surface；The FPGA, the Acquisition Circuit, the memory and institute
Display screen is stated with the microprocessor to be connected；The configured coaxial connector in the host housing of the Acquisition Circuit exports
Interface and the connection cables are connected to the multi-channel electronic switch unit.
6. a kind of noise according to claim 1 and shelf depreciation positioning GIS state of insulation on-line monitoring systems, described micro-
Processor carries GIS partial discharge on-line monitoring module and local breakdown location module；The GIS partial discharge monitors mould on-line
Block exports measurement data by the display screen；It is single that the shelf depreciation locating module includes the matching of both-end partial discharge pulse
Member and both-end partial discharge pulse positioning using TDOA unit.
7. a kind of noise according to claim 6 and shelf depreciation positioning GIS state of insulation on-line monitoring systems, its feature
It is, both-end partial discharge pulse matching unit works as the both-end by calculating the both-end partial discharge pulse time difference
Partial discharge pulse's time difference is less than the maximum time difference that electric signal is propagated in whole GIS, then is matching pulse；The both-end office
Portion's discharge pulse positioning using TDOA unit reaches the first and last measurement end time difference by calculating the matching pulse, obtains Partial Discharge Sources
With the distance of measurement end.
8. a kind of noise according to claim 7 and shelf depreciation positioning GIS state of insulation on-line monitoring systems, its feature
It is, is calculated in the following way the time difference per phase both-end partial discharge pulse：
Note first sensor any sensor into 3rd sensor measure m pulse, according to gomma be 1,2 ...,
I ..., m, and remember that i-th of pulse corresponding time is ti；4th sensor any sensor into the 6th sensor measures
N pulse, according to gomma for 1,2 ..., j ..., n, and remember the corresponding time t of j-th of pulsej；
The then time difference：
Tij=ti-tj (1)
Wherein, i is any integer between 1 and n；J is any integer between 1 and m；Mn time difference is always obtained；
After two sensors on per phase complete installation, the distance between its L is known；Shelf depreciation is between two sensors
The value that the maximum time difference T of propagation is also to determine, and：
<mrow>
<mi>T</mi>
<mo>=</mo>
<mfrac>
<mi>L</mi>
<mi>v</mi>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, L is the geometric distance between every two sensors of phase；V is spread speed of the electromagnetic wave in GIS；
The mn time difference T that will be obtainedijAccording to size sequential on number axis, and time difference sequence is drawn in whole number axis
It is divided into three sections (- ∞ ,-T), [- T ,+T], (+T ,+∞)；Expressed with inequality, in the section of both sides, TijMeet following formula
(3)；In middle section, TijMeet following formula (4)：
|Tij| ＞ T (3)
|Tij|≤T (4)
The pulse of formula (3) will be met as noise；To meet the pulse of formula (4) as shelf depreciation, and as follows into
Row positioning：
The relative position x of shelf depreciation:
<mrow>
<mi>x</mi>
<mo>=</mo>
<mfrac>
<mi>L</mi>
<mn>2</mn>
</mfrac>
<mo>+</mo>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
<msub>
<mi>T</mi>
<mrow>
<mi>i</mi>
<mi>j</mi>
</mrow>
</msub>
<mi>v</mi>
<mo>.</mo>
</mrow>
9. a kind of noise according to claim 1 and shelf depreciation positioning GIS state of insulation on-line monitoring systems, its feature
It is, the connection cables carry the signal cable of coaxial connector for both-end.
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| CN201711281550.5A CN107991593A (en) | 2017-12-06 | 2017-12-06 | A kind of noise and shelf depreciation positioning GIS state of insulation on-line monitoring systems |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208667A (en) * | 2019-07-10 | 2019-09-06 | 江苏利得智能监测科技有限公司 | GIS equipment partial discharge localization method based on time switch technology |
| CN111007362A (en) * | 2019-12-27 | 2020-04-14 | 广东电网有限责任公司电力科学研究院 | Power distribution network fault line selection positioning system, method and equipment |
| CN113311299A (en) * | 2021-05-26 | 2021-08-27 | 广西电网有限责任公司南宁供电局 | CVT insulation defect detection method and device |
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| CN111007362A (en) * | 2019-12-27 | 2020-04-14 | 广东电网有限责任公司电力科学研究院 | Power distribution network fault line selection positioning system, method and equipment |
| CN113311299A (en) * | 2021-05-26 | 2021-08-27 | 广西电网有限责任公司南宁供电局 | CVT insulation defect detection method and device |
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