CN109765464A - Partial discharge monitoring device in a kind of 10kV distribution cable transition joint - Google Patents
Partial discharge monitoring device in a kind of 10kV distribution cable transition joint Download PDFInfo
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- CN109765464A CN109765464A CN201811531659.4A CN201811531659A CN109765464A CN 109765464 A CN109765464 A CN 109765464A CN 201811531659 A CN201811531659 A CN 201811531659A CN 109765464 A CN109765464 A CN 109765464A
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Abstract
The present invention relates to partial discharge monitoring devices in a kind of 10kV distribution cable transition joint, including power supply unit, electromagnetic guide unit, signal processing unit, host system, cable body, transition joint gauze screen, cable intermediate joint ontology, power supply unit protection shell and signal processing unit to protect shell；A part of electromagnetic guide unit is built in cable intermediate joint ontology, to the electromagnetic wave signal that detection cable transition joint ontology shelf depreciation generates, and electromagnetic wave signal is sent to signal processing unit；Another part of electromagnetic guide unit is set to outside transition joint gauze screen, to the space radiated electromagnetic wave near cable intermediate joint ontology；It after signal processing unit receives electromagnetic wave signal, amplifies and filters, and electromagnetic wave signal is transmitted to system host by way of wireless transmission and is analyzed；Power supply unit is powered for signal processing unit.The present invention can be improved the detection effect and working efficiency of cable connector partial discharge.
Description
Technical field
The present invention relates to power equipment Partial Discharge Detection field, especially a kind of 10kV distribution cable transition joint ontology
Middle partial discharge monitoring device.
Background technique
10kV power cable is widely applied in distribution network systems, and safe operation is very heavy for customer power supply reliability
It wants.Operating experience for many years show the failure on cable run mostly be due to caused by cable intermediate joint ontology insulation fault,
Being primarily due to transition joint is formed by artificial scene is hand-made, inevitably by factors such as environment and manual skills
Influence, cause filth, insulation harm, component dislocation the defects of.Therefore, carry out distribution cable state of insulation detection technique and set
Standby exploitation has great importance for the safe operation of cable.
Partial Discharge Detection is the relatively conventional means of Current Diagnostic state of insulation, has obtained being widely recognized as industry.Example
Such as: (1) based on the measuring technology of oscillation wave, in the case where cable is out of service, by applying voltage in head end, being adopted in head end
Collect and analyze the signal that partial discharge in cable travels to head end, can position along partial discharge occur accurate location.
(2) measuring technology based on pulse current in cable grounding line, by measurement cable ends bonding line
Pulse current, being capable of shelf depreciation in the case where cable does not have a power failure in detection cable.But there is also apparent for two methods
Disadvantage, oscillation wave technology need cable out of service, influence to power, and the poor anti jamming capability of pulse current method, detection it is sensitive
It spends low.
Summary of the invention
In view of this, the purpose of the present invention is to propose to partial discharge monitorings in a kind of 10kV distribution cable transition joint to fill
It sets, can be improved the detection effect and working efficiency of cable connector partial discharge.
The present invention is realized using following scheme: partial discharge monitoring device in a kind of 10kV distribution cable transition joint, packet
Include power supply unit, electromagnetic guide unit, signal processing unit, host system, cable body, transition joint gauze screen, in cable
Between joint body, power supply unit protection shell and signal processing unit protect shell；Said supply unit is arranged in the power supply
In cell protection shell, the signal processing unit setting is in signal processing unit protection shell, said supply unit
Protection shell is mounted on the cable body, and the signal processing unit protection shell setting is outer in said supply unit protection
It is connected on the outside of shell and with said supply unit protection shell；The cable intermediate joint ontology is by the transition joint gauze screen packet
It wraps up in；A part of the electromagnetic guide unit is built in the cable intermediate joint ontology, to detect in the cable indirectly
The electromagnetic wave signal that head ontology shelf depreciation generates, and the electromagnetic wave signal is sent to by way of wireless transmission described
Signal processing unit；Another part of the electromagnetic guide unit is set to outside the transition joint gauze screen, to institute
State the space radiated electromagnetic wave near cable intermediate joint ontology；The signal processing unit receives the electromagnetic wave signal
Afterwards, the electromagnetic wave signal is converted into voltage signal, and the voltage signal is amplified and filtered, at the same will amplification and
Filtered voltage signal is converted into digital signal, and by the digital data transmission to the master by way of wireless transmission
Machine system is analyzed；Said supply unit is that the signal processing unit is powered.
Further, said supply unit includes taking energy coil and voltage regulator circuit；The taking energy coil and pressure stabilizing electricity
Road is electrical connected.
Further, the taking energy coil is divided into three parts, every part-structure is identical account for overall coil radian three/
One, the radian of every part is 120 degree, and every part is wound with the copper wire of identical the number of turns, and copper wire the number of turns is greater than 120 circles, copper wire cross section
Product is greater than 0.5mm2；There are 1 output end, a total of 3 output ends of taking energy coil in every part.
Further, the electromagnetic guide unit includes electromagnetic coupler, connection cables and electromagnetic launcher；The electromagnetism
Coupler is built in the cable intermediate joint ontology；The output end of the input terminal of the connection cables and the electromagnetic coupler
It is electrical connected；The output end of the connection cables and the input terminal of the electromagnetic launcher are electrical connected；The electromagnetic launcher
Be set to outside the transition joint gauze screen, into the cable intermediate joint body plenum radiation center frequency be
The electromagnetic wave of 400MHz.
Further, the signal processing unit include electromagnetic receiver, signal conditioning unit, signal acquisition unit and
Wireless transmission unit；The antenna of the electromagnetic receiver and the input terminal of the signal conditioning unit are electrical connected；Will lead to
It crosses the electromagnetic receiver and sends the signal conditioning unit for the voltage signal that the electromagnetic wave signal is converted into；The letter
The output end of number conditioning unit is electrical connected with the signal acquisition unit input terminal, described to pass through the voltage signal
Signal conditioning unit is filtered and amplifies, and sends the signal acquisition list for the voltage signal after filtering and amplification
Member；The signal acquisition unit output end is electrical connected with wireless transmission unit input terminal, will pass through the signal acquisition
The digital data transmission that voltage signal is converted by unit is to the wireless transmission unit；The wireless transmission unit also with it is described
Host system communication is connected, the digital signal is transmitted to the host system by way of wireless transmission and is uploaded
The unique identifier for the cable intermediate joint that the wireless transmission unit is monitored, make the host system to different cables among
The shelf depreciation information of connector carries out classification preservation.
Further, the host system includes microprocessor unit and display；The microprocessor unit and institute
Wireless transmission unit is stated to communicate wirelessly；Have preset shelf depreciation diagnostic program in the microprocessor unit, into
The statistics and analysis of row local discharge signal；The microprocessor unit is also electrical connected with the display, to complete office
The display for putting analysis data is recorded for tester.
Further, the microprocessor unit carries out the statistics and analysis of local discharge signal specifically: counts and divides
Analyse the distribution of the number and intensity of discharge pulse in a cycle；The a cycle is power frequency period, that is, 20ms.
Compared with prior art, the invention has the following beneficial effects:
1, the present invention is used based on the electromagnetic guide unit built in sensor, realizes transition joint on distribution cable route
Highly sensitive live detection, reduces testing cost.
2, the present invention uses wireless signal transmission form, so that China was laid in a manner of earth's surface channel, subterranean tunnel
Efficient inspection on cable run is possibly realized and guarantees safety when user of service operates the instrument, improves work effect
Rate.
3, electromagnetic coupler of the present invention can detect multiple sides using multi-electrode drops dipole antenna
To local discharge signal, improve the sensitivity of test.
Detailed description of the invention
Fig. 1 is the system pie graph of the embodiment of the present invention.
Fig. 2 is the taking energy coil schematic diagram of the embodiment of the present invention.
Fig. 3 is the voltage regulator circuit schematic diagram of the embodiment of the present invention.
Fig. 4 is the electromagnetic coupler schematic diagram of the embodiment of the present invention.
Fig. 5 is the electromagnetic launcher schematic diagram of the embodiment of the present invention.
Fig. 6 is the signal conditioning unit schematic diagram of the embodiment of the present invention.
Fig. 7 is the field conduct schematic diagram of the embodiment of the present invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
As shown in Fig. 1,7, partial discharge monitoring device in a kind of 10kV distribution cable transition joint is present embodiments provided,
Including power supply unit, electromagnetic guide unit, signal processing unit, host system, cable body, transition joint gauze screen, cable
Transition joint ontology, power supply unit protection shell and signal processing unit protect shell；Said supply unit is arranged in the confession
Electric unit is protected in shell, and in signal processing unit protection shell, the power supply is single for the signal processing unit setting
Member protection shell is mounted on the cable body, and the signal processing unit protection shell setting is protected in said supply unit
Outer side of shell is simultaneously connected with said supply unit protection shell；The cable intermediate joint ontology is by the transition joint gauze screen
Package；A part of the electromagnetic guide unit is built in the cable intermediate joint ontology, to detect among the cable
The electromagnetic wave signal that joint body shelf depreciation generates, and the electromagnetic wave signal is sent to institute by way of wireless transmission
State signal processing unit；Another part of the electromagnetic guide unit is set to outside the transition joint gauze screen, to
Space radiated electromagnetic wave near the cable intermediate joint ontology；The signal processing unit receives the electromagnetic wave signal
Afterwards, the electromagnetic wave signal is converted into voltage signal, and the voltage signal is amplified and filtered, at the same will amplification and
Filtered voltage signal is converted into digital signal, and by the digital data transmission to the master by way of wireless transmission
Machine system is analyzed；Said supply unit is that the signal processing unit is powered.
In the present embodiment, said supply unit includes taking energy coil and voltage regulator circuit；The taking energy coil and described steady
Volt circuit is electrical connected.
In the present embodiment, as shown in Fig. 2, the taking energy coil is divided into three parts, every part-structure is identical to account for bus
The one third of radian is enclosed, the radian of every part is 120 degree, and every part is wound with the copper wire of identical the number of turns, and copper wire the number of turns is greater than 120
Circle, copper wire cross-sectional area are greater than 0.5mm2；There are 1 output end, a total of 3 output ends of taking energy coil in every part.
In the present embodiment, as shown in figure 3, voltage regulator circuit gives 24V lithium-cell plate after it can pass through rectification, pressure stabilizing, boosting
It charges.Three input terminals of voltage regulator circuit are connected with three output ends of taking energy coil, capacitor C in voltage regulator circuit1For 47 μ F,
C2For 300 μ F, inductance L1For 0.1mH, resistance R1For 100 Ω, resistance R2For 60 Ω, IGBT(S1) duty ratio be 30%, cut-off frequency
Rate is 1kHz.
In the present embodiment, the electromagnetic guide unit includes electromagnetic coupler, connection cables and electromagnetic launcher；It is described
Electromagnetic coupler is built in the cable intermediate joint ontology；The input terminal of the connection cables is defeated with the electromagnetic coupler
Outlet is electrical connected；The output end of the connection cables and the input terminal of the electromagnetic launcher are electrical connected；The electromagnetism hair
Emitter is set to outside the transition joint gauze screen, to the radiation center frequency into the cable intermediate joint body plenum
For the electromagnetic wave of 400MHz.
Preferably, in the present embodiment, as shown in figure 4, electromagnetic coupler is just planted in cable connector manufacturing process
Enter within joint metal gauze screen, using multi-electrode drops dipole antenna, material is the copper foil that thickness is less than 0.3mm, long
Degree is 30mm, arc diameter 8mm.Insulation board has certain elasticity, can be bonded using being made with a thickness of the nylon of 0.5mm
Connector surface of insulating layer between in the cable.Connection cables use the RG58 type coaxial cable of copper silver coating material, have fabulous height
Frequency characteristic, length are less than 5cm.As shown in figure 5, electromagnetic launcher is exported using spherical element antenna, input terminal and connection cables
End is connected.The shell of electromagnetic launcher is connected with metallic shield net, can into space radiation center frequency be 400MHz electromagnetism
Wave.Kept apart between metal shell and spherical element antenna with the epoxy material of 2mm thickness；Electromagnetic launcher outer dimension a is
2cm, b 3cm, c 4cm, d 0.5cm.
In the present embodiment, the signal processing unit includes electromagnetic receiver, signal conditioning unit, signal acquisition list
Member and wireless transmission unit；Electromagnetic receiver is consistent with electromagnetic launcher structure, and metal shell with equipment is connected, antenna and letter
The input terminal of number conditioning unit is connected.As shown in fig. 6, the centre frequency of signal conditioning unit (18) is 400MHz, amplification factor
It is 30；R in signal conditioning circuit1、R2、R5For 20k, R3、R7For 10k, C1、C3、C5、C7For 0.1 μ F, C2、C4、C6、C8For 10 μ
F；The centre frequency of signal conditioning unit is 400MHz, amplification factor 30；Signal acquisition unit is compared using 12 high-speed a/ds
Device and high speed 64GB solid-state memory；The input terminal electrical property phase of the antenna of the electromagnetic receiver and the signal conditioning unit
Even；The signal condition will be sent by the voltage signal that the electromagnetic wave signal is converted by the electromagnetic receiver
Unit；The output end of the signal conditioning unit is electrical connected with the signal acquisition unit input terminal, to by the voltage
Signal is filtered and is amplified by the signal conditioning unit, and is sent the voltage signal after filtering and amplification to described
Signal acquisition unit；The signal acquisition unit output end is electrical connected with wireless transmission unit input terminal, will pass through institute
Digital data transmission that voltage signal is converted by signal acquisition unit is stated to the wireless transmission unit；The wireless transmission is single
Member is also connected with host system communication, the digital signal is transmitted to the host by way of wireless transmission
System and the unique identifier for uploading the cable intermediate joint that the wireless transmission unit is monitored, make the host system to not
Shelf depreciation information with cable intermediate joint carries out classification preservation.
Preferably, in the present embodiment, the electromagnetic receiver receives the electromagnetic wave that the electromagnetic launcher issues, and will
The electromagnetic wave signal is converted into voltage signal, while sending the signal conditioning unit for the voltage signal；The letter
Number conditioning unit is filtered to the voltage signal and enhanced processing, and sends the voltage signal after filtering and amplification to
The signal acquisition unit；Voltage signal after being filtered and being amplified is converted into digital signal by the signal acquisition unit,
And it is transferred to the wireless transmission unit；The wireless transmission unit transmits the digital signal by way of wireless transmission
To the host system.
Preferably, in the present embodiment, wireless transmission unit uses low-consumption wireless mechanics of communication, and every 10s detection is that have
There are connection requests, cut off wireless transmission unit power supply if connectionless request, reduce power consumption；Wireless transmission unit and host system
It unites after successful connection, the unique identifier of monitored cable intermediate joint will be uploaded, convenient for the host system to different electricity
The shelf depreciation information of cable transition joint carries out classification preservation.All frequencies of wireless transmission unit are 5GHz, with electromagnetic launcher
Centre frequency 400MHz difference it is larger, will not influence electromagnetic receiver receive electromagnetic wave signal.
Preferably, in the present embodiment, equipment is just written this in wireless transmission unit in advance when installing and sets
Standby exclusive identification code, this identification code and detected cable connector correspond.
In the present embodiment, the host system includes microprocessor unit and display；The microprocessor list
Member uses ARM9 embedded chip, burning shelf depreciation diagnostic program in microprocessor unit, to carry out shelf depreciation letter
Number statistics and analysis；The microprocessor unit is communicated wirelessly with the wireless transmission unit；The microprocessor list
Member is also electrical connected with the display, and the display uses MTF043056B0 LCD screen, to complete partial discharge analysis number
According to display, for tester record.
In the present embodiment, the microprocessor unit carries out the statistics and analysis of local discharge signal specifically: statistics
With the distribution of the number and intensity of discharge pulse in analysis a cycle；The a cycle is power frequency period, that is, 20ms.
Preferably, in the present embodiment, power supply unit is mounted on cable body, the shell and signal processing of power supply unit
Cell enclosure is connected；The electromagnetic coupler of electromagnetic guide unit is partially installed on the inside of transition joint gauze screen, Electromagnetic Launching list
Member is partially installed on the outside of transition joint gauze screen.Host system is wirelessly connect with signal processing unit.
Preferably, the present embodiment is used based on the electromagnetic guide unit built in sensor, distribution cable route is realized
The highly sensitive live detection of upper transition joint；And use wireless signal transmission form, it is ensured that user of service operates the instrument
Safety when device, for those be mounted on earth's surface channel, the cable connector in subterranean tunnel can also aspect inspection, improve electricity
The detection effect and working efficiency of cable joint partial discharge.
Preferably, the present embodiment uses the power supply mode for taking energy from cable body, (taking energy unit is electric from three-core cable core
Energy is obtained in the time-varying magnetic field that stream induces, for powering to signal processing unit) it solves with earth's surface channel, subterranean tunnel
It is difficult to the problem of power supply is provided along the cable run that mode is laid, reduces use cost.
Preferably, the present embodiment can solve the cable connector laid in current cable duct, cable tunnel and cable shaft
The live detection problem of state of insulation.As the electromagnetic guide unit built in using based on sensor, and wirelessly to work
Mode realizes the telemetering and diagnosis of cable connector state of insulation.The working principle of the present embodiment is: connector between in the cable
During field fabrication, it is implanted into coupled antenna wherein, and the electricity in joint metal net will be shielded in by signal cable
Introduction by magnetic field is launched to outside by antenna, to solve the undetectable problem of Partial discharge signal.Due to implantation
Antenna is fully sealed by the filling epoxy resin in the subsequent production of connector, and built-in antenna is also placed in the surface of earth shield net, because
No matter this all will not influence the long-term safety operation of cable connector from the angle of electric insulation or the angle of mechanical seal.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (7)
1. partial discharge monitoring device in a kind of 10kV distribution cable transition joint, it is characterised in that: including power supply unit, electromagnetism
Guidance unit, signal processing unit, host system, cable body, transition joint gauze screen, cable intermediate joint ontology, power supply
Cell protection shell and signal processing unit protect shell；Said supply unit setting is protected in shell in said supply unit,
In signal processing unit protection shell, said supply unit protection shell is mounted on institute for the signal processing unit setting
State on cable body, signal processing unit protection shell setting said supply unit protect outer side of shell and with the confession
Electric unit protects shell to be connected；The cable intermediate joint ontology is wrapped up by the transition joint gauze screen；The electromagnetic guide
A part of unit is built in the cable intermediate joint ontology, produces to detect the cable intermediate joint ontology shelf depreciation
Raw electromagnetic wave signal, and the electromagnetic wave signal is sent to the signal processing unit by way of wireless transmission；Institute
The another part for stating electromagnetic guide unit is set to outside the transition joint gauze screen, to the cable intermediate joint sheet
The space radiated electromagnetic wave of body surrounding；After the signal processing unit receives the electromagnetic wave signal, the electromagnetic wave is believed
Number it is converted into voltage signal, and the voltage signal is amplified and filtered, while will amplification and filtered voltage signal
It is converted into digital signal, and is analyzed the digital data transmission to the host system by way of wireless transmission；
Said supply unit is that the signal processing unit is powered.
2. partial discharge monitoring device in a kind of 10kV distribution cable transition joint ontology according to claim 1, special
Sign is: said supply unit includes taking energy coil and voltage regulator circuit；The taking energy coil is electrical connected with the voltage regulator circuit.
3. partial discharge monitoring device in a kind of 10kV distribution cable transition joint ontology according to claim 2, special
Sign is: the taking energy coil is divided into three parts, the identical one third for accounting for overall coil radian of every part-structure, every part
Radian is 120 degree, and every part is wound with the copper wire of identical the number of turns, and copper wire the number of turns is greater than 120 circles, and copper wire cross-sectional area is greater than
0.5mm2；There are 1 output end, a total of 3 output ends of taking energy coil in every part.
4. partial discharge monitoring device in a kind of 10kV distribution cable transition joint ontology according to claim 1, special
Sign is: the electromagnetic guide unit includes electromagnetic coupler, connection cables and electromagnetic launcher；Built in the electromagnetic coupler
In the cable intermediate joint ontology；The input terminal of the connection cables and the output end of the electromagnetic coupler are electrical connected；
The output end of the connection cables and the input terminal of the electromagnetic launcher are electrical connected；The electromagnetic launcher is set to described
Outside transition joint gauze screen, to the electromagnetism that radiation center frequency is 400MHz into the cable intermediate joint body plenum
Wave.
5. partial discharge monitoring device in a kind of 10kV distribution cable transition joint ontology according to claim 1, special
Sign is: the signal processing unit includes that electromagnetic receiver, signal conditioning unit, signal acquisition unit and wireless transmission are single
Member；The antenna of the electromagnetic receiver and the input terminal of the signal conditioning unit are electrical connected；The electromagnetism will be passed through
The voltage signal that the electromagnetic wave signal is converted into is sent the signal conditioning unit by receiver；The signal conditioning unit
Output end be electrical connected with the signal acquisition unit input terminal, to by the voltage signal pass through the signal condition list
Member is filtered and amplifies, and sends the signal acquisition unit for the voltage signal after filtering and amplification；The signal
Acquisition unit output end is electrical connected with wireless transmission unit input terminal, will be believed voltage by the signal acquisition unit
Number digital data transmission being converted into is to the wireless transmission unit；The wireless transmission unit is also communicated with the host system
It is connected, the digital signal is transmitted to the host system by way of wireless transmission and uploads the wireless transmission
The unique identifier for the cable intermediate joint that unit is monitored puts the host system to the part of different cable intermediate joints
Power information carries out classification preservation.
6. partial discharge monitoring device in a kind of 10kV distribution cable transition joint ontology according to claim 1, special
Sign is: the host system includes microprocessor unit and display；The microprocessor unit and the wireless transmission
Unit communicates wirelessly；There is preset shelf depreciation diagnostic program in the microprocessor unit, to carry out shelf depreciation
The statistics and analysis of signal；The microprocessor unit is also electrical connected with the display, to complete partial discharge analysis data
Display, for tester record.
7. partial discharge monitoring device in a kind of 10kV distribution cable transition joint ontology according to claim 6, special
Sign is: the microprocessor unit carries out the statistics and analysis of local discharge signal specifically: statistics and analysis a cycle
The distribution of the number and intensity of interior discharge pulse；The a cycle is power frequency period, that is, 20ms.
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| CN201811531659.4A CN109765464B (en) | 2018-12-14 | 2018-12-14 | Partial discharge monitoring device in 10kV distribution cable intermediate head |
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| CN201811531659.4A CN109765464B (en) | 2018-12-14 | 2018-12-14 | Partial discharge monitoring device in 10kV distribution cable intermediate head |
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| CN110632468A (en) * | 2019-09-04 | 2019-12-31 | 国网辽宁省电力有限公司电力科学研究院 | Wireless cable partial discharge detection device, system and method based on high-frequency current sensor |
| CN111337803A (en) * | 2020-03-20 | 2020-06-26 | 国网陕西省电力公司电力科学研究院 | Built-in high-voltage cable intermediate joint partial discharge detection and self-energy-taking integrated system and operation method thereof |
| CN111796174A (en) * | 2020-09-09 | 2020-10-20 | 国网山东省电力公司高密市供电公司 | Detection device for high-voltage cable head |
| CN113189440A (en) * | 2021-03-09 | 2021-07-30 | 浙江图维科技股份有限公司 | Lead sealing communication detection device and method based on signal coupling technology |
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| CN109765464B (en) | 2021-08-27 |
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