CN105182043B - Detection device with non-contact sensor to UHVDC Arrester leakage current - Google Patents
Detection device with non-contact sensor to UHVDC Arrester leakage current Download PDFInfo
- Publication number
- CN105182043B CN105182043B CN201510610641.3A CN201510610641A CN105182043B CN 105182043 B CN105182043 B CN 105182043B CN 201510610641 A CN201510610641 A CN 201510610641A CN 105182043 B CN105182043 B CN 105182043B
- Authority
- CN
- China
- Prior art keywords
- coil winding
- arrester
- current
- unit
- output terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Detection device with non-contact sensor to UHVDC Arrester leakage current, including data acquisition unit, data processing unit, protect circuit unit and power supply unit, data acquisition unit includes current sensor, power amplifier and circuit acquisition module, current sensor includes a toroidal shell, the magnetic core of one C-shaped arrangement and a precision electromagnetic sensor, an accommodating space is provided with toroidal shell, rotating around equipped with a first coil winding and a second coil winding on magnetic core, and the magnetic core is installed in the accommodating space, magnetic flux density direction caused by the second coil winding is opposite with the magnetic flux density direction of the first coil winding.The present invention is acquired lightning arrester leakance using contactless, it thereby may be ensured that collecting unit can effectively and stably be run in complex electromagnetic fields, not only voltage endurance capability is greatly lifted, but also can have stronger self- recoverage and adaptive ability under overvoltage.
Description
Technical field
The present invention relates to UHVDC Transmission Lines arrester state inspection, refer in particular to non-contact sensor to spy
The detection device of high voltage direct current leakage current of an arrester.
Background technology
With China's rapid economic development, electricity needs increases rapidly, and there are in electric power resource distribution and load in China
The unmatched natural characteristic in heart district domain is, it is necessary to by remote, large capacity transmission circuit improvement imbalance between power supply and demand problem, " west
Send in electric east ", the engineering such as " north and south supply mutually " be major deployments scheme at this stage, extra-high voltage direct-current transmission technology is specific to implement skill
Art means.
Alternating current is transformed into direct current by direct current transportation by transverter, is then sent by DC power transmission line to receiving end
And alternating current is become by transverter, finally inject AC network.The voltage class concept of extra-high voltage direct-current transmission is defeated with exchanging
Electricity is different.For ac transmission, 220kV and following voltage class are generally known as high pressure, the title of 330~750kV
For super-pressure, the referred to as extra-high voltage of 1000kV and the above.Direct current transportation is then slightly different, and ± more than 100kV's is referred to as high pressure；
± 500kV and ± 600kV are still referred to as high pressure, are not known as super-pressure generally；And then it is known as extra-high voltage more than ± 600kV.
± 800kV extra-high voltage direct-current transmissions can have a large amount of big load centers of electric power direct sending defeated since centre is without drop point
Send that capacity is big, power transmission distance is remote, saves the advantages that transmission of electricity stringing corridor, relevant device research and development, control are with the technology such as running and showing
Model engineering is rapidly developed and extensive use in recent years, China is in world's neck in UHV transmission technical field
First status, leads technological development direction and key equipment Development Trend.
The construction of extra-high voltage DC transmission system, be unable to do without overvoltage protection, direct current arrester is extra-high voltage direct-current
The key equipment of transmission system overvoltage protection, determines the dielectric level of whole system, influences equipment volume, project occupation of land face
Product and cost.It is most important for the Insulation Coordination of optimization system and reduction project cost to improve protection of arrester level.Grasp
Direct current arrester real-time running state and protection feature are to strengthening the operational management of direct-current ultra high voltage transmission system equipment, improving it
Live detection technology and the horizontal tool of repair based on condition of component are of great significance.
For now, the service condition of direct current arrester is much harsher than alternating-current lightning arrestor, to direct current arrester
The technical requirements that runnability proposes are very high.Direct current arrester structure, operating condition, action principle, protection feature etc. with friendship
It is different to flow arrester.In order to find the making moist of direct current arrester, aging and other hidden danger in time, avoid huge caused by accident
Economic loss, while improving ultra-high voltage lightning arrester product reliability, strengthening quality control, carries out ultra-high voltage lightning arrester
It is urgent that line monitors significant and demand.Particularly need one kind to be directed in a hurry to keep away extra-high voltage direct-current with non-contact sensor
The detection device and detection method of thunder device leakage current.
Chinese utility model patent（CN202693723U）A kind of leakage current of an arrester alarm system is disclosed, including is kept away
Thunder device and counter, arrester are connected with the first current transformer and the second current transformer for switching current, the first electricity
Current transformer is connected with reference voltage circuit, and reference voltage is added on first voltage conversion circuit, the second electricity by reference voltage circuit
Current transformer is connected with first voltage conversion circuit, and first voltage conversion circuit is powered for the first warning device, and first voltage turns
Change circuit and be connected with the progress secondary voltage conversion of second voltage conversion circuit, second voltage conversion circuit is that the second warning device supplies
Electricity.Although above leakage current alarm system principle is simple, alarm effect is obvious, but during actual use also
Have the following disadvantages：1st, above leakage current alarm system is mainly in transmission line of alternation current, since arrester exists
Service condition in extra high voltage direct current transmission line is much harsher than alternating-current lightning arrestor, the self-insurance particularly in Lightning Over-voltage
Shield requirement may also be difficult to reach, thus the technical requirements of leakage current alarm system can not meet in extra-high voltage direct-current transmission line
Effectively and stably run in road；2nd, above leakage current alarm system major function is to carry out qualitative operation, can not be right
All the time the big decimal fractions of middle leakage current are detected.
The content of the invention
The present invention provides the detection device with non-contact sensor to UHVDC Arrester leakage current, its main mesh
Be overcome existing leakage current alarm system to UHVDC Arrester leakage current can not stablize and accurately examine
The defects of survey.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
Detection device with non-contact sensor to UHVDC Arrester leakage current, including data acquisition unit,
Data processing unit, protection circuit unit and power supply unit, the data acquisition unit include current sensor, power amplification
Device and circuit acquisition module, the current sensor include a toroidal shell, the magnetic core of a C-shaped arrangement and an accurate magnetic
Electric transducer, is provided with an accommodating space in the toroidal shell, on the magnetic core rotating around equipped with a first coil winding with
And a second coil winding, and the magnetic core is installed in the accommodating space, and the precision electromagnetic sensor is also installed in institute
State in accommodating space and its both ends and the both ends of the magnetic core to abut, input terminal and the arrester of the first coil winding leak
Electric current is electrically connected, and the input terminal of the second coil winding is electrically connected with an output terminal of the power amplifier, the power
Another output terminal of amplifier is electrically connected with the circuit acquisition module, magnetic flux density side caused by the second coil winding
To opposite with the magnetic flux density direction of the first coil winding.
Further, diskette of the precision electromagnetic sensor including an arc-shaped arrangement is connected on the diskette
Data contacts, the power amplifier include an operational amplifier being electrically connected with the data contacts output terminal, one the 1st
Pole pipe, one second triode and an input power, the collector of first triode are electrically connected to the input power
Positive interface, the collector of second triode are connected to the negative interface of the input power, the output of the power amplifier
End is divided into two-way, is connected to the base stage of first triode all the way, another way is connected to the base stage of second triode, institute
The amplifying stage for stating the first triode is divided into two-way, is connected to the input terminal of the second coil winding all the way, and another way is connected to
The amplifying stage of second triode, the circuit acquisition module are connected to the second coil winding output terminal including one end
Measure resistance R1 and the ammeter for measuring current values in the measurement resistance, another termination of the measurement resistance R1
Ground.
Further, the toroidal shell includes a shield shell and the insulation shell being arranged on the outside of the shield shell
Body, the magnetic core include two symmetrically arranged arc pellets and a fixing pipe, and two arc pellets are respectively mutually abutted with one end,
And it is socketed in the both sides of the abutted position by the fixing pipe, the arc pellet is made of nano amorphous material
Arc pellet, the fixing pipe are nano amorphous material fixing pipe.
Further, the toroidal shell includes a shield shell and the insulation shell being arranged on the outside of the shield shell
Body, the magnetic core include two symmetrically arranged arc pellets and a fixing pipe, and two arc pellets are respectively mutually abutted with one end,
And it is socketed in the both sides of the abutted position by the fixing pipe, the arc pellet is made of amorphous soft magnetic material
Arc pellet, the fixing pipe are amorphous soft magnet fixing pipe.
Further, the both ends of the diskette are respectively connected to one end of an arc pellet, shared by the diskette
According to volume be the accommodating space volume a quarter, the volume occupied by the fixing pipe is the accommodating space volume
A quarter, the volume not put on occupied by the part of fixing pipe in the arc pellet of the fixing pipe side is described
The a quarter of accommodating space volume, does not put on shared by the part of fixing pipe in the arc pellet of the fixing pipe opposite side
According to volume be the accommodating space volume a quarter, the second coil winding include upper second coil around portion and under
For second coil around portion, upper second coil is set around around portion does not put on fixation in the arc pellet of the fixing pipe side
The part of pipe, lower second coil is set around around portion does not put on fixing pipe in the arc pellet of the fixing pipe opposite side
Part, upper second coil is electrically connected to each other around portion and lower second coil around portion, and the first coil winding is set around institute
State the outside of fixing pipe.
Further, the detection device further includes a collection protection module, the electric energy output end point of the power supply unit
Cheng Silu, is electrically connected the electrical energy inputs in protection circuit unit, the electrical energy inputs for gathering protection module, data acquisition
The electrical energy inputs of unit and the electrical energy inputs of data processing unit, the output terminal of arrester electric current are divided into two-way, all the way
The Enable Pin of the data acquisition unit is connected to, another way is connected to the Enable Pin of the collection protection module, the collection
The output terminal of protection module is connected to the Enable Pin of the protection circuit unit, and the Enable Pin of the data processing unit is equipped with two
Road, connects the output terminal of the data acquisition unit, the output terminal of the another way connection protection circuit unit, when lightning-arrest all the way
Device electric current is less than or equal to 1 milliampere hour, and collection protection module is failure to actuate, and data acquisition unit starts and carries out signal to electric current
Through being exported by data processing unit after collection and data processing；When arrester electric current is more than 1 milliampere hour, data acquisition unit is not
Dynamic, and gather protection module startup, high-impedance state is presented to input in the detection device, at this time without signal acquisition and data at
Reason, and exported via data processing unit.
Further, inert-gas diode and TVS diode are added in the extraction wire of the arrester electric current,
The TVS diode differential concatenation is grounded.
Further, it is loaded with AC signal on the diskette and/or magnetic core.
Further, the toroidal shell is set on the ground wire of arrester and it includes the left shell half that can mutually dismantle
Body and right half-shell body.
Further, the input terminal of the first coil winding adds inert-gas diode and TVS diode, should
TVS diode differential concatenation is grounded.
Compared to the prior art, the beneficial effect that the present invention produces is:
1st, the configuration of the present invention is simple, highly practical, when the direct current signal of arrester leakage current passes through first coil winding
The magnetic field produced afterwards in magnetic core is focused on precision electromagnetic sensor, and the voltage signal that precision electromagnetic sensor produces is through work(
Rate amplifier conducting, which acts on, to produce Contrary compensation electric current in second coil winding, the magnetic flux and arrester that compensation electric current produces
Flow direction caused by leakage current both on the contrary, after realizing magnetic balance, core flux zero, is mended in second coil winding
Electric current is repaid again after the test of oversampling circuit acquisition module, that is, draws the direct current signal value of leakage current of an arrester, thus the present invention
Lightning arrester leakance to be acquired using contactless, thereby may be ensured that collecting unit can in complex electromagnetic fields into
Row is effectively and stably run, and not only voltage endurance capability is greatly lifted, but also can be had under overvoltage more by force from extensive
Multiple and adaptive ability.
2nd, in the present invention, the modularization for being used for isolation detection electric current for core sensing element by using diskette is produced
Product, its operation principle are to use magnetic balance type principle, i.e., when electric current flows through the straight wire of a root long, are produced around conducting wire
Magnetic field, the size in magnetic field is directly proportional to the size of current for flowing through conducting wire, this magnetic field can be assembled by soft magnetic materials, then
It is detected with diskette, can since the change in magnetic field and the output voltage signal of diskette have good linear dependence
The output signal measured using diskette, directly reflects the size of current in conducting wire, and the advantage of diskette is its
Strong anti-interference ability, low temperature floats and high sensitivity, and particularly in the range of electric current is -1A to 1A electric currents, diskette is in magnetic
Good symmetry and sensitivity are showed in terms of flux density.
3rd, in the present invention, after by loading AC signal on diskette, the magnetic flux density of diskette will be just
To with reversely magnetize and demagnetize back and forth, can interrupt magnetic polarization process of the external electromagnetic field to magnetic material in this process.So
It can be very good to avoid the magnetic polarization of magnetic material.Be conducive to improve the accuracy of detection and service life of the present invention.
4th, in the present invention, may be selected to install additional in all lead-in conductors, extraction wire and other parts being necessary lazy
Property gas diode and TVS diodes prevent high current destroy circuit system.Since the TVS diodes startup time is fast, but
It is that electric discharge continuous capability is poor；And the startup time of inert-gas diode is slow, electric discharge continuous capability is strong.So both make at the same time
With can be good at solving the problems, such as circuit protection.
5th, in the present invention, complicated electromagnetic field to magnetic material in addition to it can cause the influence of magnetic polarization, it is also possible to shadow
Ring the steady operation of electronic circuit.So the present invention can also realize electromagnetism in terms of wire laying mode, structure design and shell processing
The function such as isolation, decoupling filtering, so as to enable a system to long-time steady operation.By setting shield shell and insulation shell,
Advantageously reduced the magnetic flux leakage of magnetic core, accordingly improved measurement accuracy, at the same also can effective shield perimeter electromagnetic field interference, subtract
Few measurement error.
6th, in the present invention, current sensor is by nano amorphous material, diskette, nano amorphous material fixing pipe and shielding
Shell is formed.In order to facilitate the installation of, nano amorphous material is made HALF structures by us.It is installed in nano amorphous material
Fixed afterwards using fixing pipe, to ensure that the material can be docked preferably sensor at work.The present invention is in the magnetic material of selection
During material, the problem of having fully taken into account heavy current impact.So we select nano amorphous and amorphous soft magnet as current sense
The core material of device.Amorphous soft magnet and nano amorphous material have good recovery capability, are bearing the heavy current impact of moment
Afterwards, can be very good to recover.
7th, in the present invention, when the direct current signal of arrester leakage current produces in magnetic core after first coil winding
Magnetic field be focused on diskette, diskette, which senses, will produce voltage after this part magnetic flux density, what diskette produced
Amplification of the voltage signal through operational amplifier completes the control of discharge to input power so that the positive interface of input power
Contrary compensation electric current, the magnetic flux that compensation electric current produces and magnetic caused by arrester leakage current are exported on to second coil winding
On the contrary, by control of the operational amplifier to Contrary compensation electric current, it is always definite value to make the magnetic flux density in magnetic core in logical direction, this
When second coil winding on compensate electric current and be input to ground after measured resistance R1 again, by ammeter to measuring resistance R1
The current values of interior circulation, and it is to draw the direct current signal of leakage current of an arrester to carry out scale operation according to the current values
Value, not only circuit structure is simple for above detection process, manufacturing cost is low, but also detection accuracy is high, can ensure signal detection
Precision.
Brief description of the drawings
Fig. 1 is the schematic block circuit diagram of embodiment one in the present invention.
Fig. 2 is the structure diagram of heretofore described data acquisition unit.
Fig. 3 is the schematic block circuit diagram of each component in Fig. 2.
Fig. 4 is the scheme of installation of heretofore described toroidal shell.
Fig. 5 is the principle sketch of the data acquisition unit.
Fig. 6 is the diskette and Hall material current-magnetic flux density profile comparison schematic diagram.
Fig. 7 is the diskette and Hall material temperature drift curve comparison schematic diagram.
Fig. 8 is that current densities comparison schematic diagram after AC signal is loaded on diskette.
Fig. 9 is the schematic block circuit diagram of embodiment two in the present invention.
Embodiment
Illustrate the embodiment of the present invention with reference to the accompanying drawings.
Embodiment one
With reference to Fig. 1.A kind of online detecting system of UHVDC Arrester leakage current, including one be arranged at direct current and keep away
The data sending that detection device 1 near thunder device, the leakage current testing result for the detection device 1 to be obtained are transmitted
Device, data sink, central monitoring device and mobile terminal 3.The data sending device is single for public network signal transmitting
Member 5, data sink is public network signal receiving unit 6.Public network signal transmitter unit 5 and public network signal receiving unit 6 can be with
Pass through mobile public network（GSM network or GPRS network）Realize data transfer, public network signal receiving unit 6 is preferred in the present embodiment
The communication mould of the modem of GSM network or GPRS network, 5 preferred GSM network of public network signal transmitter unit or GPRS network
Block.The central monitoring device includes background processor 40 and holder 41, the input terminal connection of the background processor 40
In the data sink, the output terminal of the background processor 40 is connected to the mobile terminal 3 and above-mentioned storage
Storage 41, the input terminal of the background processor 40 are also associated with an encryption unit 42, the output terminal connection of the holder 41
There is a terminal display 43.The Enable Pin of the data sink is connected to the output terminal of the data sending device, described
The Enable Pin of central monitoring device is connected to the output terminal of the data sink, and the output terminal of the central monitoring device connects
Connect the Enable Pin with the mobile terminal 3.By above-mentioned setting, maintenance personal can in time by the central monitoring device with
Short message or other forms know the relevant information of direct current arrester leakage current, so as to both avoid maintenance personnel severe
Weather is frequently patrolled surge arrester failure point, reduces the risk that maintenance personal gets an electric shock, and reduces the time recovered needed for line powering.
In the present embodiment, one can be built into and collect the various monitoring data of various regions UHVDC Arrester state
Cloud platform, it generallys include the Cloud Server by net connection（As described central monitoring device）, cloud client（As institute
State mobile terminal 3）With at least one measuring terminals（As it is arranged at the detection dress in each power grid on each UHVDC Arrester
Put 1 or the detecting instrument and equipment of other direct current arrester status informations, the function of these detecting instruments and equipment includes
It can realize grounding resistance, leakage current and harmonic wave, the electrostatic of the equipment such as measurement lightning protection or telecommunications, electric and electronics board
Deng change）.In the system normal operation, measuring terminals are by net connection by data transfer to Cloud Server, cloud
Client obtained from Cloud Server needed for measurement data, user inquires about measurement data by cloud client, shown, is defeated
Go out, utilization, the operation such as assessment, realize the associations of the associated objects for being pointed to Different field that conventional measurement techniques can not be completed
Tune or correlation measurement, so as to shorten time of measuring, realize and multiple measuring terminals are carried out at the same time with real time monitoring and to tested pair
The long-range measurement of elephant, while be conducive to analyse and study thunder-strike phenomenon scientifically.
With reference to Fig. 1.The detection device 1 includes data acquisition unit 10, data processing unit 11, protection circuit unit
12nd, power supply unit 13 and one gathers protection module 14.
The electric energy output end of the power supply unit 13 is divided into four tunnels, be electrically connected in protection circuit unit 12 electric energy it is defeated
Enter end, gather electrical energy inputs, the electrical energy inputs and data processing unit 11 of data acquisition unit 10 of protection module 14
Electrical energy inputs.At work, the output terminal of arrester electric current is divided into two-way, is connected to the data acquisition unit 10 all the way
Enable Pin, another way be connected to it is described collection protection module 14 Enable Pin, it is described collection protection module 14 output terminal connect
The Enable Pin of the protection circuit unit 12 is connected to, the Enable Pin of the data processing unit 11 is equipped with two-way, connects institute all the way
State the output terminal of data acquisition unit 10, the output terminal of the another way connection protection circuit unit 12, when arrester electric current is small
In or equal to 1 milliampere hour, collection protection module 14 is failure to actuate, and data acquisition unit 10 starts and carries out signal acquisition to electric current
Exported with being passed through after data processing by data processing unit 11；When arrester electric current is more than 1 milliampere hour, data acquisition unit 10 is not
It is dynamic, and gather protection module 14 and start, input is presented high-impedance state in the detection device 1, at this time without signal acquisition sum number
Exported according to processing, and via data processing unit 11.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The data acquisition unit 10 includes current sensor 7, power amplifier 8, electricity
Road acquisition module 9.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The current sensor 7 includes a toroidal shell 70, the magnetic of a C-shaped arrangement
71 and one precision electromagnetic sensor 72 of core, is provided with an accommodating space 700 in the toroidal shell 70, on the magnetic core 71 point
A first coil winding 710 and a second coil winding 711 are not arranged with, and the magnetic core 71 is installed on the accommodating space
In 700, the precision electromagnetic sensor 72 is also installed in the accommodating space 700 and its both ends and the two of the magnetic core 71
End adjoining, the input terminal of the first coil winding 710 are electrically connected with lightning arrester leakance, the second coil winding 711
Input terminal is electrically connected with an output terminal of the power amplifier 8, another output terminal and the circuit of the power amplifier 8
Acquisition module 9 is electrically connected, magnetic flux density direction caused by the second coil winding 711 and the first coil winding 710
Magnetic flux density direction it is opposite.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The precision electromagnetic sensor 72 includes the diskette 720 of an arc-shaped arrangement
The data contacts 721 being connected on the diskette 720, the power amplifier 8 include one and 721 output terminal of data contacts
The operational amplifier 80 of electrical connection, one first triode 81, one second triode 82 and an input power 83, the described 1st
The collector of pole pipe 81 is electrically connected to the positive interface 830 of the input power 83, the collector connection of second triode 82
In the negative interface 831 of the input power 83, the output terminal of the power amplifier 8 is divided into two-way, is connected to described all the way
The base stage of one triode 81, another way are connected to the base stage of second triode 82, the amplifying stage of first triode 81
It is divided into two-way, is connected to the input terminal of the second coil winding 711 all the way, another way is connected to second triode 82
Amplifying stage, the circuit acquisition module 9 include one end be connected to the measurement resistance R1 of 711 output terminal of second coil winding with
And for measuring the ammeter A of current values in the measurement resistance, the other end ground connection of the measurement resistance R1.When arrester leaks
The magnetic field that the direct current signal of electric current produces after first coil winding 710 in magnetic core 71 is focused into precision electromagnetic sensing
On device, the voltage signal that precision electromagnetic sensor produces is acted on through power amplifier conducting so that being produced in second coil winding anti-
To compensation electric current, the magnetic flux that compensation electric current produces is with flow direction caused by arrester leakage current on the contrary, when the two is realized
After magnetic balance, core flux zero, electric current is compensated in second coil winding again after the test of oversampling circuit acquisition module, that is, is drawn
The direct current signal value of leakage current of an arrester, thus one aspect of the present invention is that lightning arrester leakance is adopted using contactless
Collection, thereby may be ensured that collecting unit can effectively and stably be run in complex electromagnetic fields, not only voltage endurance capability obtains
To greatly being lifted, and can have stronger self- recoverage and adaptive ability under overvoltage.Another aspect of the present invention can be with
Online acquisition is carried out to the faint circuit signal of the microampere order of magnitude, and direct current can be monitored at any time by central monitoring device and taken shelter from the thunder
The change of leakage current, harmonic wave and electrostatic etc. in device, can effectively prevent lightning protection telecommunications or electric and electronics board etc. from setting
It is standby to influence the earthing effect of lightning stroke because grounding resistance is excessive, effectively prevent to cause damage and the injures and deaths of building and people and animals,
And be conducive to extend the service life of arrester.The present embodiment also utilizes diskette to be used for isolation detection for core sensing element
The modular product of electric current, its operation principle is to use magnetic balance type principle, i.e., when electric current flows through the straight wire of a root long,
Magnetic field is produced around conducting wire, the size in magnetic field is directly proportional to the size of current for flowing through conducting wire, this magnetic field can pass through soft magnetism
Material is assembled, and is then detected with diskette, due to the change in magnetic field and the output voltage signal of diskette have it is good
Linear dependence, therefore the output signal measured using diskette, directly reflect the size of current in conducting wire, and diskette
Advantage be its strong anti-interference ability, low temperature floats and high sensitivity, particularly electric current for -1A to 1A electric currents model
In enclosing, diskette shows good symmetry and sensitivity in terms of magnetic flux density.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The toroidal shell 70 includes a shield shell 701 and is arranged at the shielding
The insulation shell 702 in the outside of housing 701, the magnetic core 71 include two symmetrically arranged 714 and one fixing pipes of arc pellet
715, two arc pellets 714 are respectively mutually abutted with one end, and pass through 715 sets of the fixing pipe in the both sides of the abutted position
On, the arc pellet 714 is arc pellet 714 made of nano amorphous material, and the fixing pipe 715 is nano amorphous material
Fixing pipe 715.Current sensor is made of nano amorphous material, diskette, nano amorphous material fixing pipe and shielding shell.For
Facilitate installation, nano amorphous material made HALF structures by us.Fixation is used after nano amorphous material installs
Pipe is fixed, to ensure that the material can be docked preferably sensor at work.The present invention is fully examined when selecting magnetic material
The problem of having considered heavy current impact.So we select nano amorphous and magnetic core material of the amorphous soft magnet as current sensor
Material.Amorphous soft magnet and nano amorphous material have good recovery capability, can be very after the heavy current impact of moment is born
Good recovery.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The both ends of the diskette 720 are respectively connected to the one of an arc pellet 714
End, volume occupied by the diskette 720 are a quarter of 700 volume of accommodating space, shared by the fixing pipe 715
According to volume be 700 volume of accommodating space a quarter, in the arc pellet 714 of 715 side of fixing pipe
The a quarter that the volume occupied by the part of fixing pipe 715 is 700 volume of accommodating space is not put on, positioned at the fixation
It is the accommodating space 700 not put on the volume occupied by the part of fixing pipe 715 in the arc pellet 714 of 715 opposite side of pipe
The a quarter of volume, the second coil winding 711 include upper second coil around portion and lower second coil around portion, it is described on
Second coil is set around the part for not putting on fixing pipe 715 in the arc pellet 714 of 715 side of fixing pipe around portion,
Lower second coil is set around around portion does not put on fixing pipe 715 in the arc pellet 714 of 715 opposite side of fixing pipe
Part, upper second coil is electrically connected to each other around portion and lower second coil around portion, and the first coil winding 710 is set around
The outside of the fixing pipe 715.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.Added in the extraction wire of the arrester electric current inert-gas diode with
And TVS diode, TVS diode differential concatenation ground connection.The present embodiment all lead-in conductors, extraction wire and other have must
Installation inert-gas diode and TVS diodes, which may be selected, in the part wanted prevents high current from destroying circuit system.Due to
The TVS diodes startup time is fast, but the continuous capability that discharges is poor；And the startup time of inert-gas diode is slow, electric discharge is held
Continuous ability is strong.So both uses at the same time can be good at solving the problems, such as circuit protection.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.AC signal is loaded with the diskette 720 and/or magnetic core 71.By
After upper AC signal is loaded on diskette, the magnetic flux density of diskette will magnetize and demagnetize back and forth in forward and reverse, at this
A process can interrupt magnetic polarization process of the external electromagnetic field to magnetic material.So it can be very good to avoid the magnetic pole of magnetic material
Change.Be conducive to improve the accuracy of detection and service life of the present invention.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The toroidal shell 70 be set on the ground wire 16 of arrester and it include can
The left shell half body 705 and right half-shell body 706 mutually dismantled.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.When arrester leakage current direct current signal after first coil winding in magnetic
The magnetic field produced in core is focused on diskette, and diskette will produce voltage, soft magnetism after sensing this part magnetic flux density
Amplification of the voltage signal through operational amplifier that piece produces completes the control of discharge to input power so that input power
Positive interface to exporting Contrary compensation electric current in second coil winding, the magnetic flux and arrester leakage current institute that compensation electric current produces
The flow direction of generation makes magnetic flux density in magnetic core all the time on the contrary, by control of the operational amplifier to Contrary compensation electric current
For definite value, electric current is compensated in second coil winding at this time and is input to ground after measured resistance R1 again, passes through ammeter pair
The current values of circulation in resistance R1 are measured, and carries out scale operation according to the current values and draws leakage current of an arrester
Direct current signal value, not only circuit structure is simple for above detection process, manufacturing cost is low, but also detection accuracy is high, can ensure
Signal detection precision.
Further, since complicated electromagnetic field to magnetic material in addition to it can cause the influence of magnetic polarization, it is also possible to influence electricity
The steady operation of sub-circuit.So the present invention can also realize electromagnetic isolation in terms of wire laying mode, structure design and shell processing,
The functions such as decoupling filtering, so as to enable a system to long-time steady operation.By setting shield shell and insulation shell, be conducive to
Reduce the magnetic flux leakage of magnetic core, accordingly improve measurement accuracy, at the same also can effective shield perimeter electromagnetic field interference, reduce measurement
Error.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The online detecting of the corresponding UHVDC Arrester leakage current of the present embodiment
Method, comprises the following steps：
A, judge whether to carry out signal acquisition, when arrester electric current is higher than threshold value set in advance, bis- poles of TVS to electric current
Pipe can be actuated for release current rapidly, and inert-gas diode is started afterwards, sustained release electric current.
B, signal acquisition is carried out to electric current, when the direct current signal of arrester leakage current is after first coil winding 710
The magnetic field produced in magnetic core 71 is focused on precision electromagnetic sensor 72, the voltage signal that precision electromagnetic sensor 72 produces
Acted on through 8 conducting of power amplifier and to produce Contrary compensation electric current in second coil winding 711, the magnetic flux that compensation electric current produces
With arrester leakage current caused by flow direction on the contrary, after realizing magnetic balance both, 71 magnetic flux of magnetic core is zero, the second line
On circle winding 711 compensation electric current draws the direct current signal of leakage current of an arrester again after the test of oversampling circuit acquisition module 9
Value is hence into next step.More specifically, when arrester leakage current direct current signal after first coil winding 710
The magnetic field produced in magnetic core 71 is focused on diskette 720, and diskette 720 will produce after sensing this part magnetic flux density
Voltage, amplification of the voltage signal through operational amplifier 80 that diskette 720 produces complete the electric discharge to input power 83
Control so that the positive interface 830 of input power 83 is produced to output Contrary compensation electric current in second coil winding 711, compensation electric current
Raw magnetic flux is with flow direction caused by arrester leakage current on the contrary, by operational amplifier 80 to Contrary compensation electric current
Control, it is always definite value to make the magnetic flux density in magnetic core 71, compensates electric current measured electricity again in second coil winding 711 at this time
Be input to ground after resistance R1, by ammeter A to the current values that circulate in measurement resistance R1, and according to the current values into
Row scale operation is the direct current signal value for drawing leakage current of an arrester, hence into next step.
C, the output of electric current Value Data is formed after the signal of collection is handled.
D, the current data of acquisition is collected by being wirelessly transmitted in central monitoring device, data processing unit 11
After being handled by data operation, by public network signal transmitter unit 5 by the direct current signal value containing leakage current of an arrester, survey
The coding of amount time or arrester installation site information is sent to public network signal receiving unit 6 in the form of short message.
E, central monitoring device shows that current data distribution is sent to corresponding arrester management by the current data at the same time
The mobile terminal 3 of person, is specially after background processor 40 receives the short message of coding form, to change, will encode into row information
Information is converted into Chinese information and is sent on the mobile terminal 3 of related management personnel or maintenance personal, and in holder 41 forever
Kubo deposits above- mentioned information.
In addition, running through whole on-line checking process, have to being loaded with exchange on the diskette 720 and/or magnetic core 71
Signal, on diskette 720 and/or magnetic core 71 in loading after AC signal, the magnetic flux of diskette 720 and/or magnetic core 71 is close
Degree will magnetize and demagnetize back and forth in forward and reverse, and magnetic polarization of the external electromagnetic field to magnetic material can be interrupted in this process
Journey.
With reference to Fig. 5.The testing principle of the present invention specifically includes：Electric current I1 and I2 are produced on two windings respectively
The opposite magnetic flux density of B1 and B2 both directions, the two magnetic flux densities cancel each other in precision electromagnetic sensing station.So
The magnetic field collected afterwards according to precision electromagnetic sensor adjusts the size of I2, and to make B1+B2 be definite value.Then I2 is measured
Stool and urine be known that the size of I1.The core of part of data acquisition is precision electromagnetic sensor.The applicant is by grinding
Study carefully investigation, magnetic field acquisition method can use hall device, but hall device nonlinear degree is larger, antijamming capability pole
It is weak, low to small-signal sensitivity, so can not be used in the UHVDC Arrester equipment.Therefore, in the present embodiment,
Magnetic field collector uses special soft magnetic materials, and the advantage of soft magnetic materials is its strong anti-interference ability, low temperature float with it is highly sensitive
Degree.
With reference to Fig. 6.As seen from Figure 6, diskette is in the range of electric current is -1A to 1A electric currents, in magnetic flux density
Aspect shows good symmetry and sensitivity.
With reference to Fig. 7.Fig. 7 is the temperature drift curve of soft magnetic materials and Hall sensor.In the figure 7 we can see that
Soft magnetic materials temperature drift at -40 degrees Celsius to 100 degrees Celsius is very small, this explanation soft magnetic materials can be more severe
In the environment of work.Within the temperature range of -40 degrees Celsius to 100 degrees Celsius, current acquisition is made using soft magnetic materials
During device, error will be less than 2%.
With reference to Fig. 8.Fig. 8 is the situation to diskette loading AC signal.Submitted as can be seen that being loaded on diskette
After flowing signal, the magnetic flux density of diskette will magnetize and demagnetize back and forth in forward and reverse, and outside can be interrupted in this process
Magnetic polarization process of the electromagnetic field to magnetic material.So it can be very good to avoid the magnetic polarization of magnetic material.
In addition, the soft magnetic materials used in the present embodiment experiment is the NS358 materials provided by former Shanghai Steel and Iron Research Institute
Material, but repeatedly tested by the applicant, diskette can also complete this item application made from other kinds of soft magnetic materials
Purpose.And nano amorphous material is provided by magnetisable material and device key lab of the Chinese Academy of Sciences.Also pass through the application
People repeatedly tests, and magnetic core can also complete the purpose of this item application made from other kinds of nano amorphous material.
Embodiment two
The present embodiment and the embodiment of embodiment one are substantially the same, its difference is：The data sending device
Including in sequentially connected emission of radio frequency signals unit 50, frequency modulation retransmission unit 51 and dual mode communication unit 52, the data
Reception device is the public network signal receiving unit 6 being connected with the output terminal of the dual mode communication unit 52.
It can cause the present embodiment both can be in the range of having had public network covering by electric circuit inspection numerical value using above-mentioned setting
Central monitoring device is transferred to, the emission of radio frequency signals unit and frequency modulation can also be passed through in the region of no public network signal
Lightning strike information, is first dealt into the dual mode communication unit being arranged in public network coverage, passed again afterwards by the cooperation of retransmission unit
It is defeated to arrive central monitoring device, the applicable situation of the present invention can be so widened significantly so that be located in some remote mountains or thick forest
Direct current arrester can also real-time online detect the information of its leakage current.
The present embodiment can be automatically selected in frequency range by the cooperation of emission of radio frequency signals unit and frequency modulation retransmission unit
The farthest frequency point of propagation distance launches the current data collected, can overcome the single frequency point propagation distance too short
Defect so that applicable situation of the invention is broader.
Further, since the present embodiment is otherwise varied for data sending device and embodiment one, thus the present embodiment is to spy
The online method for detecting of high voltage direct current arrester leakage circuit is also different, its difference is：
On the one hand, step d includes data processing unit after data operation processing, will contain leakage current of an arrester
Direct current signal value, the coding of time of measuring or arrester installation site information passes through emission of radio frequency signals unit and frequency modulation turns
The cooperation of bill member, ensure communication channel it is unimpeded in the case of, coding information is passed through in a manner of private network automatic frequency-hopping
Level-one is forwarded on the bimodulus communication unit of mobile public network signal coverage areas, then again by bimodulus communication unit with short message
Form is sent to public network signal receiving unit.
On the other hand, after step e receives the short message of coding form including background processor, changed into row information, will
Coding information is converted into Chinese information and is sent on the mobile terminal of related management personnel or maintenance personal, and in holder forever
Kubo deposits above- mentioned information.
The embodiment of the present invention is above are only, but the design concept of the present invention is not limited thereto, it is all to utilize this
Conceive the change that unsubstantiality is carried out to the present invention, the behavior for invading the scope of the present invention should all be belonged to.
Claims (5)
1. with non-contact sensor to the detection device of UHVDC Arrester leakage current, it is characterised in that：Including data
Collecting unit, data processing unit, protection circuit unit and power supply unit, the data acquisition unit include current sense
Device, power amplifier and circuit acquisition module, the current sensor include a toroidal shell, the magnetic core of a C-shaped arrangement
And a precision electromagnetic sensor, an accommodating space is provided with the toroidal shell, rotating around equipped with one on the magnetic core
One coil windings and a second coil winding, and the magnetic core is installed in the accommodating space, the precision electromagnetic sensing
Device is also installed in the accommodating space and its both ends and the both ends of the magnetic core and abuts, the input of the first coil winding
End is electrically connected with lightning arrester leakance, and the input terminal of the second coil winding and an output terminal of the power amplifier are electrically connected
Connect, another output terminal of the power amplifier is electrically connected with the circuit acquisition module, produced by the second coil winding
Magnetic flux density direction it is opposite with the magnetic flux density direction of the first coil winding；The toroidal shell includes a shield shell
And the insulation shell on the outside of the shield shell is arranged at, the magnetic core is solid including two symmetrically arranged arc pellets and one
Fixed tube, two arc pellets are respectively mutually abutted with one end, and are socketed in the both sides of the abutted position by the fixing pipe,
The arc pellet is arc pellet made of amorphous soft magnetic material, and the fixing pipe is amorphous soft magnet fixing pipe；The annular
Housing is set on the ground wire of arrester and it includes the left shell half body and right half-shell body that can mutually dismantle；The detection dress
Put and further include a collection protection module, the electric energy output end of the power supply unit is divided into four tunnels, is electrically connected in protection circuit
At the electrical energy inputs of unit, the electrical energy inputs for gathering protection module, the electrical energy inputs of data acquisition unit and data
The electrical energy inputs of unit are managed, the output terminal of arrester electric current is divided into two-way, is connected to making for the data acquisition unit all the way
Energy end, another way are connected to the Enable Pin of the collection protection module, and the output terminal for gathering protection module is connected to described
The Enable Pin of circuit unit is protected, the Enable Pin of the data processing unit is equipped with two-way, connects the data acquisition list all the way
The output terminal of member, the output terminal of the another way connection protection circuit unit, when arrester electric current is less than or equal to 1 milliampere hour,
Collection protection module is failure to actuate, and data acquisition unit starts and passes through by data after carrying out signal acquisition and data processing to electric current
Processing unit exports；When arrester electric current is more than 1 milliampere hour, data acquisition unit is motionless, and gathers protection module startup, described
High-impedance state is presented to input in detection device, at this time without signal acquisition and data processing, and is exported via data processing unit.
2. the detection device with non-contact sensor to UHVDC Arrester leakage current as claimed in claim 1, it is special
Sign is：Diskette of the precision electromagnetic sensor including an arc-shaped arrangement is connected to the data contacts on the diskette,
The power amplifier includes an operational amplifier being electrically connected with the data contacts output terminal, one first triode, one the
Two triodes and an input power, the collector of first triode are electrically connected to the positive interface of the input power, institute
The collector for stating the second triode is connected to the negative interface of the input power, and the output terminal of the power amplifier is divided into two
Road, is connected to the base stage of first triode all the way, and another way is connected to the base stage of second triode, and the described 1st
The amplifying stage of pole pipe is divided into two-way, is connected to the input terminal of the second coil winding all the way, and another way is connected to described second
The amplifying stage of triode, the circuit acquisition module include the measurement resistance that one end is connected to the second coil winding output terminal
R1 and the ammeter for measuring current values in the measurement resistance, the other end ground connection of the measurement resistance R1.
3. the detection device with non-contact sensor to UHVDC Arrester leakage current as claimed in claim 1, it is special
Sign is：Inert-gas diode and TVS diode are added in the extraction wire of the arrester electric current, bis- poles of TVS
Pipe differential concatenation is grounded.
4. the detection device with non-contact sensor to UHVDC Arrester leakage current as claimed in claim 3, it is special
Sign is：AC signal is loaded with the diskette and/or magnetic core.
5. the detection device with non-contact sensor to UHVDC Arrester leakage current as claimed in claim 1, it is special
Sign is：The input terminal of the first coil winding adds inert-gas diode and TVS diode, the TVS diode
Differential concatenation is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510610641.3A CN105182043B (en) | 2015-09-23 | 2015-09-23 | Detection device with non-contact sensor to UHVDC Arrester leakage current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510610641.3A CN105182043B (en) | 2015-09-23 | 2015-09-23 | Detection device with non-contact sensor to UHVDC Arrester leakage current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105182043A CN105182043A (en) | 2015-12-23 |
| CN105182043B true CN105182043B (en) | 2018-05-11 |
Family
ID=54904260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510610641.3A Active CN105182043B (en) | 2015-09-23 | 2015-09-23 | Detection device with non-contact sensor to UHVDC Arrester leakage current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105182043B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016205101A1 (en) * | 2016-03-29 | 2017-10-05 | Siemens Aktiengesellschaft | Differential current sensor |
| CN111710490B (en) * | 2020-06-19 | 2021-10-22 | 中国科学技术大学 | C-shaped nonlinear impact magnet with built-in ceramic vacuum chamber |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001264360A (en) * | 2000-03-16 | 2001-09-26 | Sumitomo Special Metals Co Ltd | Dc current detector |
| US6420862B2 (en) * | 2000-02-14 | 2002-07-16 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | System and method of locating lightning strikes |
| CN1547035A (en) * | 2003-12-12 | 2004-11-17 | 华中科技大学 | Current sensor |
| CN1670536A (en) * | 2004-03-17 | 2005-09-21 | 四川康姆逊电磁防护有限责任公司 | Lightning stroke detection and warning system |
| CN202126472U (en) * | 2011-05-31 | 2012-01-25 | 江苏省电力公司连云港供电公司 | Leakage current online monitoring device for zinc oxide arrester based on wireless synchronous techniques |
| CN103364612A (en) * | 2013-07-05 | 2013-10-23 | 华中科技大学 | Dual-Hall element current sensor |
| CN203632360U (en) * | 2013-12-09 | 2014-06-04 | 南京紫峰电力设备有限公司 | Wireless network lightning arrester intelligent monitoring system |
| CN205103296U (en) * | 2015-09-23 | 2016-03-23 | 厦门红相电力设备股份有限公司 | Detection apparatus for reveal electric current with non - contact pick up to special high voltage direct current arrester |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004228176A (en) * | 2003-01-21 | 2004-08-12 | Fuji Electric Holdings Co Ltd | Zero-phase current transformer |
| EP2333925B1 (en) * | 2009-12-08 | 2013-02-13 | Raychem International | Surge arrester condition monitoring |
| CN203455390U (en) * | 2013-09-23 | 2014-02-26 | 珠海众锐科技有限公司 | An openable DC leakage current sensor |
| CN203479959U (en) * | 2013-10-10 | 2014-03-12 | 泉州维盾电气有限公司 | Lightning stroke positioning system disposed on power transmission line power |
-
2015
- 2015-09-23 CN CN201510610641.3A patent/CN105182043B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6420862B2 (en) * | 2000-02-14 | 2002-07-16 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | System and method of locating lightning strikes |
| JP2001264360A (en) * | 2000-03-16 | 2001-09-26 | Sumitomo Special Metals Co Ltd | Dc current detector |
| CN1547035A (en) * | 2003-12-12 | 2004-11-17 | 华中科技大学 | Current sensor |
| CN1670536A (en) * | 2004-03-17 | 2005-09-21 | 四川康姆逊电磁防护有限责任公司 | Lightning stroke detection and warning system |
| CN202126472U (en) * | 2011-05-31 | 2012-01-25 | 江苏省电力公司连云港供电公司 | Leakage current online monitoring device for zinc oxide arrester based on wireless synchronous techniques |
| CN103364612A (en) * | 2013-07-05 | 2013-10-23 | 华中科技大学 | Dual-Hall element current sensor |
| CN203632360U (en) * | 2013-12-09 | 2014-06-04 | 南京紫峰电力设备有限公司 | Wireless network lightning arrester intelligent monitoring system |
| CN205103296U (en) * | 2015-09-23 | 2016-03-23 | 厦门红相电力设备股份有限公司 | Detection apparatus for reveal electric current with non - contact pick up to special high voltage direct current arrester |
Non-Patent Citations (1)
| Title |
|---|
| 霍尔电流传感器及其自动调测系统的设计;齐冬梅;《中国优秀硕士学位论文全文数据库 信息科技辑》;20111215(第S2期);第8页倒数第1段-第27页到数第1段，以及图2-5 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105182043A (en) | 2015-12-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105158543B (en) | Based on double Hall elements to the collecting unit of UHVDC Arrester leakage current | |
| CN105182044B (en) | Using device of the Hall sensor as framework to UHVDC Arrester state-detection | |
| CN105182163B (en) | The online detecting system of UHVDC Arrester leakage current based on cloud | |
| CN103293443B (en) | A kind of distribution network overhead line Earth design method | |
| CN105467241B (en) | A kind of distribution converter transformer DC magnetic bias detecting system and its detection method | |
| CN106771840A (en) | A kind of dry type hollow reactor interturn short circuit fault online test method | |
| CN105158643A (en) | Remote control detecting device for corrosion state of grounding grid horizontal voltage-sharing conductor of substation | |
| CN105301323B (en) | The method that UHVDC Arrester Leakage Current is detected online using cloud | |
| CN205103292U (en) | Acquisition unit based on two hall element reveal electric current to special high voltage direct current arrester | |
| CN105182183A (en) | Method for remotely detecting corrosion state of horizontal voltage equalizing conductor of transformer substation grounding grid | |
| CN103389408A (en) | High-voltage single-core cable sheath grounding current on-line monitoring device and control method | |
| CN205103296U (en) | Detection apparatus for reveal electric current with non - contact pick up to special high voltage direct current arrester | |
| CN104090173B (en) | The distributed field strength measurement system and method for a kind of multinode based on Bluetooth communication | |
| CN105182043B (en) | Detection device with non-contact sensor to UHVDC Arrester leakage current | |
| CN105158633B (en) | The method of UHVDC Arrester state on-line checking data is shared with cloud platform | |
| CN105301325B (en) | With hall sensing theory to the method for UHVDC Arrester leakage current collection | |
| CN205103356U (en) | Use soft -magnetic piece as core to faint acquisition unit who reveals current signal of non -contact | |
| CN205103294U (en) | Use device that hall sensor detected special high voltage direct current arrester state as framework | |
| CN204925306U (en) | System that listens on line of electric current is revealed to special high voltage direct current arrester based on cloud | |
| Cui et al. | WSN-based measurement of ion-current density under high-voltage direct current transmission lines | |
| CN105301324B (en) | With magnetic balance theory to the method for UHVDC Arrester leakage current collection | |
| CN207964994U (en) | Grounding net of transformer substation health status detection device | |
| CN204925224U (en) | Use special high voltage direct current arrester state to detect big data platform of data as framework | |
| CN105182045B (en) | Big data platform using UHVDC Arrester state-detection data as framework | |
| CN205103293U (en) | Be applied to special high voltage direct current arrester and reveal current detection's sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: Nantou Road, Siming District of Xiamen city in Fujian province 361001 No. 3 unit of 1002 Applicant after: Red phase Limited by Share Ltd Address before: Unit E 21 layer ocean light No. 33 building, 361001 Xiamen Road, Siming District, Narcissus in Fujian Province Applicant before: Xiamen Red Phase Instruments Inc. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |