CN105182163B - The online detecting system of UHVDC Arrester leakage current based on cloud - Google Patents
The online detecting system of UHVDC Arrester leakage current based on cloud Download PDFInfo
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- CN105182163B CN105182163B CN201510610702.6A CN201510610702A CN105182163B CN 105182163 B CN105182163 B CN 105182163B CN 201510610702 A CN201510610702 A CN 201510610702A CN 105182163 B CN105182163 B CN 105182163B
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Abstract
The online detecting system of UHVDC Arrester leakage current based on cloud, including a detection device, data sending device, data sink, central monitoring device and mobile terminal, the detection device includes data acquisition unit, data processing unit, protect circuit unit and power supply unit, the data acquisition unit includes current sensor, power amplifier and circuit acquisition module, the current sensor includes a toroidal shell, one magnetic core and two Hall circuit modules, rotating around equipped with a first coil winding and a second coil winding on magnetic core, magnetic flux density direction caused by second coil winding is opposite with the magnetic flux density direction of the first coil winding.The present invention can carry out online acquisition to the faint circuit signal of the microampere order of magnitude, and depend on cloud and can monitor the change of leakage current in direct current arrester, harmonic wave and electrostatic etc. at any time by central monitoring device.
Description
Technical field
The present invention relates to UHVDC Transmission Lines arrester state inspection, refers in particular to a kind of spy based on cloud
The online detecting system 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.A kind of inspection for being directed to UHVDC Arrester leakage current is particularly needed in a hurry
Survey device and detection method.
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 a kind of online detecting system of the UHVDC Arrester leakage current based on cloud, it is led
UHVDC Arrester leakage current can not be stablized and accurate by aiming to overcome that existing leakage current alarm system
Really the defects of detection.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
The online detecting system of UHVDC Arrester leakage current based on cloud, including one be arranged at direct current and keep away
The data sending dress that detection device near thunder device, the leakage current testing result for the detection device to be obtained are transmitted
Put, data sink, central monitoring device and mobile terminal, the Enable Pin of the data sink are connected to the number
According to the output terminal of dispensing device, the Enable Pin of the central monitoring device is connected to the output terminal of the data sink, institute
State output terminal connection and the Enable Pin of the mobile terminal of central monitoring device；The detection device includes data acquisition list
Member, data processing unit, protection circuit unit and power supply unit, the data acquisition unit include current sensor, power
Amplifier and circuit acquisition module, the current sensor include a toroidal shell, a C-shaped arrangement magnetic core and two suddenly
Your circuit module, is provided with an accommodating space in the toroidal shell, rotating around equipped with a first coil winding on the magnetic core
And a second coil winding, and the magnetic core is installed in the accommodating space, and the two Hall circuit modules are installed in institute
State in accommodating space and its both ends and the both ends of the magnetic core to abut, an electricity is connected between the two Hall circuit modules
Bridge, the input terminal of the first coil winding are electrically connected with lightning arrester leakance, the input terminal of the second coil winding and institute
The output terminal for stating power amplifier is electrically connected, and another output terminal of the power amplifier is electrically connected with the circuit acquisition module
Connect, magnetic flux density direction caused by the second coil winding is opposite with the magnetic flux density direction of the first coil winding.
Further, each Hall circuit module includes a Hall element and be in series with the Hall element one
Resistance is adjusted, the control current terminal of the Hall circuit module is in parallel to be accessed in DC constant flowing power an I+ and I-, and two institutes
The output terminal data contacts that also parallel connection is VH+ and VH- of Hall circuit module are stated, the power amplifier includes one and the number
Operational amplifier, one first triode, one second triode and the input power being electrically connected according to contact output terminal, described the
The collector of one triode is electrically connected to the positive interface of the input power, and the collector of second triode is connected to described
The negative interface of input power, the output terminal of the power amplifier are divided into two-way, are connected to the base of first triode all the way
Pole, another way are connected to the base stage of second triode, and the amplifying stage of first triode is divided into two-way, is connected to all the way
The input terminal of the second coil winding, another way are connected to the amplifying stage of second triode, the circuit acquisition module
The measurement resistance R1 of the second coil winding output terminal is connected to including one end and for measuring electric current in the measurement resistance
The ammeter of numerical value, the other end ground connection of the measurement resistance R1.
Further, the electric bridge includes two resistance pair being arranged in parallel, and the contact of the side of two resistance pair is connected to
Hall element is connected to the connecting part among adjustment resistance, the contact of the opposite side of two resistance pair in one Hall circuit module
Hall element and the connecting part among adjustment resistance, the two each resistance of resistance centering being arranged in parallel in another Hall circuit module
To respectively including two resistance being arranged in series, and wherein the centre for the resistor wiring that a resistance centering two is arranged in series with it is another
The intermediate electrical for the resistor wiring that resistance centering two is arranged in series connects.
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 opening of the magnetic core is formed with an air gap, the two Hall circuit module parallel arranged for interval
In in the air gap, the volume occupied by the fixing pipe is a quarter of the accommodating space volume, positioned at the fixing pipe
It is 1/3rd of the accommodating space volume not put on the volume occupied by the part of fixing pipe in the arc pellet of side, position
It is the accommodating space body not put on the volume occupied by the part of fixing pipe in the arc pellet of the fixing pipe opposite side
Long-pending 1/3rd, the second coil winding include upper second coil around portion and lower second coil around portion, and described upper second
Coil is set around the part for not putting on fixing pipe in the arc pellet of the fixing pipe side, lower second coil around portion
Be set around the part for not putting on fixing pipe in the arc pellet of the fixing pipe opposite side around portion, upper second coil around
Portion and lower second coil are electrically connected to each other around portion, and the first coil winding is set around the outside of the 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, and is loaded with AC signal on the magnetic core, the toroidal shell is set in the ground of arrester
On line and it includes the left shell half body and right half-shell body that can mutually dismantle.
Further, the central monitoring device includes background processor and holder, the background processor it is defeated
Enter end and be connected to the data sink, the output terminal of the background processor be connected to the mobile terminal and on
Holder is stated, the input terminal of the background processor is also associated with an encryption unit, and the output terminal of the holder is connected with one
Terminal display.
Further, the data sending device is public network signal transmitter unit, and data sink connects for public network signal
Receive unit.
Further, the data sending device includes single in sequentially connected emission of radio frequency signals unit, frequency modulation forwarding
Member and dual mode communication unit, the data sink are that the public network signal being connected with the output terminal of the dual mode communication unit connects
Receive unit.
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 into the two Hall circuit modules, due to the position of the two Hall circuit module
Difference is put, thus produces unequal Hall voltage, the two Hall circuit modules are connected according to electricity in parallel via circuit in parallel
After the equivalent circuit synthesis of appearance, the output valve for the voltage signal that the two Hall circuit modules produce is defeated for two Hall circuit modules
Go out the arithmetic mean of instantaneous value of value, the output valve of the voltage signal is acted on through power amplifier conducting so that being produced in second coil winding
Contrary 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 real
After existing magnetic balance, core flux zero, compensates electric current again after the test of oversampling circuit acquisition module, in second coil winding to obtain the final product
Go out the direct current signal value of leakage current of an arrester, thus one aspect of the present invention is that lightning arrester leakance is carried out 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
Greatly lifted, and can have stronger self- recoverage and adaptive ability under overvoltage.Another aspect of the present invention is
Have and two Hall circuit modules be set, like this Hall element in this two Hall circuit module can be connected into two kinds it is defeated
Go out form, a kind of is the arithmetic mean of instantaneous value form that the output of sensor is two single Hall output, this kind of method is suitable for closed loop
Hall current sensor pattern, it can considerably reduce the nonlinearity of sensor and site error, improve sensor
Antijamming capability and range ability.Another kind is the sensor that two Halls coordinate certain component composition, its output is poor
Form-separating.This kind of double Hall current sensor schemes can suppress temperature drift and common mode interference from signal source, improve
The stability and the linearity of current sensor, and the feature with self compensation and linearity correction, can be to the micro- of the microampere order of magnitude
Weak circuit signal carries out online acquisition, and can monitor leakage current in direct current arrester, harmonic wave at any time by central monitoring device
And the change of electrostatic etc., it can effectively prevent the equipment such as lightning protection telecommunications or electric and electronics board because of grounding resistance mistake
Height, influences the earthing effect of lightning stroke, effectively prevents to cause damage and the injures and deaths of building and people and animals, and be conducive to extension and keep away
The service life of thunder device.
2nd, in the present invention, maintenance personal can be in time by the central monitoring device with short message or other shapes
Formula knows the relevant information of direct current arrester leakage current, so as to both avoid maintenance personnel from frequently patrolling arrester in bad weather
Trouble point, reduces the risk that maintenance personal gets an electric shock, and reduces the time recovered needed for line powering.
3rd, in the present invention, it is used for the modularization of isolation detection electric current for core sensing element by using double Hall elements
Product, since Hall element can produce Hall effect in itself, thus its operation principle is to use magnetic balance type principle, that is, is worked as
When electric current flows through the straight wire of a root long, produce magnetic field around conducting wire, the size in magnetic field and flow through the size of current of conducting wire into
Direct ratio, this magnetic field can be assembled by Hall element, be then detected with double Hall elements, due to magnetic field change with
The output voltage signal of double Hall elements has good linear dependence, therefore the output signal measured using double Hall elements,
The size of current in conducting wire is directly reflected, and the advantage of double Hall elements is its accuracy higher, and response is faster, warm
Float small, particularly under complicated electric field environment, double Hall elements have stronger diamagneticization and anti-polarized characteristic, thus can be with
Realize the accurate and stably measured of alternating current and direct current, pulse signal etc..
4th, in the present invention, by being loaded on magnetic core after AC signal, the magnetic flux density of magnetic core will positive and
Reversely magnetize and demagnetize back and forth, magnetic polarization process of the external electromagnetic field to magnetic core can be interrupted in this process.So can be fine
The magnetic polarization for avoiding magnetic core, be conducive to improve the present invention accuracy of detection and service life.
5th, 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.
6th, in the present invention, complicated electromagnetic field to magnetic core 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 realizes electromagnetic isolation, decoupling filtering by setting shield shell and insulation shell
Etc. function, so as to enable a system to long-time steady operation.And by setting above-mentioned 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.
7th, in the present invention, current sensor by nano amorphous material, double Hall elements, nano amorphous material fixing pipe and
Shell is shielded to form.In order to facilitate the installation of, nano amorphous material is made HALF structures by us.Installed in nano amorphous material
Fixed after finishing using fixing pipe, to ensure that the material can be docked preferably sensor at work.The present invention is in selection magnetic
During property material, the problem of having fully taken into account heavy current impact.So we select nano amorphous and amorphous soft magnet as electric current
The core material of sensor.Amorphous soft magnet and nano amorphous material have good recovery capability, are bearing the high current of moment
After impact, it can be very good to recover.
8th, the present invention both can in the range of having public network covering by electric circuit inspection data transfer to central monitoring device,
Can be in the region of no public network signal by the cooperation of the emission of radio frequency signals unit and frequency modulation retransmission unit, first by thunder
Hit information and be dealt into the dual mode communication unit being arranged in public network coverage, be transferred to central monitoring device again afterwards, so
The applicable situation of the present invention can be widened significantly so that the direct current arrester being located in some remote mountains or thick forest can also be real-time
The information of its leakage current is detected online.
9th, the present invention 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.
10th, in the present invention, when the direct current signal of arrester leakage current produces in magnetic core after first coil winding
Raw magnetic field is focused on double Hall elements, and voltage, double Halls will be produced after double hall sensings to this part magnetic flux density
Amplification of the voltage signal through operational amplifier that element produces completes the control of discharge to input power so that input electricity
The positive interface in source is to output Contrary compensation electric current in second coil winding, magnetic flux and arrester leakage current that compensation electric current produces
Caused flow direction makes the magnetic flux density in magnetic core begin on the contrary, by control of the operational amplifier to Contrary compensation electric current
Be eventually definite value, compensation electric current is input to ground after measured resistance R1 again in second coil winding at this time, passes through ammeter
To the current values to circulate in measurement resistance R1, and carry out scale operation according to the current values and draw 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, Neng Goubao
Demonstrate,prove 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 schematic block circuit diagram of two Hall circuit modules in the present invention.
Fig. 6 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 the UHVDC Arrester leakage current based on cloud, including one
It is arranged at the detection device 1 near direct current arrester, the leakage current testing result for the detection device 1 to be obtained is passed
Defeated data sending device, data sink, central monitoring device and mobile terminal 3.The data sending device is public affairs
Net signal transmitter unit 5, data sink are public network signal receiving unit 6.Public network signal transmitter unit 5 and public network signal connect
Mobile public network can be passed through by receiving unit 6（GSM network or GPRS network）Realize data transfer, public network signal receives in the present embodiment
The modem of 6 preferred GSM network of unit or GPRS network, 5 preferred GSM network of public network signal transmitter unit or GPRS nets
The communication module of network.The central monitoring device includes background processor 40 and holder 41, the background processor 40
Input terminal is connected to the data sink, and the output terminal of the background processor 40 is connected to the mobile terminal 3
And above-mentioned holder 41, the input terminal of the background processor 40 are also associated with an encryption unit 42, the holder 41
Output terminal is connected with a terminal display 43.The Enable Pin of the data sink is connected to the defeated of the data sending device
Outlet, the Enable Pin of the central monitoring device are connected to the output terminal of the data sink, the central monitoring device
Output terminal connection and the Enable Pin of the mobile terminal 3.By above-mentioned setting, maintenance personal can pass through the center in time
Monitoring device knows the relevant information of direct current arrester leakage current in the form of short message or others, so as to both avoid safeguarding
Personnel frequently patrol surge arrester failure point in bad weather, reduce the risk that maintenance personal gets an electric shock, and reduce and recover line powering institute
The time needed.
In the present embodiment, an online detecting system based on cloud can be built into, including passes through net connection
Cloud Server（As described central monitoring device）, cloud client（As described mobile terminal 3）With at least one measurement eventually
End（The detection device 1 being as arranged in each power grid on each UHVDC Arrester）.In the system normal operation, measurement
For terminal by net connection by data transfer to Cloud Server, cloud client obtains required measurement number from Cloud Server
According to the operation such as user inquires about measurement data by cloud client, shows, exporting, utilization, assessment, realizes conventional measurement
What amount technology can not be completed is pointed to coordination or the correlation measurement of the associated objects of Different field, so that when shortening measurement
Between, realize and multiple measuring terminals are carried out at the same time with real time monitoring and the long-range measurement to measurand, while be conducive to section's credit
Analysis and research thunder-strike phenomenon.
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, Fig. 4 and Fig. 5.The data acquisition unit 10 includes current sensor 7, power amplifier
8th, circuit acquisition module 9.
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.The current sensor 7 includes a toroidal shell 70, a C-shaped arrangement
71 and two Hall circuit module 72 of magnetic core, an accommodating space 700 is provided with the toroidal shell 70, on the magnetic core 71
Rotating around equipped with a first coil winding 710 and a second coil winding 711, and the magnetic core 71 is installed on the accommodating sky
Between in 700, the two Hall circuit modules 72 are installed in the accommodating space 700 and its both ends and the two of the magnetic core 71
End abuts, and is connected with an electric bridge 73 between two 72 modules of Hall circuit, the input terminal of the first coil winding 710 is with keeping away
Thunder device leakage current is electrically connected, and the input terminal of the second coil winding 711 and an output terminal of the power amplifier 8 are electrically connected
Connect, another output terminal of the power amplifier 8 is electrically connected with the circuit acquisition module 9, the institute of second coil winding 711
The magnetic flux density direction of generation is opposite with the magnetic flux density direction of the first coil winding 710.
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.Each Hall circuit module 72 include a Hall element 720 and
The adjustment resistance 722 being in series with the Hall element 720, the access in parallel of the control current terminal of the Hall circuit module 72 in
The I+ and I- of one DC constant flowing power 723, and the output terminal of the two Hall circuit modules 72 is also in parallel for VH+'s and VH-
Data contacts 721, the power amplifier 8 include an operational amplifier 80 being electrically connected with 721 output terminal of data contacts,
One first triode 81, one second triode 82 and an input power 83, the collector of first triode 81 are electrically connected
In the positive interface 830 of the input power 83, the collector of second triode 82 is connected to the negative of the input power 83
Interface 831, the output terminal of the power amplifier 8 are divided into two-way, are connected to the base stage of first triode 81 all the way, another
Road is connected to the base stage of second triode 82, and the amplifying stage of first triode 81 is divided into two-way, is connected to institute all the way
The input terminal of second coil winding 711 is stated, another way is connected to the amplifying stage of second triode 82, and the circuit gathers mould
Block 9 is connected to the measurement resistance R1 of 711 output terminal of second coil winding and for measuring the measurement resistance including one end
The ammeter A of interior current values, the other end ground connection of the measurement resistance R1.When the direct current signal of arrester leakage current passes through
The magnetic field produced after first coil winding in magnetic core is focused into the two Hall circuit modules, due to two Hall
The position of circuit module is different, thus produces unequal Hall voltage, and the two Hall circuit modules connect via circuit in parallel
After connecing the equivalent circuit synthesis according to shunt capacitance, the output valve of the voltage signal that the two Hall circuit modules produce for two suddenly
The arithmetic mean of instantaneous value of your circuit module output valve, the output valve of the voltage signal are acted on through power amplifier conducting so that the second line
Enclose and Contrary compensation electric current is produced on winding, the magnetic flux and flow direction phase caused by arrester leakage current that compensation electric current produces
Instead, after the two realizes magnetic balance, core flux zero, electric current is compensated in second coil winding again through oversampling circuit acquisition module
After test, that is, draw the direct current signal value of leakage current of an arrester, thus one aspect of the present invention is to lightning-arrest using contactless
Device leakage current is acquired, and 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.This hair
Bright another aspect is that have to set two Hall circuit modules, and like this Hall element in this two Hall circuit module is equal
Two kinds of output forms can be connected into, a kind of is the arithmetic mean of instantaneous value form that the output of sensor is two single Hall output, this kind of side
Method is suitable for closed-loop Hall current sensor pattern, it can considerably reduce the nonlinearity of sensor and site error, carry
The high antijamming capability and range ability of sensor.Another kind is the sensing that two Halls coordinate certain component composition
Device, its output is difference form.This kind of double Hall current sensor schemes can suppress temperature drift and be total to from signal source
Mould disturbs, and improves the stability and the linearity of current sensor, and the feature with self compensation and linearity correction, can be to micro-
The faint circuit signal of amperage magnitude carries out online acquisition, and can be monitored at any time in direct current arrester by central monitoring device
The change of leakage current, harmonic wave and electrostatic etc., can effectively prevent lightning protection telecommunications or electrically and the equipment such as electronics board because
Grounding resistance is excessive, influences the earthing effect of lightning stroke, effectively prevents 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 double Hall elements to be used for isolation detection for core sensing element
The modular product of electric current, since Hall element can produce Hall effect in itself, thus its operation principle is to use magnetic recording level
Weighing apparatus formula principle, i.e., when electric current flows through the straight wire of a root long, produce magnetic field, the size in magnetic field is with flowing through conducting wire around conducting wire
Size of current it is directly proportional, this magnetic field can be assembled by Hall element, be then detected with double Hall elements, due to
The change in magnetic field and the output voltage signal of double Hall elements have good linear dependence, therefore are measured using double Hall elements
Output signal, directly reflect the size of current in conducting wire, and the advantage of double Hall elements is its accuracy higher,
Faster, temperature drift is small for response, and particularly under complicated electric field environment, double Hall elements have stronger diamagneticization and resist polarized spy
Property, thus can realize the accurate and stably measured of alternating current and direct current, pulse signal etc..
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.The electric bridge 73 includes two resistance being arranged in parallel to 730 and resistance pair
731, which is connected to the contact of 731 side 730 and resistance Hall element 720 and tune in one Hall circuit module 72
Connecting part among whole resistance 722, the resistance are connected to another Hall circuit to 730 and resistance to the contact of 731 opposite side
Hall element 720 respectively includes two strings to 730 and resistance with the connecting part among adjustment resistance 722, resistance to 731 in module 72
Join the resistance 733 set, and resistance to the centres of two 733 wiring of resistance being arranged in series in 730 and another resistance in 731
The intermediate electrical of two 733 wiring of resistance being arranged in series connects.
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 6.The toroidal shell 70 includes a shield shell 701 and is arranged at this
The insulation shell 702 in the outside of shield shell 701, it is solid that the magnetic core 71 includes two symmetrically arranged arc pellets 714 and one
Fixed tube 715, two arc pellets 714 are respectively mutually abutted with one end, and pass through the fixing pipe 715 in the both sides of the abutted position
Put on, the arc pellet 714 is arc pellet 714 made of nano amorphous material, and the fixing pipe 715 is nano amorphous material
Expect fixing pipe 715.Current sensor is by nano amorphous material, double Hall elements, nano amorphous material fixing pipe and shielding shell
Form.In order to facilitate the installation of, nano amorphous material is made HALF structures by us.Make after nano amorphous material installs
Fixed with fixing pipe, to ensure that the material can be docked preferably sensor at work.The present invention when selecting magnetic material,
The problem of having fully taken into account heavy current impact.So we select nano amorphous and magnetic of the amorphous soft magnet as current sensor
Core material.Amorphous soft magnet and nano amorphous material have good recovery capability, can after the heavy current impact of moment is born
To recover well.
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.The opening of the magnetic core 71 is formed with an air gap 718, two Halls
72 parallel interval of circuit module is arranged in the air gap, and the volume occupied by the fixing pipe 715 is 700 body of accommodating space
Long-pending a quarter, does not put on occupied by the part of fixing pipe 715 in the arc pellet 714 of 715 side of fixing pipe
Volume be 700 volume of accommodating space 1/3rd, in the arc pellet 714 of 715 opposite side of fixing pipe
It is 1/3rd of 700 volume of accommodating space not put on the volume occupied by the part of fixing pipe 715, second coil
Winding 711 includes upper second coil and is set around around portion and lower second coil around portion, upper second coil around portion positioned at described
The part of fixing pipe 715 is not put in the arc pellet 714 of 715 side of fixing pipe, lower second coil is set around position around portion
The part of fixing pipe 715 is not put in the arc pellet 714 of 715 opposite side of fixing pipe, upper second coil is around portion
It is electrically connected to each other with lower second coil around portion, the first coil winding 710 is set around the outside of the fixing pipe 715.
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 6.Two pole of inert gas is added in the extraction wire of the arrester electric current
Pipe and TVS diode, TVS diode differential concatenation ground connection.The present embodiment all lead-in conductors, extraction wire and other
Installation inert-gas diode and TVS diodes, which may be selected, in the part being necessary prevents high current from destroying circuit system.By
It is fast in the TVS diodes startup time, but the continuous capability that discharges is poor；And the startup time of inert-gas diode is slow, put
Electric continuous capability 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, Fig. 4 and Fig. 5.AC signal is loaded with the magnetic core 71.By adding on magnetic core 71
In load after AC signal, the magnetic flux density of magnetic core 71 will magnetize and demagnetize back and forth in forward and reverse, can be beaten in this process
Disconnected magnetic polarization process of the external electromagnetic field to magnetic material.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.
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.The toroidal shell 70 is set on the ground wire 16 of arrester and it is wrapped
Include the left shell half body 705 and right half-shell body 706 that can mutually dismantle.
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 6.When the direct current signal of arrester leakage current is after first coil winding
The magnetic field produced in magnetic core is focused on double Hall elements, and electricity will be produced after double hall sensings to this part magnetic flux density
Pressure, amplification of the voltage signal through operational amplifier that double Hall elements produce complete the control of discharge to input power,
So that the positive interface of input power, to output Contrary compensation electric current in second coil winding, the magnetic flux that compensation electric current produces is with taking shelter from the thunder
Flow direction caused by device leakage current makes in magnetic core on the contrary, by control of the operational amplifier to Contrary compensation electric current
Magnetic flux density is always definite value, and electric current is compensated in second coil winding at this time is input to ground after measured resistance R1 again,
By ammeter to the current values that circulate in measurement resistance R1, and according to the current values carry out scale operation draw it is lightning-arrest
The direct current signal value of device leakage current, not only circuit structure is simple for above detection process, manufacturing cost is low, but also detection accuracy
Height, can ensure signal detection precision.
Further, since complicated electromagnetic field to magnetic core in addition to it can cause the influence of magnetic polarization, it is also possible to influence electronics electricity
The steady operation on road.So the present invention can also realize electromagnetic isolation in terms of wire laying mode, structure design and shell processing, decouple
The functions such as filtering, so as to enable a system to long-time steady operation.By setting shield shell and insulation shell, advantageously reduce
The magnetic flux leakage of magnetic core, accordingly improves measurement accuracy, at the same also can effective shield perimeter electromagnetic field interference, reduce measurement and miss
Difference.
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.The corresponding UHVDC Arrester leakage current of the present embodiment it is online
Method for detecting, 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 double Hall elements 720, due to two Hall element 720 position not
Together, thus unequal Hall voltage is produced, the two Hall circuit modules 72 are connected according to shunt capacitance via circuit in parallel
Equivalent circuit synthesis after, the output valve for the voltage signal that the two Hall circuit modules 72 produce is two Hall circuit modules 72
The arithmetic mean of instantaneous value of output valve, amplification of the voltage signal through operational amplifier 80 that double Hall elements 720 produce are completed
To the control of discharge of input power 83 so that the positive interface 830 of input power 83 is reversely mended to output in second coil winding 711
Electric current is repaid, the magnetic flux that compensation electric current produces is with flow direction caused by arrester leakage current on the contrary, passing through operational amplifier
The control of 80 pairs of Contrary compensation electric currents, it is always definite value to make the magnetic flux density in magnetic core 71, is mended at this time in second coil winding 711
Repay electric current and be input to ground after measured resistance R1 again, by ammeter A to the current values that circulate in measurement resistance R1,
And the direct current signal value of leakage current of an arrester is drawn according to current values progress scale operation, hence into next step
Suddenly.
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 AC signal on the magnetic core 71, on magnetic core 71
In loading after AC signal, the magnetic flux density of magnetic core 71 will magnetize and demagnetize back and forth in forward and reverse, in this process meeting
Interrupt magnetic polarization process of the external electromagnetic field to magnetic material.
In addition, tested in the present embodiment experiment using nano amorphous material by Chinese Academy of Sciences's magnetisable material and device emphasis
Room provides.Also pass through the applicant repeatedly to test, magnetic core made from other kinds of nano amorphous material can also complete this
The purpose of item application.
Embodiment two
With reference to Fig. 6.The present embodiment and the embodiment of embodiment one are substantially the same, its difference is：The data
It is in sequentially connected emission of radio frequency signals unit 50, frequency modulation retransmission unit 51 and dual mode communication unit 52 that dispensing device, which includes,
The data sink 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. the online detecting system of the UHVDC Arrester leakage current based on cloud, it is characterised in that：Set including one
Detection device, the leakage current testing result for the detection device to be obtained being placed near direct current arrester are transmitted
Data sending device, data sink, central monitoring device and mobile terminal, the Enable Pin of the data sink connect
The output terminal of the data sending device is connected to, the Enable Pin of the central monitoring device is connected to the data sink
Output terminal, the output terminal connection of the central monitoring device and the Enable Pin of the mobile terminal；The detection device includes number
Include current sense according to collecting unit, data processing unit, protection circuit unit and power supply unit, the data acquisition unit
Device, power amplifier and circuit acquisition module, the current sensor include a toroidal shell, the magnetic core of a C-shaped arrangement
And two Hall circuit modules, an accommodating space is provided with the toroidal shell, rotating around equipped with one first on the magnetic core
Coil windings and a second coil winding, and the magnetic core is installed in the accommodating space, the two Hall circuit modules
It is installed in the accommodating space and its both ends and the both ends of the magnetic core to abut, is connected between the two Hall circuit modules
There is an electric bridge, the input terminal of the first coil winding is electrically connected with lightning arrester leakance, the input of the second coil winding
End is electrically connected with an output terminal of the power amplifier, another output terminal and the circuit collection mould of the power amplifier
Block is electrically connected, magnetic flux density direction caused by the second coil winding and the magnetic flux density direction of the first coil winding
Conversely；The toroidal shell includes a shield shell and the insulation shell being arranged on the outside of the shield shell, the magnetic core bag
Two symmetrically arranged arc pellets and a fixing pipe are included, two arc pellets are respectively mutually abutted with one end, and in the abutting
The both sides of position are socketed by the fixing pipe, and the arc pellet is arc pellet made of nano amorphous material, institute
It is nano amorphous material fixing pipe to state fixing pipe；The toroidal shell be set on the ground wire of arrester and it include can be mutual
The left shell half body and right half-shell body of dismounting；The data sending device include in sequentially connected emission of radio frequency signals unit,
Frequency modulation retransmission unit and dual mode communication unit, the data sink are what is be connected with the output terminal of the dual mode communication unit
Public network signal receiving unit；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.
2. the online detecting system of the UHVDC Arrester leakage current based on cloud as claimed in claim 1, it is special
Sign is：The adjustment resistance that each Hall circuit module includes a Hall element and is in series with the Hall element,
The control current terminal of the Hall circuit module is in parallel to be accessed in DC constant flowing power an I+ and I-, and two Hall circuits
Also the data contacts in parallel for VH+ and VH-, the power amplifier include one and are exported with the data contacts output terminal of module
Operational amplifier, one first triode, one second triode and the input power being electrically connected are held, first triode
Collector is electrically connected to the positive interface of the input power, and the collector of second triode is connected to the input power
Negative interface, the output terminal of the power amplifier are divided into two-way, are connected to the base stage of first triode all the way, and another way connects
The base stage of second triode is connected to, the amplifying stage of first triode is divided into two-way, is connected to second line all the way
The input terminal of winding is enclosed, another way is connected to the amplifying stage of second triode, and the circuit acquisition module connects including one end
It is connected to the measurement resistance R1 of the second coil winding output terminal and the electric current for measuring current values in the measurement resistance
Table, the other end ground connection of the measurement resistance R1.
3. the online detecting system of the UHVDC Arrester leakage current based on cloud as claimed in claim 2, it is special
Sign is：The electric bridge includes two resistance pair being arranged in parallel, and the contact of the side of two resistance pair is connected to a Hall circuit
Hall element and the connecting part among adjustment resistance, the contact of the opposite side of two resistance pair are connected to another Hall electricity in module
Hall element and the connecting part among adjustment resistance in the module of road, the two each resistance of resistance centering being arranged in parallel are to respectively including two
A resistance being arranged in series, and the wherein centre for the resistor wiring that a resistance centering two is arranged in series and another resistance centering two
The intermediate electrical for the resistor wiring being arranged in series connects.
4. the online detecting system of the UHVDC Arrester leakage current based on cloud as claimed in claim 1, it is special
Sign is：The opening of the magnetic core formed with an air gap, the two Hall circuit module parallel arranged for interval in the air gap,
Volume occupied by the fixing pipe is a quarter of the accommodating space volume, the arc core positioned at the fixing pipe side
The volume not put in block occupied by the part of fixing pipe is 1/3rd of the accommodating space volume, positioned at the fixing pipe
It is 1/3rd of the accommodating space volume not put on the volume occupied by the part of fixing pipe in the arc pellet of opposite side,
The second coil winding includes upper second coil and is set around around portion and lower second coil around portion, upper second coil around portion
The part of fixing pipe is not put in the arc pellet of the fixing pipe side, lower second coil is set around around portion to be located at
The part of fixing pipe is not put in the arc pellet of the fixing pipe opposite side, upper second coil is around portion and lower second coil
It is electrically connected to each other around portion, the first coil winding is set around the outside of the fixing pipe.
5. the online detecting system of the UHVDC Arrester leakage current based on cloud as claimed in claim 1, it is special
Sign is：The central monitoring device includes background processor and holder, and the input terminal of the background processor is connected to
The data sink, the output terminal of the background processor are connected to the mobile terminal and above-mentioned holder,
The input terminal of the background processor is also associated with an encryption unit, and the output terminal of the holder is connected with a terminal and shows
Device.
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| RU204520U1 (en) * | 2021-04-22 | 2021-05-28 | Евгений Николаевич Коптяев | LEAKAGE CURRENT SENSOR |
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| CN110208598B (en) * | 2019-05-29 | 2021-11-05 | 上海空间电源研究所 | Hall current sensor circuit with double-Hall element structure |
| CN110618329B (en) * | 2019-09-27 | 2024-04-19 | 合肥天力源电子科技有限公司 | Test system and frequency hopping filter test device |
| CN111521953B (en) * | 2020-05-26 | 2022-07-29 | 广州市扬新技术研究有限责任公司 | Rail transit contact net leakage current detecting system |
| CN111880055B (en) * | 2020-07-09 | 2024-04-16 | 上海联影医疗科技股份有限公司 | Spark detection device and method |
| CN113049983A (en) * | 2021-03-12 | 2021-06-29 | 广西电网有限责任公司电力科学研究院 | Lightning arrester leakage current non-contact wireless monitoring system |
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| RU204520U1 (en) * | 2021-04-22 | 2021-05-28 | Евгений Николаевич Коптяев | LEAKAGE CURRENT SENSOR |
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