CN105301325B - With hall sensing theory to the method for UHVDC Arrester leakage current collection - Google Patents
With hall sensing theory to the method for UHVDC Arrester leakage current collection Download PDFInfo
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Abstract
With hall sensing theory to the method for UHVDC Arrester leakage current collection, following steps are respectively completed using a detection device：A, judge whether to carry out signal acquisition to electric current；B, signal acquisition is carried out to electric current；C, the output of electric current Value Data is formed after being handled the signal of acquisition.The voltage signal that the present invention is generated by double Hall circuit elements is acted on through power amplifier conducting so that generating Contrary compensation electric current in second coil winding, it is opposite with flow direction caused by arrester leakage current to compensate the magnetic flux that electric current generates, after the two realizes magnetic balance, after compensating test of the electric current using circuit acquisition module in second coil winding, obtain the direct current signal value of leakage current of an arrester, 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 promoted, and 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 be related to hall sensing theory
To the method for UHVDC Arrester leakage current collection.
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 needs to improve imbalance between power supply and demand problem by remote, large capacity transmission circuit, " west
Send in electric east ", the engineerings 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 to by electricity by DC power transmission line
It holds and alternating current is become by transverter, finally inject AC network.The voltage class concept of extra-high voltage direct-current transmission with exchange
It transmits electricity different.For ac transmission, 220kV and voltage class below are generally known as high pressure, 330~750kV's
Referred to as super-pressure, 1000kV's or more is known as extra-high voltage.Direct current transportation is then slightly different, and ± 100kV's or more is referred to as height
Pressure；± 500kV and ± 600kV are still referred to as high pressure, are not known as super-pressure generally；And be more than ± 600kV then be known as extra-high voltage.
± 800kV extra-high voltage direct-current transmissions can have a large amount of big load centers of electric power direct sending since centre is without drop point
Transmission capacity is big, power transmission distance is remote, saves the advantages that transmission of electricity stringing corridor, the technologies such as relevant device research and development, control and operation and
Demonstration project is rapidly developed and extensive use in recent years, and China has been made to be in the world in UHV transmission technical field
Leading position 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, and 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
Area and cost.It is most important for the Insulation Coordination of optimization system and reduction project cost to improve protection of arrester level.The palm
Direct current arrester real-time running state and protection feature are held to reinforcing the operational management, perfect of direct-current ultra high voltage transmission system equipment
Its live detection technology and repair based on condition of component level have a very important significance.
For now, the service condition of direct current arrester is much harsher than alternating-current lightning arrestor, to direct current arrester
The technology that runnability proposes requires 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 carries out ultra-high voltage lightning arrester while improving ultra-high voltage lightning arrester product reliability, strengthening quality control
It monitors on-line significant and is in urgent need.A kind of UHVDC Arrester leakage current that is directed to especially is needed in a hurry
Detection 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
It changes circuit and is 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 the above leakage current alarm system principle is simple, alarm effect is apparent, however in the actual use process also
It has the following disadvantages：1, the 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, especially in the self-insurance of Lightning Over-voltage
Shield requirement may also be difficult to reach, thus the technology of leakage current alarm system requires to cannot be satisfied in extra-high voltage direct-current transmission line
It is effectively and stably run in road；2, the 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.
Invention content
The present invention is provided with hall sensing theory to the method for UHVDC Arrester leakage current collection, main mesh
Be overcome existing leakage current alarm system that can not carry out stablizing to UHVDC Arrester leakage current and accurate inspection
The defect of survey.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
With hall sensing theory to the method for UHVDC Arrester leakage current collection, distinguished using a detection device
Complete following steps：A, judge whether to carry out signal acquisition to electric current；B, signal acquisition is carried out to electric current；C, by the signal of acquisition
The output of electric current Value Data is formed after being handled, the detection device includes data acquisition unit, data processing unit, protection electricity
Road unit and power supply unit, the data acquisition unit include current sensor, power amplifier and circuit acquisition module,
The current sensor includes a toroidal shell, the magnetic core of a C-shaped arrangement and two Hall circuit modules, the toroidal shell
Inside it is provided with an accommodating space, rotating around equipped with a first coil winding and a second coil winding on the magnetic core, and
The magnetic core is installed in the accommodating space, the two Hall circuit modules be installed in the accommodating space and its both ends with
The both ends of the magnetic core abut, and an electric bridge, the input of the first coil winding are connected between the two Hall circuit modules
End is electrically connected with lightning arrester leakance, and the input terminal of the second coil winding and an output end of the power amplifier are electrically connected
It connects, another output end of the power amplifier is electrically connected with the circuit acquisition module, and the detection device further includes adopting
Collect protection module, the electric energy output end of the power supply unit is divided into four tunnels, and the electric energy being electrically connected in protection circuit unit is defeated
Electrical energy inputs, the electrical energy inputs of data acquisition unit and the electric energy of data processing unit for entering end, acquiring protection module
The output end of input terminal, arrester electric current is divided into two-way, is connected to the Enable Pin of the data acquisition unit all the way, and another way connects
It is connected to the Enable Pin of the acquisition protection module, the output end of the acquisition protection module is connected to the protection circuit unit
The Enable Pin of Enable Pin, the data processing unit is equipped with two-way, connects the output end of the data acquisition unit all the way, another
Road connects the output end of the protection circuit unit；After the step a is included in the extraction wire for connecting arrester electric current, pass through
It acquires protection module and data acquisition unit and Preliminary detection is carried out to the electric current on lead, when arrester electric current is less than or equal to 1
Milliampere hour, acquisition protection module are failure to actuate, and data acquisition unit starts and after carrying out signal acquisition and data processing to electric current
It is exported via data processing unit；When arrester electric current is more than 1 milliampere hour, data acquisition unit is motionless, and acquires protection module
Start, high-impedance state is presented to input in the detection device, at this time without signal acquisition and data processing, and via data processing
Unit exports.
Further, the step b include when arrester leakage current direct current signal after first coil winding
The magnetic field generated in magnetic core is focused into the two Hall circuit modules, due to the two Hall circuit module position not
Together, thus unequal Hall voltage is generated, the two Hall circuit modules are connected via circuit in parallel according to shunt capacitance
After equivalent circuit synthesis, the output valve for the voltage signal that the two Hall circuit modules generate is two Hall circuit module output valves
Arithmetic mean of instantaneous value, the output valve of the voltage signal acts on through power amplifier conducting so that being generated in second coil winding reversed
Compensation electric current, the magnetic flux that compensation electric current generates is with flow direction caused by arrester leakage current on the contrary, when the two realizes magnetic
After balance, core flux zero, in second coil winding compensation electric current using after the test of circuit acquisition module to get going out to keep away
The direct current signal value of thunder device leakage current is hence into step c.
Further, each Hall circuit module include a Hall element and be in series with the Hall element one
Resistance is adjusted, the control current terminal parallel connection of the Hall circuit module is accessed in DC constant flowing power an I+ and I-, and two institutes
The output end data contacts that also parallel connection is VH+ and VH- of Hall circuit module are stated, the power amplifier includes one and the number
According to operational amplifier, one first triode, one second triode and an input power that contact output end is electrically connected, 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 output end of the negative interface of input power, the power amplifier is divided into two-way, is 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
It is connected to the measurement resistance R1 of the second coil winding output end including one end and for measuring electric current in the measurement resistance
The ammeter of numerical value, the other end ground connection for measuring resistance R1；The step b includes, when the direct current of arrester leakage current
The magnetic field that signal generates after first coil winding in magnetic core is focused on two Hall elements, due to two Hall
The position of circuit module is different, thus generates 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 generate is two suddenly
The arithmetic mean of instantaneous value of your circuit module output valve, amplification of the output valve through operational amplifier of the voltage signal are completed pair
The control of discharge of input power so that the positive interface of input power exports Contrary compensation electric current in second coil winding, compensation
The magnetic flux that electric current generates is with flow direction caused by arrester leakage current on the contrary, by operational amplifier to Contrary compensation electricity
The control of stream, it is always definite value to make the magnetic flux density in magnetic core, and it is electric using measuring to compensate electric current in second coil winding at this time
Be input to ground after resistance R1, by ammeter to measuring the current values that circulate in resistance R1, and according to the current values into
Row scale operation is the direct current signal value for obtaining leakage current of an arrester, hence into step c.
Further, inert-gas diode and TVS diode are added in the extraction wire of arrester electric current, it should
TVS diode differential concatenation is grounded, and in step a, when arrester electric current is higher than preset threshold value, TVS diode can
To be actuated for release current rapidly, inert-gas diode is started later, sustained release electric current.
Further, further include step f, step f is through entire on-line checking process comprising to adding on the magnetic core
It is loaded with AC signal, after upper AC signal is loaded on magnetic core, the magnetic flux density of magnetic core will back and forth magnetize in forward and reverse
And demagnetization, it can interrupt magnetic polarization process of the external electromagnetic field to magnetic material in this process.
Further, the toroidal shell includes a shield shell and the insulation shell that is set 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 in the both sides of the abutted position by the way that on fixing pipe set, the arc pellet is arc made of nano amorphous material
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, is located at the fixing pipe
The one third that the volume occupied by the part of fixing pipe is the accommodating space volume, position are not put in the arc pellet of side
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 other side
Long-pending one third, 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 other 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.
Compared to the prior art, the advantageous effect that the present invention generates is:
1, 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 generated in magnetic core afterwards is focused into the two Hall circuit modules, due to the position of the two Hall circuit module
Difference is set, thus generates unequal Hall voltage, the two Hall circuit modules are connected via circuit in parallel according to electricity in parallel
After the equivalent circuit synthesis of appearance, the output valve for the voltage signal that the two Hall circuit modules generate is that two Hall circuit modules are defeated
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 generated in second coil winding
Contrary compensation electric current, the magnetic flux that compensation electric current generates is with flow direction caused by arrester leakage current on the contrary, when the two is real
After existing magnetic balance, core flux zero, in second coil winding compensation electric current using after the test of circuit acquisition module to get
Go out the direct current signal value of leakage current of an arrester, thus one aspect of the present invention is carried out to lightning arrester leakance using contactless
Acquisition, thereby may be ensured that collecting unit can effectively and stably be run in complex electromagnetic fields, not only voltage endurance capability
It is greatly promoted, and can have stronger self- recoverage and adaptive ability under overvoltage.Another aspect of the present invention is
Have two Hall circuit modules of setting, in this case the Hall element in this two Hall circuit module can be connected into two kinds it is defeated
Go out form, the output one is sensor is the arithmetic mean of instantaneous value form of two single Hall output, this kind of method is suitable for closed loop
Hall current sensor pattern can considerably reduce the nonlinearity and site error of sensor, improve sensor
Anti-interference ability and range ability.Another kind is the sensor that two Halls coordinate certain component to form, and output is poor
Form-separating.This kind of double Hall current sensor schemes can inhibit 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.
2, in the present invention, it is modularization of the core sensing element for isolation detection electric current by using double Hall elements
Product, since Hall element itself can generate Hall effect, 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, generate magnetic field around conducting wire, the size in magnetic field and flow through the size of current of conducting wire at
Direct ratio, this magnetic field can be assembled by Hall element, be then detected with double Hall elements, due to magnetic field variation 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 that its accuracy higher, response are faster, warm
Float small, especially 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..
3, in the present invention, after by loading upper AC signal on magnetic core, the magnetic flux density of magnetic core will positive and
It reversely magnetizes and demagnetizes 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.
4, in the present invention, all lead-in conductors, extraction wire and other it is necessary to part may be selected install additional it is 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 the two makes simultaneously
With can be good at solving the problems, such as circuit protection.
5, in the present invention, complicated electromagnetic field is other than it can cause magnetic core 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 the way that shield shell and insulation shell is arranged
Etc. functions, to enable a system to long-time steady operation.And by the way that above-mentioned shield shell and insulation shell is arranged, be conducive to
The magnetic flux leakage for reducing magnetic core, accordingly improves measurement accuracy, at the same also can effective shield perimeter electromagnetic field interference, reduce and measure
Error.
6, in the present invention, current sensor by nano amorphous material, double Hall elements, nano amorphous material fixing pipe and
Shell is shielded to constitute.In order to facilitate the installation of, nano amorphous material is made HALF structures by us.It is installed in nano amorphous material
It is fixed using fixing pipe after finishing, to ensure that the material can be docked preferably sensor at work.The present invention is in selection magnetic
When 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, in the high current for bearing moment
After impact, it can be very good to restore.
7, in the present invention, it is generated in magnetic core after first coil winding when the direct current signal of arrester leakage current
Magnetic field be focused on double Hall elements, voltage will be generated after double hall sensings to this part magnetic flux density, double Halls are first
Amplification of the voltage signal through operational amplifier that part generates completes the control of discharge to input power so that input power
Positive interface export Contrary compensation electric current in second coil winding, the magnetic flux and arrester leakage current institute that compensation electric current generates
The flow direction of generation makes magnetic flux density in magnetic core always on the contrary, control by operational amplifier to Contrary compensation electric current
For definite value, electric current is compensated in second coil winding at this time using ground is input to after measuring resistance R1, passes through ammeter pair
The current values to circulate in resistance R1 are measured, and carries out scale operation according to the current values and obtains leakage current of an arrester
Direct current signal value, not only circuit structure is simple for the above detection process, manufacturing cost is low, but also detection accuracy is high, can ensure
Signal detection precision.
Description of the drawings
Fig. 1 is the schematic block circuit diagram of embodiment one in the present invention.
Fig. 2 is the structural schematic 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.
Specific implementation mode
Illustrate the specific implementation mode of the present invention with reference to the accompanying drawings.
Embodiment one
Referring to Fig.1.A kind of online detecting system of UHVDC Arrester leakage current, including one be set to direct current and keep away
The data that detection device 1 near thunder device, the leakage current testing result for obtaining the detection device 1 are transmitted are sent
Device, data sink, central monitoring device and mobile terminal 3.The data sending device is that public network signal transmitting is single
Member 5, data sink are 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 transmission, 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 reservoir 41, the input terminal connection of the background processor 40
It is connected to the mobile terminal 3 and above-mentioned storage in the output end of the data sink, the background processor 40
The input terminal of storage 41, the background processor 40 is also associated with an encryption unit 42, the output end connection of the reservoir 41
There is a terminal display 43.The Enable Pin of the data sink is connected to the output end of the data sending device, described
The Enable Pin of central monitoring device is connected to the output end of the data sink, and the output end 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, to both avoid maintenance personnel severe
Weather is frequently patrolled surge arrester failure point, and the risk that maintenance personal gets an electric shock is reduced, and reduces the time restored 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 generallys include the Cloud Server by net connection（The as described central monitoring device）, cloud client（As institute
State mobile terminal 3）With at least one measuring terminals（As it is set to the detection dress in each power grid on each UHVDC Arrester
Set 1 or the detecting instrument and equipment of other direct current arrester status informations, the function of these detecting instruments and equipment includes
Grounding resistance, leakage current and harmonic wave, the electrostatic of the equipment such as measurement lightning protection or telecommunications, electrical and electronics board may be implemented
Deng variation）.In the system normal operation, measuring terminals are by net connection by data transfer to Cloud Server, cloud
Client obtains required measurement data from Cloud Server, and user inquires measurement data by cloud client, shows, is defeated
Go out, utilization, the operations such as assessment, realize the impossible association to the associated objects positioned at Different field of conventional measurement techniques
It adjusts or correlation measurement is realized so as to shorten time of measuring and is carried out at the same time real time monitoring to multiple measuring terminals and to tested pair
The long-range measurement of elephant, while being conducive to analyse and study thunder-strike phenomenon scientifically.
Referring to Fig.1.The detection device 1 includes data acquisition unit 10, data processing unit 11, protection circuit unit
12, power supply unit 13 and one acquires 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
The electrical energy inputs and data processing unit 11 for entering end, acquiring the electrical energy inputs of protection module 14, data acquisition unit 10
Electrical energy inputs.At work, the output end 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 acquisition protection module 14 Enable Pin, it is described acquisition protection module 14 output end connect
It is connected to the Enable Pin of the protection circuit unit 12, the Enable Pin of the data processing unit 11 is equipped with two-way, connects institute all the way
The output end of data acquisition unit 10 is stated, another way connects the output end of the protection circuit unit 12, when arrester electric current is small
In or equal to 1 milliampere hour, acquisition protection module 14 is failure to actuate, and data acquisition unit 10 starts and carries out signal acquisition to electric current
It is exported by data processing unit 11 with being passed through after data processing；When arrester electric current is more than 1 milliampere hour, data acquisition unit 10 is not
It is dynamic, and the startup of protection module 14 is acquired, high-impedance state is presented to input in the detection device 1, at this time without signal acquisition sum number
It is exported according to processing, and via data processing unit 11.
Referring to Fig.1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.The data acquisition unit 10 includes current sensor 7, power amplifier
8, circuit acquisition module 9.
Referring 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
Magnetic core 71 and two Hall circuit modules 72, an accommodating space 700 is provided in 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 adjoining, is connected with an electric bridge 73 between two Hall circuits, 72 module, the input terminal of the first coil winding 710 with keep away
Thunder device leakage current is electrically connected, and the input terminal of the second coil winding 711 and an output end of the power amplifier 8 are electrically connected
It connects, another output end of the power amplifier 8 is electrically connected with the circuit acquisition module 9,711 institute of the second coil winding
The magnetic flux density direction of generation is opposite with the magnetic flux density direction of the first coil winding 710.
Referring to Fig.1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.Each Hall circuit module 72 include a Hall element 720 and
With the Hall element 720 be in series one adjustment resistance 722, the Hall circuit module 72 control current terminal parallel connection access in
The I+ and I- of one DC constant flowing power 723, and it is VH+'s and VH- that the output end of the two Hall circuit modules 72 is also in parallel
Data contacts 721, the power amplifier 8 include one be electrically connected with 721 output end of the data contacts operational amplifier 80,
One first triode 81, one second triode 82 and an input power 83, the collector electrical connection of first triode 81
It is connected to the negative of the input power 83 in the collector of the positive interface 830 of the input power 83, second triode 82
The output end of interface 831, the power amplifier 8 is divided into two-way, is connected to the base stage of first triode 81 all the way, another
Road is connected to the base stage of second triode, and the amplifying stage of first triode 81 is divided into two-way, is connected to all the way described
The input terminal of second coil winding 711, another way are connected to the amplifying stage of second triode 82, the circuit acquisition module
9 including one end are connected to the measurement resistance R1 of 711 output end of the second coil winding and for measuring in the measurement resistance
The ammeter A of current values, the other end ground connection for measuring resistance R1.When the direct current signal of arrester leakage current is by the
The magnetic field generated in magnetic core after one coil windings is focused into the two Hall circuit modules, due to the two Hall electricity
The position of road module is different, thus generates unequal Hall voltage, and the two Hall circuit modules are connected via circuit in parallel
After the equivalent circuit synthesis of shunt capacitance, the output valve for the voltage signal that the two Hall circuit modules generate is two Halls
The output valve of the arithmetic mean of instantaneous value of circuit module output valve, the voltage signal is acted on through power amplifier conducting so that the second coil
Contrary compensation electric current is generated on winding, the magnetic flux and flow direction phase caused by arrester leakage current that compensation electric current generates
Instead, after the two realizes magnetic balance, core flux zero, compensation electric current is using circuit acquisition module in second coil winding
To get going out the direct current signal value of leakage current of an arrester after test, thus one aspect of the present invention is using contactless to lightning-arrest
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 promoted, but also can have stronger self- recoverage and adaptive ability under overvoltage.This hair
Bright another aspect is that have two Hall circuit modules of setting, and in this case the Hall element in this two Hall circuit module is equal
Two kinds of output forms can be connected into, the output one is sensor is the arithmetic mean of instantaneous value form of two single Hall output, this kind of side
Method is suitable for closed-loop Hall current sensor pattern, can considerably reduce the nonlinearity and site error of sensor, carry
The high anti-interference ability and range ability of sensor.Another kind is the sensing that two Halls coordinate certain component to form
Device, output is difference form.This kind of double Hall current sensor schemes can inhibit temperature drift and are total to from signal source
Mould interferes, 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 in direct current arrester at any time by central monitoring device
The variation of leakage current, harmonic wave and electrostatic etc., can effectively prevent the equipment such as lightning protection telecommunications or electrical and electronics board because
Grounding resistance is excessively high, influences the earthing effect of lightning stroke, effectively prevents the damage and the injures and deaths that cause building and people and animals, and
It is conducive to extend the service life of arrester.It is that core sensing element is used for isolation detection that the present embodiment, which also utilizes double Hall elements,
The modular product of electric current, since Hall element itself can generate Hall effect, thus its operation principle is to use magnetic recording level
Weighing apparatus formula principle generates magnetic field that is, when electric current flows through the straight wire of a root long around conducting wire, the size in magnetic field and flows through 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 variation 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 especially under complicated electric field environment, double Hall elements have stronger diamagneticization and resist polarized spy
Property, thus the accurate and stably measured that alternating current and direct current, pulse signal may be implemented etc..
Referring to Fig.1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.The electric bridge 73 includes two resistance pair 730 being arranged in parallel and resistance pair
731, the contact of the side of the resistance pair 730 and resistance pair 731 is connected in a Hall circuit module 72 Hall element 720 and adjusts
The contact of the other side of connecting part among whole resistance 722, the resistance pair 730 and resistance pair 731 is connected to another Hall circuit
Hall element 720 and the connecting part among adjustment resistance 722 in module 72, resistance pair 730 and resistance pair 731 include respectively two strings
Join the resistance 733 of setting, and in resistance pair 730 in the centre of two 733 wiring of resistance being arranged in series and another resistance pair 731
The intermediate electrical of two 733 wiring of resistance being arranged in series connects.
Referring to Fig.1, Fig. 2, Fig. 3, Fig. 4 and Fig. 6.The toroidal shell 70 includes a shield shell 701 and is set to this
The insulation shell 702 in 701 outside of shield shell, the magnetic core 71 include that two symmetrically arranged arc pellets 714 and one are solid
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
It puts 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
It constitutes.In order to facilitate the installation of, nano amorphous material is made HALF structures by us.Make after nano amorphous material installs
It is 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 amorphous soft magnet as current sensor
Core material.Amorphous soft magnet and nano amorphous material have good recovery capability, after bearing the heavy current impact of moment,
It can be very good to restore.
Referring 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 the accommodating space
Long-pending a quarter is not put in the arc pellet 714 of 715 side of the fixing pipe occupied by the part of fixing pipe 715
Volume be 700 volume of the accommodating space one third, be located at 715 other side of the fixing pipe arc pellet 714 in
The one third that the volume occupied by the part of fixing pipe 715 is 700 volume of the accommodating space, second coil are not put on
Winding 711 includes upper second coil around portion and descends the second coil around portion, and upper second coil is set around 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 other side of the fixing pipe, upper second coil is around portion
It is electrically connected to each other around portion with lower second coil, the first coil winding 710 is set around the outside of the fixing pipe 715.
Referring 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
It is necessary to part may be selected to install inert-gas diode and TVS diodes additional and prevent 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, puts
Electric continuous capability is strong.So the two use simultaneously can be good at solving the problems, such as circuit protection.
Referring to Fig.1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.It is loaded with AC signal on 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
Magnetic polarization process of the disconnected external electromagnetic field to magnetic material.So 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.
Referring 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 that can mutually dismantle and right half-shell body 706.
Referring 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 generated in magnetic core is focused on double Hall elements, and electricity will be generated after double hall sensings to this part magnetic flux density
Pressure, amplification of the voltage signal through operational amplifier that double Hall elements generate complete the control of discharge to input power,
So that the positive interface of input power exports Contrary compensation electric current in second coil winding, the magnetic flux and take shelter from the thunder that compensation electric current generates
Flow direction caused by device leakage current makes on the contrary, control by operational amplifier to Contrary compensation electric current in magnetic core
Magnetic flux density is always definite value, at this time in second coil winding compensate electric current using measure resistance R1 after be input to ground,
By ammeter to measuring the current values that circulate in resistance R1, and according to the current values carry out scale operation obtain it is lightning-arrest
The direct current signal value of device leakage current, not only circuit structure is simple for the above detection process, manufacturing cost is low, but also detection accuracy
Height can ensure signal detection precision.
In addition, since complicated electromagnetic field is other than it can cause magnetic core 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, decoupling in terms of wire laying mode, structure design and shell processing
The functions such as filtering, to enable a system to long-time steady operation.By the way that shield shell and insulation shell is arranged, 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 to measure and miss
Difference.
Referring 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 includes the following steps：
A, judge whether to carry out signal acquisition to electric current, when arrester electric current is higher than preset threshold value, bis- poles TVS
Pipe can be actuated for rapidly release current, and inert-gas diode is started later, 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 generated 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 generated, the two Hall circuit modules 72 are connected via circuit in parallel according to shunt capacitance
Equivalent circuit synthesis after, the output valve for the voltage signal that the two Hall circuit modules 72 generate 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 generate are completed
To the control of discharge of input power 83 so that the positive interface 830 of input power 83 exports reversed benefit in second coil winding 711
Electric current is repaid, the magnetic flux that compensation electric current generates 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 in second coil winding 711 at this time
Electric current is repaid using ground is input to after measuring resistance R1, by ammeter A to measuring the current values that circulate in resistance R1,
And it is the direct current signal value for obtaining leakage current of an arrester to carry out scale operation according to the current values, hence into next step
Suddenly.
C, the output of electric current Value Data is formed after being handled the signal of acquisition.
D, the current data of acquisition is summarized 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 simultaneously
After the mobile terminal 3 of person, specially background processor 40 receive the short message of coding form, converts, 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 reservoir 41 forever
Kubo deposits above- mentioned information.
In addition, running through entire on-line checking process, have to being loaded with AC signal on the magnetic core 71, 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, in this process meeting
Interrupt magnetic polarization process of the external electromagnetic field to magnetic material.
In addition, being tested by Chinese Academy of Sciences's magnetisable material and device emphasis using nano amorphous material in the present embodiment experiment
Room provides.It also passes 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, the difference is that：The data
Sending device include be in sequentially connected emission of radio frequency signals unit 50, frequency modulation retransmission unit 51 and dual mode communication unit 52,
The data sink is the public network signal receiving unit 6 being connect with the output end of the dual mode communication unit 52.
The present embodiment can be made both circuit can to have been detected numerical value in the range of having public network covering using above-mentioned setting
It is transferred to central monitoring device, the emission of radio frequency signals unit and frequency modulation can also be passed through in the region of not public network signal
Lightning strike information is first dealt into the dual mode communication unit being arranged in public network coverage area, passed again later by the cooperation of retransmission unit
It is defeated to arrive central monitoring device, the applicable situation of the present invention can be widened significantly in this way 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 emits collected current data, can overcome the single frequency point propagation distance too short
Defect so that applicable situation of the invention is broader.
In addition, since the present embodiment is for data sending device and one different from of embodiment, thus the present embodiment is to spy
The online method for detecting of high voltage direct current arrester leakage circuit is also different, the difference is that：
On the one hand, step d includes that after data processing unit is handled by data operation, will contain leakage current of an arrester
Direct current signal value, time of measuring or arrester installation site information coding pass 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, it after step e includes the short message that background processor receives coding form, is converted into row information, it will
Coding information is converted into Chinese information and is sent on the mobile terminal of related management personnel or maintenance personal, and in reservoir forever
Kubo deposits above- mentioned information.
The specific implementation mode 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 for carrying out unsubstantiality to the present invention, the behavior for invading the scope of the present invention should all be belonged to.
Claims (6)
1. with hall sensing theory to the method for UHVDC Arrester leakage current collection, which is characterized in that utilize an inspection
It surveys device and is respectively completed following steps：A, judge whether to carry out signal acquisition to electric current；B, signal acquisition is carried out to electric current；C, will
The signal of acquisition forms current data output after being handled, the detection device includes data acquisition unit, data processing list
Member, 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, the magnetic core of a C-shaped arrangement and two Hall circuit modules, institute
It states and is provided with an accommodating space in toroidal shell, rotating around equipped with a first coil winding and one second coil on the magnetic core
Winding, and the magnetic core is installed in the accommodating space, and the two Hall circuit modules are installed in the accommodating space simultaneously
And its both ends and the both ends of the magnetic core abut, and an electric bridge is connected between the two Hall circuit modules；Each Hall electricity
Road module includes a Hall element and the adjustment resistance being in series with the Hall element, the control of the Hall circuit module
Current terminal parallel connection access processed is in DC constant flowing power an I+ and I-, and also parallel connection is the output end of the two Hall circuit modules
The data contacts of VH+ and VH-, the power amplifier include an operation amplifier being electrically connected with the data contacts output end
Device, one first triode, one second triode and an input power, the collector of first triode are electrically connected to described
The collector of the positive interface of input power, second triode is connected to the negative interface of the input power, and the operation is put
The output end of big device is divided into two-way, is connected to the base stage of first triode all the way, another way is connected to the two or three pole
The amplifying stage of the base stage of pipe, first triode is divided into two-way, is connected to the input terminal of the second coil winding all the way, separately
Be connected to the amplifying stage of second triode all the way, the circuit acquisition module include one end be connected to second coil around
The measurement resistance R1 of group output end and the ammeter for measuring current values in the measurement resistance, it is described to measure resistance R1's
The other end is grounded；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
Hall element and the connecting part among adjustment resistance in circuit module, the contact of the other side of two resistance pair be connected to it is another suddenly
Hall element and the connecting part among adjustment resistance in your circuit module, the two each resistance of resistance centering being arranged in parallel are to each packet
Include two resistance being arranged in series, and the centre for the resistor wiring that wherein a resistance centering two is arranged in series and another resistance pair
In the intermediate electricals of two resistor wirings being arranged in series connect；The input terminal of the first coil winding is electrically connected with lightning arrester leakance
It connects, the input terminal of the second coil winding is electrically connected with an output end of the power amplifier, the power amplifier
Another output end is electrically connected with the circuit acquisition module, and the detection device further includes an acquisition protection module, the power supply
The electric energy output end of unit is divided into four tunnels, is electrically connected the electrical energy inputs in protection circuit unit, acquires protection module
The electrical energy inputs of electrical energy inputs, the electrical energy inputs of data acquisition unit and data processing unit, arrester electric current
Output end is divided into two-way, is connected to the Enable Pin of the data acquisition unit all the way, and another way is connected to the acquisition protection mould
The Enable Pin of block, the output end of the acquisition protection module is connected to the Enable Pin of the protection circuit unit, at the data
The Enable Pin for managing unit is equipped with two-way, connects the output end of the data acquisition unit all the way, and another way connects the protection electricity
The output end of road unit；After the step a is included in the extraction wire for connecting arrester electric current, by acquiring protection module sum number
Preliminary detection is carried out to the electric current on lead according to collecting unit, when arrester electric current is less than or equal to 1 milliampere hour, acquisition protection mould
Block is failure to actuate, and data acquisition unit starts and defeated by data processing unit to being passed through after electric current progress signal acquisition and data processing
Go out；When arrester electric current is more than 1 milliampere hour, data acquisition unit is motionless, and acquires protection module startup, the detection device pair
Input is presented high-impedance state and is not also exported by data processing unit at this time without signal acquisition and data processing；The circular casing
Body includes a shield shell and the insulation shell that is set on the outside of the shield shell, and the magnetic core includes two symmetrically arranged
Arc pellet and a fixing pipe, two arc pellets are respectively mutually abutted with one end, and pass through institute in the both sides of the abutted position
It states fixing pipe to put on, the arc pellet is arc pellet made of nano amorphous material, and the fixing pipe is nano amorphous material
Expect fixing pipe；The toroidal shell is set in the left shell half body and the right side that on the ground wire of arrester and it, which includes, mutually to dismantle
Half shell.
2. special as described in claim 1 with hall sensing theory to the method for UHVDC Arrester leakage current collection
Sign is：The step b includes when the direct current signal of arrester leakage current generates after first coil winding in magnetic core
Magnetic field be focused into the two Hall circuit modules, since the position of the two Hall circuit module is different, thus produce
Raw unequal Hall voltage, the two Hall circuit modules are connected via circuit in parallel and are closed according to the equivalent circuit of shunt capacitance
The output valve of Cheng Hou, the voltage signal that the two Hall circuit modules generate are the arithmetic average of two Hall circuit module output valves
Value, the output valve of the voltage signal is acted on through power amplifier conducting to generate Contrary compensation electric current in second coil winding,
Compensate flow direction caused by magnetic flux and the arrester leakage current that electric current generates on the contrary, when both realization magnetic balance after, magnetic
Core magnetic flux is zero, in second coil winding compensate electric current using after the test of circuit acquisition module to get go out arrester leakage
The direct current signal value of electric current is hence into step c.
3. special as claimed in claim 2 with hall sensing theory to the method for UHVDC Arrester leakage current collection
Sign is：The step b includes, when the direct current signal of arrester leakage current generates after first coil winding in magnetic core
Magnetic field be focused on two Hall elements, since the position of the two Hall circuit module is different, thus generate unequal
Hall voltage, the two Hall circuit modules via circuit in parallel connect according to shunt capacitance equivalent circuit synthesis after, two
The output valve for the voltage signal that the Hall circuit module generates is the arithmetic mean of instantaneous value of two Hall circuit module output valves, the electricity
Amplification of the output valve through operational amplifier of signal is pressed to complete the control of discharge to input power so that input power
Positive interface exports Contrary compensation electric current in second coil winding, and the magnetic flux that compensation electric current generates is produced with arrester leakage current
Raw flow direction makes the magnetic flux density in magnetic core be always on the contrary, control by operational amplifier to Contrary compensation electric current
Definite value compensates electric current using ground is input to after measuring resistance R1, by ammeter to surveying at this time in second coil winding
The current values to circulate in resistance R1 are measured, and carries out scale operation according to the current values and obtains the straight of leakage current of an arrester
Signal value is flowed, hence into step c.
4. special as claimed in claim 3 with hall sensing theory to the method for UHVDC Arrester leakage current collection
Sign is：Inert-gas diode and TVS diode are added in the extraction wire of arrester electric current, the TVS diode is anti-
To series connection be grounded, in step a, when arrester electric current be higher than preset threshold value when, TVS diode can start rapidly into
Row release current, later inert-gas diode started, sustained release electric current.
5. special as claimed in claim 4 with hall sensing theory to the method for UHVDC Arrester leakage current collection
Sign is：Further include step f, step f runs through entire on-line checking process comprising to being loaded with exchange letter on the magnetic core
Number, after upper AC signal is loaded on magnetic core, the magnetic flux density of magnetic core 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.
6. special as described in claim 1 with hall sensing theory to the method for UHVDC Arrester leakage current collection
Sign is：The opening of the magnetic core is 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, is located at the arc core of the fixing pipe side
The one third that the volume occupied by the part of fixing pipe is the accommodating space volume is not put in block, is located at the fixing pipe
The one third that the volume occupied by the part of fixing pipe is the accommodating space volume is not put in the arc pellet of the other side,
The second coil winding includes upper second coil around portion and descends the second coil around portion, and upper second coil is set around 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 other 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.
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| CN113126001A (en) * | 2021-04-20 | 2021-07-16 | 广东电网有限责任公司 | Electromagnetic monitoring system and method |
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| CN201007846Y (en) * | 2006-11-07 | 2008-01-16 | 西安神电电器有限公司 | On-line monitoring system for lightning arrester |
| CN102004179A (en) * | 2009-09-01 | 2011-04-06 | 天津市松正电动科技有限公司 | Magnetic induction current sensor for electric vehicle controller |
| CN101702361B (en) * | 2009-11-17 | 2011-08-10 | 武汉市长江电气发展有限公司 | Ultra-low frequency alternating-current (AC) constant-current demagnetization device of large transformer or mutual inductor and demagnetization detection method |
| CN201732112U (en) * | 2010-06-23 | 2011-02-02 | 长沙南车电气设备有限公司 | Voltage sensor for locomotives |
| CN102012448B (en) * | 2010-10-26 | 2012-07-04 | 西安交通大学 | Rogowski current sensor |
| CN102323467A (en) * | 2011-08-31 | 2012-01-18 | 清华大学 | Giant magnetoresistive effect current sensor using amorphous alloy magnetic ring structure |
| CN202256454U (en) * | 2011-10-12 | 2012-05-30 | 长沙南车电气设备有限公司 | Current sensor |
| CN102998511B (en) * | 2012-10-29 | 2016-04-20 | 中国电力科学研究院 | A kind of lightning arrester discharge current monitoring device |
| CN103364612A (en) * | 2013-07-05 | 2013-10-23 | 华中科技大学 | Dual-Hall element 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 |
| CN203759086U (en) * | 2013-12-24 | 2014-08-06 | 北京嘉岳同乐极电子有限公司 | Iron core grounding current online monitoring device |
| CN203658443U (en) * | 2013-12-25 | 2014-06-18 | 深圳市合兴加能科技有限公司 | Hall sensing device and three-phase current balance detection circuit |
| CN204439709U (en) * | 2014-03-13 | 2015-07-01 | 达州市远东电器有限公司 | A kind of information collecting device of electricity load management terminal |
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