CN105182162B - It is core to the acquisition unit of contactless faint leakage current signal using diskette - Google Patents

Abstract

A kind of using diskette is core to the acquisition unit of contactless faint leakage current signal, including current sensor, power amplifier and circuit acquisition module, the current sensor includes a toroidal shell, a magnetic core and a diskette, rotating around a first coil winding and a second coil winding is equipped on magnetic core, magnetic flux density direction caused by second coil winding is contrary with the magnetic flux density of the first coil winding.The present invention is using diskette as technological core, it is to be acquired using contactless to lightning arrester leakance, it thereby may be ensured that acquisition 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.

Description

It is core to the acquisition unit of contactless faint leakage current signal using diskette

Technical field

The present invention relates to UHVDC Transmission Lines arrester state inspections, refer in particular to one kind using diskette as core To the acquisition unit of contactless faint leakage current signal.

Background technique

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 route, " 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 inverter by direct current transportation, is then sent by DC power transmission line to receiving end And alternating current is become by inverter, finally inject AC network.The voltage class concept of extra-high voltage direct-current transmission with exchange it is defeated Electricity is different.For ac transmission, 220kV and voltage class below are generally known as high pressure, the title of 330~750kV For 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 high 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 transmission can have a large amount of big load centers of electric power direct sending defeated since centre is without drop point It 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 and the technologies such as runs and show Model engineering is rapidly developed and is widely applied in recent years, so that China is in the world in UHV transmission technical field and has led 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, 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 face Long-pending and cost.It is most important for the Insulation Coordination of optimization system and reduction project cost to improve protection of arrester level.It grasps Direct current arrester real-time running state and protection feature are to reinforcing the operational management of direct-current ultra high voltage transmission system equipment, improve it 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 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.It is huge caused by avoiding because of accident in order to find dampness, aging and other hidden danger of direct current arrester in time Economic loss carries out ultra-high voltage lightning arrester while improving ultra-high voltage lightning arrester product reliability, strengthening quality control Line monitoring is significant and is in urgent need.A kind of inspection for being directed to UHVDC Arrester leakage current is especially needed in a hurry Survey device and detection method.

Chinese utility model patent (CN202693723U) discloses a kind of leakage current of an arrester alarm system, including keeps 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 the power supply of the first warning device, and first voltage turns Changing circuit connection has second voltage conversion circuit to carry out secondary voltage conversion, and second voltage conversion circuit is the confession of the second warning device Electricity.Although the above leakage current alarm system principle is simple, warning note effect is obvious, however in the actual use process also Have 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 technical requirements of leakage current alarm system are unable to satisfy 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.

Summary of the invention

It is core to the acquisition unit of contactless faint leakage current signal, main mesh that the present invention, which is provided using diskette, Be overcome existing leakage current alarm system that can not carry out stable and accurate inspection to UHVDC Arrester leakage current The defect of survey.

In order to solve the above technical problems, the present invention adopts the following technical scheme:

It is core to the acquisition unit of contactless faint leakage current signal, including current sensor, function using diskette Rate amplifier and circuit acquisition module, the current sensor include the magnetic core and one of a toroidal shell, a C-shaped arrangement Diskette sensor, is provided with an accommodating space in the toroidal shell, on the magnetic core rotating around be equipped with a first coil around Group and a second coil winding, and magnetic core installation is in the accommodating space, and the diskette sensor is also installed in In the accommodating space and its both ends and the both ends of the magnetic core are adjacent, the input terminal and arrester of the first coil winding Leakage current electrical connection, the input terminal of the second coil winding are electrically connected with an output end of the power amplifier, the function Another output end of rate amplifier is electrically connected with the circuit acquisition module, magnetic flux density caused by the second coil winding Direction is contrary with the magnetic flux density of the first coil winding.

Further, the diskette sensor includes that the diskette of an arc-shaped arrangement is connected to the number on the diskette According to contact, the power amplifier include one be electrically connected with the data contacts output end operational amplifier, one the 1st pole Pipe, one second triode and an input power, the collector of first triode are being electrically connected to the input power just The collector of interface, second triode is connected to the negative interface of the input power, the output end of the power amplifier It is divided into two-way, is connected to the base stage of first triode all the way, another way is connected to the base stage of second triode, described The amplifying stage of first triode is divided into two-way, is connected to the input terminal of the second coil winding all the way, and another way is connected to institute The amplifying stage of the second triode is stated, the circuit acquisition module includes the survey that one end is connected to the second coil winding output end Measure resistance R1 and the ammeter for measuring current values in the measurement resistance, the other end ground connection of the measurement resistance R1.

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 pass through on fixing pipe set in the two sides of the abutted position.

Further, the arc pellet is arc pellet made of nano amorphous material, and the fixing pipe is that nanometer is non- Brilliant material fixing pipe.

Further, the arc pellet is arc pellet made of amorphous soft magnetic material, and the fixing pipe is that amorphous is soft Magnetically fixed pipe.

Further, the both ends of the diskette are respectively connected to one end of an arc pellet, shared by the diskette According to volume be the accommodating space volume a quarter, volume occupied by the fixing pipe is the accommodating space volume A quarter, it is described for not putting on volume occupied by the part of fixing pipe in the arc pellet of the fixing pipe side The a quarter of accommodating space volume is not put on shared by the part of fixing pipe in the arc pellet of the fixing pipe other side According to volume be the accommodating space volume a quarter, the second coil winding include upper second coil around portion and under For second coil around portion, upper second coil is set around around portion does not put on fixation in the arc pellet of the fixing pipe side The part of pipe, lower second coil is set around around portion does not put on fixing pipe in the arc pellet of the fixing pipe other side Part, upper second coil is electrically connected to each other around portion and lower second coil around portion, and the first coil winding is set around institute State the outside of fixing pipe.

Further, the input terminal of the first coil winding adds inert-gas diode and TVS diode, should TVS diode differential concatenation ground connection.

Compared to the prior art, the beneficial effect that the present invention generates is:

1, the configuration of the present invention is simple, 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 on diskette sensor, and the voltage signal that diskette sensor generates is put through power So that generating Contrary compensation electric current in second coil winding, the magnetic flux and arrester that compensation electric current generates leak electricity for big device conducting effect Flow direction caused by electric current on the contrary, when both realize magnetic balance after, core flux zero compensates electricity in second coil winding Stream is using the direct current signal value after the test of circuit acquisition module to get leakage current of an arrester out, thus the present invention is to adopt Lightning arrester leakance is acquired with contactless, thereby may be ensured that acquisition unit can be had in complex electromagnetic fields Effect and steadily run, not only voltage endurance capability is greatly promoted, and can under overvoltage have stronger self- recoverage and Adaptive ability.

It 2, is in the present invention, that modularization of the core sensing element for isolation detection electric current produces by utilizing diskette Product, its working principle are generated around conducting wire that is, when electric current flows through the straight wire of a root long using magnetic balance type principle Magnetic field, the size in magnetic field is directly proportional to the size of current for flowing through conducting wire, this magnetic field can be assembled by soft magnetic materials, then It is detected with diskette, it, can since the variation in magnetic field and the output voltage signal of diskette have good linear dependence The output signal measured using diskette directly reflects the size of current in conducting wire, and the advantage of diskette is its Strong anti-interference ability, low temperature float and highly sensitive, and especially in the range of electric current is -1A to 1A electric current, diskette is in magnetic Good symmetry and sensitivity are showed in terms of flux density.

3, in the present invention, after by loading upper AC signal on diskette, the magnetic flux density of diskette will be just To with reversely magnetize and demagnetize back and forth, external electromagnetic field can be interrupted to the magnetic polarization process of magnetic material in this process.So It can be very good to avoid the magnetic polarization of magnetic material.Be conducive to improve detection accuracy and service life of the invention.

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 diode prevent high current destroy circuit system.Since the TVS diode starting time is fast, but It is that electric discharge continuous capability is poor；And the starting 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 the influence of magnetic polarization to magnetic material, it is also possible to shadow Ring the steady operation of electronic circuit.So the present invention can also realize electromagnetism from wire laying mode, structure design and shell processing aspect Isolation, the functions such as decoupling filtering, to enable a system to long-time steady operation.By the way that shield shell and insulation shell is arranged, The magnetic flux leakage for having advantageously reduced magnetic core, correspondinglys increase measurement accuracy, at the same can also effective shield perimeter electromagnetic field interference, subtract Few measurement error.

6, in the present invention, current sensor is by nano amorphous material, diskette, nano amorphous material fixing pipe and shielding Shell is constituted.In order to facilitate the installation of, nano amorphous material is made into HALF structure by us.It is installed in nano amorphous material It is fixed afterwards using fixing pipe, to guarantee that the material can be docked preferably sensor at work.The present invention is selecting magnetic material When material, the problem of having fully taken into account heavy current impact.So we select nano amorphous and amorphous soft magnet as current sense The core material of device.Amorphous soft magnet and nano amorphous material have good recovery capability, in the heavy current impact for bearing moment Later, it can be very good to restore.

7, in the present invention, when the direct current signal of arrester leakage current generates in magnetic core after first coil winding Magnetic field be focused on diskette, diskette, which senses, will generate voltage after this part magnetic flux density, what diskette generated Amplification of the voltage signal through operational amplifier completes the control of discharge to input power, so that the positive interface of input power Contrary compensation electric current, magnetic caused by the magnetic flux and arrester leakage current that compensation electric current generates are exported in second coil winding Lead to contrary control by operational amplifier to Contrary compensation electric current, making the magnetic flux density in magnetic core is always definite value, this When second coil winding on compensation electric current using measurement resistance R1 after be input to ground, by ammeter to measurement resistance R1 The current values of interior circulation, and carrying out scale operation according to the current values is the direct current signal for obtaining leakage current of an arrester Value, not only circuit structure is simple for the above detection process, preparation cost is low, but also detection accuracy is high, can guarantee signal detection Precision.

Detailed description of the invention

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 principle sketch of the data acquisition unit.

Fig. 6 is the diskette and Hall material current-magnetic flux density profile comparison schematic diagram.

Fig. 7 is the diskette and Hall material temperature drift curve comparison schematic diagram.

Fig. 8 is that current densities comparison schematic diagram after AC signal is loaded on diskette.

Fig. 9 is the schematic block circuit diagram of embodiment two in the present invention.

Specific embodiment

Illustrate a specific embodiment of the 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 transmitting unit 5 and public network signal receiving unit 6 can be with Data transmission is realized by mobile public network (GSM network or GPRS network), and public network signal receiving unit 6 is preferred in the present embodiment The modem of GSM network or GPRS network, the communication mould of the preferred GSM network of public network signal transmitting unit 5 or GPRS network Block.The central monitoring device includes background processor 40 and reservoir 41, the input terminal connection of the background processor 40 In the data sink, the output end of the background processor 40 is connected to the mobile terminal 3 and above-mentioned storage Storage 41, the input terminal of the background processor 40 are also connected with an encryption unit 42, the output end connection of the reservoir 41 There is a terminal display 43.The enable end of the data sink is connected to the output end of the data sending device, described The enable end 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 end 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 of maintenance personal's electric shock is reduced, and reduces the time needed for restoring 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 is generallyd include through the Cloud Server (the as described central monitoring device) of net connection, cloud client (as institute State mobile terminal 3) and at least one measuring terminals (be as 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).When the system operates normally, measuring terminals pass through net connection for 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 Out, utilization, assessment etc. operate, and realize the impossible association to the associated objects for being located at Different field of conventional measurement techniques It adjusts or correlation measurement is realized so as to shorten time of measuring and multiple measuring terminals carried out with real time monitoring simultaneously 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 an acquisition protective 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 protective 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 end, another way be connected to it is described acquisition protective module 14 enable end, it is described acquisition protective module 14 output end connect It is connected to the enable end of the protection circuit unit 12, the enable end 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 protective module 14 is failure to actuate, and data acquisition unit 10 starts and carries out signal acquisition to electric current It is exported with being passed through after data processing by data processing unit 11；When arrester electric current is greater than 1 milliampere hour, data acquisition unit 10 is not It is dynamic, and the starting of protective module 14 is acquired, high-impedance state is presented in 1 pair of input of the detection device, 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 and Fig. 4.The data acquisition unit 10 includes current sensor 7, power amplifier 8, electricity Road acquisition module 9.

Referring to Fig.1, Fig. 2, Fig. 3 and Fig. 4.The current sensor 7 includes the magnetic of a toroidal shell 70, a C-shaped arrangement Core 71 and a diskette sensor 72, are provided with an accommodating space 700 in the toroidal shell 70, on the magnetic core 71 respectively It is arranged with a first coil winding 710 and a second coil winding 711, and the magnetic core 71 is installed on the accommodating space In 700, the diskette sensor 72 is also installed in the accommodating space 700 and the both ends at its both ends and the magnetic core 71 Adjacent, the input terminal of the first coil winding 710 is electrically connected with lightning arrester leakance, the second coil winding 711 it is defeated Enter end to be electrically connected with an output end of the power amplifier 8, another output end and the circuit of the power amplifier 8 are adopted Collect module 9 to be electrically connected, magnetic flux density direction caused by the second coil winding 711 and the first coil winding 710 Magnetic flux density is contrary.

Referring to Fig.1, Fig. 2, Fig. 3 and Fig. 4.The diskette sensor 72 includes that the diskette 720 of an arc-shaped arrangement connects The data contacts 721 being connected on the diskette 720, the power amplifier 8 include one and 721 output end of the data contacts electricity The operational amplifier 80 of connection, one first triode 81, one second triode 82 and an input power 83, the one or three pole The collector of pipe 81 is electrically connected to the positive interface 830 of the input power 83, and the collector of second triode 82 is connected to The output end of the negative interface 831 of the input power 83, the power amplifier 8 is divided into two-way, is connected to described first all the way The base stage of triode 81, another way are connected to the base stage of second triode, and the amplifying stage of first triode 81 is divided into Two-way, is connected to the input terminal of the second coil winding 711 all the way, and another way is connected to the amplification of second triode 82 Grade, the circuit acquisition module 9 include the measurement resistance R1 and use that one end is connected to 711 output end of second coil winding In the ammeter A for measuring current values in the measurement resistance, the other end ground connection of the measurement resistance R1.When arrester electric leakage electricity The magnetic field that the direct current signal of stream generates in magnetic core 71 after first coil winding 710 is focused on diskette sensor, The voltage signal that diskette sensor generates is acted on through power amplifier conducting so that generating Contrary compensation in second coil winding 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 balance Afterwards, core flux zero, in second coil winding compensation electric current using after the test of circuit acquisition module to get arrester out The direct current signal value of leakage current, thus one aspect of the present invention is to be acquired using contactless to lightning arrester leakance, from And can guarantee that acquisition unit can effectively and stably be run in complex electromagnetic fields, not only voltage endurance capability obtains very big Ground is promoted, and can have stronger self- recoverage and adaptive ability under overvoltage.Another aspect of the present invention can be to microampere The faint circuit signal of the order of magnitude carries out online acquisition, and can be monitored in direct current arrester and be leaked at any time by central monitoring device The equipment such as lightning protection telecommunications or electrical and electronics board can be effectively prevented because connecing in the variation of electric current, harmonic wave and electrostatic etc. Ground resistance value is excessively high, influences the earthing effect of lightning stroke, effectively prevents the damage and injures and deaths that cause building and people and animals, and have Conducive to the service life for extending arrester.It is core sensing element for isolation detection electric current that the present embodiment, which also utilizes diskette, Modular product, its working principle are using magnetic balance type principle, i.e., when electric current flows through the straight wire of a root long, in conducting wire Around generate magnetic field, the size in magnetic field is directly proportional to the size of current for flowing through conducting wire, this magnetic field can by soft magnetic materials come Aggregation, is then detected with diskette, since the variation in magnetic field and the output voltage signal of diskette have good linear pass System, therefore the output signal measured using diskette, directly reflect the size of current in conducting wire, and the advantage of diskette It is its strong anti-interference ability, low temperature floats and highly sensitive, soft especially in the range of electric current is -1A to 1A electric current Magnetic sheet shows good symmetry and sensitivity in terms of magnetic flux density.

Referring to Fig.1, Fig. 2, Fig. 3 and Fig. 4.The toroidal shell 70 is including a shield shell 701 and is set to the shielding The insulation shell 702 in 701 outside of shell, the magnetic core 71 include two symmetrically arranged arc pellets 714 and a fixing pipe 715, two arc pellets 714 are respectively mutually abutted with one end, and pass through 715 sets of the fixing pipe in the two sides of the abutted position On, the arc pellet 714 is arc pellet 714 made of nano amorphous material, and the fixing pipe 715 is nano amorphous material Fixing pipe 715.Current sensor is made of nano amorphous material, diskette, nano amorphous material fixing pipe and shielding shell.For Facilitate installation, nano amorphous material is made into HALF structure by us.Fixation is used after nano amorphous material installs Pipe is fixed, to guarantee that the material can be docked preferably sensor at work.The present invention is sufficiently examined when selecting magnetic material The problem of having considered heavy current impact.So we select nano amorphous and magnetic core material of the amorphous soft magnet as current sensor Material.Amorphous soft magnet and nano amorphous material have good recovery capability, can be very after the heavy current impact for bearing moment Good recovery.

Referring to Fig.1, Fig. 2, Fig. 3 and Fig. 4.The both ends of the diskette 720 are respectively connected to the one of an arc pellet 714 End, volume occupied by the diskette 720 are a quarter of 700 volume of accommodating space, shared by the fixing pipe 715 According to volume be 700 volume of accommodating space a quarter, in the arc pellet 714 of 715 side of fixing pipe The a quarter that volume occupied by the part of fixing pipe 715 is 700 volume of accommodating space is not put on, is located at the fixation Not putting on volume occupied by the part of fixing pipe 715 in the arc pellet 714 of 715 other side of pipe is the accommodating space 700 The a quarter of volume, the second coil winding 711 include upper second coil around portion and lower second coil around portion, it is described on Second coil is set around the part for not putting on fixing pipe 715 in the arc pellet 714 of 715 side of fixing pipe around portion, Lower second coil is set around around portion does not put on fixing pipe 715 in the arc pellet 714 of 715 other side of fixing pipe Part, upper second coil is electrically connected to each other around portion and lower second coil around portion, and the first coil winding 710 is set around The outside of the fixing pipe 715.

Referring to Fig.1, Fig. 2, Fig. 3 and Fig. 4.Added in the extraction wire of the arrester electric current inert-gas diode with And TVS diode, TVS diode differential concatenation ground connection.The present embodiment all lead-in conductors, extraction wire and other have must Installation inert-gas diode and TVS diode, which may be selected, in the part wanted prevents high current from destroying circuit system.Due to It is fast that TVS diode starts the time, but the continuous capability that discharges is poor；And the starting time of inert-gas diode is slow, electric discharge is held Continuous ability 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 and Fig. 4.AC signal is loaded on the diskette 720 and/or magnetic core 71.By After loading upper AC signal on diskette, the magnetic flux density of diskette will magnetize and demagnetize back and forth in forward and reverse, at this A process can interrupt external electromagnetic field to the magnetic polarization process of magnetic material.So can be very good to avoid the magnetic pole of magnetic material Change.Be conducive to improve detection accuracy and service life of the invention.

Referring to Fig.1, Fig. 2, Fig. 3 and Fig. 4.The toroidal shell 70 be set on the ground wire 16 of arrester and it include can The left shell half body 705 and right half-shell body 706 mutually dismantled.

Referring to Fig.1, Fig. 2, Fig. 3 and Fig. 4.When arrester leakage current direct current signal after first coil winding in magnetic The magnetic field generated in core is focused on diskette, and diskette will generate voltage, soft magnetism after sensing this part magnetic flux density Amplification of the voltage signal through operational amplifier that piece 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, by control of the operational amplifier to Contrary compensation electric current For definite value, electric current is compensated in second coil winding at this time using ground is input to after measurement 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, preparation cost is low, but also detection accuracy is high, can guarantee Signal detection precision.

In addition, since complicated electromagnetic field is other than it can cause the influence of magnetic polarization to magnetic material, it is also possible to influence electricity The steady operation of sub-circuit.So the present invention can also realize electromagnetic isolation from wire laying mode, structure design and shell processing aspect, The functions such as decoupling filtering, to enable a system to long-time steady operation.By setting shield shell and insulation shell, be conducive to The magnetic flux leakage for reducing magnetic core, correspondinglys increase measurement accuracy, at the same can also effective shield perimeter electromagnetic field interference, reduce measurement Error.

Referring to Fig.1, Fig. 2, Fig. 3 and Fig. 4.The online detecting of the corresponding UHVDC Arrester leakage current of the present embodiment Method, comprising 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- pole 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 diskette sensor 72, and the voltage signal that diskette sensor 72 generates is through function 8 conducting effect of rate amplifier so that in second coil winding 711 generate Contrary compensation electric current, compensation electric current generate magnetic flux with keep away Flow direction caused by thunder device leakage current on the contrary, when both realize magnetic balance after, 71 magnetic flux of magnetic core is zero, the second coil around Group 711 on compensation electric current using after the test of circuit acquisition module 9 to get the direct current signal value of leakage current of an arrester out from And enter next step.More specifically, when arrester leakage current direct current signal after first coil winding 710 in magnetic core The magnetic field generated in 71 is focused on diskette 720, and diskette 720 will generate electricity after sensing this part magnetic flux density Pressure, amplification of the voltage signal through operational amplifier 80 that diskette 720 generates complete the electric discharge control to input power 83 System, so that the positive interface 830 of input power 83 exports Contrary compensation electric current in second coil winding 711, compensation electric current is generated Magnetic flux and arrester leakage current caused by flow direction on the contrary, pass through control of the operational amplifier 80 to Contrary compensation electric current System, making the magnetic flux density in magnetic core 71 is always definite value, compensates electric current in second coil winding 711 at this time using measurement resistance It is input to ground after R1, by ammeter A to the current values to circulate in measurement resistance R1, and is carried out according to the current values Scale operation is the direct current signal value for obtaining leakage current of an arrester, hence into next step.

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 transmitting 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 the current data sends corresponding arrester management for current data distribution simultaneously After the mobile terminal 3 of person, specially background processor 40 receive the short message of coding form, information conversion is carried out, will be encoded 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, has and be loaded with exchange on the diskette 720 and/or magnetic core 71 Signal, after upper AC signal is loaded on diskette 720 and/or magnetic core 71, the magnetic flux of diskette 720 and/or magnetic core 71 is close Degree will magnetize and demagnetize back and forth in forward and reverse, can interrupt magnetic polarization of the external electromagnetic field to magnetic material in this process Journey.

Referring to Fig. 5.Testing principle of the invention specifically includes: electric current I1 and I2 are generated on two windings respectively The opposite magnetic flux density of B1 and B2 both direction, the two magnetic flux densities offset each other in diskette sensor position.Then The size that I2 is adjusted according to the collected magnetic field of precision electromagnetic sensor, makes B1+B2 definite value.Then measure I2's Stool and urine is known that the size of I1.The core of part of data acquisition is diskette sensor.The applicant adjusts after study It looks into, magnetic field acquisition method can be using hall device, but hall device nonlinear degree is larger, anti-interference ability is extremely weak, It is low to small signal sensitivity, so not being available in the UHVDC Arrester equipment.Therefore, in the present embodiment, magnetic Field collector uses special soft magnetic materials, and the advantage of soft magnetic materials is its strong anti-interference ability, and low temperature floats and high sensitivity.

Referring to Fig. 6.As seen from Figure 6, diskette electric current be -1A to 1A electric current in the range of, in magnetic flux density Aspect shows good symmetry and sensitivity.

Referring to Fig. 7.Fig. 7 is the temperature drift curve of soft magnetic materials and Hall sensor.In Fig. 7 we can see that Soft magnetic materials temperature drift at -40 degrees Celsius to 100 degrees Celsius is very small, this illustrates that soft magnetic materials can be relatively severe In the environment of work.Within the temperature range of -40 degrees Celsius to 100 degrees Celsius, current acquisition is made using soft magnetic materials When device, error will be less than 2%.

Referring to Fig. 8.Fig. 8 is the case where loading AC signal to diskette.It is submitted as can be seen that being loaded on diskette After flowing signal, the magnetic flux density of diskette will magnetize and demagnetize back and forth in forward and reverse, can interrupt outside in this process Magnetic polarization process of the electromagnetic field to magnetic material.So can be very good to avoid the magnetic polarization of magnetic material.

In addition, soft magnetic materials used in the present embodiment test is the NS358 material provided by former Shanghai Steel and Iron Research Institute Material, however repeatedly tested by the applicant, diskette made from other kinds of soft magnetic materials can also complete this item application Purpose.And nano amorphous material is provided by magnetisable material and device key lab of the Chinese Academy of Sciences.Also pass through the application People repeatedly tests, and magnetic core made from other kinds of nano amorphous material can also complete the purpose of this item application.

Embodiment two

The present embodiment and the embodiment of embodiment one are substantially the same, the difference is that: the data sending device Including being in sequentially connected emission of radio frequency signals unit 50, frequency modulation retransmission unit 51 and dual mode communication unit 52, the data Reception device is the public network signal receiving unit 6 connecting 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, applicable situation of the invention can be widened significantly in this way, so that being located in some remote mountains or thick forest Direct current arrester the information of its leakage current can also be detected with real-time online.

The present embodiment passes through the cooperation of emission of radio frequency signals unit and frequency modulation retransmission unit, can automatically select in frequency range 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 data processing unit after data operation processing, will contain leakage current of an arrester Direct current signal value, time of measuring or arrester installation site information coding turned by emission of radio frequency signals unit and frequency modulation The cooperation of bill member is passed through encoded information in a manner of private network automatic frequency-hopping in the smooth situation for guaranteeing communication channel 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 includes the short message that background processor receives coding form, information conversion is carried out, it will Encoded 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 above is only a specific embodiment of the present invention, but the design concept of the present invention is not limited to this, all to utilize this Design makes a non-material change to the present invention, and should all belong to behavior that violates the scope of protection of the present invention.

Claims (6)

1. being core to the acquisition unit of contactless faint leakage current signal using diskette, it is characterised in that: including electric current Sensor, power amplifier and circuit acquisition module, the current sensor include a toroidal shell, a C-shaped arrangement Magnetic core and a diskette sensor, are provided with an accommodating space in the toroidal shell, rotating around being equipped with one on the magnetic core First coil winding and a second coil winding, and magnetic core installation is in the accommodating space, the diskette sensing Device is also installed in the accommodating space and its both ends and the both ends of the magnetic core are adjacent, the input of the first coil winding End is electrically connected with lightning arrester leakance, and the input terminal of the second coil winding and an output 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, produced by the second coil winding Magnetic flux density direction it is contrary with the magnetic flux density of the first coil winding；The toroidal shell includes a shield shell And it is set to the insulation shell on the outside of the shield shell, the magnetic core includes that two symmetrically arranged arc pellets and one are solid Fixed pipe, two arc pellets are respectively mutually abutted with one end, and are passed through on fixing pipe set in the two sides of the abutted position；It is described The left shell half body and right half-shell body that toroidal shell, which is set on the ground wire of arrester, and it includes mutually to dismantle；It is described soft Magnetic sheet sensor includes the diskette of an arc-shaped arrangement and the data contacts that are connected on the diskette, the power amplifier Operational amplifier, one first triode, one second triode and one being electrically connected including one with the data contacts output end Input power, the collector of first triode are electrically connected to the positive interface of the input power, second triode Collector is connected to the negative interface of the input power, and the output end of the operational amplifier is divided into two-way, is connected to institute all the way The base stage of the first triode is stated, another way is connected to the base stage of second triode, the amplification fraction of first triode At two-way, it is connected to the input terminal of the second coil winding all the way, another way is connected to the amplifying stage of second triode, The circuit acquisition module includes that one end is connected to the measurement resistance R1 of the second coil winding output end and for measuring The ammeter of current values in the measurement resistance, the other end ground connection of the measurement resistance R1.

2. it is as described in claim 1 core to the acquisition unit of contactless faint leakage current signal using diskette, it is special Sign is: the arc pellet is arc pellet made of nano amorphous material, and the fixing pipe is that nano amorphous material is fixed Pipe.

3. it is as described in claim 1 core to the acquisition unit of contactless faint leakage current signal using diskette, it is special Sign is: the arc pellet is arc pellet made of amorphous soft magnetic material, and the fixing pipe is amorphous soft magnet fixing pipe.

4. it using diskette is core to the acquisition unit of contactless faint leakage current signal as described in Claims 2 or 3, It is characterized by: the both ends of the diskette are respectively connected to one end of an arc pellet, body occupied by the diskette Product is a quarter of the accommodating space volume, and volume occupied by the fixing pipe is four points of the accommodating space volume One of, not putting on volume occupied by the part of fixing pipe in the arc pellet of the fixing pipe side is that the accommodating is empty Between volume a quarter, do not put on body occupied by the part of fixing pipe in the arc pellet of the fixing pipe other side Product is a quarter of the accommodating space volume, and the second coil winding includes upper second coil around portion and lower second line For circle around portion, upper second coil is set around the portion for not putting on fixing pipe in the arc pellet of the fixing pipe side around portion Divide, lower second coil is set around the portion for not putting on fixing pipe in the arc pellet of the fixing pipe other side around portion Point, upper second coil is electrically connected to each other around portion and lower second coil around portion, and the first coil winding is set around described solid Determine the outside of pipe.

5. it is as claimed in claim 4 core to the acquisition unit of contactless faint leakage current signal using diskette, it is special Sign is: the input terminal of the first coil winding adds inert-gas diode and TVS diode, the TVS diode Differential concatenation ground connection.

6. it is as claimed in claim 5 core to the acquisition unit of contactless faint leakage current signal using diskette, it is special Sign is: being loaded with AC signal on the diskette and/or magnetic core.