CN205103296U - Detection apparatus for reveal electric current with non - contact pick up to special high voltage direct current arrester - Google Patents
Detection apparatus for reveal electric current with non - contact pick up to special high voltage direct current arrester Download PDFInfo
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- CN205103296U CN205103296U CN201520740922.6U CN201520740922U CN205103296U CN 205103296 U CN205103296 U CN 205103296U CN 201520740922 U CN201520740922 U CN 201520740922U CN 205103296 U CN205103296 U CN 205103296U
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Abstract
Detection apparatus for reveal electric current with non - contact pick up to special high voltage direct current arrester, including the data acquisition unit, the data processing unit, protection circuit unit and electrical unit, the data acquisition unit includes current sensor, power amplifier and circuit collection module, current sensor includes an annular housing, one is a magnetic core and the accurate magnetism electric sensor that C shape was arranged, be provided with an accommodation space in the annular housing, respectively around being equipped with a first coil winding and a second coil winding on the magnetic core, and this magnetic core install in in the accommodation space, the produced flux density orientation of second coil winding with the flux density opposite direction of first coil winding. The utility model discloses a non -contact gathers the arrester leakage current to can guarantee that acquisition unit can go on effectively and steadily moving in complicated electromagnetic field, not only seal pressure obtains promoting very bigly, can have under the overvoltage in addition than strong self -resuming with from adaptability.
Description
Technical field
The utility model relates to UHVDC Transmission Lines lightning arrester state inspection, refers in particular to the pick-up unit of non-contact sensor to UHVDC Arrester Leakage Current.
Background technology
Along with China's rapid economic development, electricity needs increases swift and violent, and there is electric power resource distribution and the unmatched natural characteristic in load center region in China, need to improve imbalance between power supply and demand problem by remote, large capacity transmission circuit, the engineering such as " transferring electricity from the west to the east ", " north and south supplies mutually " is present stage major deployments scheme, and extra-high voltage direct-current transmission technology is concrete enforcement technological means.
Alternating current is transformed into direct current by transverter by direct current transportation, then delivers to receiving end by DC power transmission line and becomes alternating current by transverter, finally injecting AC network.The electric pressure concept of extra-high voltage direct-current transmission and ac transmission different.For ac transmission, generally 220kV and following electric pressure are called high pressure, 330 ~ 750kV is called UHV (ultra-high voltage), 1000kV and above be called extra-high voltage.Direct current transportation is then slightly different, and ± more than 100kV is referred to as high pressure; ± 500kV and ± 600kV is still called high pressure, is not generally called UHV (ultra-high voltage); Exceed ± 600kV be then called extra-high voltage.
± 800kV extra-high voltage direct-current transmission is because centre is without drop point, can by the large load center of a large amount of electric power direct sendings, there is the advantages such as transmission capacity is large, power transmission distance, saving transmission of electricity stringing corridor, relevant device research and development, to control and the technology such as operation and demonstration project to be rapidly developed and widespread use in the last few years, Yi Shi China is in rank first in UHV transmission technical field, leads technological development direction and key equipment Development Trend.
The construction of extra-high voltage DC transmission system, be unable to do without overvoltage protection, direct current arrester is the key equipment of extra-high voltage DC transmission system overvoltage protection, determines the dielectric level of whole system, affects equipment volume, project occupation of land area and cost.Improve protection of arrester level for the Insulation Coordination of optimization system and to reduce construction costs most important.Grasp direct current arrester real-time running state and protection feature to strengthen direct-current ultra high voltage transmission system equipment operational management, improve its live detection technology and the horizontal tool of repair based on condition of component is of great significance.
For now, the service condition of direct current arrester is much harsher than alternating-current lightning arrestor, and the technical requirement proposed the runnability of direct current arrester is very high.Direct current arrester structure, condition of work, action principle, protection feature etc. are all different from alternating-current lightning arrestor.In order to the making moist of Timeliness coverage direct current arrester, aging and other hidden danger, avoid because accident causes tremendous economic to lose, raising ultra-high voltage lightning arrester product reliability, strengthen quality control while, ultra-high voltage lightning arrester is carried out that on-line monitoring is significant and demand is urgent.Particularly eager needs are a kind of is directed to non-contact sensor the pick-up unit of UHVDC Arrester Leakage Current and detection method.
Chinese utility model patent (CN202693723U) discloses a kind of leakage current of an arrester warning system, comprise lightning arrester sum counter, lightning arrester is connected with the first current transformer for switching current and the second current transformer, first current transformer is connected with reference voltage circuit, reference voltage is added on the first voltage conversion circuit by reference voltage circuit, second current transformer is connected with the first voltage conversion circuit, first voltage conversion circuit is that the first warning device is powered, first voltage conversion circuit is connected with the second voltage conversion circuit and carries out secondary voltage conversion, second voltage conversion circuit is that Secondary Report alarm device is powered.Although above Leakage Current warning system principle is simple, alarm effect is obvious, but also have the following disadvantages in the use procedure of reality: 1, above Leakage Current warning system is mainly in transmission line of alternation current, because the service condition of lightning arrester in extra high voltage direct current transmission line is much harsher than alternating-current lightning arrestor, particularly require also to be difficult to reach in the self-shield of Lightning Over-voltage, thus the technical requirement of Leakage Current warning system cannot meet and carries out effectively and stably running in extra high voltage direct current transmission line; 2, above Leakage Current warning system major function carries out qualitative operation, cannot detect the large decimal fractions of Leakage Current in all the time.
Utility model content
The utility model provides with the pick-up unit of non-contact sensor to UHVDC Arrester Leakage Current, and its fundamental purpose is that overcoming existing Leakage Current warning system cannot carry out defect that is stable and that accurately detect to UHVDC Arrester Leakage Current.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
With the pick-up unit of non-contact sensor to UHVDC Arrester Leakage Current, comprise data acquisition unit, data processing unit, protection circuit unit and power supply unit, described data acquisition unit comprises current sensor, power amplifier and circuit acquisition module, described current sensor comprises an annular casing, the magnetic core of one c-shaped layout and a precision electromagnetic sensor, an accommodation space is provided with in described annular casing, described magnetic core is arranged with respectively one first coil winding and one second coil winding, and this magnetic core is installed in described accommodation space, described precision electromagnetic sensor is also installed in described accommodation space and the two ends of its two ends and described magnetic core and adjoins, the input end of described first coil winding is electrically connected with lightning arrester leakance, the input end of described second coil winding is electrically connected with an output terminal of described power amplifier, another output terminal of described power amplifier is electrically connected with described circuit acquisition module, the magnetic flux density direction that described second coil winding produces is contrary with the magnetic flux density direction of described first coil winding.
Further, the diskette that described precision electromagnetic sensor comprises a curved layout is connected to the data contacts on this diskette, described power amplifier comprises an operational amplifier be electrically connected with described data contacts output terminal, one first triode, one second triode and an input power, the collector of described first triode is electrically connected on the positive interface of described input power, the collector of described second triode is connected to the negative interface of described input power, the output terminal of described power amplifier is divided into two-way, one tunnel is connected to the base stage of described first triode, another road is connected to the base stage of described second triode, the amplifying stage of described first triode is divided into two-way, one tunnel is connected to the input end of described second coil winding, another road is connected to the amplifying stage of described second triode, described circuit acquisition module comprises one end and is connected to the described measuring resistance R1 of the second coil winding output terminal and the reometer for measuring current values in this measuring resistance, the other end ground connection of described measuring resistance R1.
Further, the insulation shell that described annular casing comprises a shield shell and is arranged at outside this shield shell, described magnetic core comprises two symmetrically arranged arc pellets and a stationary pipes, two arc pellets respectively abut mutually with one end, and described stationary pipes on the cover of the both sides of this abutted position, described arc pellet is the arc pellet that nano amorphous material is made, and described stationary pipes is nano amorphous material stationary pipes.
Further, the insulation shell that described annular casing comprises a shield shell and is arranged at outside this shield shell, described magnetic core comprises two symmetrically arranged arc pellets and a stationary pipes, two arc pellets respectively abut mutually with one end, and described stationary pipes on the cover of the both sides of this abutted position, described arc pellet is the arc pellet that amorphous soft magnetic material is made, and described stationary pipes is amorphous soft magnet stationary pipes.
Further, the two ends of described diskette are respectively connected to one end of arc pellet described in, volume occupied by described diskette is 1/4th of described accommodation space volume, volume occupied by described stationary pipes is 1/4th of described accommodation space volume, the volume occupied by part that the arc pellet being arranged in described stationary pipes side does not put stationary pipes is 1/4th of described accommodation space volume, the volume occupied by part that the arc pellet being arranged in described stationary pipes opposite side does not put stationary pipes is 1/4th of described accommodation space volume, described second coil winding comprises the second coil around portion and lower second coil around portion, described upper second coil is set around the part that the arc pellet being arranged in described stationary pipes side does not put stationary pipes around portion, described lower second coil is set around the part that the arc pellet being arranged in described stationary pipes opposite side does not put stationary pipes around portion, described upper second coil is electrically connected to each other around portion around portion and lower second coil, described first coil winding is set around the outside of described stationary pipes.
Further, described pick-up unit also comprises a collection protection module, the electric energy output end of described power supply unit is divided into four tunnels, be electrically connected on the electrical energy inputs of protection circuit unit respectively, gather the electrical energy inputs of protection module, the electrical energy inputs of data acquisition unit and the electrical energy inputs of data processing unit, the output terminal of lightning arrester electric current is divided into two-way, one tunnel is connected to the Enable Pin of described data acquisition unit, another road is connected to the Enable Pin of described collection protection module, the output terminal of described collection protection module is connected to the Enable Pin of described protection circuit unit, the Enable Pin of described data processing unit is provided with two-way, one tunnel connects the output terminal of described data acquisition unit, another road connects the output terminal of described protection circuit unit, when lightning arrester electric current is less than or equal to 1 MAH, collection protection module is failure to actuate, and data acquisition unit starts and through being exported by data processing unit after carrying out signals collecting and data processing to electric current, when lightning arrester electric current is greater than 1 MAH, data acquisition unit is motionless, and gathers protection module startup, and described pick-up unit presents high-impedance state to input, does not now carry out signals collecting and data processing, and exports via data processing unit.
Further, the extraction wire of described lightning arrester electric current adds inert-gas diode and TVS diode, this TVS diode differential concatenation ground connection.
Further, described diskette and/or magnetic core are loaded with AC signal.
Further, described annular casing be set in lightning arrester ground wire on and it comprises a left side half housing and right half housing that can mutually dismantle.
Further, the input end of described first coil winding adds inert-gas diode and TVS diode, this TVS diode differential concatenation ground connection.
Compared to the prior art, the beneficial effect that the utility model produces is:
1, the utility model structure is simple, practical, when the magnetic field that the direct current signal of lightning arrester leakage current produces after the first coil winding in magnetic core is aggregated on precision electromagnetic sensor, the voltage signal that precision electromagnetic sensor produces makes the second coil winding produces Contrary compensation electric current through power amplifier conducting effect, the magnetic flux that offset current produces is contrary with the flow direction that lightning arrester leakage current produces, after the two realizes magnetic balance, core flux is zero, in second coil winding, offset current is again after the test of oversampling circuit acquisition module, namely the direct current signal value of lightning arrester Leakage Current is drawn, thus the utility model adopts contactlessly to gather lightning arrester leakance, thus can ensure that collecting unit can carry out effectively and stably running in complex electromagnetic fields, not only voltage endurance capability is promoted greatly, and stronger self-recoverage and adaptive ability can be had under superpotential.
2, in the utility model, by utilizing diskette for core sensitive element is for the modular product of isolation detection electric current, its principle of work adopts magnetic balance type principle, namely when electric current flows through a long straight wire, magnetic field is produced around wire, the size in magnetic field is directly proportional to the size of current flowing through wire, this magnetic field can be assembled by soft magnetic material, then detect with diskette, because the change in magnetic field and the output voltage signal of diskette have good linear dependence, therefore the output signal that diskette records can be utilized, directly reflect the size of current in wire, and the advantage of diskette is its strong anti-interference ability, low temperature wafts and high sensitivity, particularly in the scope that electric current is-1A to 1A electric current, diskette presents good symmetry and sensitivity in magnetic flux density.
3, in the utility model, by load AC signal on diskette after, the magnetic flux density of diskette and oppositely will magnetize back and forth and demagnetize at forward, can interrupt the magnetic polarization process of external electromagnetic field to magnetic material in this process.So the magnetic polarization of magnetic material can well be avoided.Be conducive to improving accuracy of detection of the present utility model and serviceable life.
4, in the utility model, at all lead-in conductors, draw wire and other parts be necessary and all can select to install inert-gas diode additional and TVS diode prevents big current from destroying Circuits System.Because TVS diode is fast for start-up time, but discharge sustain ability is poor; And the start-up time of inert-gas diode is slow, discharge sustain ability is strong.Can be good at solving circuit protection problem so both use simultaneously.
5, in the utility model, complicated electromagnetic field, except causing the impact of magnetic polarization to magnetic material, also may affect the steady operation of electronic circuit.So the utility model also can from wire laying mode, structural design and shell process aspect realize electromagnetic isolation, the functions such as decoupling filtering, thus enable system long-time steady operation.By arranging shield shell and insulation shell, be conducive to the magnetic flux leakage decreasing magnetic core, corresponding raising measuring accuracy, simultaneously also can the interference of effective shield perimeter electromagnetic field, minimizing measuring error.
6, in the utility model, current sensor is made up of nano amorphous material, diskette, nano amorphous material stationary pipes and screening can.Conveniently install, nano amorphous material is made HALF structure by us.After nano amorphous material installs, use stationary pipes to fix, with ensure sensor operationally this material can dock preferably.The utility model, when selecting magnetic material, has fully taken into account the problem of heavy current impact.So we select nano amorphous and amorphous soft magnet as the core material of current sensor.Amorphous soft magnet and nano amorphous material have good recovery capability, after the heavy current impact bearing moment, can well recover.
7, in the utility model, the magnetic field produced in magnetic core after the first coil winding when the direct current signal of lightning arrester leakage current is aggregated on diskette, diskette will produce voltage after sensing this part magnetic flux density, the voltage signal that diskette produces has carried out the control of discharge to input power through the amplification of operational amplifier, the positive interface of input power is made to export Contrary compensation electric current in the second coil winding, the magnetic flux that offset current produces is contrary with the flow direction that lightning arrester leakage current produces, by the control of operational amplifier to Contrary compensation electric current, the magnetic flux density in magnetic core is made to be always definite value, now in the second coil winding, offset current is input to ground again after measuring resistance R1, by reometer to the current values circulated in measuring resistance R1, and carry out according to this current values the direct current signal value that namely scale operation draws lightning arrester Leakage Current, above testing process not only circuit structure is simple, preparation cost is low, and detection accuracy is high, input precision can be ensured.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of embodiment one in the utility model.
Fig. 2 is the structural representation of data acquisition unit described in the utility model.
Fig. 3 is the schematic block circuit diagram of each parts in Fig. 2.
Fig. 4 is the scheme of installation of annular casing described in the utility model.
Fig. 5 is the principle sketch of described data acquisition unit.
Fig. 6 is that described diskette compares schematic diagram with Hall material current-magnetic flux density profile.
To be described diskette with Hall material temperature drift about Fig. 7 that curve compares schematic diagram.
Fig. 8 is that load AC signal on diskette after, current densities compares schematic diagram.
Fig. 9 is the schematic block circuit diagram of embodiment two in the utility model.
Embodiment
Embodiment of the present utility model is described with reference to the accompanying drawings.
Embodiment one
With reference to Fig. 1.An online detecting system for UHVDC Arrester Leakage Current, comprises and one is arranged at pick-up unit 1 near direct current arrester, carries out data sending device, data sink, central monitoring device and the mobile terminal 3 that transmit for the Leakage Current testing result obtained by this pick-up unit 1.Described data sending device is public network signal transmitter unit 5, and data sink is public network signal receiving element 6.Public network signal transmitter unit 5 and public network signal receiving element 6 can pass through mobile public network (GSM network or GPRS network) and realize data transmission, the modulator-demodular unit of the preferred GSM network of public network signal receiving element 6 or GPRS network in the present embodiment, the communication module of the preferred GSM network of public network signal transmitter unit 5 or GPRS network.Described central monitoring device comprises background processor 40 and reservoir 41, the input end of described background processor 40 is connected to described data sink, the output terminal of described background processor 40 is connected to described mobile terminal 3 and above-mentioned reservoir 41, the input end of described background processor 40 is also connected with a ciphering unit 42, and the output terminal of described reservoir 41 is connected with a terminal display 43.The Enable Pin of described data sink is connected to the output terminal of described data sending device, the Enable Pin of described central monitoring device is connected to the output terminal of described data sink, and the output terminal of described central monitoring device connects the Enable Pin with described mobile terminal 3.By above-mentioned setting, maintenance personal can know the relevant information of direct current arrester Leakage Current in time with short message or other form by described central monitoring device, thus both avoided maintainer frequently to patrol surge arrester failure point at inclement weather, reduce the risk that maintenance personal gets an electric shock, reduce the time of recovering needed for line powering.
In the present embodiment, the cloud platform that one is collected the various Monitoring Data of various places UHVDC Arrester state can be built into, it comprises the Cloud Server (being described central monitoring device) by net connection substantially, cloud client (being described mobile terminal 3) and at least one measuring terminals (are the detecting instrument and equipment that are arranged at pick-up unit 1 in each electrical network on each UHVDC Arrester or other direct current arrester status informations, the function of these detecting instruments and equipment includes and can realize measuring lightning protection or telecommunications, electrically and the grounding resistance of the equipment such as electronics board, leakage current and harmonic wave, the change of electrostatic etc.).When this system is normally run, measuring terminals by net connection by data transfer to Cloud Server, cloud client obtains required measurement data from Cloud Server, user is inquired about measurement data by cloud client, display, export, utilize, the operations such as assessment, achieve that conventional measurement techniques cannot complete to the coordination of associated objects or the correlation measurement that are positioned at Different field, thus shorten Measuring Time, realize monitoring in real time multiple measuring terminals and remote measurement to measurand simultaneously, be conducive to scientific analysis and research thunder-strike phenomenon simultaneously.
With reference to Fig. 1.Described pick-up unit 1 comprises data acquisition unit 10, data processing unit 11, protection circuit unit 12, power supply unit 13 and a collection protection module 14.
The electric energy output end of described power supply unit 13 is divided into four tunnels, is electrically connected on the electrical energy inputs of protection circuit unit 12 respectively, gathers the electrical energy inputs of the electrical energy inputs of protection module 14, the electrical energy inputs of data acquisition unit 10 and data processing unit 11.Operationally, the output terminal of lightning arrester electric current is divided into two-way, one tunnel is connected to the Enable Pin of described data acquisition unit 10, another road is connected to the Enable Pin of described collection protection module 14, the output terminal of described collection protection module 14 is connected to the Enable Pin of described protection circuit unit 12, the Enable Pin of described data processing unit 11 is provided with two-way, one tunnel connects the output terminal of described data acquisition unit 10, another road connects the output terminal of described protection circuit unit 12, when lightning arrester electric current is less than or equal to 1 MAH, gather protection module 14 to be failure to actuate, and data acquisition unit 10 starts and through being exported by data processing unit 11 after carrying out signals collecting and data processing to electric current, when lightning arrester electric current is greater than 1 MAH, data acquisition unit 10 is motionless, and gathers protection module 14 and start, and described pick-up unit 1 presents high-impedance state to input, does not now carry out signals collecting and data processing, and exports via data processing unit 11.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.Described data acquisition unit 10 comprises current sensor 7, power amplifier 8, circuit acquisition module 9.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.Described current sensor 7 comprises an annular casing 70, the magnetic core 71 of one c-shaped layout and a precision electromagnetic sensor 72, an accommodation space 700 is provided with in described annular casing 70, described magnetic core 71 is arranged with respectively one first coil winding 710 and one second coil winding 711, and this magnetic core 71 is installed in described accommodation space 700, described precision electromagnetic sensor 72 is also installed in described the accommodation space 700 and two ends of its two ends and described magnetic core 71 and adjoins, the input end of described first coil winding 710 is electrically connected with lightning arrester leakance, the input end of described second coil winding 711 is electrically connected with an output terminal of described power amplifier 8, another output terminal of described power amplifier 8 is electrically connected with described circuit acquisition module 9, the magnetic flux density direction that described second coil winding 711 produces is contrary with the magnetic flux density direction of described first coil winding 710.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The diskette 720 that described precision electromagnetic sensor 72 comprises a curved layout is connected to the data contacts 721 on this diskette 720, described power amplifier 8 comprises an operational amplifier 80 be electrically connected with described data contacts 721 output terminal, one first triode 81, one second triode 82 and an input power 83, the collector of described first triode 81 is electrically connected on the positive interface 830 of described input power 83, the collector of described second triode 82 is connected to the negative interface 831 of described input power 83, the output terminal of described power amplifier 8 is divided into two-way, one tunnel is connected to the base stage of described first triode 81, another road is connected to the base stage of described second triode, the amplifying stage of described first triode 81 is divided into two-way, one tunnel is connected to the input end of described second coil winding 711, another road is connected to the amplifying stage of described second triode 82, described circuit acquisition module 9 comprises one end and is connected to the described measuring resistance R1 of the second coil winding 711 output terminal and the reometer A for measuring current values in this measuring resistance, the other end ground connection of described measuring resistance R1.The magnetic field produced in magnetic core 71 after the first coil winding 710 when the direct current signal of lightning arrester leakage current is aggregated on precision electromagnetic sensor, the voltage signal that precision electromagnetic sensor produces makes the second coil winding produces Contrary compensation electric current through power amplifier conducting effect, the magnetic flux that offset current produces is contrary with the flow direction that lightning arrester leakage current produces, after the two realizes magnetic balance, core flux is zero, in second coil winding, offset current is again after the test of oversampling circuit acquisition module, namely the direct current signal value of lightning arrester Leakage Current is drawn, thus the utility model is on the one hand adopt contactlessly to gather lightning arrester leakance, thus can ensure that collecting unit can carry out effectively and stably running in complex electromagnetic fields, not only voltage endurance capability is promoted greatly, and stronger self-recoverage and adaptive ability can be had under superpotential.The utility model can carry out online acquisition to the faint circuit signal of the microampere order of magnitude on the other hand, and the change of leakage current in direct current arrester, harmonic wave and electrostatic etc. is monitored at any time by central monitoring device, can effectively prevent lightning protection telecommunications or electrically and the equipment such as electronics board because of grounding resistance too high, the earthing effect of impact thunderbolt, effectively stop the damage and the injures and deaths that cause buildings and people and animals, and be conducive to the serviceable life extending lightning arrester.The present embodiment also utilizes diskette for core sensitive element is for the modular product of isolation detection electric current, its principle of work adopts magnetic balance type principle, namely when electric current flows through a long straight wire, magnetic field is produced around wire, the size in magnetic field is directly proportional to the size of current flowing through wire, this magnetic field can be assembled by soft magnetic material, then detect with diskette, because the change in magnetic field and the output voltage signal of diskette have good linear dependence, therefore the output signal that diskette records can be utilized, directly reflect the size of current in wire, and the advantage of diskette is its strong anti-interference ability, low temperature wafts and high sensitivity, particularly in the scope that electric current is-1A to 1A electric current, diskette presents good symmetry and sensitivity in magnetic flux density.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The insulation shell 702 that described annular casing 70 comprises a shield shell 701 and is arranged at outside this shield shell 701, described magnetic core 71 comprises two symmetrically arranged arc pellets 714 and a stationary pipes 715, two arc pellets 714 respectively abut mutually with one end, and overlapped by described stationary pipes 715 in the both sides of this abutted position, described arc pellet 714 is the arc pellet 714 that nano amorphous material is made, and described stationary pipes 715 is nano amorphous material stationary pipes 715.Current sensor is made up of nano amorphous material, diskette, nano amorphous material stationary pipes and screening can.Conveniently install, nano amorphous material is made HALF structure by us.After nano amorphous material installs, use stationary pipes to fix, with ensure sensor operationally this material can dock preferably.The utility model, when selecting magnetic material, has fully taken into account the problem of heavy current impact.So we select nano amorphous and amorphous soft magnet as the core material of current sensor.Amorphous soft magnet and nano amorphous material have good recovery capability, after the heavy current impact bearing moment, can well recover.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The two ends of described diskette 720 are respectively connected to one end of arc pellet 714 described in, volume occupied by described diskette 720 is 1/4th of described accommodation space 700 volume, volume occupied by described stationary pipes 715 is 1/4th of described accommodation space 700 volume, the volume occupied by part that the arc pellet 714 being arranged in described stationary pipes 715 side does not put stationary pipes 715 is 1/4th of described accommodation space 700 volume, the volume occupied by part that the arc pellet 714 being arranged in described stationary pipes 715 opposite side does not put stationary pipes 715 is 1/4th of described accommodation space 700 volume, described second coil winding 711 comprises the second coil around portion and lower second coil around portion, described upper second coil is set around the part that the arc pellet 714 being arranged in described stationary pipes 715 side does not put stationary pipes 715 around portion, described lower second coil is set around the part that the arc pellet 714 being arranged in described stationary pipes 715 opposite side does not put stationary pipes 715 around portion, described upper second coil is electrically connected to each other around portion around portion and lower second coil, described first coil winding 710 is set around the outside of described stationary pipes 715.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The extraction wire of described lightning arrester electric current adds inert-gas diode and TVS diode, this TVS diode differential concatenation ground connection.The present embodiment at all lead-in conductors, draw wire and other parts be necessary and all can select to install inert-gas diode additional and TVS diode prevents big current from destroying Circuits System.Because TVS diode is fast for start-up time, but discharge sustain ability is poor; And the start-up time of inert-gas diode is slow, discharge sustain ability is strong.Can be good at solving circuit protection problem so both use simultaneously.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.Described diskette 720 and/or magnetic core 71 are loaded with AC signal.By load AC signal on diskette after, the magnetic flux density of diskette and oppositely will magnetize back and forth and demagnetize at forward, can interrupt the magnetic polarization process of external electromagnetic field to magnetic material in this process.So the magnetic polarization of magnetic material can well be avoided.Be conducive to improving accuracy of detection of the present utility model and serviceable life.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.On the ground wire 16 that described annular casing 70 is set in lightning arrester and it comprises a left side half housing 705 and right half housing 706 that can mutually dismantle.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The magnetic field produced in magnetic core after the first coil winding when the direct current signal of lightning arrester leakage current is aggregated on diskette, diskette will produce voltage after sensing this part magnetic flux density, the voltage signal that diskette produces has carried out the control of discharge to input power through the amplification of operational amplifier, the positive interface of input power is made to export Contrary compensation electric current in the second coil winding, the magnetic flux that offset current produces is contrary with the flow direction that lightning arrester leakage current produces, by the control of operational amplifier to Contrary compensation electric current, the magnetic flux density in magnetic core is made to be always definite value, now in the second coil winding, offset current is input to ground again after measuring resistance R1, by reometer to the current values circulated in measuring resistance R1, and carry out according to this current values the direct current signal value that namely scale operation draws lightning arrester Leakage Current, above testing process not only circuit structure is simple, preparation cost is low, and detection accuracy is high, input precision can be ensured.
In addition, because the electromagnetic field of complexity is except causing the impact of magnetic polarization to magnetic material, the steady operation of electronic circuit may also be affected.So the utility model also can from wire laying mode, structural design and shell process aspect realize electromagnetic isolation, the functions such as decoupling filtering, thus enable system long-time steady operation.By arranging shield shell and insulation shell, be conducive to the magnetic flux leakage decreasing magnetic core, corresponding raising measuring accuracy, simultaneously also can the interference of effective shield perimeter electromagnetic field, minimizing measuring error.
With reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.The online method for detecting of the UHVDC Arrester Leakage Current that the present embodiment is corresponding, comprises the following steps:
A, judge whether to carry out signals collecting to electric current, when lightning arrester electric current is higher than the threshold value preset, TVS diode can start rapidly and carry out release current, and inert-gas diode starts afterwards, sustained release electric current.
B, signals collecting is carried out to electric current, the magnetic field produced in magnetic core 71 after the first coil winding 710 when the direct current signal of lightning arrester leakage current is aggregated on precision electromagnetic sensor 72, the voltage signal that precision electromagnetic sensor 72 produces makes the second coil winding 711 produces Contrary compensation electric current through power amplifier 8 conducting effect, the magnetic flux that offset current produces is contrary with the flow direction that lightning arrester leakage current produces, after the two realizes magnetic balance, magnetic core 71 magnetic flux is zero, in second coil winding 711, offset current is again after the test of oversampling circuit acquisition module 9, namely draw the direct current signal value of lightning arrester Leakage Current thus enter next step.More specifically, the magnetic field produced in magnetic core 71 after the first coil winding 710 when the direct current signal of lightning arrester leakage current is aggregated on diskette 720, diskette 720 will produce voltage after sensing this part magnetic flux density, the voltage signal that diskette 720 produces has carried out the control of discharge to input power 83 through the amplification of operational amplifier 80, the positive interface 830 of input power 83 is made to export Contrary compensation electric current in the second coil winding 711, the magnetic flux that offset current produces is contrary with the flow direction that lightning arrester leakage current produces, by the control of operational amplifier 80 pairs of Contrary compensation electric currents, the magnetic flux density in magnetic core 71 is made to be always definite value, now in the second coil winding 711, offset current is input to ground again after measuring resistance R1, by reometer A to the current values circulated in measuring resistance R1, and carry out according to this current values the direct current signal value that namely scale operation draws lightning arrester Leakage Current, thus enter next step.
C, the signal of collection carried out process rear formation current value data and export.
D, the current data of acquisition to be gathered by being wirelessly transmitted in central monitoring device, the coding of the direct current signal value containing lightning arrester Leakage Current, Measuring Time or lightning arrester installation site information, after data operation process, is sent to public network signal receiving element 6 with short message form by public network signal transmitter unit 5 by data processing unit 11.
E, central monitoring device show this current data and the distribution of this current data are sent to the gerentocratic mobile terminal 3 of corresponding lightning arrester simultaneously, be specially after background processor 40 receives the short message of coding form, the information of carrying out conversion, coded message is converted to Chinese information to be sent on the mobile terminal 3 of related management personnel or maintenance personal, and in reservoir 41 the above-mentioned information of persistence.
In addition, run through whole on-line checkingi process, all have and be loaded with AC signal on described diskette 720 and/or magnetic core 71, after diskette 720 and/or magnetic core 71 load AC signal, the magnetic flux density of diskette 720 and/or magnetic core 71 and oppositely will magnetize back and forth and demagnetize at forward, can interrupt the magnetic polarization process of external electromagnetic field to magnetic material in this process.
With reference to Fig. 5.Cleaning Principle of the present utility model specifically comprises: electric current I 1 and I2 produce the contrary magnetic flux density of B1 and B2 both direction respectively on two windings, and these two magnetic flux densities cancel each other at precision electromagnetic sensing station.Then the magnetic field collected according to precision electromagnetic sensor regulates the size of I2, makes B1+B2 be definite value.The stool and urine of then measuring I2 can know the size of I1.The core of part of data acquisition is precision electromagnetic sensor.The applicant is through research, and magnetic field acquisition method can be use hall device, but hall device nonlinear degree is comparatively large, antijamming capability is extremely weak, low to small-signal sensitivity, so cannot use in this UHVDC Arrester equipment.Therefore, in the present embodiment, magnetic field collector uses special soft magnetic material, and the advantage of soft magnetic material is that its strong anti-interference ability, low temperature waft and high sensitivity.
With reference to Fig. 6.As seen from Figure 6, diskette is in the scope of-1A to 1A electric current at electric current, presents good symmetry and sensitivity in magnetic flux density.
With reference to Fig. 7.Fig. 7 is the temperature drift curve of soft magnetic material and Hall element.We can find out that soft magnetic material temperature drift-40 degrees Celsius to 100 degrees Celsius time is very little in the figure 7, and this illustrates that soft magnetic material can work under comparatively rugged environment.In the temperature range of-40 degrees Celsius to 100 degrees Celsius, when utilizing soft magnetic material to make current acquisition device, error will be less than 2%.
With reference to Fig. 8.Fig. 8 is the situation loading AC signal to diskette.Can find out, after diskette loads AC signal, the magnetic flux density of diskette and oppositely will magnetize back and forth and demagnetize at forward, can interrupt the magnetic polarization process of external electromagnetic field to magnetic material in this process.So the magnetic polarization of magnetic material can well be avoided.
In addition, the soft magnetic material used in the present embodiment test is the NS358 material provided by former Shanghai Steel and Iron Research Institute, but repeatedly tests through the applicant, and the diskette that the soft magnetic material of other types obtains also can complete this object of applying for.And nano amorphous material is provided by magnetisable material and device key lab of the Chinese Academy of Sciences.Repeatedly test through the applicant equally, the magnetic core that the nano amorphous material of other types obtains also can complete this object of applying for.
Embodiment two
The present embodiment is substantially identical with the embodiment of embodiment one, its difference is: described data sending device comprises emission of radio frequency signals unit 50, frequency modulation retransmission unit 51 and dual mode communication unit 52 in connecting successively, and described data sink is the public network signal receiving element 6 be connected with the output terminal of this dual mode communication unit 52.
Adopt above-mentioned arrange can make the present embodiment both can in the scope having public network to cover by electric circuit inspection data transfer to central monitoring device, also can coordinating by described emission of radio frequency signals unit and frequency modulation retransmission unit in the region not having public network signal, first lightning strike information is dealt into the dual mode communication unit be arranged in public network coverage, be transferred to central monitoring device more afterwards, can greatly widen applicable situation of the present utility model like this, make to be located at direct current arrester in some remote mountains or thick forest and also can detect the information of its Leakage Current by real-time online.
The present embodiment is coordinated by emission of radio frequency signals unit and frequency modulation retransmission unit, propagation distance frequency farthest in frequency range can be automatically selected to launch the current data collected, the defect that single frequency propagation distance is too short can be overcome, make applicable situation of the present utility model broader.
In addition, because the present embodiment is distinguished to some extent for data sending device and embodiment one, thus the online method for detecting of the present embodiment to UHVDC Arrester leakage circuit is also different, and its difference is:
On the one hand, steps d comprises data processing unit after data operation process, by the cooperation of the coding of the direct current signal value containing lightning arrester Leakage Current, Measuring Time or lightning arrester installation site information by emission of radio frequency signals unit and frequency modulation retransmission unit, when ensureing communication channel unimpeded, in the mode of private network automatic frequency-hopping, coded message is forwarded on the bimodulus communication unit of mobile public network signal coverage areas through one-level, and then is sent to public network signal receiving element by bimodulus communication unit with short message form.
On the other hand, step e comprises after background processor receives the short message of coding form, the information of carrying out conversion, converts Chinese information to and is sent on the mobile terminal of related management personnel or maintenance personal by coded message, and in reservoir the above-mentioned information of persistence.
Above are only embodiment of the present utility model, but design concept of the present utility model is not limited thereto, all changes utilizing this design the utility model to be carried out to unsubstantiality, all should belong to the behavior of invading the utility model protection domain.
Claims (10)
1. with the pick-up unit of non-contact sensor to UHVDC Arrester Leakage Current, it is characterized in that: comprise data acquisition unit, data processing unit, protection circuit unit and power supply unit, described data acquisition unit comprises current sensor, power amplifier and circuit acquisition module, described current sensor comprises an annular casing, the magnetic core of one c-shaped layout and a precision electromagnetic sensor, an accommodation space is provided with in described annular casing, described magnetic core is arranged with respectively one first coil winding and one second coil winding, and this magnetic core is installed in described accommodation space, described precision electromagnetic sensor is also installed in described accommodation space and the two ends of its two ends and described magnetic core and adjoins, the input end of described first coil winding is electrically connected with lightning arrester leakance, the input end of described second coil winding is electrically connected with an output terminal of described power amplifier, another output terminal of described power amplifier is electrically connected with described circuit acquisition module, the magnetic flux density direction that described second coil winding produces is contrary with the magnetic flux density direction of described first coil winding.
2. as claimed in claim 1 with the pick-up unit of non-contact sensor to UHVDC Arrester Leakage Current, it is characterized in that: the diskette that described precision electromagnetic sensor comprises a curved layout is connected to the data contacts on this diskette, described power amplifier comprises an operational amplifier be electrically connected with described data contacts output terminal, one first triode, one second triode and an input power, the collector of described first triode is electrically connected on the positive interface of described input power, the collector of described second triode is connected to the negative interface of described input power, the output terminal of described power amplifier is divided into two-way, one tunnel is connected to the base stage of described first triode, another road is connected to the base stage of described second triode, the amplifying stage of described first triode is divided into two-way, one tunnel is connected to the input end of described second coil winding, another road is connected to the amplifying stage of described second triode, described circuit acquisition module comprises one end and is connected to the described measuring resistance R1 of the second coil winding output terminal and the reometer for measuring current values in this measuring resistance, the other end ground connection of described measuring resistance R1.
3. as claimed in claim 2 with the pick-up unit of non-contact sensor to UHVDC Arrester Leakage Current, it is characterized in that: the insulation shell that described annular casing comprises a shield shell and is arranged at outside this shield shell, described magnetic core comprises two symmetrically arranged arc pellets and a stationary pipes, two arc pellets respectively abut mutually with one end, and described stationary pipes on the cover of the both sides of this abutted position, described arc pellet is the arc pellet that nano amorphous material is made, and described stationary pipes is nano amorphous material stationary pipes.
4. as claimed in claim 2 with the pick-up unit of non-contact sensor to UHVDC Arrester Leakage Current, it is characterized in that: the insulation shell that described annular casing comprises a shield shell and is arranged at outside this shield shell, described magnetic core comprises two symmetrically arranged arc pellets and a stationary pipes, two arc pellets respectively abut mutually with one end, and described stationary pipes on the cover of the both sides of this abutted position, described arc pellet is the arc pellet that amorphous soft magnetic material is made, and described stationary pipes is amorphous soft magnet stationary pipes.
5. as described in claim 3 or 4 with the pick-up unit of non-contact sensor to UHVDC Arrester Leakage Current, it is characterized in that: the two ends of described diskette are respectively connected to one end of arc pellet described in, volume occupied by described diskette is 1/4th of described accommodation space volume, volume occupied by described stationary pipes is 1/4th of described accommodation space volume, the volume occupied by part that the arc pellet being arranged in described stationary pipes side does not put stationary pipes is 1/4th of described accommodation space volume, the volume occupied by part that the arc pellet being arranged in described stationary pipes opposite side does not put stationary pipes is 1/4th of described accommodation space volume, described second coil winding comprises the second coil around portion and lower second coil around portion, described upper second coil is set around the part that the arc pellet being arranged in described stationary pipes side does not put stationary pipes around portion, described lower second coil is set around the part that the arc pellet being arranged in described stationary pipes opposite side does not put stationary pipes around portion, described upper second coil is electrically connected to each other around portion around portion and lower second coil, described first coil winding is set around the outside of described stationary pipes.
6. as claimed in claim 5 with the pick-up unit of non-contact sensor to UHVDC Arrester Leakage Current, it is characterized in that: described pick-up unit also comprises a collection protection module, the electric energy output end of described power supply unit is divided into four tunnels, be electrically connected on the electrical energy inputs of protection circuit unit respectively, gather the electrical energy inputs of protection module, the electrical energy inputs of data acquisition unit and the electrical energy inputs of data processing unit, the output terminal of lightning arrester electric current is divided into two-way, one tunnel is connected to the Enable Pin of described data acquisition unit, another road is connected to the Enable Pin of described collection protection module, the output terminal of described collection protection module is connected to the Enable Pin of described protection circuit unit, the Enable Pin of described data processing unit is provided with two-way, one tunnel connects the output terminal of described data acquisition unit, another road connects the output terminal of described protection circuit unit, when lightning arrester electric current is less than or equal to 1 MAH, collection protection module is failure to actuate, and data acquisition unit starts and through being exported by data processing unit after carrying out signals collecting and data processing to electric current, when lightning arrester electric current is greater than 1 MAH, data acquisition unit is motionless, and gathers protection module startup, and described pick-up unit presents high-impedance state to input, does not now carry out signals collecting and data processing, and exports via data processing unit.
7. as claimed in claim 6 with the pick-up unit of non-contact sensor to UHVDC Arrester Leakage Current, it is characterized in that: the extraction wire of described lightning arrester electric current adds inert-gas diode and TVS diode, this TVS diode differential concatenation ground connection.
8., as claimed in claim 7 with the pick-up unit of non-contact sensor to UHVDC Arrester Leakage Current, it is characterized in that: described diskette and/or magnetic core are loaded with AC signal.
9. as claimed in claim 8 with the pick-up unit of non-contact sensor to UHVDC Arrester Leakage Current, it is characterized in that: on the ground wire that described annular casing is set in lightning arrester and it comprises a left side half housing and right half housing that can mutually dismantle.
10. as claimed in claim 9 with the pick-up unit of non-contact sensor to UHVDC Arrester Leakage Current, it is characterized in that: the input end of described first coil winding adds inert-gas diode and TVS diode, this TVS diode differential concatenation ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520740922.6U CN205103296U (en) | 2015-09-23 | 2015-09-23 | Detection apparatus for reveal electric current with non - contact pick up to special high voltage direct current arrester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520740922.6U CN205103296U (en) | 2015-09-23 | 2015-09-23 | Detection apparatus for reveal electric current with non - contact pick up to special high voltage direct current arrester |
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| CN205103296U true CN205103296U (en) | 2016-03-23 |
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| CN201520740922.6U Expired - Fee Related CN205103296U (en) | 2015-09-23 | 2015-09-23 | Detection apparatus for reveal electric current with non - contact pick up to special high voltage direct current arrester |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182043A (en) * | 2015-09-23 | 2015-12-23 | 厦门红相电力设备股份有限公司 | Ultrahigh voltage DC arrester leakage current detection device through noncontact sensor |
| CN106025993A (en) * | 2016-07-06 | 2016-10-12 | 常德威迪电气有限责任公司 | Falling type lightning arrester |
| CN109975595A (en) * | 2019-04-08 | 2019-07-05 | 山东大学 | A kind of leakage current sensor and device of anti-power frequency magnetic field interference |
-
2015
- 2015-09-23 CN CN201520740922.6U patent/CN205103296U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182043A (en) * | 2015-09-23 | 2015-12-23 | 厦门红相电力设备股份有限公司 | Ultrahigh voltage DC arrester leakage current detection device through noncontact sensor |
| CN105182043B (en) * | 2015-09-23 | 2018-05-11 | 红相股份有限公司 | Detection device with non-contact sensor to UHVDC Arrester leakage current |
| CN106025993A (en) * | 2016-07-06 | 2016-10-12 | 常德威迪电气有限责任公司 | Falling type lightning arrester |
| CN109975595A (en) * | 2019-04-08 | 2019-07-05 | 山东大学 | A kind of leakage current sensor and device of anti-power frequency magnetic field interference |
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