CN105223457A - The device and method that extra-high voltage reactor earth fault judges and processes, eliminates - Google Patents
The device and method that extra-high voltage reactor earth fault judges and processes, eliminates Download PDFInfo
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Abstract
The present invention proposes the device that a kind of extra-high voltage reactor earth fault judges and processes, eliminates, it comprises ground outlet supporting insulator, include two groups of current transformers of first, second, and third current transformer, the electric unit be made up of the thyristor of the restriction impedance unit of parallel connection, Failure elimination device and reverse parallel connection, AD conversion interface circuit, and single-chip microcomputer; The ground outlet of described folder and iron core, through the coil of the first current transformer, is then passed through the parallel circuit be made up of the thyristor of restriction impedance unit, Failure elimination device and two reverse parallel connections, is arrived earth terminal.The device that the present invention proposes, the working strength of operations staff can be significantly reduced, the situation of change of folder, iron core grounding current value just can be monitored in real time online on monitoring backstage, monitoring accuracy is high, Failure elimination can be carried out in time, avoid the further expansion of extra-high voltage reactor fault coverage, ensure the safe and stable operation of electrical network.
Description
Technical field
The invention belongs to electrical equipment field, be specifically related to the device of a kind of monitoring and elimination reactor ground current.
Background technology
Shunt reactor is indispensable visual plant in high voltage, telecommunicate power transmission network, be used for compensating the charging current on long line, slacken capacity effect, restriction system power-frequency voltage raises and switching overvoltage, the self-excitation phenomenon produced when eliminating the long line of synchronous generator band zero load.The charge power of UHV transmission line is large, and with regard to unit length transmission line of electricity, its charge power is about 4 ~ 5 times of 500kV transmission line of electricity, needs extra-high voltage reactor in parallel to carry out reactive-load compensation.Extra-high voltage reactor adopts single-phase liquid immersed reactor usually, and iron core and winding are immersed in insulating oil, and reactor rated voltage 1000kV is even higher.
When reactor runs, its iron core and folder must carry out effectively reliably ground connection, otherwise folder, iron core can produce floating potential by the coupling of electric capacity, when the potential difference (PD) of miscellaneous part in floating potential and reactor adds up to reach certain value, insulation therebetween can be punctured, and produce spark discharge, also can by reactor scaling loss time serious.When extra-high voltage reactor folder, iron core generation multipoint earthing, can make folder, iron core respectively and between ground, form closed path loop, the loop resistance formed due to folder, iron core is little, much bigger when induced potential effect lower core and the normal operation of clamp earthing current ratio, even can reach hundreds of amperes time maximum, so large ground current is enough to the damage causing reactor.
Due to iron core grounding fault and other abnormal conditions, in insulating oil, multiple gases can be produced.The usual detection means of power department detects the failure gas be dissolved in insulating oil, and to the insulating oil of equipment sample laggard row gas chromatographic analysis and with clamp on amperemeter survey draw the ground connection of grounding sleeve outside core of reactor under the electric current that goes between, thus know ground fault condition.The reactor iron core grounding current intelligent online monitoring device that invention CN202119823U proposes, to comprise with micro crystal material be the current sensor of magnetic core, signal amplifies conditioning device and computer monitoring display terminal, current sensor adopts the method for cast epoxy to be enclosed in housing, for Real-Time Monitoring display iron core grounding current.If there is fault, need power failure then to carry out series resistor and process with other modes, the normal safe operation that processing mode has badly influenced extra-high voltage grid is carried out in this power failure.
Summary of the invention
For the technical matters that this area exists, the object of the invention is the device proposing the judgement of a kind of extra-high voltage reactor earth fault and process, eliminate.
Another object of the present invention is the method proposing the judgement of a kind of extra-high voltage reactor earth fault and process, eliminate.
The technical scheme realizing the object of the invention is:
A kind of extra-high voltage reactor iron core and clamp earthing current monitoring, control and cancellation element, described reactor comprises reactor oil tank, core of reactor, is positioned at the folder at core of reactor two ends, described folder and iron core are all connected with ground outlet, described ground outlet, through extension line sleeve pipe, extends to the earth terminal on ground outside reactor oil tank;
Described monitoring, control and cancellation element comprise: two ground outlet supporting insulators, include two groups of current transformers of first, second, and third current transformer, by two groups of electric units of the thyristor composition of the restriction impedance unit of parallel connection, Failure elimination device and two reverse parallel connections, AD conversion interface circuit, and single-chip microcomputer;
The ground outlet supporting insulator of folder is fixedly installed outside the casing of reactor oil tank, the ground outlet supporting insulator of described folder is fixedly installed the first current transformer of folder, the second current transformer and the 3rd current transformer, the primary winding of the first current transformer is passed in the ground outlet of described folder, then the parallel circuit by being made up of the thyristor of restriction impedance unit, Failure elimination device and two reverse parallel connections, arrives earth terminal;
Cored ground outlet supporting insulator is fixedly installed outside the casing of reactor oil tank, the ground outlet supporting insulator of described iron core is fixedly installed the first cored current transformer, the second current transformer and the 3rd current transformer, the primary winding of the first current transformer is passed in the ground outlet of described iron core, then by the thyristor of restriction impedance unit in parallel, Failure elimination device and two reverse parallel connections processed, then earth terminal is arrived;
Described iron core and the two ends of secondary coil of the first current transformer of folder, the second current transformer and the 3rd current transformer be connected to 12 input ends of described AD conversion interface circuit, the output terminal of described AD conversion interface circuit connects described single-chip microcomputer;
The control end of two thyristors in parallel with restriction impedance unit, Failure elimination device described in described single-chip microcomputer connects.
Wherein, the first described current transformer, the second current transformer and the 3rd current transformer are connected in parallel.
Preferably, described restriction impedance unit comprises winding and insulating cylinder, and described winding is wrapped on insulating cylinder, winding is connected with 5 taps, each point connects the switches set being provided with and being made up of two reverse parallel connection thyristors, and the all-in resistance of described winding is 1000 Ω.
More preferably, described winding switching has 5 taps, and be respectively a tap, two taps, three taps, four taps and five taps, the number of turn between each tap is not identical, and the turn ratio of tap is 10:40:100:400:1000.
Wherein, described Failure elimination device is made up of the thyristor of transformer, two reverse parallel connections and pulsed capacitance, and described transformer is connected with thyristor parallel branch, the branch circuit parallel connection of pulsed capacitance and transformer and Thyristors in series.
Preferably, described step down side voltage is 220V, and high side voltage is 1000V.
Preferably, described single-chip microcomputer is also connected with display unit, multipoint earth faults electric current record cell, multipoint earthing alarm and backstage and monitors computer.
A kind of monitoring of high-power transformer multipoint earthing, control and removing method, ground current (Ir+Ig) and the interference current Ig of iron core extension line is monitored respectively with three current transformers, the difference Ir of calculating current mutual inductor data, as Ir > 0.1A, be then the resistance of 10-1000 Ω to iron core extension line access resistance, access capacity is the pulsed capacitance of 2 μ F simultaneously, discharges to iron core extension line.
Similarly, ground current (Ir+Ig) and the interference current Ig of folder extension line is monitored respectively with three current transformers, the difference Ir of calculating current mutual inductor data, as Ir > 0.1A, be then the resistance of 10-1000 Ω to folder extension line access resistance, access capacity is the pulsed capacitance of 2 μ F simultaneously, discharges to folder extension line.
Preferably, the resistance accessed to iron core and/or folder extension line by switches set step control, if Ir≤0.1A during access resistance 10 Ω, then keeps access one point of connecting resistance; If Ir is > 0.1A still, then access two points of connecting resistances of resistance 40 Ω, disconnect a tap simultaneously, if now Ir≤0.1A, then keep two points of connecting resistances of access 40 Ω; If Ir is > 0.1A still, then access three points of connecting resistances of resistance 100 Ω, disconnect two points of connecting resistances simultaneously, if now Ir≤0.1A, then keep the resistance of three taps accesses; If Ir is > 0.1A still, then access four points of connecting resistances of resistance 400 Ω, disconnect three taps simultaneously, if now Ir≤0.1A, then keep the resistance of four taps accesses; If Ir is > 0.1A still, then access five points of connecting resistances of resistance 1000 Ω.
Beneficial effect of the present invention is:
The device that the present invention proposes, electric current is gathered respectively by three current transformers, a current transformer is enclosed within folder or iron core grounding lead-in wire respectively, the electric current surveyed is except folder or iron core grounding current Ir, also has the interference current Ig that the other factorses such as leakage field produce, another two for detecting the current transformer of interference current, ask the mean value of its Monitoring Data to be interference current Ig.Folder or iron core grounding current are respectively the difference between currents of (Ir+Ig) and interference current Ig.This process eliminate the interference of leakage field, solve the problem that extra-high voltage reactor Site Detection data are bigger than normal, improve the accuracy of test.
The device that the present invention proposes, the working strength of operations staff can be significantly reduced, the situation of change of folder, iron core grounding current value just can be monitored in real time online on monitoring backstage, monitoring accuracy is high, Failure elimination can be carried out in time, avoid the further expansion of extra-high voltage reactor fault coverage, ensure the safe and stable operation of electrical network.
Accompanying drawing explanation
Fig. 1 is extra-high voltage reactor inner structure schematic diagram.
Fig. 2 is extra-high voltage reactor iron core of the present invention and clamp earthing current monitoring, controls and the layout schematic diagram of cancellation element.
Fig. 3 is the circuit diagram of restriction impedance unit.
Fig. 4 is the circuit diagram of Failure elimination device.
In figure, 1 is extra-high voltage reactor fuel tank, 2 is core of reactor, 3 is lower clamping piece, 4 is upper clamping piece, 5 is soft wiring, 6 is arm-tie, 7 is iron core grounding sheet, 8 is folder small casing, 9 is iron core small casing, 10 is folder extension line, 11 is iron core extension line, 12 is earth terminal, 13 is the second current transformer of folder, 14 is the first current transformer of folder, 15 is the 3rd current transformer of folder, 16 is the supporting insulator of folder, 17 is the second current transformer of iron core, 18 is the first current transformer of iron core, 19 is the 3rd current transformer of iron core, 20 is the supporting insulator of iron core extension line, 21 is single-chip microcomputer, 22 is AD conversion interface circuit, 23 is LCD display, 24 is multipoint earth faults electric current record cell, 25 is multipoint earthing alarm, 26 is background monitoring computer, 27 is iron core restriction impedance unit, 28 is iron core Failure elimination device, 29 is folder restriction impedance unit, 30 is folder Failure elimination device, 31, 32, 33, 34, 43, 44, 45, 4648, 49, 52, 57, 53, 54, 55, 56 is that (every two is one group of reverse parallel connection to thyristor, each component belongs to different circuit) 35 for insulating cylinder, 36 is left socle, and 37 is right support, and 38 is winding one tap, 39 is winding two tap, 40 is winding three tap, and 41 is winding four tap, and 42 is winding five tap, 47 is transformer, and 50 is pulsed capacitance.
Embodiment
Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
In describing the invention, term " " center ", " transverse direction ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
Embodiment 1
See Fig. 1, Fig. 2, two mutual inductors of high-capacity reactor floating potential are monitored, are controlled and a cancellation element, and this high-capacity reactor is oil-immersed electric reactor, rated voltage 1000kV, comprise extra-high voltage reactor fuel tank 1, in fuel tank, have core of reactor 2, folder and winding.The two ends of core of reactor 2 are respectively arranged with reactor upper clamping piece 4 and reactor lower clamping piece 3, and reactor upper clamping piece 4 is connected by arm-tie 6 with reactor lower clamping piece 3, and arm-tie 6 is connected by soft wiring 5 with reactor lower clamping piece 3.Iron core extension line 11 is drawn by ground lug 7, iron core small casing 9, and folder ground connection is drawn by folder ground outlet 10, folder small casing 8.
Outside the casing of reactor oil tank 1, be fixedly installed iron core grounding extension line supporting insulator 20, folder ground outlet supporting insulator 16, the first current transformer 14, second current transformer 13 of folder, the 3rd current transformer 15 are fixed on folder ground outlet supporting insulator 15; Equally, be fixed on the supporting insulator 20 of iron core at first, second, third current transformer 17,18,19 of iron core extraction on-line monitoring iron core grounding current;
Folder ground outlet 10 is by after folder small casing 8, through the primary winding of the first current transformer 14 of folder, then connect the electric unit be made up of the thyristor 31,32 of the folder restriction impedance unit 29 of parallel connection, multipoint earthing of clamping piece elimination unit 30 and two reverse parallel connections, arrive earth terminal 12.The secondary coil two ends of the first current transformer 14 are connected with two input interfaces of AD conversion interface circuit 22 respectively, the two ends of the secondary side inductive coil of the second current transformer 13 are connected with another two input interfaces of AD conversion interface circuit 22 respectively, the two ends of the secondary side inductive coil of the 3rd current transformer 15 are connected with another two input interfaces of AD conversion interface circuit 22 (having connect AD conversion interface circuit 6 interfaces altogether), and the output terminal of AD conversion interface circuit 22 is connected with single-chip microcomputer 21.
Similar, iron core extension line 11 through after iron core small casing 9 after being fixed on three current transformers on iron core grounding extension line supporting insulator 20 (the first current transformer 18, second current transformer 17 of iron core, the 3rd current transformer 19), iron core restriction impedance unit 27 and multipoint earthing of iron core and eliminating unit 28 ground connection.Iron core grounding extension line 11 passes from the primary winding of the first current transformer 18, then impedance unit 27 is limited with iron core, the thyristor 33 of iron core Failure elimination device 28 and two reverse parallel connections is connected with the input end of 34, wherein iron core restriction impedance circuit 27, iron core Failure elimination device 28, the thyristor 29 and 30 of two reverse parallel connections is parallel relationship, the two ends of the secondary side inductive coil of the first current transformer 18 of iron core, the two ends of the secondary side inductive coil of the second current transformer 17, the two ends of the secondary side inductive coil of the 3rd current transformer 19, be connected with the input interface of AD conversion interface circuit 22 all separately (having connect 6 input interfaces altogether), the output terminal of AD conversion interface circuit 22 is connected with single-chip microcomputer 21.
Wherein, the restriction impedance unit 27 of iron core is the same with the electrical structure of the restriction impedance unit 29 of folder, includes winding and insulating cylinder, and winding is wrapped on insulating cylinder, winding is connected with 5 taps, each point connects the switches set being provided with and being made up of two reverse parallel connection thyristors.The resistance of winding is 1000 Ω.See Fig. 3.The restriction impedance unit of iron core or folder comprises: left socle 36, right support 37, insulating cylinder 35, winding one tap 38, winding two tap 39, winding three tap 40, winding four tap 41, winding five tap 42, and the thyristor 43,44 of two parallel connected in reverse phase of controlled winding one tap 38, the thyristor 45 of two parallel connected in reverse phase of winding two tap 39,46, the thyristor 52,57 of two parallel connected in reverse phase of winding three tap 40, the thyristor 53 of two parallel connected in reverse phase of winding four tap 41,54, the thyristor 55,56 of two parallel connected in reverse phase of winding five tap 42.The turn ratio of tap is 10:40:100:400:1000.
The electrical structure of folder Failure elimination device 30, iron core Failure elimination device 28 is the same, is all made up of (Fig. 4) the thyristor 48 and thyristor 49, transformer 47 and pulsed capacitance 50 that play on-off action.Transformer, pulsed capacitance are connected with thyristor parallel branch.The parameter of transformer 47 is low-pressure side voltage 220V, high side voltage 1000V.The capacity of pulsed capacitance is 2 μ F.
Single-chip microcomputer 21 is also connected with the LCD display 23, multipoint earth faults electric current record cell 24, multipoint earthing alarm 25 and the background monitoring computer 26 that show electric current.
Embodiment 2
The device of Application Example 1, earth fault judge and process, eliminate method as follows:
When single-chip microcomputer 21 accept the input signal of the secondary side inductive coil of the first current transformer, the second current transformer, the 3rd current transformer secondary side inductive coil signal after, as calculated, if record folder or iron core grounding current is less than 0.1 ampere, then single-chip microcomputer controls the short circuiting switch group conducting ground connection of two Switched Thyristors compositions respectively, and now current-limiting impedance element and multipoint earth faults cancellation element do not work;
When single-chip microcomputer accepts input signal and second current transformer of the secondary side inductive coil of the first current transformer, after the signal of the secondary side inductive coil of the 3rd current transformer, as calculated, if record clamp earthing current to be greater than 0.1 ampere, then single-chip microcomputer 21 controls the short circuiting switch group cut-off that two Switched Thyristors (31 and 32) form, by the thyristor 48 of folder Failure elimination device 30, 49 control conducting, transformer 47 paired pulses electric capacity 50 charges, thyristor 48 is controlled after charging complete, 49 cut-offs, pulsed capacitance 50 is accessed folder extension line 10 and forms discharge loop, namely folder is discharged.After electric discharge in two kinds of situation, if the first situation records clamp earthing current be less than or equal to 0.1 ampere, then illustrate that multipoint earth faults is eliminated, short circuiting switch group 31, the 32 conducting ground connection of Single-chip Controlling two Switched Thyristors composition, now folder restriction impedance unit 29 and folder Failure elimination device 30 do not work.The second situation, if record clamp earthing current be still greater than 0.1 ampere, directly control the thyristor 43 of restriction impedance unit, 44 conductings, restriction impedance unit cut-in operation: first control thyristor 43, 44 conductings access the first tap 38, if iron core grounding current is also greater than 0.1 ampere, by controlling thyristor 43, 44 end and disconnect the first tap, control thyristor 45, 46 conductings access the second tap 39, if now iron core grounding current is still greater than 0.1 ampere, by controlling thyristor 45, 46 end and disconnect the second tap, by controlling thyristor 52, 57 conducting access the 3rd taps 40, if similar iron core grounding current is still greater than 0.1 ampere, disconnects the 3rd tap 40 and access the 4th tap 41 simultaneously, if iron core grounding current is also greater than 0.1 ampere, disconnect the 4th tap 41, until access the 5th tap 42.
Similarly, when single-chip microcomputer accepts input signal and second current transformer of the secondary side inductive coil of the first current transformer, after the signal of the secondary side inductive coil of the 3rd current transformer, as calculated, if record iron core grounding current to be greater than 0.1 ampere, then single-chip microcomputer 21 controls short circuiting switch group 33 and 34 cut-off of two Switched Thyristors compositions, by the thyristor 48 of iron core Failure elimination device 28, 49 control conducting, transformer 47 paired pulses electric capacity 50 charges, thyristor 48 is controlled after charging complete, 49 cut-offs, pulsed capacitance 50 is accessed iron core extension line 11 and forms discharge loop, namely iron core is discharged.After electric discharge in two kinds of situation, if the first situation records iron core grounding current be less than or equal to 0.1 ampere, then illustrate that multipoint earth faults is eliminated, short circuiting switch group 33, the 34 conducting ground connection of Single-chip Controlling two Switched Thyristors composition, this limit impedance unit 27 and iron core Failure elimination device 28 do not work.The second situation, if record iron core grounding current be still greater than 0.1 ampere, directly control the turn on thyristors of restriction impedance unit, restriction impedance unit cut-in operation: first control thyristor 43, 44 conductings access the first tap 38, if iron core grounding current is also greater than 0.1 ampere, by controlling thyristor 43, 44 end and disconnect the first tap, control thyristor 45, 46 conductings access the second tap 39, if now iron core grounding current is still greater than 0.1 ampere, by controlling thyristor 45, 46 end and disconnect the second tap, by controlling thyristor 52, 57 conducting access the 3rd taps 40, if similar iron core grounding current is still greater than 0.1 ampere, disconnects the 3rd tap 40 and access the 4th tap 41 simultaneously, if iron core grounding current is also greater than 0.1 ampere, disconnect the 4th tap 41, until access the 5th tap 42.
The present invention gathers electric current by the present invention respectively by three current transformers, a current transformer is enclosed within folder or iron core grounding lead-in wire respectively, the electric current surveyed is except folder or iron core grounding current Ir, also has the interference current Ig that the other factorses such as leakage field produce, another two for detecting the current transformer of interference current, ask its mean value to be interference current Ig.Folder or iron core grounding current are respectively (Ir+Ig) of folder or iron core and the difference between currents of interference current Ig.This process eliminate the interference of leakage field, solve the problem that extra-high voltage reactor Site Detection data are bigger than normal, improve the accuracy of test.
When reactor normally runs, as the thyristor short circuit that Limited Current impedance unit, Failure elimination device are all switched on.When folder or iron core generation multipoint earthing, drop into Failure elimination device, restriction impedance unit.Current-limiting impedance element adopts resistance to add the mode of reactance, solves the high and problem of Limited Current weak effect of current-limiting resistance capacity requirement.When folder or iron core generation multipoint earthing, drop into multipoint earthing cancellation element, Limited Current impedance unit.Current-limiting impedance element uses the winding of band 5 taps when folder or iron core generation multipoint earthing, and often loop current frequency is higher, drops into tap winding and is equivalent to be connected in series resistance and inductance in the loop, the especially inductance of winding.
The method of tradition termination adopts switch, because sparking appears in the frequent break-make of switch band electric current, had a strong impact on the serviceable life of switch.And adopting thyristor control, cost performance is high, and afterflow ability is strong, does not occur sparking, and serviceable life is unaffected, solves the problem in Traditional control switch serviceable life.
Above embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various modification that the common engineering technical personnel in this area make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determine.
Claims (9)
1. an extra-high voltage reactor earth fault judge and process, the device eliminated, described reactor comprises reactor oil tank, core of reactor, is positioned at the folder at core of reactor two ends, described folder and iron core are all connected with ground outlet, described ground outlet, through extension line sleeve pipe, extends to the earth terminal on ground outside reactor oil tank;
It is characterized in that, described earth fault judges and process, the device eliminated comprise: two ground outlet supporting insulators, include two groups of current transformers of first, second, and third current transformer, by two groups of electric units of the thyristor composition of the restriction impedance unit of parallel connection, Failure elimination device and two reverse parallel connections, AD conversion interface circuit, and single-chip microcomputer;
The ground outlet supporting insulator of folder is fixedly installed outside the casing of reactor oil tank, the ground outlet supporting insulator of described folder is fixedly installed the first current transformer of folder, the second current transformer and the 3rd current transformer, the primary winding of the first current transformer is passed in the ground outlet of described folder, then the parallel circuit by being made up of the thyristor of restriction impedance unit, Failure elimination device and two reverse parallel connections, arrives earth terminal;
Cored ground outlet supporting insulator is fixedly installed outside the casing of reactor oil tank, the ground outlet supporting insulator of described iron core is fixedly installed the first cored current transformer, the second current transformer and the 3rd current transformer, the primary winding of the first current transformer is passed in the ground outlet of described iron core, then by the thyristor of restriction impedance unit in parallel, Failure elimination device and two reverse parallel connections processed, then earth terminal is arrived;
Described iron core and the two ends of secondary coil of the first current transformer of folder, the second current transformer and the 3rd current transformer be connected to 12 input ends of described AD conversion interface circuit, the output terminal of described AD conversion interface circuit connects described single-chip microcomputer;
The control end of described thyristor connects described single-chip microcomputer.
2. device according to claim 1, is characterized in that, the first described current transformer, the second current transformer and the 3rd current transformer are connected in parallel.
3. device according to claim 1, it is characterized in that, described restriction impedance unit comprises winding and insulating cylinder, described winding is wrapped on insulating cylinder, winding is connected with 5 taps, each point connects the switches set being provided with and being made up of two reverse parallel connection thyristors, and the all-in resistance of described winding is 1000 Ω.
4. device according to claim 3, it is characterized in that, described winding switching has 5 taps, is respectively a tap, two taps, three taps, four taps and five taps, the number of turn between each tap is not identical, and the turn ratio of tap is 10:40:100:400:1000.
5. device according to claim 1, it is characterized in that, described Failure elimination device is made up of the thyristor of transformer, two reverse parallel connections and pulsed capacitance, and described transformer is connected with the branch road of thyristor parallel connection, the branch circuit parallel connection of pulsed capacitance and transformer and Thyristors in series.
6. according to claim 4 pair of mutual inductor monitoring, control and cancellation element, it is characterized in that, described step down side voltage is 220V, and high side voltage is 1000V.
7., according to the arbitrary described device of claim 1-5, it is characterized in that, described single-chip microcomputer is also connected with display unit, multipoint earth faults electric current record cell, multipoint earthing alarm and backstage and monitors computer.
8. the monitoring of a high-power transformer multipoint earthing, control and removing method, it is characterized in that, ground current (Ir+Ig) and the interference current Ig of iron core extension line is monitored respectively with three current transformers, the difference Ir of calculating current mutual inductor data, as Ir > 0.1A, be then the resistance of 10-1000 Ω to iron core extension line access resistance, access capacity is the pulsed capacitance of 2 μ F simultaneously, discharges to iron core extension line.
Similarly, ground current (Ir+Ig) and the interference current Ig of folder extension line is monitored respectively with three current transformers, the difference Ir of calculating current mutual inductor data, as Ir > 0.1A, be then the resistance of 10-1000 Ω to folder extension line access resistance, access capacity is the pulsed capacitance of 2 μ F simultaneously, discharges to folder extension line.
9. monitoring according to claim 8, control and removing method, is characterized in that, the resistance accessed to iron core and/or folder extension line by switches set step control, if Ir≤0.1A during access resistance 10 Ω, then keeps access one point of connecting resistance; If Ir is > 0.1A still, then access two points of connecting resistances of resistance 40 Ω, disconnect a tap simultaneously, if now Ir≤0.1A, then keep two points of connecting resistances of access 40 Ω; If Ir is > 0.1A still, then access three points of connecting resistances of resistance 100 Ω, disconnect two points of connecting resistances simultaneously, if now Ir≤0.1A, then keep the resistance of three taps accesses; If Ir is > 0.1A still, then access four points of connecting resistances of resistance 400 Ω, disconnect three taps simultaneously, if now Ir≤0.1A, then keep the resistance of four taps accesses; If Ir is > 0.1A still, then access five points of connecting resistances of resistance 1000 Ω.
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