CN105207173A - Device and method for monitoring, controlling and eliminating multipoint grounding of high-capacity transformer - Google Patents
Device and method for monitoring, controlling and eliminating multipoint grounding of high-capacity transformer Download PDFInfo
- Publication number
- CN105207173A CN105207173A CN201410234847.6A CN201410234847A CN105207173A CN 105207173 A CN105207173 A CN 105207173A CN 201410234847 A CN201410234847 A CN 201410234847A CN 105207173 A CN105207173 A CN 105207173A
- Authority
- CN
- China
- Prior art keywords
- current
- transformer
- folder
- resistance
- iron core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Protection Of Transformers (AREA)
Abstract
The invention belongs to the field of transformer equipment and provides a dual-transformer device for monitoring, controlling and eliminating multipoint grounding in a high-capacity transformer. The device comprises grounding outgoing line supporting insulators; current transformers; two groups of electric unit respectively composed of a current-limiting impedance unit, a multipoint grounding elimination unit and two reversely-parallel thyristors which are connected in parallel; an AD conversion interface circuit; and a single-chip microcomputer. Each grounding outgoing line penetrates through a primary coil of a first current transformer and then reaches a grounding end through the current-limiting impedance unit, the multipoint grounding elimination unit and two reversely-parallel thyristors which are connected in parallel. The device provided by the invention is capable monitoring the change condition of a grounding current on line in real time, once a grounding fault is detected, fault elimination is firstly performed, and if the effect is not ideal, the current-limiting impedance units are automatically switched in, so that the further enlargement of the fault is avoided, a basis is provided to operation personnel for power-off maintenance, and the device has no negative effects on the safe operation of the transformer.
Description
Technical field
The invention belongs to transformer equipment field, be specifically related to a kind of device for eliminating transformer multipoint earthing.
Background technology
High-power transformer iron core and folder must carry out effectively reliably ground connection, otherwise can cause folder, iron core floating potential, that is, a certain position in equipment have accumulated a large amount of electric charge owing to not having ground connection, defines a potential difference between these electric charges and the earth.
When the potential difference of miscellaneous part in floating potential and transformer adds up to reach certain value, insulation therebetween can be punctured, and produce sparkover, also can by transformer scaling loss time serious.When apparatus for fixing transformer, iron core generation multipoint earthing, can make folder, iron core respectively and between ground, form closed path loop, much bigger when induced potential effect lower core and the normal operation of clamp earthing current ratio, so large earth current will cause the damage of transformer.At present, when apparatus for fixing transformer, iron core generation multipoint earthing, mainly by what carry out series resistor to process after power failure, the normal safe that this mode needing power failure to carry out processing has badly influenced electrical network runs.
Summary of the invention
For the technical problem that this area exists, the two instrument transformers that the object of the invention is to propose a kind of high-power transformer multipoint earthing are monitored, are controlled and cancellation element.
Another object of the present invention is the two instrument transformer monitorings proposing a kind of high-power transformer multipoint earthing, the method controlling and eliminate.
The technical scheme realizing the object of the invention is:
A kind of monitoring of high-power transformer floating potential, control and cancellation element, described transformer comprises oil tank of transformer, iron core, is positioned at the folder at iron core two ends, described folder and iron core are all connected with ground outlet, described ground outlet is from oil tank of transformer Base top contact, through lead-out wire sleeve pipe, outside oil tank of transformer, extend to the earth terminal on ground;
Described pair of instrument transformer monitoring, control and cancellation element comprise: two ground outlet supporting insulators, two groups of current transformers all containing the first current transformer and the second current transformer, two groups of electric units of the thyristor composition of unit and two reverse parallel connections are eliminated by the current-limiting impedance element of parallel connection, multipoint earthing, AD conversion interface circuit, and single-chip microcomputer;
The ground outlet supporting insulator of folder is fixedly installed outside the casing of oil tank of transformer, the first current transformer and second current transformer of folder is hung with under the ground outlet supporting insulator of described folder, the primary winding of the first current transformer is passed in the ground outlet of described folder, then eliminated the thyristor of unit and two reverse parallel connections by current-limiting impedance element in parallel, multipoint earthing, then arrive earth terminal;
Cored ground outlet supporting insulator is fixedly installed outside the casing of oil tank of transformer, the first current transformer and second current transformer of iron core is hung with under the ground outlet supporting insulator of described iron core, the primary winding of the first current transformer is passed in the ground outlet of described folder, then eliminated the thyristor of unit and two reverse parallel connections processed by current-limiting impedance element in parallel, multipoint earthing, then arrive earth terminal;
The two ends of the secondary coil of two described the first current transformers connect the input of described AD conversion interface circuit, and the output of described AD conversion interface circuit connects described single-chip microcomputer.
Wherein, described current-limiting impedance element comprises winding and insulating cylinder, and described winding is wrapped on insulating cylinder, winding is connected with 5 taps, and each point connects the switches set being provided with and being made up of two reverse parallel connection thyristors.The all-in resistance of described winding is 1000 Ω.
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 multipoint earthing is eliminated unit and 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 thyristor.
Preferably, described step down side voltage is 220V, and high side voltage is 1000V.
Preferred further, 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, earth current (Ir+Ig) and the disturbance current Ig of iron core lead-out wire is monitored respectively with two current transformers, calculate the difference Ir of two current transformer data, as Ir > 0.1A, be then the resistance of 10-1000 Ω to iron core lead-out wire access resistance, access capacity is the pulsed capacitance of 2 μ F simultaneously, discharges to iron core lead-out wire.
Similarly, earth current (Ir+Ig) and the disturbance current Ig of folder lead-out wire is monitored respectively with two current transformers, calculate the difference Ir of two current transformer data, as Ir > 0.1A, be then the resistance of 10-1000 Ω to folder lead-out wire access resistance, access capacity is the pulsed capacitance of 2 μ F simultaneously, discharges to folder lead-out wire.
Further, the resistance accessed to iron core and/or folder lead-out wire by switches set grading 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 significantly reduces the working strength of operations staff, just folder can be monitored online in real time on monitoring backstage, the situation of change of iron core grounding current value, once monitor folder, after multipoint earthing of iron core fault, first Failure elimination is carried out, after effect is undesirable, by the just incision automatically of current-limiting resistance unit, avoid the further expansion of transformer fault scope, this device sends alarm signal to backstage simultaneously, alarm lamp is bright on the spot, for operations staff's interruption maintenance provides foundation, and this device runs without any negative interaction transformer safety.
Accompanying drawing explanation
Fig. 1 is that the two instrument transformer monitoring of the present invention, control and cancellation element arrange schematic diagram outside oil tank of transformer.
Fig. 2 is oil tank of transformer cut-away view.
Fig. 3 is the circuit diagram of current-limiting impedance element.
Fig. 4 is the circuit diagram that multipoint earthing eliminates unit.
In figure, 1 is oil tank of transformer, 2 is transformer core, 3 is lower clamping piece, 4 is upper clamping piece, 5 is soft wiring, 6 is arm-tie, 7 is ground strip, 8 is folder small casing, 9 is iron core small casing, 10 is folder ground outlet, 11 is iron core lead-out wire, 12 is earth terminal, 13 is the second current transformer of folder, 14 is the first current transformer 14 of folder, 15 is folder ground outlet supporting insulator, 16 is the second current transformer of iron core, 17 is the first current transformer of iron core, 18 is iron core grounding lead-out wire supporting insulator, 19 is AD conversion interface circuit, 20 is LCD display, 21 is single-chip microcomputer, 22 is multipoint earth faults electric current record cell, 23 is multipoint earthing alarm, 24 is background monitoring computer, 25 is folder current-limiting impedance element, 26 is multipoint earthing of clamping piece elimination unit, 27 is iron core current-limiting impedance element, 28 is multipoint earthing of iron core elimination unit, 29, 30, 31, 32, , 43, 44, 41, 46, 47, 48, 49, 50, 51, 52, 53, 54 is that (every two is one group of reverse parallel connection to thyristor, each component belongs to different circuit), 33 is left socle, and 34 is right support, 35 is insulating cylinder, 36 is winding one tap, and 37 is winding two tap, and 38 is winding three tap, 39 is winding four tap, 40 is winding five tap, and 42 is transformer, and 45 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 instrument transformers monitorings of the inner multipoint earthing of a kind of high-power transformer, control and cancellation element, this high-power transformer is oil-filled transformer, comprises oil tank of transformer 1, cored 2 in fuel tank, folder and winding.The two ends of iron core 2 are respectively arranged with upper clamping piece 4 and lower clamping piece 3, and upper clamping piece 4 is connected by arm-tie 6 with lower clamping piece 3, and arm-tie 6 is connected by soft wiring 5 with lower clamping piece 3.Iron core grounding sheet 7 is drawn by iron core lead-out wire 11, iron core small casing 9, and folder ground connection is drawn by folder ground outlet 10, folder small casing 8.
Outside the casing of oil tank of transformer 1, be fixedly installed iron core grounding lead-out wire supporting insulator 18, folder ground outlet supporting insulator 15, the first current transformer 14, second current transformer 13 of folder is fixedly suspended on folder ground outlet supporting insulator 15; Equally, iron core draw on-line monitoring iron core grounding current first, second current transformer 17,16, be suspended on supporting insulator 18;
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 current-limiting impedance element 25 of parallel connection, multipoint earthing of clamping piece elimination unit 26 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 19 respectively, the two ends of the secondary side induction coil of the second current transformer 13 are connected with another two input interfaces of AD conversion interface circuit 19 respectively, the output of AD conversion interface circuit 19 is connected with single-chip microcomputer 21, and folder current-limiting impedance element 25, multipoint earthing of clamping piece are eliminated unit 26 and be connected with earth terminal with thyristor 31,32 output of two reverse parallel connections.The control end of thyristor connects single-chip microcomputer 21.
Similar, iron core grounding lead-out wire 11 eliminate ground connection after unit 28 through after transformer core lead-out wire sleeve pipe 9 through two current transformers (first current transformer 18 and the second current transformer 17), iron core current-limiting impedance element 27 and multipoint earthing of iron core.Iron core grounding lead-out wire 11 passes from the primary winding of the first current transformer 18, then with current-limiting impedance element 27, multipoint earthing eliminates unit 28 and the thyristor 30 of two reverse parallel connections is connected with the input of 29, wherein current-limiting impedance circuit 27, Failure elimination device 28, the thyristor 29 and 30 of two reverse parallel connections is parallel relationship, the two ends of the secondary side induction coil of the first current transformer 17 are connected with two input interfaces of AD conversion interface circuit 19 respectively, the two ends of the secondary side induction coil of the second current transformer 16 are connected with another two input interfaces of AD conversion interface circuit 21 respectively, the output of AD conversion interface circuit 19 is connected with single-chip microcomputer 21.
Wherein, folder current-limiting impedance element 27 is identical with the electrical structure of iron core current-limiting impedance element 25, 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.In the present embodiment, the resistance of winding is 1000 Ω.This winding is with 5 taps, and the number of turn between each tap is not identical, and the turn ratio of tap is 10:40:100:400:1000.See Fig. 3, iron core current-limiting impedance element 27 comprises passive left socle 33 and right support 34, insulating cylinder 35, around the winding on insulating cylinder, winding is connected with winding one tap 36 every the identical number of turn, winding two tap 37, winding three tap 38, winding four tap 39, winding five tap 40, each point connects the switches set being all in series with and being made up of the thyristor of two parallel connected in reverse phase: the thyristor 41 of two parallel connected in reverse phase of controlled winding one tap 36, 46, the thyristor 47 of two parallel connected in reverse phase of winding two tap 37, 48, the thyristor 49 of two parallel connected in reverse phase of winding three tap 38, 50, the thyristor 51 of two parallel connected in reverse phase of winding four tap 39, 52, the thyristor 53 of two parallel connected in reverse phase of winding five tap 40, 54.
The electrical structure that multipoint earthing of clamping piece eliminates unit 28, multipoint earthing of iron core eliminates unit 26 is the same, is all made up of (Fig. 4) the thyristor 43 and thyristor 44, transformer 42 and pulsed capacitance 45 that play on-off action.Transformer is connected with thyristor parallel branch, the branch circuit parallel connection of pulsed capacitance 45 and transformer and thyristor.Pulsed capacitance capacity is 2 μ F.The parameter of transformer 42 is low-pressure side voltage 220V, high side voltage 1000V.
Single-chip microcomputer 21 is also connected with the LCD display 20, multipoint earth faults electric current record cell 22, multipoint earthing alarm 23 and the background monitoring computer 24 that show electric current.
Embodiment 2:
The device of Application Example 1, the step monitoring, control and eliminate multipoint earthing is: after single-chip microcomputer 21 accepts the signal of the input signal of the secondary side induction coil of the first current transformer, the secondary side induction coil of the second current transformer, as calculated, if record folder or iron core grounding current is less than 0.1 ampere, then single-chip microcomputer controls the short 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;
After single-chip microcomputer accepts the signal of the input signal of the secondary side induction coil of the first current transformer and the secondary side induction coil of the second current transformer, as calculated, if record clamp earthing current to be greater than 0.1 ampere, then single-chip microcomputer 21 controls the short switch group cut-off that two Switched Thyristors (31 and 32) form, multipoint earth faults is eliminated the thyristor 43 of unit 26, 44 control conducting, transformer 42 paired pulses electric capacity 45 charges, thyristor 43 is controlled after charging complete, 44 cut-offs, pulsed capacitance 45 is accessed folder lead-out wire 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 switch group 31, the 32 conducting ground connection of Single-chip Controlling two Switched Thyristors composition, now current-limiting impedance element 25 and multipoint earth faults cancellation element 26 do not work.The second situation, if record clamp earthing current be still greater than 0.1 ampere, directly controls thyristor (the 41 and 46) conducting of current-limiting impedance element, current-limiting impedance element 25 cut-in operation:
Folder current-limiting impedance element 25 has 5 taps, first thyristor 41,46 conducting access winding one tap 36 is controlled, if clamp earthing current is also greater than 0.1 ampere, winding one tap 36 is disconnected by controlling thyristor 41,46 cut-off, control thyristor 47,48 conducting access winding two tap 37, if now clamp earthing current is still greater than 0.1 ampere, disconnect winding two tap 37, by controlling thyristor 49,50 conducting access winding three tap 38 by controlling thyristor 47,48 cut-off; If similar clamp earthing current is still greater than 0.1 ampere, disconnects winding three tap 38 and access the 4th tap 39 simultaneously, if clamp earthing current is also greater than 0.1 ampere, disconnect winding four tap 39, until access winding five tap 40.
Similarly, after single-chip microcomputer accepts the signal of the input signal of the secondary side induction coil of the first current transformer and the secondary side induction coil of the second current transformer, as calculated, if record iron core grounding current to be greater than 0.1 ampere, then single-chip microcomputer 21 controls short switch group 29 and 30 cut-off of two Switched Thyristors compositions, by the thyristor 43 of multipoint earth faults cancellation element 28, 44 control conducting, transformer 42 paired pulses electric capacity 45 charges, thyristor 43 is controlled after charging complete, 44 cut-offs, pulsed capacitance 45 is accessed lead-out wire 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 switch group 29, the 30 conducting ground connection of Single-chip Controlling two Switched Thyristors composition, now current-limiting impedance element 27 and multipoint earth faults cancellation element 28 do not work.The second situation, if record iron core grounding current be still greater than 0.1 ampere, directly controls the turn on thyristors of current-limiting impedance element, iron core current-limiting impedance element 27 cut-in operation.Iron core current-limiting impedance element 27 working method is identical with folder current-limiting impedance element working method.
The present invention gathers electric current respectively by two current transformers, a current transformer is enclosed within folder or iron core grounding lead-in wire respectively, the electric current (Ig+Ir) surveyed is except folder or iron core grounding current Ir, also have the disturbance current Ig that the other factorses such as leakage field produce, another current transformer is the disturbance current Ig detected because the other factorses such as leakage field produce.Folder or iron core grounding current Ir are the difference between currents of (Ig+Ir) and disturbance current Ig.This process eliminate the interference of leakage field, solve transformer field and detect data problem bigger than normal, improve the accuracy of test.
When high-power transformer normally runs, as the thyristor short circuit that Limited Current resistance unit, multipoint earthing cancellation element are all switched on.When folder or iron core generation multipoint earthing, drop into multipoint earthing cancellation element, Limited Current resistance unit.Current-limiting impedance element uses the winding of band 5 taps.When folder or iron core generation multipoint earthing, often loop current frequency is higher, drop into tap winding to be equivalent to be connected in series resistance and inductance in the loop, especially the inductance of winding significantly limit high-frequency current, now on resistance, electric current is little, thermal capacity requires low, solves and only relies on series resistor thermal capacity to require high problem.
Break-make as Limited Current impedance unit, Failure elimination unit etc. all adopts the break-make of bidirectional thyristor controlling brancher, by controlling the angle of flow, and can controlling brancher logical and disconnected.Conventional method adopts switch, because sparking appears in the frequent break-make of switch band electric current, had a strong impact on the useful life of switch.And adopting thyristor control, cost performance is high, and afterflow ability is strong, does not occur sparking, and useful life is unaffected, solves the problem in Traditional control switch useful life.
Folder of the present invention, iron core grounding current indication range are wide, meet the required precision of different range.Gather clamp earthing current by signal transacting, A/D converting unit, LCD display unit shows.Program adopts segmentation Presentation Function, can required precision be met, can detection range be met again, solve the problem of the little and display precision deficiency of on-the-spot test scope.In electric current maximum magnitude 100A, by different range segmentation display, when earth current is less than 0.1A, display precision rank reaches 0.1mA; When earth current is between 0.1A to 1A, display precision rank is 0.001A; When earth current is between 1A to 100A, display precision rank is 0.01A.
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 engineers and technicians in this area make technical scheme of the present invention and improvement, all should fall in protection range that claims of the present invention determine.
Claims (8)
1. the monitoring of a high-power transformer multipoint earthing, control and cancellation element, described transformer comprises oil tank of transformer, iron core, is positioned at the folder of iron core both sides, described folder and iron core are all connected with ground outlet, described ground outlet is from oil tank of transformer Base top contact, through lead-out wire sleeve pipe, outside oil tank of transformer, extend to the earth terminal on ground;
It is characterized in that, described pair of instrument transformer monitoring, control and cancellation element comprise: two ground outlet supporting insulators, two groups of current transformers all containing the first current transformer and the second current transformer, two groups of electric units of the thyristor composition of unit and two reverse parallel connections are eliminated by the current-limiting impedance element of parallel connection, multipoint earthing, AD conversion interface circuit, and single-chip microcomputer;
The ground outlet supporting insulator of folder is fixedly installed outside the casing of oil tank of transformer, the first current transformer and second current transformer of folder is hung with under the ground outlet supporting insulator of described folder, the primary winding of the first current transformer is passed in the ground outlet of described folder, then eliminated the thyristor of unit and two reverse parallel connections by current-limiting impedance element in parallel, multipoint earthing, then arrive earth terminal;
Cored ground outlet supporting insulator is fixedly installed outside the casing of oil tank of transformer, the first current transformer and second current transformer of iron core is hung with under the ground outlet supporting insulator of described iron core, the primary winding of the first current transformer is passed in the ground outlet of described folder, then eliminated the thyristor of unit and two reverse parallel connections by current-limiting impedance element in parallel, multipoint earthing, then arrive earth terminal;
The two ends of the secondary coil of two described the first current transformers connect the input of described AD conversion interface circuit, and the output of described AD conversion interface circuit connects described single-chip microcomputer.
2. monitoring according to claim 1, control and cancellation element, it is characterized in that, described current-limiting impedance element 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.
3. monitoring according to claim 2, control and cancellation element, 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.
4. monitoring according to claim 1, control and cancellation element, it is characterized in that, described multipoint earthing is eliminated unit and is made up of the thyristor of transformer, two reverse parallel connections and pulsed capacitance, described transformer is connected with thyristor parallel branch, the branch circuit parallel connection of pulsed capacitance and transformer and thyristor.
5. monitoring according to claim 4, control and cancellation element, is characterized in that, described step down side voltage is 220V, and high side voltage is 1000V.
6., according to the arbitrary described two instrument transformer monitorings of claim 1-5, control and cancellation element, 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.
7. the monitoring of a high-power transformer multipoint earthing, control and removing method, it is characterized in that, earth current (Ir+Ig) and the disturbance current Ig of iron core lead-out wire is monitored respectively with two current transformers, calculate the difference Ir of two current transformer data, as Ir > 0.1A, be then the resistance of 10-1000 Ω to iron core lead-out wire access resistance, access capacity is the pulsed capacitance of 2 μ F simultaneously, discharges to iron core lead-out wire.
Similarly, earth current (Ir+Ig) and the disturbance current Ig of folder lead-out wire is monitored respectively with two current transformers, calculate the difference Ir of two current transformer data, as Ir > 0.1A, be then the resistance of 10-1000 Ω to folder lead-out wire access resistance, access capacity is the pulsed capacitance of 2 μ F simultaneously, discharges to folder lead-out wire.
8. monitoring according to claim 7, control and removing method, is characterized in that, the resistance accessed to iron core and/or folder lead-out wire by switches set grading 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 1 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410234847.6A CN105207173A (en) | 2014-05-29 | 2014-05-29 | Device and method for monitoring, controlling and eliminating multipoint grounding of high-capacity transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410234847.6A CN105207173A (en) | 2014-05-29 | 2014-05-29 | Device and method for monitoring, controlling and eliminating multipoint grounding of high-capacity transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105207173A true CN105207173A (en) | 2015-12-30 |
Family
ID=54954685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410234847.6A Pending CN105207173A (en) | 2014-05-29 | 2014-05-29 | Device and method for monitoring, controlling and eliminating multipoint grounding of high-capacity transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105207173A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541364A (en) * | 2018-09-25 | 2019-03-29 | 广西电网有限责任公司电力科学研究院 | High-power transformer multipoint earthing of clamping piece breakdown judge and method of disposal |
| CN111064355A (en) * | 2019-11-22 | 2020-04-24 | 西安许继电力电子技术有限公司 | Suspension potential eliminating circuit |
| CN115825809A (en) * | 2023-02-17 | 2023-03-21 | 国网山西省电力公司电力科学研究院 | Transformer core multipoint ground fault simulation device and evaluation method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203119459U (en) * | 2012-12-27 | 2013-08-07 | 衢州日新电气有限公司 | Power transformer iron core grounding protection device |
| CN103560485A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Method for controlling transformer clamping piece multi-point grounding currents under monitoring of double current transformers |
| CN203983953U (en) * | 2014-05-29 | 2014-12-03 | 国网山西省电力公司电力科学研究院 | Two instrument transformer monitorings, control and the cancellation element of high-power transformer multipoint earthing |
-
2014
- 2014-05-29 CN CN201410234847.6A patent/CN105207173A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203119459U (en) * | 2012-12-27 | 2013-08-07 | 衢州日新电气有限公司 | Power transformer iron core grounding protection device |
| CN103560485A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Method for controlling transformer clamping piece multi-point grounding currents under monitoring of double current transformers |
| CN203983953U (en) * | 2014-05-29 | 2014-12-03 | 国网山西省电力公司电力科学研究院 | Two instrument transformer monitorings, control and the cancellation element of high-power transformer multipoint earthing |
Non-Patent Citations (1)
| Title |
|---|
| 丁军: "大型变压器铁芯多点接地的处理探讨", 《第四届安徽科技论坛安徽省电机工程学会分论坛论文集》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541364A (en) * | 2018-09-25 | 2019-03-29 | 广西电网有限责任公司电力科学研究院 | High-power transformer multipoint earthing of clamping piece breakdown judge and method of disposal |
| CN111064355A (en) * | 2019-11-22 | 2020-04-24 | 西安许继电力电子技术有限公司 | Suspension potential eliminating circuit |
| CN111064355B (en) * | 2019-11-22 | 2023-11-17 | 西安许继电力电子技术有限公司 | Suspension potential eliminating circuit |
| CN115825809A (en) * | 2023-02-17 | 2023-03-21 | 国网山西省电力公司电力科学研究院 | Transformer core multipoint ground fault simulation device and evaluation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108594071B (en) | Single-phase earth fault detection method for neutral point small-resistance earth distribution network | |
| CN109001591A (en) | A kind of 10kV power distribution network primary equipment intelligence fortune inspection engineering test platform | |
| CN101478149A (en) | Wire selection method for power distribution network single phase earthing failure based on transient signal | |
| CN108845223B (en) | Magnetic control disturbance line selection method for arc suppression coil | |
| WO2015180002A1 (en) | Apparatus for judging failure of iron core and clamping part of ultra-high voltage electric reactor, and processing and eliminating same online | |
| CN113030636B (en) | Active intervention type arc suppression device test system | |
| CN104218593A (en) | Series capacitor compensation device for power distribution network | |
| CN105207173A (en) | Device and method for monitoring, controlling and eliminating multipoint grounding of high-capacity transformer | |
| CN106329509A (en) | Small current fault line selection protection system of power grid isolated neutral system | |
| CN106814279A (en) | Line-selected earthing device | |
| CN203983953U (en) | Two instrument transformer monitorings, control and the cancellation element of high-power transformer multipoint earthing | |
| CN103560484B (en) | Three current transformer on-line monitoring multipoint earthing of clamping piece of transformer current control devices | |
| CN202956482U (en) | Small current system single-phase grounding fault detection verifying device | |
| CN211206745U (en) | Single-phase earth fault management system | |
| CN203849329U (en) | Power distribution network grounding parameter online measuring device based on constant zero sequence voltage amplitude | |
| CN103560499B (en) | The control method of the lower multipoint earthing of clamping piece of transformer electric current of three current transformer monitorings | |
| CN207459723U (en) | Spare phase transformer quickly puts into arrangement | |
| CN105823969A (en) | Apparatus for simulating partial discharge detects of transformer | |
| CN216209604U (en) | Withstand voltage test circuit of high-voltage fast switch type current limiter | |
| CN203630208U (en) | Double-current-transformer online monitoring transformer clamp multipoint grounding current control device | |
| CN103558451B (en) | Double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device | |
| CN205720535U (en) | A kind of partial discharge of transformer defects simulation device | |
| CN103163416B (en) | Method and device for detecting branch circuit single phase earth faults | |
| CN211744020U (en) | Arc tube management intelligent line selection device | |
| CN105223457A (en) | The device and method that extra-high voltage reactor earth fault judges and processes, eliminates |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151230 |
|
| RJ01 | Rejection of invention patent application after publication |