CN103558451B - Double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device - Google Patents
Double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device Download PDFInfo
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- CN103558451B CN103558451B CN201310533313.9A CN201310533313A CN103558451B CN 103558451 B CN103558451 B CN 103558451B CN 201310533313 A CN201310533313 A CN 201310533313A CN 103558451 B CN103558451 B CN 103558451B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 230000001939 inductive effect Effects 0.000 claims abstract description 7
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 239000012212 insulator Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 230000002457 bidirectional effect Effects 0.000 abstract description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
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- 239000002828 fuel tank Substances 0.000 description 1
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Abstract
The invention discloses a kind of double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device, solve prior art causes affecting the normal operation of electrical network problem on the mode of operation that apparatus for fixing transformer ground current carries out power failure current limliting.Folder ground outlet (9) is connected with switching circuit input end (21) through rear from the coil of the first current transformer (10), the two ends of the secondary side inductive coil of two current transformers are connected with two input interfaces of AD conversion interface circuit respectively, the output terminal of AD conversion interface circuit (15) is connected with single-chip microcomputer (17), and switching circuit output end (22) is connected with earth terminal (6); Impedance unit as three switching branch roads of Limited Current impedance unit all adopts the break-make of bidirectional thyristor controlling brancher, and by controlling conduction angle, leading to and breaking of energy control group branch road, realizes the switching of impedance unit.The present invention is workable, has ensured that the normal safe of electrical network runs.
Description
Technical field
The present invention relates to a kind of control device of converting equipment ground current, particularly a kind of device clamp earthing current in transformer being carried out to monitoring regulation and control.
Background technology
When transformer runs, can form uneven electric field in Transformer Winding and between lead-in wire and fuel tank, the hardware such as transformer core and folder thereof is all in this electric field.Apparatus for fixing transformer by the lotus root cooperation of electric capacity with producing floating potential, when the potential difference (PD) of miscellaneous part in the floating potential on folder and transformer adds up to reach certain value, insulation therebetween can be punctured, and produce spark discharge, also can by transformer scaling loss time serious.Therefore, apparatus for fixing transformer must carry out ground connection effectively, also should avoid the multipoint earthing of apparatus for fixing transformer simultaneously.When apparatus for fixing transformer generation multipoint earthing, can make to form closed path loop between folder and ground, because folder loop resistance is little, the numerical value forming the clamp earthing current in closed path loop is more much bigger than iron core grounding current during transformer core grounding, even can reach hundreds of amperes, so large ground current is enough to the damage causing transformer.Existing transformer does not all install clamp earthing current on-line monitoring and regulation device.At present, during apparatus for fixing transformer generation multipoint earthing, generally complete current limliting by carrying out series resistor after power failure, require also high to the resistive performance of serial connection, namely require that the thermal capacity of current-limiting resistance is larger, also require that current-limiting resistance will possess certain heat-sinking capability, the mode of operation that current limliting is carried out in this power failure has badly influenced the reliable power supply of electrical network.
Summary of the invention
The invention provides a kind of double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device, solve prior art causes affecting the reliability service of electrical network technical matters on the mode of operation that apparatus for fixing transformer ground current carries out power failure current limliting.
The present invention solves above technical matters by the following technical programs:
A kind of double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device, comprise oil tank of transformer, transformer core is provided with in oil tank of transformer, transformer upper clamping piece and transformer lower clamping piece is respectively arranged with at the two ends of transformer core, folder is respectively arranged with coupling bolt on folder grounding connection sheet and arm-tie on the transformer, transformer lower clamping piece is provided with coupling bolt under arm-tie, arm-tie is provided with arm-tie between coupling bolt under coupling bolt and arm-tie, folder ground outlet suspension insulator is fixedly installed outside the casing of oil tank of transformer, first current transformer and the second current transformer are fixedly suspended on folder ground outlet suspension insulator, insulating gel is provided with between the first current transformer and the second current transformer, one end of folder ground outlet is fixedly connected with folder grounding connection sheet through after apparatus for fixing transformer extension line sleeve pipe, the other end of folder ground outlet is connected with switching circuit input end through rear from the coil of the first current transformer, the two ends of the secondary side inductive coil of the first current transformer are connected with two input interfaces of AD conversion interface circuit respectively, the two ends of the secondary side inductive coil of the second current transformer are connected with another two input interfaces of AD conversion interface circuit respectively, the output terminal of AD conversion interface circuit is connected with single-chip microcomputer, switching circuit output end is connected with earth terminal, the short circuiting switch group that two thyristors being connected with reverse parallel connection between switching circuit input end and switching circuit output end form, the control end of the thyristor of two reverse parallel connections of short circuiting switch group is connected with single-chip microcomputer respectively, the first switching branch road is formed after resistor, inductor and the Thyristors in series by two reverse parallel connections, the control end of the thyristor of two reverse parallel connections is connected with single-chip microcomputer respectively, is connected between switching circuit input end and switching circuit output end after the first switching branch road is in parallel with short circuiting switch group.
The second switching branch road and the 3rd switching branch road is also parallel with respectively between switching circuit input end and switching circuit output end, the structure of the second switching branch road is identical with the structure of the first switching branch road, and the structure of the 3rd switching branch road is identical with the structure of the first switching branch road.
Single-chip microcomputer is connected to LCD Current Display, multipoint earthing of clamping piece fault current record cell, multipoint earthing of clamping piece alarm and background monitoring computer.
The present invention significantly reduces the working strength of operations staff, the situation of change of clamp earthing current value just can be monitored in real time online on monitoring backstage, once after monitoring multipoint earthing of clamping piece fault, impedance unit is incision automatically just, avoid the further expansion of transformer fault scope, this device sends alerting signal to backstage simultaneously, and alarm lamp is bright on the spot, for operations staff's interruption maintenance provides foundation.The present invention is workable, runs without any negative interaction transformer safety, has ensured that the normal safe of electrical network runs.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
A kind of double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device, comprise oil tank of transformer 1, transformer core 2 is provided with in oil tank of transformer 1, transformer upper clamping piece 3 and transformer lower clamping piece 5 is respectively arranged with at the two ends of transformer core 2, folder 3 is respectively arranged with coupling bolt 23 on folder grounding connection sheet 4 and arm-tie on the transformer, transformer lower clamping piece 5 is provided with coupling bolt 24 under arm-tie, arm-tie is provided with arm-tie 25 between coupling bolt 24 under coupling bolt 23 and arm-tie, folder ground outlet suspension insulator 8 is fixedly installed outside the casing of oil tank of transformer 1, first current transformer 10 and the second current transformer 12 are fixedly suspended on folder ground outlet suspension insulator 8, insulating gel 11 is provided with between the first current transformer 10 and the second current transformer 12, one end of folder ground outlet 9 is fixedly connected with folder grounding connection sheet 4 through after apparatus for fixing transformer extension line sleeve pipe 7, the other end of folder ground outlet 9 is connected with switching circuit input end 21 through rear from the coil of the first current transformer 10, the two ends of the secondary side inductive coil 13 of the first current transformer 10 are connected with two input interfaces of AD conversion interface circuit 15 respectively, the two ends of the secondary side inductive coil 14 of the second current transformer 12 are connected with another two input interfaces of AD conversion interface circuit 15 respectively, the output terminal of AD conversion interface circuit 15 is connected with single-chip microcomputer 17, switching circuit output end 22 is connected with earth terminal 6, the short circuiting switch group 26 that two thyristors being connected with reverse parallel connection between switching circuit input end 21 and switching circuit output end 22 form, the control end of the thyristor of two reverse parallel connections of short circuiting switch group 26 is connected with single-chip microcomputer 17 respectively, resistor 28, inductor 29 and the thyristor 27 by two reverse parallel connections form the first switching branch road after connecting, the control end of the thyristor 27 of two reverse parallel connections is connected with single-chip microcomputer 17 respectively, is connected between switching circuit input end 21 and switching circuit output end 22 after the first switching branch road is in parallel with short circuiting switch group 26.
The second switching branch road and the 3rd switching branch road is parallel with respectively between switching circuit input end 21 and switching circuit output end 22, the structure of the second switching branch road is identical with the structure of the first switching branch road, and the structure of the 3rd switching branch road is identical with the structure of the first switching branch road.
Single-chip microcomputer 17 is connected to LCD Current Display 16, multipoint earthing of clamping piece fault current record cell 18, multipoint earthing of clamping piece alarm 20 and background monitoring computer 19.
The present invention gathers electric current respectively by double-current mutual inductor, a current transformer is enclosed within folder ground lead, the electric current surveyed is except clamp earthing current Ir, also have the interference current Ig that the other factorses such as leakage field produce, another current transformer is the interference current Ig detected because the other factorses such as leakage field produce.Clamp earthing current is the difference between currents that two current transformers are measured.The method eliminates the interference of leakage field by double-current mutual inductor, solves the problem that Site Detection data are bigger than normal, improves the accuracy of test.
When transformer normally runs, as three switching branch roads of Limited Current impedance unit by short circuit.When folder generation multipoint earthing, drop into Limited Current impedance unit.Switching branch road 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 generation multipoint earthing, often loop current frequency is higher, drop into impedance to be equivalent to be connected in series resistance and reactance in the loop, especially reactance 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.
Impedance unit as three switching branch roads of Limited Current impedance unit all adopts the break-make of bidirectional thyristor controlling brancher, and by controlling conduction angle, leading to and breaking of energy control group branch road, realizes the switching of impedance unit.Classic method 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.
Clamp earthing current indication range of the present invention is wide, meets the accuracy requirement of different range.Gather clamp earthing current by signal transacting, A/D converting unit, LCD display unit shows.Program adopts segmentation Presentation Function, can accuracy requirement be met, can sensing 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 ground current is less than 0.1A, display precision rank reaches 0.1mA; When ground current is between 0.1A to 1A, display precision rank is 0.001A; When ground current is between 1A to 100A, display precision rank is 0.01A.
Claims (3)
1. a double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device, comprise oil tank of transformer (1), transformer core (2) is provided with in oil tank of transformer (1), transformer upper clamping piece (3) and transformer lower clamping piece (5) is respectively arranged with at the two ends of transformer core (2), it is characterized in that, folder (3) is respectively arranged with coupling bolt (23) on folder grounding connection sheet (4) and arm-tie on the transformer, transformer lower clamping piece (5) is provided with coupling bolt (24) under arm-tie, arm-tie is provided with arm-tie (25) between coupling bolt (24) under coupling bolt (23) and arm-tie, folder ground outlet suspension insulator (8) is fixedly installed outside the casing of oil tank of transformer (1), first current transformer (10) and the second current transformer (12) are fixedly suspended on folder ground outlet suspension insulator (8), insulating gel (11) is provided with between the first current transformer (10) and the second current transformer (12), one end of folder ground outlet (9) is fixedly connected with folder grounding connection sheet (4) afterwards through apparatus for fixing transformer extension line sleeve pipe (7), the other end of folder ground outlet (9) is connected with switching circuit input end (21) through rear from the coil of the first current transformer (10), the two ends of the secondary side inductive coil (13) of the first current transformer (10) are connected with two input interfaces of AD conversion interface circuit (15) respectively, the two ends of the secondary side inductive coil (14) of the second current transformer (12) are connected with another two input interfaces of AD conversion interface circuit (15) respectively, the output terminal of AD conversion interface circuit (15) is connected with single-chip microcomputer (17), switching circuit output end (22) is connected with earth terminal (6), the short circuiting switch group (26) that two thyristors being connected with reverse parallel connection between switching circuit input end (21) and switching circuit output end (22) form, the control end of the thyristor of two reverse parallel connections of short circuiting switch group (26) is connected with single-chip microcomputer (17) respectively, resistor (28), inductor (29) and the thyristor (27) by two reverse parallel connections form the first switching branch road after connecting, the control end of the thyristor (27) of two reverse parallel connections is connected with single-chip microcomputer (17) respectively, is connected between switching circuit input end (21) and switching circuit output end (22) after the first switching branch road is in parallel with short circuiting switch group (26).
2. a kind of double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device according to claim 1, it is characterized in that, the second switching branch road and the 3rd switching branch road is parallel with respectively between switching circuit input end (21) and switching circuit output end (22), the structure of the second switching branch road is identical with the structure of the first switching branch road, and the structure of the 3rd switching branch road is identical with the structure of the first switching branch road.
3. a kind of double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device according to claim 1 and 2, it is characterized in that, single-chip microcomputer (17) is connected to LCD Current Display (16), multipoint earthing of clamping piece fault current record cell (18), multipoint earthing of clamping piece alarm (20) and background monitoring computer (19).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310533313.9A CN103558451B (en) | 2013-11-02 | 2013-11-02 | Double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310533313.9A CN103558451B (en) | 2013-11-02 | 2013-11-02 | Double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device |
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| Publication Number | Publication Date |
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| CN103558451A CN103558451A (en) | 2014-02-05 |
| CN103558451B true CN103558451B (en) | 2015-11-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015180002A1 (en) * | 2014-05-29 | 2015-12-03 | 国家电网公司 | Apparatus for judging failure of iron core and clamping part of ultra-high voltage electric reactor, and processing and eliminating same online |
| CN115811035B (en) * | 2023-01-29 | 2023-07-25 | 国网山西省电力公司电力科学研究院 | Device and method for selecting optimal current limiting impedance of multipoint grounding current of transformer core |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201589828U (en) * | 2009-12-01 | 2010-09-22 | 河南省电力公司商丘供电公司 | Transformer clamp multipoint earthing on-line monitoring device |
| CN102411084A (en) * | 2011-07-26 | 2012-04-11 | 东北电力科学研究院有限公司 | Online monitoring device and method of grounding current of iron core of transformer |
| CN202906454U (en) * | 2012-11-28 | 2013-04-24 | 国家电网公司 | Transformer iron core and clamp multi-point grounding automatic current limiting safety device |
| CN203630208U (en) * | 2013-11-02 | 2014-06-04 | 国家电网公司 | Double-current-transformer online monitoring transformer clamp multipoint grounding current control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5657966A (en) * | 1979-10-17 | 1981-05-20 | Sumitomo Electric Ind Ltd | Grounding method of transformer for grounding |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201589828U (en) * | 2009-12-01 | 2010-09-22 | 河南省电力公司商丘供电公司 | Transformer clamp multipoint earthing on-line monitoring device |
| CN102411084A (en) * | 2011-07-26 | 2012-04-11 | 东北电力科学研究院有限公司 | Online monitoring device and method of grounding current of iron core of transformer |
| CN202906454U (en) * | 2012-11-28 | 2013-04-24 | 国家电网公司 | Transformer iron core and clamp multi-point grounding automatic current limiting safety device |
| CN203630208U (en) * | 2013-11-02 | 2014-06-04 | 国家电网公司 | Double-current-transformer online monitoring transformer clamp multipoint grounding current control device |
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