CN203632219U - Three-current-mutual-inductor control device for performing online monitoring on multipoint grounding current of transformer clamping member - Google Patents
Three-current-mutual-inductor control device for performing online monitoring on multipoint grounding current of transformer clamping member Download PDFInfo
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- CN203632219U CN203632219U CN201320684431.5U CN201320684431U CN203632219U CN 203632219 U CN203632219 U CN 203632219U CN 201320684431 U CN201320684431 U CN 201320684431U CN 203632219 U CN203632219 U CN 203632219U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
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- 239000012212 insulator Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 abstract description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
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- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
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Abstract
The utility model discloses a three-current-mutual-inductor control device for performing online monitoring on multipoint grounding current of a transformer clamping member, and solves problems in the prior art that normal operation of a power grid is influenced by a mode of operation of power outage and current limiting on the transformer clamping member. A clamping member grounding lead-out wire (9) penetrates through a coil of a first current mutual inductor (10) and is connected with an input end (21) of a switching circuit. The two ends of secondary side sensing coils of the three current mutual inductors are respectively connected with two input interfaces of an AD conversion interface circuit. The output end of the AD conversion interface circuit (15) is connected with a single-chip microcomputer (17). The output end (22) of the switching circuit is connected with a grounding end (6). Impedance units of three switching branches acting as current-limiting impedance units adopt bidirectional thyristors to control on/off of the branches. With control of conduction angles, on and off of the impedance branches can be controlled and switching of the impedance units can be realized. The device is high in operability so that normal and safety operation of the power grid is guaranteed.
Description
Technical field
The present invention relates to a kind of control device of converting equipment earth current, particularly a kind of device of the clamp earthing current in transformer being monitored to regulation and control.
Background technology
When transformer operation, between Transformer Winding and lead-in wire and fuel tank, can form inhomogeneous electric field, the hardwares such as transformer core and folder thereof are all in this electric field.Apparatus for fixing transformer produces floating potential by the lotus root cooperation of electric capacity with meeting, in the time that the potential difference accumulative total of miscellaneous part in the floating potential on folder and transformer reaches certain value, can puncture insulation therebetween, and produce sparkover, also can be by transformer scaling loss when serious.Therefore, apparatus for fixing transformer must carry out ground connection effectively, also should avoid the multipoint earthing of apparatus for fixing transformer simultaneously.In the time of apparatus for fixing transformer generation multipoint earthing, can make to form between folder and ground closed path loop, because folder loop resistance is little, the iron core grounding current of the numerical value of clamp earthing current that forms closed path loop during than transformer core grounding is much bigger, even can reach amperes up to a hundred, so large earth current is enough to cause the damage of transformer.Clamp earthing current on-line monitoring and regulation device are not all installed on existing transformer.At present, when apparatus for fixing transformer generation multipoint earthing, generally complete current limliting by carrying out series resistor after having a power failure, require also high to the resistive performance of serial connection, require the thermal capacity of current-limiting resistance larger, also require 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 normal safe operation of electrical network.
Summary of the invention
The invention provides a kind of three current transformer on-line monitoring multipoint earthing of clamping piece of transformer current control devices, solved prior art the have a power failure mode of operation of current limliting of apparatus for fixing transformer earth current is caused to the technical problem of the normal operation that affects electrical network.
The present invention solves above technical problem by the following technical programs:
A kind of three current transformer on-line monitoring multipoint earthing of clamping piece of transformer current control devices, comprise oil tank of transformer, in oil tank of transformer, be provided with transformer core, be respectively arranged with transformer upper clamping piece and transformer lower clamping piece at the two ends of transformer core, on transformer upper clamping piece, be respectively arranged with connecting bolt on folder grounding connection sheet and arm-tie, on transformer lower clamping piece, be provided with connecting bolt under arm-tie, on arm-tie, under connecting bolt and arm-tie, between connecting bolt, be provided with arm-tie, casing outside at oil tank of transformer is fixedly installed folder ground outlet suspension insulator, the first current transformer, the second current transformer and the 3rd current transformer are fixedly suspended on folder ground outlet suspension insulator, between the first current transformer and the second current transformer, be provided with the first insulating cement, between the first current transformer and the 3rd current transformer, be provided with the second insulating cement, one end of folder ground outlet is fixedly connected with folder grounding connection sheet through after apparatus for fixing transformer lead-out wire 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 induction 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 induction coil of the second current transformer are connected with another two input interfaces of AD conversion interface circuit respectively, the two ends of the secondary side induction coil of the 3rd current transformer are connected with other two input interfaces of AD conversion interface circuit respectively, the output of AD conversion interface circuit is connected with single-chip microcomputer, switching circuit output end is connected with earth terminal, between switching circuit input end and switching circuit output end, be connected with the short switch group of two thyristor compositions of reverse parallel connection, the control end of the thyristor of two reverse parallel connections of short switch group is connected with single-chip microcomputer respectively, after resistor, inductor and the Thyristors in series by two reverse parallel connections, form the first switching branch road, the control end of the thyristor of two reverse parallel connections is connected with single-chip microcomputer respectively, after the first switching branch road is in parallel with short switch group, is connected between switching circuit input end and switching circuit output end.
Between switching circuit input end and switching circuit output end, be parallel with respectively the second switching branch road and the 3rd switching branch road, 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.
On single-chip microcomputer, be connected with respectively 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 has alleviated operations staff's working strength greatly, just can monitor online in real time the situation of change of clamp earthing current value on monitoring backstage, once monitor after multipoint earthing of clamping piece fault, impedance unit is incision automatically just, avoid the further expansion of transformer fault scope, this device sends alarm 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, and transformer safe operation, without any negative interaction, has been ensured to the normal safe operation of electrical network.
Brief description of the drawings
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 three current transformer on-line monitoring multipoint earthing of clamping piece of transformer current control devices, comprise oil tank of transformer 1, in oil tank of transformer 1, be provided with transformer core 2, be respectively arranged with transformer upper clamping piece 3 and transformer lower clamping piece 5 at the two ends of transformer core 2, on transformer upper clamping piece 3, be respectively arranged with connecting bolt 23 on folder grounding connection sheet 4 and arm-tie, on transformer lower clamping piece 5, be provided with connecting bolt 24 under arm-tie, on arm-tie, under connecting bolt 23 and arm-tie, between connecting bolt 24, be provided with arm-tie 25, casing outside at oil tank of transformer 1 is fixedly installed folder ground outlet suspension insulator 8, the first current transformer 10, the second current transformer 12 and the 3rd current transformer 14 are fixedly suspended on folder ground outlet suspension insulator 8, between the first current transformer 10 and the second current transformer 12, be provided with the first insulating cement 11, between the first current transformer 10 and the 3rd current transformer 14, be provided with the second insulating cement 13, one end of folder ground outlet 9 is fixedly connected with folder grounding connection sheet 4 through apparatus for fixing transformer lead-out wire sleeve pipe 7 is rear, 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 induction coil 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 induction coil of the second current transformer 12 are connected with another two input interfaces of AD conversion interface circuit 15 respectively, the two ends of the secondary side induction coil of the 3rd current transformer 14 are connected with other two input interfaces of AD conversion interface circuit 15 respectively, the output of AD conversion interface circuit 15 is connected with single-chip microcomputer 17, switching circuit output end 22 is connected with earth terminal 6, between switching circuit input end 21 and switching circuit output end 22, be connected with the short switch group 26 of two thyristor compositions of reverse parallel connection, the control end of the thyristor of two reverse parallel connections of short 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, after the first switching branch road is in parallel with short switch group 26, is connected between switching circuit input end 21 and switching circuit output end 22.
Between switching circuit input end 21 and switching circuit output end 22, be parallel with respectively the second switching branch road and the 3rd switching branch road, 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.
On single-chip microcomputer 17, be connected with respectively 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 respectively electric current by three current transformers, a current transformer is enclosed within on folder ground lead, the electric current of surveying is except clamp earthing current Ir, the disturbance current Ig that also has the other factorses such as leakage field to produce, another two current transformers are to detect the disturbance current Ig producing due to other factorses such as leakage fields.The mean value of the clamp earthing current electric current that another two current transformers are measured for a current value that current transformer is surveyed deducts.The method has been eliminated the interference of leakage field by three current transformers, solved Site Detection data problem bigger than normal, has improved the accuracy of test.
When transformer normally moves, as three switching branch roads of Limited Current impedance unit by short circuit.In the time of folder generation multipoint earthing, drop into Limited Current impedance unit.Switching branch road adopts resistance to add the mode of reactance, solved the problem of the high and Limited Current weak effect of current-limiting resistance capacity requirement.In the time of folder generation multipoint earthing, often loop current frequency is higher, drop into impedance and be equivalent to be connected in series resistance and reactance in loop, especially reactance has greatly limited high-frequency current, now on resistance, electric current is little, thermal capacity requires low, has solved and has only relied on series resistor thermal capacity to require high problem.
All adopt the break-make of bidirectional thyristor control branch road as the impedance unit of three switching branch roads of Limited Current impedance unit, by controlling the angle of flow, can control group branch road logical and disconnected, realize the switching of impedance unit.Conventional method is to adopt switch, because sparking appears in the frequent break-make of switch band electric current, has had a strong impact on the useful life of switch.And employing thyristor control, cost performance is high, and afterflow ability is strong, does not occur sparking, and useful life is unaffected, has solved the traditional control switch problem in useful life.
Clamp earthing current indication range of the present invention is wide, meets the required precision of different range.Gather clamp earthing current by signal processing, A/D converting unit, on LCD display unit, show.In program, adopt segmentation Presentation Function, can meet required precision, can meet again detection range, solved the problem of the little and display precision deficiency of on-the-spot test scope.In electric current maximum magnitude 100A, show by different range segmentation, in the time that earth current is less than 0.1A, display precision rank reaches 0.1mA; When earth current is between 0.1A to 1A time, display precision rank is 0.001A; When earth current is between 1A to 100A time, display precision rank is 0.01A.
Claims (3)
1. a current transformer on-line monitoring multipoint earthing of clamping piece of transformer current control device, comprise oil tank of transformer (1), in oil tank of transformer (1), be provided with transformer core (2), be respectively arranged with transformer upper clamping piece (3) and transformer lower clamping piece (5) at the two ends of transformer core (2), it is characterized in that, on transformer upper clamping piece (3), be respectively arranged with connecting bolt (23) on folder grounding connection sheet (4) and arm-tie, on transformer lower clamping piece (5), be provided with connecting bolt under arm-tie (24), under connecting bolt on arm-tie (23) and arm-tie, between connecting bolt (24), be provided with arm-tie (25), casing outside at oil tank of transformer (1) is fixedly installed folder ground outlet suspension insulator (8), the first current transformer (10), the second current transformer (12) and the 3rd current transformer (14) are fixedly suspended on folder ground outlet suspension insulator (8), between the first current transformer (10) and the second current transformer (12), be provided with the first insulating cement (11), between the first current transformer (10) and the 3rd current transformer (14), be provided with the second insulating cement (13), one end of folder ground outlet (9) is fixedly connected with folder grounding connection sheet (4) through after apparatus for fixing transformer lead-out wire 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 induction coil 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 induction coil of the second current transformer (12) are connected with another two input interfaces of AD conversion interface circuit (15) respectively, the two ends of the secondary side induction coil of the 3rd current transformer (14) are connected with other two input interfaces of AD conversion interface circuit (15) respectively, the output of AD conversion interface circuit (15) is connected with single-chip microcomputer (17), switching circuit output end (22) is connected with earth terminal (6), between switching circuit input end (21) and switching circuit output end (22), be connected with the short switch group (26) of two thyristor compositions of reverse parallel connection, the control end of the thyristor of two reverse parallel connections of short switch group (26) is connected with single-chip microcomputer (17) respectively, after resistor (28), inductor (29) and thyristor (27) series connection by two reverse parallel connections, form the first switching branch road, the control end of the thyristor (27) of two reverse parallel connections is connected with single-chip microcomputer (17) respectively, after the first switching branch road is in parallel with short switch group (26), is connected between switching circuit input end (21) and switching circuit output end (22).
2. a kind of three current transformer on-line monitoring multipoint earthing of clamping piece of transformer current control devices according to claim 1, it is characterized in that, between switching circuit input end (21) and switching circuit output end (22), be parallel with respectively the second switching branch road and the 3rd switching branch road, 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 three current transformer on-line monitoring multipoint earthing of clamping piece of transformer current control devices according to claim 1 and 2, it is characterized in that, on single-chip microcomputer (17), be connected with respectively 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320684431.5U CN203632219U (en) | 2013-11-02 | 2013-11-02 | Three-current-mutual-inductor control device for performing online monitoring on multipoint grounding current of transformer clamping member |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320684431.5U CN203632219U (en) | 2013-11-02 | 2013-11-02 | Three-current-mutual-inductor control device for performing online monitoring on multipoint grounding current of transformer clamping member |
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| CN203632219U true CN203632219U (en) | 2014-06-04 |
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| CN201320684431.5U Expired - Lifetime CN203632219U (en) | 2013-11-02 | 2013-11-02 | Three-current-mutual-inductor control device for performing online monitoring on multipoint grounding current of transformer clamping member |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560484A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Multipoint ground-connection current control device for three current transformers to monitor transformer clamping parts in online mode |
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2013
- 2013-11-02 CN CN201320684431.5U patent/CN203632219U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560484A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Multipoint ground-connection current control device for three current transformers to monitor transformer clamping parts in online mode |
| CN103560484B (en) * | 2013-11-02 | 2015-11-25 | 国家电网公司 | Three current transformer on-line monitoring multipoint earthing of clamping piece of transformer current control devices |
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Granted publication date: 20140604 Effective date of abandoning: 20151125 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |