CN203630208U - Double-current-transformer online monitoring transformer clamp multipoint grounding current control device - Google Patents
Double-current-transformer online monitoring transformer clamp multipoint grounding current control device Download PDFInfo
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- CN203630208U CN203630208U CN201320685298.5U CN201320685298U CN203630208U CN 203630208 U CN203630208 U CN 203630208U CN 201320685298 U CN201320685298 U CN 201320685298U CN 203630208 U CN203630208 U CN 203630208U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 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
- 230000001939 inductive effect Effects 0.000 claims description 6
- 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
- 230000006698 induction Effects 0.000 abstract 1
- 230000005684 electric field Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000000034 method 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
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 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
- 238000012423 maintenance Methods 0.000 description 1
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- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model discloses a double-current-transformer online monitoring transformer clamp multipoint grounding current control device, and a problem that the normal operation of a grid is influenced by an operation mode of carrying out power cut and current limiting on transformer clamp multipoint grounding current in the prior art is solved. A clamp grounding lead-out wire (9) passes through the coil of a first current transformer (10) and then is connected with a switching circuit input end (21). Two ends of the secondary side induction coils of two current transformers 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). A switching circuit output end (22) is connected with a grounding end (6). Bidirectional thyristors are employed by the impedance units of three switching branches as limiting current impedance units to control the connection and disconnection of the branches, through controlling a conduction angle, the connection and disconnection of an impedance branch can be controlled, and the switching of the impedance units is realized. The double-current-transformer online monitoring transformer clamp multipoint grounding current control device has strong operability and the normal and safe operation of a power grid is ensured.
Description
Technical field
The present invention relates to a kind of control device of converting equipment ground 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 (PD) accumulative total of miscellaneous part in the floating potential on folder and transformer reaches certain value, can puncture insulation therebetween, and produce spark discharge, 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 ground 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 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, solved prior art the have a power failure mode of operation of current limliting of apparatus for fixing transformer ground current is caused to the technical matters of the reliability service that affects electrical network.
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, 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 coupling bolt on folder grounding connection sheet and arm-tie, on transformer lower clamping piece, be provided with coupling bolt under arm-tie, on arm-tie, under coupling bolt and arm-tie, between coupling 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 and the second current transformer are fixedly suspended on folder ground outlet suspension insulator, between the first current transformer and the second current transformer, be provided with insulating gel, 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, between switching circuit input end and switching circuit output end, be connected with the short circuiting switch group of two thyristor compositions of reverse parallel connection, the control end of the thyristor of two reverse parallel connections of short circuiting 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 circuiting 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 also 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 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, 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 double-current mutual inductor 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, on transformer upper clamping piece 3, be respectively arranged with coupling bolt 23 on folder grounding connection sheet 4 and arm-tie, on transformer lower clamping piece 5, be provided with coupling bolt 24 under arm-tie, on arm-tie, under coupling bolt 23 and arm-tie, between coupling 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 and the second current transformer 12 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 insulating gel 11, one end of folder ground outlet 9 is fixedly connected with folder grounding connection sheet 4 through apparatus for fixing transformer extension line 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 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, between switching circuit input end 21 and switching circuit output end 22, be connected with the short circuiting switch group 26 of two thyristor compositions of reverse parallel connection, 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, after the first switching branch road is in parallel with short circuiting 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 double-current mutual inductor, a current transformer is enclosed within on folder ground lead, the electric current of surveying is except clamp earthing current Ir, the interference current Ig that also has the other factorses such as leakage field to produce, another current transformer is to detect the interference current Ig producing due to other factorses such as leakage fields.Clamp earthing current is the difference between currents that two current transformers are measured.The method has been eliminated the interference of leakage field by double-current mutual inductor, 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 conduction angle, can control group branch road logical and disconnected, realize the switching of impedance unit.Classic 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 serviceable life of switch.And employing thyristor control, cost performance is high, and afterflow ability is strong, does not occur sparking, and serviceable life is unaffected, has solved the traditional gauge tap problem in 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 processing, A/D converting unit, on LCD display unit, show.In program, adopt segmentation Presentation Function, can meet accuracy requirement, can meet again sensing 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 ground current is less than 0.1A, display precision rank reaches 0.1mA; When ground current is between 0.1A to 1A time, display precision rank is 0.001A; When ground current is between 1A to 100A time, 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), 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 coupling bolt (23) on folder grounding connection sheet (4) and arm-tie, on transformer lower clamping piece (5), be provided with coupling bolt under arm-tie (24), under coupling bolt on arm-tie (23) and arm-tie, between coupling 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) and the second current transformer (12) 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 insulating gel (11), 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), between switching circuit input end (21) and switching circuit output end (22), be connected with the short circuiting switch group (26) of two thyristor compositions of reverse parallel connection, 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, 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 circuiting switch group (26), is connected between switching circuit input end (21) and switching circuit output end (22).
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, 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 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, 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 |
|---|---|---|---|
| CN201320685298.5U CN203630208U (en) | 2013-11-02 | 2013-11-02 | Double-current-transformer online monitoring transformer clamp multipoint grounding current control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320685298.5U CN203630208U (en) | 2013-11-02 | 2013-11-02 | Double-current-transformer online monitoring transformer clamp multipoint grounding current control device |
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| CN203630208U true CN203630208U (en) | 2014-06-04 |
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| CN201320685298.5U Expired - Lifetime CN203630208U (en) | 2013-11-02 | 2013-11-02 | Double-current-transformer online monitoring transformer clamp multipoint grounding current control device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558451A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Control device of transformer clamping piece multi-point grounding currents through online monitoring of double current transformers |
| CN104316824A (en) * | 2014-11-18 | 2015-01-28 | 国家电网公司 | On-line iron core grounding current monitoring device |
-
2013
- 2013-11-02 CN CN201320685298.5U patent/CN203630208U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558451A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Control device of transformer clamping piece multi-point grounding currents through online monitoring of double current transformers |
| CN103558451B (en) * | 2013-11-02 | 2015-11-25 | 国家电网公司 | Double-current mutual inductor on-line monitoring multipoint earthing of clamping piece of transformer current control device |
| CN104316824A (en) * | 2014-11-18 | 2015-01-28 | 国家电网公司 | On-line iron core grounding current monitoring device |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
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 |