CN103558450A - On-line monitoring device of three mutual inductors of grounding current of clamp of transformer - Google Patents
On-line monitoring device of three mutual inductors of grounding current of clamp of transformer Download PDFInfo
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- CN103558450A CN103558450A CN201310532322.6A CN201310532322A CN103558450A CN 103558450 A CN103558450 A CN 103558450A CN 201310532322 A CN201310532322 A CN 201310532322A CN 103558450 A CN103558450 A CN 103558450A
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Abstract
The invention discloses an on-line monitoring device of three mutual inductors of a grounding current of a clamp of a transformer. The on-line monitoring device of the three mutual inductors of the grounding current of the clamp of the transformer solves the problems that testing data deviation on the grounding current of the clamp of the transformer by the prior art is large and safe operation of the transformer is influenced. The on-line monitoring device of the three mutual inductors of the grounding current of the clamp of the transformer comprises a clamp grounding outgoing line supporting insulator (13) fixedly arranged on the outer side of the tank body of a transformer oil tank (1), one end of a clamp grounding outgoing line (8) is connected with a clamp grounding connecting sheet (4) through an outgoing line sleeve (7), the other end of the clamp grounding outgoing line (8) is connected with a grounding end (6), the clamp grounding outgoing line (8) is arranged in a coil of a first current transformer (10), the two ends of the secondary coils of the three mutual inductors are connected to the two input interfaces of an AD conversion interface circuit (14) respectively, and the output end of the AD conversion interface circuit (14) is connected with a single-chip microcomputer (16). The relative accurate grounding current monitoring value of the on-line monitoring device of the three mutual inductors of the grounding current of the clamp of the transformer provides basises for operation and maintenance personnel to take effective protection measures.
Description
Technical field
The present invention relates to a kind of monitoring device of converting equipment ground current, particularly a kind of device that clamp earthing current in transformer is monitored.
Background technology
During 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, when in the floating potential on folder and transformer, the potential difference (PD) of miscellaneous part accumulative total 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.When 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 Monitor Device is not all installed on the transformer of existing operation.The maximum of the ground current during due to apparatus for fixing transformer generation multipoint earthing and during its normal operation differs and reaches up to ten thousand times, existing monitoring device or precision can not meet requirement, otherwise monitoring range transfinites.At present, detecting the Main Means of apparatus for fixing transformer ground current has sampled by clamp on amperemeter, because near leakage field transformer is larger, magnetic field intensity is also changing at any time, cause test data deviation very large, judgement distortion to clamp earthing current, has had influence on the safe operation of transformer.
Summary of the invention
The invention provides a kind of apparatus for fixing transformer ground current three mutual inductor on-Line Monitor Device, solved prior art large and then have influence on the technical matters of transformer safe operation to the test data deviation of apparatus for fixing transformer ground current.
The present invention solves above technical matters by the following technical programs:
A kind of three mutual inductor on-Line Monitor Device of apparatus for fixing transformer ground current, comprise oil tank of transformer, in oil tank of transformer, be provided with transformer core, at the two ends of transformer core, be respectively arranged with transformer upper clamping piece and transformer lower clamping piece, 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 supporting insulator, one end of folder ground outlet links together by extension line sleeve pipe and folder grounding connection sheet, the other end and the earth terminal of folder ground outlet link together, on folder ground outlet supporting insulator, be provided with wooden supporting plate, on wooden supporting plate, be fixedly installed respectively the first current transformer, the second current transformer and the 3rd current transformer, folder ground outlet is arranged in the coil of the first current transformer, the two ends of the secondary coil of the first current transformer are connected with two input interfaces of AD conversion interface circuit respectively, the two ends of the secondary 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 coil of the 3rd current transformer are connected with other two input interfaces of AD conversion interface circuit respectively, the output terminal of AD conversion interface circuit is connected with single-chip microcomputer.
On the upper face of wooden supporting plate, be respectively arranged with the first current transformer groove is installed, the second current transformer is installed by groove and the 3rd current transformer is installed groove, at the first current transformer, install between groove and the second current transformer installation groove and be provided with the first wooden press strip rotating support shaft, on the wooden press strip back shaft of the first rotation, be movably set with the wooden press strip of the first rotation, at the first current transformer, install between groove and the 3rd current transformer installation groove and be provided with the second wooden press strip rotating support shaft, on the wooden press strip back shaft of the second rotation, be movably set with the wooden press strip of the second rotation, on the upper face of wooden supporting plate, be provided with folder ground outlet mounting groove.
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; on monitoring backstage, just can monitor online in real time the situation of change of clamp earthing current value; ground current monitor value provides foundation for O&M personnel take effective protection measure more accurately, has ensured the safe operation of transformer.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is that wooden supporting plate 12 of the present invention is at the structural representation of overlooking in direction;
Fig. 3 is the structural representation of wooden supporting plate 12 of the present invention in main apparent direction.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
A kind of three mutual inductor on-Line Monitor Device of apparatus for fixing transformer ground current, comprise oil tank of transformer 1, in oil tank of transformer 1, be provided with transformer core 2, at the two ends of transformer core 2, be respectively arranged with transformer upper clamping piece 3 and transformer lower clamping piece 5, on transformer upper clamping piece 3, be respectively arranged with coupling bolt 28 on folder grounding connection sheet 4 and arm-tie, on transformer lower clamping piece 5, be provided with coupling bolt 30 under arm-tie, on arm-tie, under coupling bolt 28 and arm-tie, between coupling bolt 30, be provided with arm-tie 29, casing outside at oil tank of transformer 1 is fixedly installed folder ground outlet supporting insulator 13, one end of folder ground outlet 8 links together by extension line sleeve pipe 7 and folder grounding connection sheet 4, the other end of folder ground outlet 8 and earth terminal 6 link together, on folder ground outlet supporting insulator 13, be provided with wooden supporting plate 12, on wooden supporting plate 12, be fixedly installed respectively the first current transformer 10, the second current transformer 9 and the 3rd current transformer 11, folder ground outlet 8 is arranged in the coil of the first current transformer 10, the two ends of the secondary coil of the first current transformer 10 are connected with two input interfaces of AD conversion interface circuit 14 respectively, the two ends of the secondary coil of the second current transformer 9 are connected with another two input interfaces of AD conversion interface circuit 14 respectively, the two ends of the secondary coil of the 3rd current transformer 11 are connected with other two input interfaces of AD conversion interface circuit 14 respectively, the output terminal of AD conversion interface circuit 14 is connected with single-chip microcomputer 16.
On the upper face of wooden supporting plate 12, be respectively arranged with the first current transformer groove 21 is installed, the second current transformer is installed by groove 20 and the 3rd current transformer is installed groove 22, at the first current transformer, install between groove 21 and the second current transformer installation groove 20 and be provided with the first wooden press strip rotating support shaft 24, on the wooden press strip back shaft 24 of the first rotation, be movably set with the wooden press strip 25 of the first rotation, at the first current transformer, install between groove 21 and the 3rd current transformer installation groove 22 and be provided with the second wooden press strip rotating support shaft 26, on the wooden press strip back shaft 26 of the second rotation, be movably set with the wooden press strip 27 of the second rotation, on the upper face of wooden supporting plate 12, be provided with folder ground outlet mounting groove 23.
On single-chip microcomputer 16, be connected with respectively LCD Current Display 15, multipoint earthing of clamping piece fault current record cell 17, multipoint earthing of clamping piece alarm 19 and background monitoring computer 18.
The object that three current transformers are set on wooden supporting plate 12 is the ground current of accurately monitoring apparatus for fixing transformer.The second current transformer 9 and the 3rd current transformer 11 are electric currents that monitoring produces due to transformer leakage field, and the first current transformer 10 is electric current sums that monitoring clamp earthing current and leakage field produce.In the prior art, the detection of having sampled to clamp earthing current with clamp on amperemeter, causing detecting the inaccurate reason of numerical value is that near the leakage field of transformer is large, leakage field is uneven distribution in transformer plane, the sample position of clamp on amperemeter is different, leakage field size is also different, moreover the value that clamp on amperemeter records also comprises the induction current that leakage field produces except clamp earthing current.The present invention applies the electric current of 2 current transformers detection leakage fields induction and asks arithmetic mean, greatly improved the accuracy that leakage field induction current detects, the electric current sum that another current transformer monitoring clamp earthing current and leakage field produce, the two difference between currents is apparatus for fixing transformer ground current, this detection mode has been eliminated the interference of leakage field, has solved on-the-spot testing current data problem bigger than normal.
Current transformer installation site is different, and Data Detection has deviation.When three current transformers are not during at a surface level, easily cause leakage field different and bring certain error to current detecting result, and have certain vibration during operation of current transformers, work long hours and also easily cause that current transformer comes off.The present invention makes three current transformers in the same plane by wooden supporting plate 12 and by rotating wooden press strip 25, has improved stability and the measuring accuracy of device.
Fault current size and time when the present invention can record folder generation multipoint earthing automatically, for O&M, personnel improve reference information.In addition, be also provided with locality and remote alarms semiotic function, make O&M personnel understand in real time failure message.When clamp earthing current is greater than 0.1A, alarm lamp is bright on the spot, and alerting signal is reached to backstage, for O&M personnel reference.
Clamp earthing current indication range of the present invention is wide, can meet the accuracy requirement of different range.The present invention adopts segmentation display algorithm by arranging of computer software programs, design different sensing ranges and adopt different accuracy in program, has solved that on-the-spot test is transfinited and the problem of display precision deficiency.In electric current maximum magnitude 100A, by different range, carry out segmentation demonstration, when ground current is less than 0.1A, display precision rank is 0.1mA; When ground current is between 0.1A to 1A time, display precision rank is 0.001A; When ground current is 1A to 100A, display precision rank is 0.01A.
Claims (3)
1. three mutual inductor on-Line Monitor Device of an apparatus for fixing transformer ground current, comprise oil tank of transformer (1), in oil tank of transformer (1), be provided with transformer core (2), at the two ends of transformer core (2), be respectively arranged with transformer upper clamping piece (3) and transformer lower clamping piece (5), it is characterized in that, on transformer upper clamping piece (3), be respectively arranged with coupling bolt (28) on folder grounding connection sheet (4) and arm-tie, on transformer lower clamping piece (5), be provided with coupling bolt under arm-tie (30), under coupling bolt on arm-tie (28) and arm-tie, between coupling bolt (30), be provided with arm-tie (29), casing outside at oil tank of transformer (1) is fixedly installed folder ground outlet supporting insulator (13), one end of folder ground outlet (8) links together by extension line sleeve pipe (7) and folder grounding connection sheet (4), the other end of folder ground outlet (8) and earth terminal (6) link together, on folder ground outlet supporting insulator (13), be provided with wooden supporting plate (12), on wooden supporting plate (12), be fixedly installed respectively the first current transformer (10), the second current transformer (9) and the 3rd current transformer (11), folder ground outlet (8) is arranged in the coil of the first current transformer (10), the two ends of the secondary coil of the first current transformer (10) are connected with two input interfaces of AD conversion interface circuit (14) respectively, the two ends of the secondary coil of the second current transformer (9) are connected with another two input interfaces of AD conversion interface circuit (14) respectively, the two ends of the secondary coil of the 3rd current transformer (11) are connected with other two input interfaces of AD conversion interface circuit (14) respectively, the output terminal of AD conversion interface circuit (14) is connected with single-chip microcomputer (16).
2. three mutual inductor on-Line Monitor Device of a kind of apparatus for fixing transformer ground current according to claim 1, it is characterized in that, on the upper face of wooden supporting plate (12), be respectively arranged with the first current transformer groove (21) is installed, the second current transformer is installed by groove (20) and the 3rd current transformer is installed groove (22), at the first current transformer, install between groove (21) and the second current transformer installation groove (20) and be provided with the first wooden press strip rotating support shaft (24), on the first wooden press strip back shaft of rotation (24), be movably set with the wooden press strip of the first rotation (25), at the first current transformer, install between groove (21) and the 3rd current transformer installation groove (22) and be provided with the second wooden press strip rotating support shaft (26), on the second wooden press strip back shaft of rotation (26), be movably set with the wooden press strip of the second rotation (27), on the upper face of wooden supporting plate (12), be provided with folder ground outlet mounting groove (23).
3. two mutual inductor on-Line Monitor Device of a kind of apparatus for fixing transformer ground current according to claim 1 and 2, it is characterized in that, on single-chip microcomputer (16), be connected with respectively LCD Current Display (15), multipoint earthing of clamping piece fault current record cell (17), multipoint earthing of clamping piece alarm (19) and background monitoring computer (18).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310532322.6A CN103558450B (en) | 2013-11-02 | 2013-11-02 | Three mutual inductor on-Line Monitor Device of apparatus for fixing transformer ground current |
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| CN201310532322.6A CN103558450B (en) | 2013-11-02 | 2013-11-02 | Three mutual inductor on-Line Monitor Device of apparatus for fixing transformer ground current |
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| CN103558450A true CN103558450A (en) | 2014-02-05 |
| CN103558450B CN103558450B (en) | 2015-11-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223457A (en) * | 2014-05-29 | 2016-01-06 | 国网山西省电力公司电力科学研究院 | The device and method that extra-high voltage reactor earth fault judges and processes, eliminates |
| CN109100643A (en) * | 2018-07-03 | 2018-12-28 | 日升集团有限公司 | A kind of intelligence electrical measurement component |
| CN113126001A (en) * | 2021-04-20 | 2021-07-16 | 广东电网有限责任公司 | Electromagnetic monitoring system and method |
Citations (5)
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|---|---|---|---|---|
| JPS5657966A (en) * | 1979-10-17 | 1981-05-20 | Sumitomo Electric Ind Ltd | Grounding method of transformer for grounding |
| 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 |
| CN102650654A (en) * | 2012-05-14 | 2012-08-29 | 云南电力试验研究院（集团）有限公司电力研究院 | Operation performance on-line assessment method for power transformer iron core and clamping piece grounding current monitoring device |
| 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 |
| CN203630206U (en) * | 2013-11-02 | 2014-06-04 | 国家电网公司 | Three-mutual-inductor online monitoring device for grounding current of transformer clamping piece |
-
2013
- 2013-11-02 CN CN201310532322.6A patent/CN103558450B/en active Active
Patent Citations (5)
| 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 |
| 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 |
| CN102650654A (en) * | 2012-05-14 | 2012-08-29 | 云南电力试验研究院（集团）有限公司电力研究院 | Operation performance on-line assessment method for power transformer iron core and clamping piece grounding current monitoring device |
| 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 |
| CN203630206U (en) * | 2013-11-02 | 2014-06-04 | 国家电网公司 | Three-mutual-inductor online monitoring device for grounding current of transformer clamping piece |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223457A (en) * | 2014-05-29 | 2016-01-06 | 国网山西省电力公司电力科学研究院 | The device and method that extra-high voltage reactor earth fault judges and processes, eliminates |
| CN109100643A (en) * | 2018-07-03 | 2018-12-28 | 日升集团有限公司 | A kind of intelligence electrical measurement component |
| CN109100643B (en) * | 2018-07-03 | 2020-06-23 | 日升集团有限公司 | Intelligent electrical measurement assembly |
| CN113126001A (en) * | 2021-04-20 | 2021-07-16 | 广东电网有限责任公司 | Electromagnetic monitoring system and method |
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| CN103558450B (en) | 2015-11-25 |
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