CN203705077U - Temperature and grounding capacitance current online monitoring device of transformer bushing end screen - Google Patents
Temperature and grounding capacitance current online monitoring device of transformer bushing end screen Download PDFInfo
- Publication number
- CN203705077U CN203705077U CN201420072852.7U CN201420072852U CN203705077U CN 203705077 U CN203705077 U CN 203705077U CN 201420072852 U CN201420072852 U CN 201420072852U CN 203705077 U CN203705077 U CN 203705077U
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- transformer
- grounding
- temperature
- capacitance current
- current
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- 238000012806 monitoring device Methods 0.000 title abstract 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
The utility model discloses a temperature and grounding capacitance current online monitoring device of transformer bushing end screens. The temperature and grounding capacitance current online monitoring device comprises a platinum resistor, a current transformer and a computer, wherein the platinum resistor is installed inside an end screen grounding cover, the current transformer sleeves the front end of a grounding end of an end screen grounding rod, and the platinum resistor and the current transformer are respectively connected with the computer installed in a control center through a data line penetrating the side wall of the end screen grounding cover. The temperature and grounding capacitance current online monitoring device of the transformer bushing end screens can perform on-line monitoring and alarm on the temperature and grounding capacitance current of high-voltage large-capacity large transformer bushing end screens, can find out the temperature change and contrast variation of the bushing end screen grounding capacitance current and a ''scalar'' caused by poor grounding of the bushing end screen in time, can effectively prevent the occurrence of serious accidents such as damage and destroy of large transformers due to the mentioned reason, further guarantees the safe operation of the transformer, and improves the reliability of power supply.
Description
Technical field
The utility model belongs to power technology field, particularly relates to a kind of Transformer Bushing Tap temperature and earthing capacitance current on-Line Monitor Device.
Background technology
On at present conventional high-power transformer, have three side sleeve pipes, total three-phase end shield on every side sleeve pipe.Fig. 1 is a kind of high-power transformer bottom shielding of bushing structure cut-open view of prior art.As shown in Figure 1, this high-power transformer bottom shielding of bushing comprises O-ring seal 1, end shield ground rod 2, end shield rack earth 3, end shield cover ground connection lantern spring 4 and end shield base 5; Wherein end shield rack earth 3 covers the upper end, middle part of end shield base 5; End shield ground rod 2 vertically arranges, and its upper and lower part is arranged on respectively in the center pit of end shield rack earth 3 and end shield base 5; End shield cover ground connection lantern spring 4 is arranged between end shield ground rod 2 upper ends and end shield rack earth 3 center pit inside surfaces; 1 of O-ring seal is arranged on the surface of contact between end shield rack earth 3 and end shield base 5.According to statistics, in high-power transformer bottom shielding of bushing fault, end shield imperfect earth accounts for the overwhelming majority, is secondly condenser bushing built-in electrical insulation defect.Domestic existing two 500kV transformers catch fire because of end shield fault generation bushing explosion, thus the example that causes transformer to damage.
Transformer Bushing Tap imperfect earth, be equivalent to one " resistance " of earth terminal access in end shield, in the time that flowing through this " resistance ", capacitance of bushing electric current can cause the heating of end shield ground connection place, go round and begin again and cause temperature to raise gradually, thereby equivalent resistance is increased gradually, when serious, can make the fusing of bottom shielding of bushing lead-in wire, the outermost screen electric discharge over the ground of capacitance plate, make a large amount of gas of generation in sleeve pipe, in the time that in bushing, gas reaches certain pressure, sleeve pipe will be blasted, instant of detonation transformer fault phase winding exit and the electric discharge of transformer case ground connection, the electrical discharge arc transformer insulation oil that ignites, cause the burning of transforming plant primary main equipment to damage.Therefore need monitoring sleeve end shield temperature and earthing capacitance current variation constantly, to avoid the generation of above-mentioned situation, but still lack this device at present.
Summary of the invention
In order to address the above problem, the purpose of this utility model is to provide a kind of can effectively prevent that Transformer Bushing Tap temperature and the earthing capacitance current on-Line Monitor Device damaging and damage from appearring in high-power transformer.
In order to achieve the above object, the utility model provides Transformer Bushing Tap temperature and earthing capacitance current on-Line Monitor Device comprise platinum resistance, current transformer and computing machine; Wherein platinum resistance is arranged on the inside of end shield rack earth; Current transformer is enclosed within the front end of end shield ground rod earth terminal, and platinum resistance summation current transformer is connected with the computing machine that is arranged on control center by the data line that runs through end shield rack earth sidewall respectively.
Described current transformer is miniature 0.5 grade of current transformer.
Transformer Bushing Tap temperature and earthing capacitance current on-Line Monitor Device that the utility model provides can be to high voltages, jumbo high-power transformer bottom shielding of bushing temperature and earthing capacitance current carry out on-line monitoring and warning, can find in time the changes in contrast amount of temperature variation that bottom shielding of bushing causes because of imperfect earth and bottom shielding of bushing earthing capacitance current and " scalar ", can effectively prevent the generation of high-power transformer because of the above-mentioned former thereby serious accident such as damage and breaking-up that causes, the safe operation of transformer is further guaranteed, thereby improve power supply reliability.
Brief description of the drawings
Fig. 1 is a kind of high-power transformer bottom shielding of bushing structure cut-open view of prior art.
Transformer Bushing Tap temperature and earthing capacitance current on-Line Monitor Device use view that Fig. 2 provides for the utility model.
Embodiment
The Transformer Bushing Tap temperature and the earthing capacitance current on-Line Monitor Device that the utility model are provided below in conjunction with the drawings and specific embodiments are elaborated.The parts identical with prior art adopt identical drawing reference numeral, and omit the explanation that it is carried out.
As shown in Figure 2, the utility model provides Transformer Bushing Tap temperature and earthing capacitance current on-Line Monitor Device comprise platinum resistance 6, current transformer 7 and computing machine 8; Wherein platinum resistance 6 is arranged on the inside of end shield rack earth 3; Current transformer 7 is enclosed within end shield ground rod 2 upper external, and platinum resistance 6 summation current transformers 7 are connected with the computing machine 8 that is arranged on control center by the data line that runs through end shield rack earth 3 sidewalls respectively.
Described current transformer 7 is miniature 0.5 grade of current transformer.
The Transformer Bushing Tap temperature now the utility model being provided and earthing capacitance current on-Line Monitor Device using method are described below: in high-power transformer operational process, can utilize computing machine 8 to provide milliampere level measuring current also to read in real time the detected value of platinum resistance 6 to platinum resistance 6, in the time that platinum resistance 6 environment temperatures on a certain Transformer Bushing Tap change, its resistance can correspondingly change, the variation of this resistance will cause in test loop that electric current is corresponding and change, computing machine 8 can converse by the variable quantity of electric current the resistance of platinum resistance 6, according to unification of the motherland specification, the resistance of platinum resistance 6 is converted into temperature afterwards, and show on display.If 7 DEG C of these platinum resistance 6 measured temperatures and homonymy bushing temperature mutual deviations will send one-level alerting signal, prompt tone is " temperature+beep ", every prompting in 20 seconds once; When 10 DEG C of temperature mutual deviations, send secondary alerting signal, prompt tone is " temperature+too ", every prompting in 15 seconds once; When 13 DEG C of temperature mutual deviations, send three grades of alerting signals, prompt tone is " temperature+too beep ", every prompting in 10 seconds once.When warning, on the display screen of computing machine 8, will demonstrate the temperature of the each phase of this transformer three side sleeve pipe, staff can arrive by these data clear view operation and the failure condition of high-power transformer, to take appropriate measures in time simultaneously.
Meanwhile, computing machine 8 is by the earthing capacitance current detected value of real-time reading current mutual inductor 7, and this detected value and the rated capacity current value of this phase sleeve pipe of this side precomputing are compared, and by demonstrate electric capacity difference ± △ % after computing on display screen.If above-mentioned electric capacity difference exceedes setting, computing machine 8 will send alerting signal.
In addition, current transformer 7 is arranged on and in end shield rack earth 3, can avoids increasing the impact on gathering end shield earthing capacitance current because haze weather and sleeve pipe external insulation pollution seriously cause along jacket exterior Leakage Current, utilize the effect of end shield rack earth 3 ground connection that extraneous stray current is masked.
Claims (2)
1. Transformer Bushing Tap temperature and an earthing capacitance current on-Line Monitor Device, is characterized in that: it comprises platinum resistance (6), current transformer (7) and computing machine (8); Wherein platinum resistance (6) is arranged on the inside of end shield rack earth (3); Current transformer (7) is enclosed within the front end of end shield ground rod (2) earth terminal, and platinum resistance (6) summation current transformer (7) is connected with the computing machine (8) that is arranged on control center by the data line that runs through end shield rack earth (3) sidewall respectively.
2. Transformer Bushing Tap temperature according to claim 1 and earthing capacitance current on-Line Monitor Device, is characterized in that: described current transformer (7) is miniature 0.5 grade of current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420072852.7U CN203705077U (en) | 2014-02-20 | 2014-02-20 | Temperature and grounding capacitance current online monitoring device of transformer bushing end screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420072852.7U CN203705077U (en) | 2014-02-20 | 2014-02-20 | Temperature and grounding capacitance current online monitoring device of transformer bushing end screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203705077U true CN203705077U (en) | 2014-07-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420072852.7U Expired - Lifetime CN203705077U (en) | 2014-02-20 | 2014-02-20 | Temperature and grounding capacitance current online monitoring device of transformer bushing end screen |
Country Status (1)
| Country | Link |
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| CN (1) | CN203705077U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104965128A (en) * | 2015-06-29 | 2015-10-07 | 国网天津市电力公司 | Multifunctional auxiliary test tool for bushing tap grounding device |
| CN105137152A (en) * | 2015-08-21 | 2015-12-09 | 华北电力大学 | Ground lead current signal monitoring sensor for end screen of transformer bushing |
| CN105469934A (en) * | 2015-12-24 | 2016-04-06 | 江苏神马电力股份有限公司 | Tap grounding apparatus and transformer bushing with same |
| CN110208637A (en) * | 2019-06-20 | 2019-09-06 | 国网天津市电力公司电力科学研究院 | A kind of isolated on-Line Monitor Device and its method of DC bushing end shield ground connection |
| CN114167184A (en) * | 2021-12-06 | 2022-03-11 | 国网新疆电力有限公司电力科学研究院 | Sleeve and mutual inductor end screen online monitoring networking system and method based on Internet of things |
-
2014
- 2014-02-20 CN CN201420072852.7U patent/CN203705077U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104965128A (en) * | 2015-06-29 | 2015-10-07 | 国网天津市电力公司 | Multifunctional auxiliary test tool for bushing tap grounding device |
| CN104965128B (en) * | 2015-06-29 | 2017-09-15 | 国网天津市电力公司 | Bottom shielding of bushing earthing or grounding means multi-functional auxiliary testing instrument |
| CN105137152A (en) * | 2015-08-21 | 2015-12-09 | 华北电力大学 | Ground lead current signal monitoring sensor for end screen of transformer bushing |
| CN105469934A (en) * | 2015-12-24 | 2016-04-06 | 江苏神马电力股份有限公司 | Tap grounding apparatus and transformer bushing with same |
| CN105469934B (en) * | 2015-12-24 | 2018-10-02 | 江苏神马电力股份有限公司 | End shield earthing or grounding means and bushing shell for transformer with the device |
| CN110208637A (en) * | 2019-06-20 | 2019-09-06 | 国网天津市电力公司电力科学研究院 | A kind of isolated on-Line Monitor Device and its method of DC bushing end shield ground connection |
| CN110208637B (en) * | 2019-06-20 | 2021-04-20 | 国网天津市电力公司电力科学研究院 | Isolated online monitoring device and method for direct-current bushing tap grounding |
| CN114167184A (en) * | 2021-12-06 | 2022-03-11 | 国网新疆电力有限公司电力科学研究院 | Sleeve and mutual inductor end screen online monitoring networking system and method based on Internet of things |
| CN114167184B (en) * | 2021-12-06 | 2024-01-23 | 国网新疆电力有限公司电力科学研究院 | Sleeve and transformer end screen online monitoring networking system and method based on Internet of things |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140709 |
|
| CX01 | Expiry of patent term |