CN101661073A - Online monitoring method of multipoint earthing of clamping piece of transformer - Google Patents
Online monitoring method of multipoint earthing of clamping piece of transformer Download PDFInfo
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- CN101661073A CN101661073A CN200910172242A CN200910172242A CN101661073A CN 101661073 A CN101661073 A CN 101661073A CN 200910172242 A CN200910172242 A CN 200910172242A CN 200910172242 A CN200910172242 A CN 200910172242A CN 101661073 A CN101661073 A CN 101661073A
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- transformer
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- clamping piece
- adjustable resistor
- reometer
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Abstract
The invention provides an online monitoring method of multipoint earthing of a clamping piece of a transformer, which is characterized by series-connecting a device in an earthing net wire of the clamping piece. The device comprises a current transformer, an ammeter, an adjustable resistor and a full metal jacket. The ammeter is series-connected on the secondary side of the current transformer. The ammeter range has double-layer scales. The adjustable resistor is series-connected on the primary side of the ammeter. The current transformer, the ammeter and the adjustable resistor are all installed in the full metal jacket, and a window for observing the current is only reserved. A housing of the device is singly earthed. The indicated number of the ammeter is observed, and if the earthing current flowing through the clamping piece of the transformer exceeds 100mA, the adjustable resistor is adjusted to enable the current to reach the value displayed when the transformer runs normally. The invention can timely and accurately monitor the state of the clamping piece of the transformer in real time and simultaneously adjust the current-limiting resistance according to the earthing current after the clamping piece is earthed in multipoint so as to control the current flowing through the clamping piece to achieve the aim of protecting the transformer.
Description
Technical field
When the present invention relates to a kind of folder generation multipoint earthing of large-scale power transformer iron core, carry out a kind of method of on-line monitoring.
Background technology
In electric system, main-transformer is the most important equipment of electric substation's (station), also is the equipment that causes accident easily.In a single day main-transformer breaks down, and will make electric substation's (station) be forced to stop transport, and directly affects the safe and reliable operation of electric system, causes very big loss simultaneously economically.In the numerous fault types of transformer, multipoint earthing of clamping piece unshakable in one's determination is a kind of common faults, therefore, accurately diagnoses the multipoint earthing of clamping piece fault of power transformer core, and it is eliminated in bud is very important.
The folder of power transformer core comprises: the last lower yoke of secured core, punching bolt, the fixing last lower plate etc. of winding.The effect of folder: it mainly is that gravity for can the lifting of receiver body time the and transformer are when being short-circuited that iron core is clamped, winding affacts the electric power on the iron core, simultaneously can prevent that also transformer is in operation, owing to the loosening vibration noise that causes of siliconized plate.The citation form of ground connection is: last lower yoke, each punching bolt, any is serially connected them and draws to go up usefulness such as lower plate, again by grounding sleeve at the transformer external ground, all folders just are in same current potential---zero potential.According to the requirement of transformer operating standard, all folders of transformer just often need one point earth and one point earth can only be arranged, do not allow or multipoint earthing at 2, when if any folder has two or more ground connection, each point is positioned the position difference of transformer inside, will form potential difference (PD), then will form the closed-loop path between earth point, cause circulation, sometimes can be up to tens peaces (rules regulation transformer clamp earthing current just often must not surpass 100mA).This electric current can cause local overheating, earth point also can form spark discharge sometimes, causes oil decomposition, produces inflammable gas, as C2H2, H2 etc.Also may make ground lug fusing: cause the folder electric potential floating, produce discharge, puncture iron core or winding.Multipoint earthing of clamping piece is one of transformer most common failure in the transformer, and therefore, it is very necessary accurately measuring fault and in time adopting an effective measure to the transformer reliability service.
Measuring method in the past is: when suspecting that folder has multipoint earthing, the staff judges that with this folder has or not multipoint earthing with the ground current of card table survey ground wire.1), the multipoint earthing fault of folder can produce at any time the shortcoming of this method is:, can't in time find in case produce.2), the multipoint earthing point of folder is moment (period in) or intermittent sometimes, does not monitor when ground connection is taken place, earth point has disappeared again during detection.3), when measuring clamp earthing current with card table, belong to hot line job, the staff must hold the hot line job card, handles the hot line job work ticket, the more numerous rope of working routine.4), when surveying ground current with card table owing to have leakage field around the transformer of operation, the data of measuring are inaccurate.5), find multipoint earthing of clamping piece after, have a power failure and hang cover and handle, generally need 7 times on working day.Be unfavorable for safe and reliable power supply, reduced economic benefit, simultaneously time-consuming again.
Summary of the invention
The technical problem to be solved in the present invention is: the method for the current value over the ground of the uninterrupted on-line monitoring transformer of a kind of energy folder is provided, judges by the variation that flows into the grounded screen electric current whether folder has multipoint earthing.
Solving the technical scheme that its technical matters adopts is: device of series connection in folder ground connection netting twine, this device is made up of current transformer, reometer, adjustable resistor and full metal jacket, reometer is serially connected in the secondary side of current transformer, the reometer range is double-deck scale, and adjustable resistor is serially connected in the primary side of reometer; Current transformer, reometer, adjustable resistor are installed in the full metal jacket, only stay the form of observing electric current; The crust of the device independent grounding; Observe the indicated number of reometer, if when flowing through the ground current of transformer folder and surpassing 100mA, the numerical value when regulating adjustable resistor and making electric current reach transformer normally to move gets final product.
Good effect of the present invention is: adopt the method to monitor in real time the situation of transformer folder timely and accurately; simultaneously behind folder generation multipoint earthing; can regulate current-limiting resistance according to the size of ground current; with this electricity system of controlling the folder of flowing through, reach the purpose of protection transformer.
Description of drawings
Accompanying drawing is the work synoptic diagram of the transformer of employing the inventive method monitoring
Embodiment
Device of series connection in transformer 2 folder ground connection netting twines 3, this device as shown in drawings, form by current transformer 4, reometer 5, adjustable resistor 7 and full metal jacket 6, current transformer 4, current ratio is 1/1,0.5 grade of precision, reometer 5 that range is double-deck scale of secondary side serial connection of current transformer 4, the ground floor scale is 0-300mA, 0.5 grade of precision, and second layer scale is 0.3A-30A, 1.5 grades of precision, the range of reometer 5 can automatically switch, and switches and does not switch by being as the criterion with layer pilot lamp, perhaps the reometer that adopts numeral to show; Adjustable resistor 7 resistances that seal at the primary side of reometer 5 are 150 Ω--10000 Ω; When multipoint earthing took place, the ground current that flows through transformer folder 1 will surpass 100mA, manual or motorized adjustment adjustable resistor 7, and the indicated number of observation reometer 5 makes electric current reach transformer 2 normal service hours values.
The ground current value can be observed in this locality by form, and also available secondary cable bundle of lines signal is introduced the pulpit, monitors in the pulpit.The signal of regulating current-limiting resistance is introduced the pulpit with the secondary cable line, in the pulpit, use motorized adjustment.
The principle of this monitoring method is:
Transformer folder 1 is in the transformer 2 built-in electrical insulation oil, and all insulate between transformer case, iron core, winding and the built-in electrical insulation folder, just often 1 pair of vagabond current of transformer folder is no more than 100mA, capacitance current and stray electrical conduction electric current that this electric current forms shell, iron core, winding by trace impurity in insulating oil, the insulating oil and moisture etc. for all folders.Folder is in the different parts in the transformer 2 inner non-uniform electric fields, when multipoint earthing, just has potential difference (PD) between the earth point, will be significantly increased so flow into the electric current of grounded screen 8.
Claims (1)
1, a kind of multipoint earthing of clamping piece of transformer monitoring method, it is characterized in that: device of series connection in folder ground connection netting twine (3), this device is made up of current transformer (4), reometer (5), adjustable resistor (7) and full metal jacket (6), reometer (5) is serially connected in the secondary side of current transformer (4), reometer (5) range is double-deck scale, and adjustable resistor (7) is serially connected in the primary side of reometer (5); Current transformer (4), reometer (5), adjustable resistor (7) are installed in the full metal jacket (6), only stay the form of observing electric current; Full metal jacket (6) independent grounding; Observe the indicated number of reometer (5), if when flowing through the ground current of transformer folder (1) and surpassing 100mA, the numerical value when regulating adjustable resistor (7) and making electric current reach transformer normally to move gets final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910172242A CN101661073A (en) | 2009-09-23 | 2009-09-23 | Online monitoring method of multipoint earthing of clamping piece of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910172242A CN101661073A (en) | 2009-09-23 | 2009-09-23 | Online monitoring method of multipoint earthing of clamping piece of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101661073A true CN101661073A (en) | 2010-03-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910172242A Pending CN101661073A (en) | 2009-09-23 | 2009-09-23 | Online monitoring method of multipoint earthing of clamping piece of transformer |
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| CN (1) | CN101661073A (en) |
Cited By (6)
| 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 |
| CN103560485A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Method for controlling transformer clamping piece multi-point grounding currents under monitoring of double current transformers |
| CN103558449A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | On-line monitoring device of double mutual inductors of grounding current of clamp of transformer |
| TWI468705B (en) * | 2012-12-18 | 2015-01-11 | Fortune Electric Co Ltd | Transformer monitoring device |
| 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 |
| CN109541364A (en) * | 2018-09-25 | 2019-03-29 | 广西电网有限责任公司电力科学研究院 | High-power transformer multipoint earthing of clamping piece breakdown judge and method of disposal |
-
2009
- 2009-09-23 CN CN200910172242A patent/CN101661073A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI468705B (en) * | 2012-12-18 | 2015-01-11 | Fortune Electric Co Ltd | Transformer monitoring device |
| 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 |
| CN103560485A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Method for controlling transformer clamping piece multi-point grounding currents under monitoring of double current transformers |
| CN103558449A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | On-line monitoring device of double mutual inductors of grounding current of clamp of transformer |
| 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 |
| CN103558449B (en) * | 2013-11-02 | 2016-01-20 | 国家电网公司 | Two mutual inductor on-Line Monitor Device of apparatus for fixing transformer ground current |
| CN103560485B (en) * | 2013-11-02 | 2016-08-31 | 国家电网公司 | The control method of the lower multipoint earthing of clamping piece of transformer electric current of double-current transformer monitoring |
| 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 |
| CN109541364A (en) * | 2018-09-25 | 2019-03-29 | 广西电网有限责任公司电力科学研究院 | High-power transformer multipoint earthing of clamping piece breakdown judge and method of disposal |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100303 |