CN201533159U - Multi-point grounding online monitoring device of transformer iron core - Google Patents
Multi-point grounding online monitoring device of transformer iron core Download PDFInfo
- Publication number
- CN201533159U CN201533159U CN2009202236827U CN200920223682U CN201533159U CN 201533159 U CN201533159 U CN 201533159U CN 2009202236827 U CN2009202236827 U CN 2009202236827U CN 200920223682 U CN200920223682 U CN 200920223682U CN 201533159 U CN201533159 U CN 201533159U
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- iron core
- transformer
- ammeter
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Abstract
The utility model relates to a multi-point grounding online monitoring device of a transformer iron core, consisting of a current transformer, an ammeter and an adjustable resistor and being arranged in a shell; the ammeter is connected with a secondary side of the current transformer in series, and the range of the ammeter is double-layer scales; a primary side of the ammeter is connected with the adjustable resistor in series; the device is connected in an iron core grounding wire in series; and the shell of the device is separately grounded. In order to eliminate the influence of the magnetic-flux leakage and ambient electric fields and magnetic fields on measurement results, the shell of the device adopts an all-metal shell, and only a window for observing currents is reserved. The multi-point grounding online monitoring device has simple structure, convenient installation and accurate and reliable monitoring, can timely and accurately monitor the operating condition of the transformer iron core in real time, and simultaneously when the multi-point grounding of the iron core occurs, the multi-point grounding online monitoring device can properly adjust a current-limiting resistor according to the amount of the grounding current so as to control the current passing through the iron core and achieve the purpose of protecting the transformer. The device is manufactured into an integrated type, thus being practical and beautiful.
Description
Technical field
When the utility model relates to large-scale power transformer iron core generation multipoint earthing, carry out a kind of device of on-line monitoring.
Background technology
In electric power 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 power system, causes very big loss simultaneously economically.In the numerous fault types of transformer, multipoint earthing of iron core is a kind of common faults, therefore, accurately diagnoses and handle main transformer core multipoint earthing fault, and it is eliminated in bud is very important.
The citation form of main transformer core ground connection is: the silicon steel sheet formation iron core that is superimposed, insulate between every silicon steel sheet, with any all silicon steel sheets are serially connected and draw, again by grounding sleeve at the transformer external ground, whole like this iron core just is in same current potential---zero potential.According to the requirement of transformer operating standard, transformer core (comprising every silicon steel sheet) just often needs one point earth and one point earth can only be arranged, do not allow or multipoint earthing at 2, when if iron core has two or more ground connection, each point is positioned the position difference of transformer inside, will form potential difference, then will form the closed-loop path between earth point, cause circulation, sometimes can be up to tens peaces (rules regulation transformer iron core grounding current just often must not surpass 100mA).This electric current can cause local overheating, earth point also can form sparkover sometimes, causes oil decomposition, produces imflammable gas, as C2H2, H2 etc.Also may make ground strip fusing: the one, burn out iron core, the 2nd, cause the iron core electric potential floating, produce discharge, puncture winding.Multipoint earthing of iron core of transformer is one of transformer most common failure, and therefore, it is very necessary accurately measuring fault and in time adopting an effective measure to the transformer reliability service.
Method of measurement in the past is: when suspecting that iron core has multipoint earthing, the staff judges that with this iron core has or not multipoint earthing with the earth current of card table survey earth connection.1), the multipoint earthing fault of iron core can produce at any time the shortcoming of this method is:, can't in time find in case produce.2), sometimes the multipoint earthing point of iron core be between news (period in) or intermittent, when ground connection is taken place, do not monitor, and earth point detect when disconnecting less than.3), when measuring iron core grounding current with card table, belong to live line working, the staff must hold the live line working card, handles the live line working work ticket, the more numerous rope of working procedure.4), when surveying earth 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 iron core 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 purpose of this utility model is a kind of multipoint earthing of iron core of transformer on-Line Monitor Device of design, monitors in real time with the operation conditions to transformer core timely and accurately, solves the problem that prior art exists.
Realize that the technical scheme that the utility model purpose is taked is:
It is made up of current transformer, ammeter and adjustable resistor, is contained in the shell, and the ammeter string is at the secondary side of current transformer, and the range of ammeter is double-deck scale; Primary side at ammeter seals in an adjustable resistor; With device serial connection in the iron core grounding line, the crust of the device independent grounding.
For eliminate leakage field and around electricity, magnetic field to the influence of measurement result, this crust of the device full metal jacket only stays the form of observation electric current.
Good effect of the present utility model is: simple in structure, easy for installation, monitoring accurately and reliably; Can monitor in real time the operation conditions of transformer core timely and accurately, simultaneously behind iron core generation multipoint earthing, can suitably regulate current-limiting resistance according to the size of earth current, come the electricity system of control flows, reach the purpose of protection transformer through iron core with this; Device is made of one formula, not only practicality but also attractive in appearance.
Description of drawings
Accompanying drawing is the figure that installs and uses of the present utility model
Embodiment
The utility model as shown in drawings, it is made up of current transformer 3, ammeter 4 and adjustable resistor 5, is contained in the shell 6, the current ratio of current transformer 3 is 1/1,0.5 grade of precision; Ammeter 4 strings are at the secondary side of current transformer 3, the range of ammeter 4 is double-deck scale, the ground floor scale is 0-300mA, 0.5 grade of precision, second layer scale is 0.3A-30A, 1.5 grades of precision, and the range of ammeter can automatically switch, switch and do not switch by referring to that with layer lamp is as the criterion forever, perhaps ammeter adopts numeral to show; Primary side at ammeter seals in an adjustable resistor, resistance 150 Ω--10000 Ω; With device serial connection in iron core grounding line 2, crust of the device 6 independent groundings.For eliminate leakage field and around electricity, magnetic field to the influence of measurement result, this crust of the device 6 use full metal jacket, only stays the form of observation electric current.
The earth current value can be observed in this locality by form, and also available secondary cable bundle of lines signal is introduced the control room, monitors in the control room.
Can introduce the control room to the signal of regulating current-limiting resistance with the secondary cable line, in the control room, use motorized adjustment.
When iron core 1 multipoint earthing taking place, judge multipoint earthing point for after nonvolatil, manually or the resistance of motorized adjustment adjustable resistor 5, the indicated number of observation ammeter 4 makes electric current reach the normal service hours value of transformer.
Operation principle of the present utility model is: install the current value over the ground that uninterrupted on-line measurement goes out iron core 1 with this, judge by the variation that flows into ground network 7 electric currents whether iron core 1 has multipoint earthing.Iron core 1 is in the transformer built-in electrical insulation oil, and all insulate between transformer case, winding and the built-in electrical insulation folder, just often 1 pair of earth-current of iron core is no more than 100mA, and this electric current is capacitance current and the stray electrical conduction electric current that iron core 1 forms transformer case by trace impurity in insulating oil, the insulating oil and moisture etc.Iron core 1 is in the inner non-uniform electric field of transformer, when iron core 1 has multipoint earthing, just has potential difference between the earth point, and the electric current that flows into earth point will be significantly increased.According to the character of earth point,, take distinct methods to handle for intermittent or nonvolatil.
Claims (2)
1. multipoint earthing of iron core of transformer on-Line Monitor Device, it is characterized in that: it is made up of current transformer (3), ammeter (4) and adjustable resistor (5), be contained in the shell (6), ammeter (4) string is at the secondary side of current transformer (3), and the range of ammeter (4) is double-deck scale; Primary side at ammeter (4) seals in an adjustable resistor (5); Whole device serial connection in iron core grounding line (2), crust of the device (6) independent grounding.
2. multipoint earthing of iron core of transformer on-Line Monitor Device according to claim 1 is characterized in that: this crust of the device (6) is used full metal jacket, only stays the form of observing electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202236827U CN201533159U (en) | 2009-09-23 | 2009-09-23 | Multi-point grounding online monitoring device of transformer iron core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202236827U CN201533159U (en) | 2009-09-23 | 2009-09-23 | Multi-point grounding online monitoring device of transformer iron core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201533159U true CN201533159U (en) | 2010-07-21 |
Family
ID=42528559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202236827U Expired - Fee Related CN201533159U (en) | 2009-09-23 | 2009-09-23 | Multi-point grounding online monitoring device of transformer iron core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201533159U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483526A (en) * | 2014-12-04 | 2015-04-01 | 国网四川省电力公司电力科学研究院 | Grounding current induction monitor for power grid transformer |
| CN105067871A (en) * | 2015-07-16 | 2015-11-18 | 国家电网公司 | Online monitoring device for grounding current of main transformer core |
| CN107247175A (en) * | 2017-06-30 | 2017-10-13 | 国网天津市电力公司电力科学研究院 | A kind of transformer iron core grounding current live detection method for eliminating electromagnetic environmental impact |
| CN110649586A (en) * | 2019-09-27 | 2020-01-03 | 上海锐开电气有限公司 | Iron core grounding current over-current suppression resistance circuit |
-
2009
- 2009-09-23 CN CN2009202236827U patent/CN201533159U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483526A (en) * | 2014-12-04 | 2015-04-01 | 国网四川省电力公司电力科学研究院 | Grounding current induction monitor for power grid transformer |
| CN105067871A (en) * | 2015-07-16 | 2015-11-18 | 国家电网公司 | Online monitoring device for grounding current of main transformer core |
| CN107247175A (en) * | 2017-06-30 | 2017-10-13 | 国网天津市电力公司电力科学研究院 | A kind of transformer iron core grounding current live detection method for eliminating electromagnetic environmental impact |
| CN110649586A (en) * | 2019-09-27 | 2020-01-03 | 上海锐开电气有限公司 | Iron core grounding current over-current suppression resistance circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100721 Termination date: 20100923 |