CN103293430A - Method for detecting short-circuit fault occurring between iron cores of main transformer with stacked iron cores - Google Patents
Method for detecting short-circuit fault occurring between iron cores of main transformer with stacked iron cores Download PDFInfo
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- CN103293430A CN103293430A CN2013101662508A CN201310166250A CN103293430A CN 103293430 A CN103293430 A CN 103293430A CN 2013101662508 A CN2013101662508 A CN 2013101662508A CN 201310166250 A CN201310166250 A CN 201310166250A CN 103293430 A CN103293430 A CN 103293430A
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Abstract
The invention discloses a method for detecting a short-circuit fault occurring between iron cores of a main transformer with stacked iron cores. The method for detecting the short-circuit fault occurring between the iron cores of the main transformer with the stacked iron cores comprises the following steps that (b) a direct-current safe voltage is connected to the outer surfaces of magnet yoke parts on the two sides of the stacked iron cores, (c) the voltage drop Za of two adjacent iron cores on one side of the outermost layer of the stacked iron cores is measured by means of a millivoltmeter, (d) the voltage drop Zb of two adjacent iron cores symmetrical with the adjacent iron cores in the step (c) and on the other side of the outermost layer of the stacked iron core is measured by means of the millivoltmeter, (e) judging whether the short-circuit fault exists between every two adjacent iron cores by comparing the Za with the Zb, (f) and judging whether a short-circuit fault exist between another two adjacent iron cores in sequence from outside to inside and from the step (c) to the step (e) in sequence until the short-circuit fault condition of all the iron cores is judged. The method for detecting the short-circuit fault occurring between the iron cores of the main transformer with the stacked iron cores has the advantages that due to the fact that whether a short-circuit fault exists between every two adjacent iron cores is judged before assembling, the percent of pass of products is improved, the production efficiency is improved, and cost is saved.
Description
Technical field
The present invention relates to short circuit failure detection method between a kind of iron core of laminated iron core formula main-transformer, belong to the transformer technology field.
Background technology
At present, the main transformer core iron loss is greatly the main cause that causes main-transformer open circuit loss to exceed standard, and the big reason of iron loss has: 1, multipoint earthing appears in iron core, generally may be that the ground lug distortion is with the siliconized plate short circuit that strides across; 2, the iron core surface is unclean; 3, siliconized plate is jagged; 4 repair in the handling process, and the iron core surface is clashed into; 5, iron core core through screw rod insulation, pad pin insulation corrupted, the siliconized plate insulation between plates is aging etc.Because main-transformer repairing amount is few, lack experience, past is by the visual inspection to iron core, inspections such as core through screw rod, pad pin insulation, folder, ground lug and assemble after no-load test come the final decision iron core that non-fault is arranged, detection to the iron core insulation between plates before assembling is a blank always, though the measurement that the control of assembling back damages also can reflect the iron core problem, but at this moment just pinpoint the problems, in case it is defective, main-transformer to be disintegrated again, maintenance will be wasted a large amount of manpower and materials again, and node is produced in influence.
Summary of the invention
Technical matters to be solved by this invention is to overcome the deficiencies in the prior art, provide a kind of before assembling, just can the detection to have or not short trouble between iron core, thereby improve product percent of pass and production efficiency, short circuit failure detection method between the iron core of cost-effective laminated iron core formula main-transformer.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: short circuit failure detection method between a kind of iron core of laminated iron core formula main-transformer, and the step of this method is as follows:
A) ground lug between dismounting iron core and iron core folder;
B) lead to a direct current safe voltage for the outside surface of laminated iron core both sides yoke portion;
C) utilize milivoltmeter to measure voltage drop Za between adjacent two iron cores of the outermost side of laminated iron core;
D) utilize milivoltmeter to measure voltage drop Zb between adjacent two iron cores symmetrical in the outermost opposite side of laminated iron core and the step c);
E) measured iron core does not have short trouble the size of Za and Zb relatively, when Za=Zb, description of step c) and in the step d); When wherein voltage drop Za＜Zb, illustrate between adjacent two iron cores of Za correspondence to have short trouble; When wherein voltage drop Zb＜Za, illustrate between adjacent two iron cores of Zb correspondence to have short trouble;
D) press laminated iron core by outer past interior order, adopt step c) to the mode of step e), judge the short trouble situation between other adjacent two iron cores, judge until whole iron core short troubles to finish.
Further, in the described step b), remove the insullac of the symmetrical position of outside surface of described laminated iron core both sides yoke portion, form the power supply connecting portion, and adopt two to connect the power supply connecting portion that conducting strip is attached to correspondence respectively, described direct current safe voltage is connected on two connects on the conducting strips.
Further, in described step c) and the step d), remove the insullac on described adjacent two iron core surfaces, form measurement section, and adopt two conductions to measure the measurement section that sheets are attached to corresponding iron core respectively, two polar curves of described milivoltmeter are connected two conductions measure on the sheets.
After having adopted technique scheme, the present invention can detect between iron core before the transformer assembling and have or not short trouble, avoided by the visual inspection to iron core, inspections such as core through screw rod, pad pin insulation, folder, ground lug and assemble after no-load test come the final decision iron core that trouble-free numerous and diverse operation is arranged, and in case find that fault can keep in repair at any time, do not need again main-transformer to be disintegrated again, again maintenance, thereby improved product percent of pass and production efficiency, saved production cost.
Description of drawings
Fig. 1 is the connection diagram of short circuit failure detection method between the iron core of laminated iron core formula main-transformer of the present invention.
Embodiment
Content of the present invention is easier to be expressly understood in order to make, and according to specific embodiment also by reference to the accompanying drawings, the present invention is further detailed explanation below,
As shown in Figure 1, short circuit failure detection method between a kind of iron core of laminated iron core formula main-transformer, the step of this method is as follows:
A) ground lug between dismounting iron core and iron core folder;
B) lead to a direct current safe voltage 2 for the outside surface 1-1 of laminated iron core 1 both sides yoke portion;
C) the voltage drop Za that utilizes milivoltmeter 3 to measure between the adjacent two iron core 1-2 of laminated iron core 1 an outermost side;
D) the voltage drop Zb that utilizes milivoltmeter 3 to measure between the adjacent two iron core 1-2 symmetrical in laminated iron core 1 outermost opposite side and the step c);
E) measured iron core does not have short trouble the size of Za and Zb relatively, when Za=Zb, description of step c) and in the step d); When wherein voltage drop Za＜Zb, illustrate between the adjacent two iron core 1-2 of Za correspondence to have short trouble; When wherein voltage drop Zb＜Za, illustrate between the adjacent two iron core 1-2 of Zb correspondence to have short trouble;
D) press laminated iron core 1 by outer past interior order, adopt step c) to the mode of step e), judge the short trouble situation between other adjacent two iron core 1-2, judge until whole iron core 1-2 short troubles to finish.
In the step b), remove the insullac of the symmetrical position of outside surface 1-1 of described laminated iron core 1 both sides yoke portion, form the power supply connecting portion, and adopt two to connect the power supply connecting portion that conducting strip 4 is attached to correspondence respectively, described direct current safe voltage 2 is connected on two connects on the conducting strips 4.
In step c) and the step d), remove the insullac on described adjacent two iron core 1-2 surfaces, form measurement section, and adopt two conductions to measure the measurement section that sheets 5 are attached to corresponding iron core 1-2 respectively, two polar curves of described milivoltmeter 3 are connected two conductions measure on the sheets 5.
For example there are eight iron core 1-2 to constitute laminated iron core 1, elder generation in the survey sheet 1 adjacent No. 01 iron core and the voltage drop between No. 02 iron core, voltage drop between No. 07 iron core that opposite side in the survey sheet 1 is adjacent and No. 08 iron core again, relatively the size between these two voltage drops has short trouble thereby draw between the adjacent iron core of which section; Then according to the method described above, measure the voltage drop between adjacent No. 03 iron core and No. 04 iron core, measure No. 05 adjacent iron core and the voltage drop of No. 06 iron core again, compare the size between these two voltage drops, the laminated iron core that the iron core of other numbers constitutes and the like.
The present invention can detect between iron core 1-2 before the transformer assembling and have or not short trouble, avoided by the visual inspection to iron core 1-2, inspections such as core through screw rod, pad pin insulation, folder, ground lug and assemble after no-load test come the final decision iron core that trouble-free numerous and diverse operation is arranged, and in case find that fault can keep in repair at any time, do not need again main-transformer to be disintegrated again, maintenance again, thus product percent of pass and production efficiency improved, saved production cost.
Direct current safe voltage 2 can be 24V.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. short circuit failure detection method between the iron core of a laminated iron core formula main-transformer is characterized in that the step of this method is as follows:
A) ground lug between dismounting iron core and iron core folder;
B) lead to a direct current safe voltage (2) for the outside surface (1-1) of laminated iron core (1) both sides yoke portion;
C) utilize milivoltmeter (3) to measure voltage drop Za between laminated iron core (1) adjacent two iron cores of an outermost side (1-2);
D) utilize milivoltmeter (3) to measure voltage drop Zb between adjacent two iron cores (1-2) symmetrical in the outermost opposite side of laminated iron core (1) and the step c);
E) measured iron core does not have short trouble the size of Za and Zb relatively, when Za=Zb, description of step c) and in the step d); When wherein voltage drop Za＜Zb, illustrate between adjacent two iron cores (1-2) of Za correspondence to have short trouble; When wherein voltage drop Zb＜Za, illustrate between adjacent two iron cores (1-2) of Zb correspondence to have short trouble;
D) press laminated iron core (1) by outer past interior order, adopt step c) to the mode of step e), judge the short trouble situation between other adjacent two iron cores (1-2), judge until whole iron cores (1-2) short trouble to finish.
2. short circuit failure detection method between the iron core of laminated iron core formula main-transformer according to claim 1, it is characterized in that: in the described step b), remove the insullac of the symmetrical position of outside surface (1-1) of described laminated iron core (1) both sides yoke portion, form the power supply connecting portion, and adopt two to connect the power supply connecting portion that conducting strip (4) is attached to correspondence respectively, described direct current safe voltage (2) is connected on two connects on the conducting strips (4).
3. short circuit failure detection method between the iron core of laminated iron core formula main-transformer according to claim 1 and 2, it is characterized in that: in described step c) and the step d), remove the insullac on described adjacent two iron cores (1-2) surface, form measurement section, and adopt two conductions to measure the measurement section that sheets (5) are attached to corresponding iron core (1-2) respectively, two polar curves of described milivoltmeter (3) are connected two conductions measure on the sheets (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310166250.8A CN103293430B (en) | 2013-05-08 | 2013-05-08 | Method for detecting short-circuit fault occurring between iron cores of main transformer with stacked iron cores |
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| CN201310166250.8A CN103293430B (en) | 2013-05-08 | 2013-05-08 | Method for detecting short-circuit fault occurring between iron cores of main transformer with stacked iron cores |
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| CN103293430B CN103293430B (en) | 2015-06-24 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199282A (en) * | 2016-08-12 | 2016-12-07 | 全球能源互联网研究院 | A kind of recognition methods of secondary stalloy distribution transformer |
| CN106771816A (en) * | 2016-12-31 | 2017-05-31 | 西南交通大学 | Core loss test platform and test method under rewinding material multipoint earth faults |
| CN106771820A (en) * | 2017-01-10 | 2017-05-31 | 华北电力大学（保定） | The synchronous generator stator monitoring method with core through screw rod short trouble unshakable in one's determination |
| CN108732450A (en) * | 2018-04-02 | 2018-11-02 | 西南交通大学 | Short-circuit detecting system and method between high-power transformer rewinding material piece |
| CN111856380A (en) * | 2020-07-27 | 2020-10-30 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Oil-immersed upright current transformer defect checking system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199282A (en) * | 2016-08-12 | 2016-12-07 | 全球能源互联网研究院 | A kind of recognition methods of secondary stalloy distribution transformer |
| CN106771816A (en) * | 2016-12-31 | 2017-05-31 | 西南交通大学 | Core loss test platform and test method under rewinding material multipoint earth faults |
| CN106771816B (en) * | 2016-12-31 | 2018-07-31 | 西南交通大学 | Core loss test platform and test method under rewinding material multipoint earth faults |
| CN106771820A (en) * | 2017-01-10 | 2017-05-31 | 华北电力大学（保定） | The synchronous generator stator monitoring method with core through screw rod short trouble unshakable in one's determination |
| CN106771820B (en) * | 2017-01-10 | 2021-02-19 | 华北电力大学（保定） | Method for monitoring short circuit fault of stator core and feed-through screw of synchronous generator |
| CN108732450A (en) * | 2018-04-02 | 2018-11-02 | 西南交通大学 | Short-circuit detecting system and method between high-power transformer rewinding material piece |
| CN108732450B (en) * | 2018-04-02 | 2019-06-04 | 西南交通大学 | Short-circuit detection method between high-power transformer rewinding material piece |
| CN111856380A (en) * | 2020-07-27 | 2020-10-30 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Oil-immersed upright current transformer defect checking system |
| CN111856380B (en) * | 2020-07-27 | 2022-04-22 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Oil-immersed upright current transformer defect checking system |
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| CN103293430B (en) | 2015-06-24 |
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