CN103293430B - 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 PDF

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Publication number
CN103293430B
CN103293430B CN201310166250.8A CN201310166250A CN103293430B CN 103293430 B CN103293430 B CN 103293430B CN 201310166250 A CN201310166250 A CN 201310166250A CN 103293430 B CN103293430 B CN 103293430B
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China
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iron core
iron cores
adjacent
short
step
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CN201310166250.8A
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Chinese (zh)
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CN103293430A (en
Inventor
蒋新艳
虞刚
唐军军
程维东
梁艳
肖苏媛
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南车戚墅堰机车有限公司
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Publication of CN103293430A publication Critical patent/CN103293430A/en
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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 (a) the earth tags between the iron cores and the iron core clamps are removed, (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

Short circuit failure detection method between the iron core of laminated iron core formula main-transformer

Technical field

Short circuit failure detection method between the iron core that the present invention relates to a kind of laminated iron core formula main-transformer, belongs to transformer technology field.

Background technology

At present, main transformer core iron loss is greatly the main cause causing main-transformer open circuit loss to exceed standard, and the large reason of iron loss has: 1, multipoint earthing appears in iron core, may be generally that ground lug is out of shape the siliconized plate short circuit that will stride across; 2, iron core surface is unclean; 3, siliconized plate is jagged; 4 repair in handling process, and iron core surface is clashed into; 5, iron core core through screw rod insulation, feet insulation corrupted, siliconized plate insulation between plates is aging.Because main-transformer repairing amount is few, lack experience, past is by the visual inspection to iron core, no-load test after the insulation of core through screw rod, feet, folder, ground lug etc. check and assemble finally judges that iron core has non-fault, blank to the detection of iron core insulation between plates before assembling always, although the measurement controlling after assembling to damage also can reflect iron core problem, but at this moment just pinpoint the problems, once defective, main-transformer to be disintegrated again, again overhaul, a large amount of manpower and materials will be wasted, and node is produced in impact.

Summary of the invention

Technical matters to be solved by this invention overcomes the deficiencies in the prior art, there is provided one just can detect between iron core with or without short trouble before assembling, thus 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 the method is as follows:

A) ground lug between iron core and iron core folder is removed;

B) to the logical direct current safe voltage of the outside surface in yoke portion, laminated iron core both sides;

C) the voltage drop Za between adjacent two iron cores in the milivoltmeter measurement outermost side of laminated iron core is utilized;

D) utilize milivoltmeter to measure the outermost opposite side of laminated iron core and step c) in voltage drop Zb between symmetrical adjacent two iron cores;

E) compare the size of Za and Zb, as Za=Zb, description of step c) and steps d) in measured iron core without short trouble; As voltage drop Za < Zb wherein, illustrate, between adjacent two iron cores that Za is corresponding, there is short trouble; As voltage drop Zb < Za wherein, illustrate, between adjacent two iron cores that Zb is corresponding, there is short trouble;

F) by laminated iron core from outer toward interior order, adopt step c) to step e) mode, judge the short circuit fault condition between other adjacent two iron cores, until all iron core short trouble judges complete.

Further, described step b) in, the insullac of the symmetrical position of outside surface in the yoke portion, laminated iron core both sides described in removal, form electrical power source connection, and adopt two connection conducting strips to be attached to corresponding electrical power source connection respectively, described direct current safe voltage is connected on two and connects on conducting strips.

Further, described step c) and steps d) in, the insullac on the adjacent two iron core surfaces described in removal, forms measurement section, and adopt two conductions to measure the measurement section that sheet is attached to corresponding iron core respectively, two polar curves of described milivoltmeter are connected to two conductions and measure on sheets.

After have employed technique scheme, the present invention can detect between iron core with or without short trouble before transformer assembling, avoid by the visual inspection to iron core, no-load test after the insulation of core through screw rod, feet, folder, ground lug etc. check and assemble finally judges that iron core has trouble-free numerous and diverse operation, and once find that fault can be keeped in repair at any time, do not need again main-transformer to be disintegrated again, again overhaul, thus improve product percent of pass and production efficiency, save production cost.

Accompanying drawing explanation

Fig. 1 be laminated iron core formula main-transformer of the present invention iron core between the connection diagram of short circuit failure detection method.

Embodiment

In order to make content of the present invention more easily be clearly understood, below according to specific embodiment also by reference to the accompanying drawings, the present invention is further detailed explanation,

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 the method is as follows:

A) ground lug between iron core and iron core folder is removed;

B) to the logical direct current safe voltage 2 of the outside surface 1-1 in yoke portion, laminated iron core 1 both sides;

C) milivoltmeter 3 is utilized to measure voltage drop Za between the adjacent two iron core 1-2 in the outermost side of laminated iron core 1;

D) utilize milivoltmeter 3 to measure the outermost opposite side of laminated iron core 1 and step c) in voltage drop Zb between symmetrical adjacent two iron core 1-2;

E) compare the size of Za and Zb, as Za=Zb, description of step c) and steps d) in measured iron core without short trouble; As voltage drop Za < Zb wherein, illustrate, between the adjacent two iron core 1-2 that Za is corresponding, there is short trouble; As voltage drop Zb < Za wherein, illustrate, between the adjacent two iron core 1-2 that Zb is corresponding, there is short trouble;

F) by laminated iron core 1 from outer toward interior order, adopt step c) to step e) mode, judge the short circuit fault condition between other adjacent two iron core 1-2, until all iron core 1-2 short trouble judges complete.

Step b) in, the insullac of the symmetrical position of outside surface 1-1 in the yoke portion, laminated iron core 1 both sides described in removal, form electrical power source connection, and adopt two connection conducting strips 4 to be attached to corresponding electrical power source connection respectively, described direct current safe voltage 2 is connected on two and connects on conducting strips 4.

Step c) and steps d) in, the insullac on the adjacent two iron core 1-2 surfaces described in removal, form measurement section, and adopt two conductions to measure the measurement section that sheet 5 is attached to corresponding iron core 1-2 respectively, two polar curves of described milivoltmeter 3 are connected to two conductions and measure on sheets 5.

Eight iron core 1-2 are such as had to form laminated iron core 1, No. 01 adjacent iron core in first survey sheet 1 and the voltage drop between No. 02 iron core, voltage drop between No. 07 iron core that opposite side again in survey sheet 1 is adjacent and No. 08 iron core, size relatively between these two voltage drops, thus draw, between which section adjacent iron cores, there is short trouble; Then according to the method described above, measure the voltage drop between No. 03 adjacent 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 is formed the like.

The present invention can detect between iron core 1-2 with or without short trouble before transformer assembling, avoid by the visual inspection to iron core 1-2, no-load test after the insulation of core through screw rod, feet, folder, ground lug etc. check and assemble finally judges that iron core has trouble-free numerous and diverse operation, and once find that fault can be keeped in repair at any time, do not need again main-transformer to be disintegrated again, again overhaul, thus improve product percent of pass and production efficiency, save production cost.

Direct current safe voltage 2 can be 24V.

Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. a short circuit failure detection method between the iron core of laminated iron core formula main-transformer, the step of the method is as follows:
A) ground lug between iron core and iron core folder is removed;
B) to the logical direct current safe voltage (2) of the outside surface (1-1) in yoke portion, laminated iron core (1) both sides;
C) the voltage drop Za between adjacent two iron cores (1-2) in milivoltmeter (3) measurement laminated iron core (1) outermost side is utilized;
D) utilize milivoltmeter (3) to measure laminated iron core (1) outermost opposite side and step c) in voltage drop Zb between symmetrical adjacent two iron cores (1-2);
It is characterized in that, it also comprises step:
E) compare the size of Za and Zb, as Za=Zb, description of step c) and steps d) in measured iron core without short trouble; As voltage drop Za < Zb wherein, illustrate, between adjacent two iron cores (1-2) that Za is corresponding, there is short trouble; As voltage drop Zb < Za wherein, illustrate, between adjacent two iron cores (1-2) that Zb is corresponding, there is short trouble;
F) by laminated iron core (1) from outer toward interior order, adopt step c) to step e) and mode, judge the short circuit fault condition between other adjacent two iron cores (1-2), until all iron core (1-2) short trouble judges complete.
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: described step b) in, the insullac of outside surface (1-1) the symmetrical position in the yoke portion, laminated iron core (1) both sides described in removal, form electrical power source connection, and adopt two connections conducting strip (4) to be attached to corresponding electrical power source connection respectively, described direct current safe voltage (2) is connected on two and connects on conducting strip (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: described step c) and steps d) in, the insullac on adjacent two iron cores (1-2) surface described in removal, form measurement section, and adopt two conductions to measure the measurement section that sheet (5) is attached to corresponding iron core (1-2) respectively, two polar curves of described milivoltmeter (3) are connected to two conductions and measure on sheet (5).
CN201310166250.8A 2013-05-08 2013-05-08 Method for detecting short-circuit fault occurring between iron cores of main transformer with stacked iron cores CN103293430B (en)

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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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Publication number Priority date Publication date Assignee Title
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
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

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CN102013312B (en) * 2010-11-16 2012-07-25 武汉新瑞科电气技术有限公司 Method for manufacturing transformer inductor
CN202649350U (en) * 2012-06-18 2013-01-02 湖北省电力公司电力试验研究院 Transformer with common fault simulating function

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