CN102707177A

CN102707177A - Transformer with common fault simulating function

Info

Publication number: CN102707177A
Application number: CN2012102003310A
Authority: CN
Inventors: 谢齐家; 阮羚; 聂德鑫; 伍志荣; 卢文华; 张海龙; 方超; 杜玮; 孙浩; 顾然
Original assignee: Wuhan NARI Ltd; Electric Power Research Institute of State Grid Hubei Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; Wuhan NARI Ltd; Electric Power Research Institute of State Grid Hubei Electric Power Co Ltd
Priority date: 2012-06-18
Filing date: 2012-06-18
Publication date: 2012-10-03
Anticipated expiration: 2032-06-18
Also published as: CN102707177B

Abstract

The invention relates to the field of transformer fault simulation, in particular to a transformer with a common fault simulating function. The transformer comprises a transformer body, wherein a silicon-steel sheet iron core is arranged in the transformer body; and a winding is wound on the silicon-steel sheet iron core. The transformer is characterized in that three iron core grounding sleeves are arranged on the top of the transformer body; three grounding lines are led to the iron core grounding sleeves from the silicon-steel sheet iron core, wherein the first grounding line and the second grounding line are led out from two adjacent silicon-steel sheets at the positions of about 25 percent of chip level; the third grounding line is led out from the silicon-steel sheet at the position of about 75 percent of the chip level; and a grounding line is led out of each of the three iron core grounding sleeves for realizing the grounding or the disconnecting externally. The transformer with the common fault simulating function has the advantages that the research on monitoring and detecting devices for the faults such as the grounding of two points of iron cores, the short circuit between iron core plates, overheating, partial discharging and the like, the research on the development process of the faults under various working conditions, and the research on fault coping strategies and the like can be carried out on the basis of a test transformer provided by the invention.

Description

A kind of transformer that possesses the most common failure analog functuion

Technical field

The present invention relates to the transformer fault simulation field, especially a kind of transformer that possesses the most common failure analog functuion.

Background technology

Transformer is one of visual plant of electric system, and along with the progressively propelling of strong intelligent grid building-up work, transformer fault diagnosis and status monitoring become the emphasis of operating maintenance work.But; Complicacy owing to transformer especially high-power transformer inner structure and failure mechanism; And the reliability of current online monitoring equipment, validity are not high, cause defective, the fault that takes place in the transformer operational process is difficult in time find and diagnosis, cause the loss of equipment and electrical network.In view of this, each Utilities Electric Co., scientific research institutions, institution of higher learning etc. have carried out a large amount of to transformer fault and the work of relevant evaluation Studies on Diagnosis.

Know according to the applicant; Mainly be on relevant analogue means, to carry out to transformer fault and the work of relevant evaluation Studies on Diagnosis at present; These devices mostly are to adopt the fault generating means to add oil-filled fuel tank to realize, completely the actual generation and the development of analogue transformer fault.

Summary of the invention

The objective of the invention is,, develop a kind of transformer that possesses the most common failure analog functuion in order to accomplish to transformer fault and relevant evaluation Studies on Diagnosis and proving test work.

The technical solution that the present invention adopts is: the transformer that possesses the most common failure analog functuion; It comprises transformer body; Be provided with silicon sheet core in the said transformer body, be wound with winding on the said silicon sheet core, its difference is: the top of said transformer body is provided with 3 iron core grounding sleeve pipes; Draw three ground wire to iron core grounding sleeve pipes from silicon sheet core; Wherein first ground wire, second ground wire are drawn from two adjacent silicon steel discs of about 25% chip level position, and the 3rd ground wire is drawn from the siliconized plate of about 75% chip level position, and three iron core grounding sleeve pipes are drawn a ground wire respectively and are used for externally being grounded or breaking off.

By above scheme, said shunting switch is a bar formula off circuit tap changer, is connected at a certain gear of shunting switch on the coupling bolt at high-voltage terminal place of said winding electric discharge device is installed; The material of said electric discharge device is for being steel, and its bottom is a right cylinder, and the top is a cone, central angle 120 degree, and the right cylinder tapping of degree bottom, internal thread size and bolt are complementary.

Inventive principle: the transformer that possesses the most common failure analog functuion is simulated overheating fault and discharge fault simultaneously through three ground wires and the electric discharge device that is placed on the shunting switch, the failure situations that the fault of simulation takes place when being the operation of emulation transformer.With the first, the 3rd ground wire externally simultaneously ground connection will simulate 2 earth faults of iron core, with first, second ground wire externally while ground connection will simulate short trouble between lamination.After installing electric discharge device, transfer to the tap gear that electric discharge device is housed, slowly boost, reach analog electrical corona behind the discharge inception voltage of electric discharge device.

Compared with prior art; Technique effect of the present invention is: with testing transformer of the present invention is support; Can carry out about the monitoring of faults such as short circuit between 2 ground connection of iron core, lamination, overheated and shelf depreciation and the research of pick-up unit; The evolution research of fault under various working, fault countermeasure research etc.

Description of drawings

Fig. 1 is a kind of transformer general structure synoptic diagram that possesses the most common failure analog functuion of the embodiment of the invention;

Fig. 2 is the transformer core ground line configuration synoptic diagram of the embodiment of the invention;

Fig. 3 is the transformer core grounding sleeve synoptic diagram of the embodiment of the invention;

Fig. 4 be the embodiment of the invention transformer electric discharge device structure and shunting switch be connected synoptic diagram;

Fig. 5 is the transformer electric discharge device structural representation of the embodiment of the invention.

Embodiment

The present invention is a kind of transformer that possesses the most common failure analog functuion, can simulate common overheated and discharge fault, realizes the emulation of transformer normal condition, various faults state, can accomplish research and proving test to the transformer most common failure.

Like Fig. 1-shown in Figure 4; A kind of transformer that possesses the most common failure analog functuion of the embodiment of the invention, it comprises transformer body 1, is provided with silicon sheet core 2 in the said transformer body 1; Be wound with winding 3 on the said silicon sheet core 2; The top of said transformer body 1 is provided with 3 iron core grounding sleeve pipes 4, draws three ground wire to iron core grounding sleeve pipes 4 from silicon sheet core 2, and wherein first ground wire 5, second ground wire 6 are drawn from two adjacent silicon steel discs of about 25% chip level position; The 3rd ground wire 7 is drawn from the siliconized plate of about 75% chip level position, and three iron core grounding sleeve pipes 4 are drawn a ground wire respectively and are used for externally being grounded or breaking off.

Concrete, as shown in Figure 4, said shunting switch 8 be a bar formula off circuit tap changer, is connected to installation electric discharge device 10 on the coupling bolt 9 at high-voltage terminal place of said winding 3 at shunting switch 8 a certain gears; The material of said electric discharge device 10 is for being steel, and its bottom is a right cylinder, and the top is a cone, central angle 120 degree, and bottom right cylinder tapping, internal thread size and bolt are complementary.

Embodiment of the present invention comprises fault simulation and correlation test.The enforcement of fault simulation comprises the enforcement of overheating fault simulation and the enforcement of discharge fault simulation.Correlation test is meant the correlative study test that the transformer that possesses transformer most common failure analog functuion that utilizes this patent invention carries out, and hereinafter has been listed the embodiment of several kinds of correlation tests.

Fault simulation

(a) overheating fault

This design of transformer two kinds of overheating faults of short circuit between multipoint earthing of iron core and lamination.

During the analogue transformer normal operating condition, with the normal ground connection of first ground wire, second, third ground wire open circuit.

During the analogue transformer multipoint earthing of iron core, with the first, the 3rd ground wire while ground connection, second ground wire open circuit.At this moment, when static exciter, there is potential difference (PD) in 2 ground connection of iron core between two earth points of iron core, and form the galvanic circle, cause circulation overheated.

Between the analogue transformer lamination during short circuit, with first, second ground wire ground connection simultaneously, the 3rd ground wire open circuit.At this moment, two adjacent silicon steel discs of iron core are ground connection simultaneously, is equivalent to two adjacent silicon steel disc short circuits, and the eddy current loss of this short circuit siliconized plate increases, and it is overheated to form.

(b) discharge fault

This design of transformer occur in the corona discharge fault of shunting switch to the lead-in wire between the winding high pressure connection.

When uneasiness was put electric installation, transformer operated to normal condition.

Choose a certain gear and to the coupling bolt at winding high-voltage terminal place, electric discharge device is installed.

Transformer tap gear is beaten to the gear that is equipped with electric discharge device, slowly boosts, and after reaching discharge inception voltage, the point electrode of electric discharge device is in non-uniform electric field, produces corona discharge.

Correlation test

(a) monitoring and pick-up unit development test

On testing transformer, install sensor additional, and build measuring system, through the simulation of overheating fault simulation and discharge fault, relevant monitoring of research and pick-up unit.As to overheating fault research top-oil temperature thermometer, the equitemperature monitoring of fiber grating distributed temperature measuring system and pick-up unit, to discharge fault research ultrasound partial discharge, HFCT, monitoring and pick-up unit are put in offices such as UHF.

(b) the inferior The Study on Fault test of bad condition

State when changing the transformer operation is realized short circuit, overload, thunderbolt, and overexcitation, bad conditions such as superpotential carry out fault genesis mechanism and the research of evolution under bad condition.Like the overheating fault of research under overload, the discharge fault under superpotential etc.

(c) Research on Fault Diagnosis Technology

Fault to the transformer simulation is carried out omnibearing monitoring, and collection can characterize the quantity of information of fault, changes the happening part of fault, factors such as the order of severity, research fault diagnosis technology.As study that short circuit diagnostic techniques between multipoint earthing of iron core fault diagnosis technology, lamination, office are put diagnostic techniques, level diagnosis technology etc. is put in office.

(d) fault countermeasure development test

After the research transformer breaks down, take which kind of measure can guarantee power grid security and device security, reduce economic loss.Through simulation test to the different countermeasures of different faults, each tactful result is carried out analysis and evaluation, work out optimum countermeasure to each fault.

Part such as the transformer body of the specific embodiment of the invention, sleeve pipe, off circuit tap changer, heat radiator is according to standard design such as GB1094.1, GB1094.2, GB1094.3, GB1094.5 and manufacturing.

Claims

1. transformer that possesses the most common failure analog functuion; It comprises transformer body; Be provided with silicon sheet core in the said transformer body, be wound with winding on the said silicon sheet core, it is characterized in that: the top of said transformer body is provided with 3 iron core grounding sleeve pipes; Draw three ground wire to iron core grounding sleeve pipes from silicon sheet core; Wherein first ground wire, second ground wire are drawn from two adjacent silicon steel discs of about 25% chip level position, and the 3rd ground wire is drawn from the siliconized plate of about 75% chip level position, and three iron core grounding sleeve pipes are drawn a ground wire respectively and are used for externally being grounded or breaking off.

2. the transformer that possesses the most common failure analog functuion as claimed in claim 1; It is characterized in that: said shunting switch is a bar formula off circuit tap changer, is connected at a certain gear of shunting switch on the coupling bolt at high-voltage terminal place of said winding electric discharge device is installed; The material of said electric discharge device is for being steel, and its bottom is a right cylinder, and the top is a cone, central angle 120 degree, and bottom right cylinder tapping, internal thread size and bolt are complementary.