CN202649350U

CN202649350U - Transformer with common fault simulating function

Info

Publication number: CN202649350U
Application number: CN 201220285698
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: 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: 2013-01-02
Anticipated expiration: 2022-06-18

Abstract

The present utility model relates to the transformer fault simulation field, especially to a transformer with a common fault simulating function. The transformer comprises a transformer body which is provided with a silicon steel plate iron core inside, and a winding is wound on the silicon steel plate iron core. The transformer is characterized in that the top part of the transformer body is provided with three iron core grounding sleeves, three grounding wires are led out from the silicon steel plate iron core to the iron core grounding sleeve, wherein a first grounding wire and a second grounding wire are led out from two adjacent silicon steel plates of the about 25% sheet grade position, a third grounding wire is led out from a silicon steel plate of the about 75% sheet grade position, and the three iron core grounding sleeves are respectively used for leading out a grounding wire to realize grounding or breaking externally. On the basis of a test transformer, research on a monitoring and detection device of iron core two-point grounding, short circuit between iron core sheets, overheating, partial discharge and other faults can be realized, research on the developing process of the faults under a plurality of conditions can be realized, and research on fault coping strategy can be realized.

Description

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

Technical field

The utility model 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 iterative method 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 on-line monitoring equipment, validity are not high, cause defective, the fault that occurs 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 research work for transformer fault and relevant evaluation diagnosis.

According to the knowledge of the applicant, research work for transformer fault and relevant evaluation diagnosis mainly is to carry out at relevant analogue means at present, these devices mostly are to adopt the fault generating means to add oil-filled fuel tank to realize, completely actual generation and the development of analogue transformer fault.

Summary of the invention

The purpose of this utility model is in order to finish research and the proving test work to transformer fault and relevant evaluation diagnosis, to develop a kind of transformer that possesses the most common failure analog functuion.

The technical solution that the utility model adopts is: the transformer that possesses the most common failure analog functuion, it comprises transformer body, be provided with silicon sheet core in the described transformer body, be wound with winding on the described silicon sheet core, its difference is: the top of described transformer body is provided with 3 iron core grounding sleeve pipes, draw three ground wires to the iron core grounding sleeve pipe from silicon sheet core, the first ground wire wherein, the second ground wire is drawn from about two adjacent silicon steel discs of 25% chip level position, the 3rd ground wire is drawn from the about siliconized plate of 75% chip level position, and three iron core grounding sleeve pipes are drawn respectively a ground wire and are used for externally being grounded or disconnecting.

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

The utility model principle: the transformer that possesses the most common failure analog functuion is simulated overheating fault and discharge fault simultaneously by three ground wires and the electric discharge device that is placed on the shunting switch, the failure situations that the fault of simulation occurs 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 tapping gear that electric discharge device is housed, slowly boost, simulate corona discharge after reaching the discharge inception voltage of electric discharge device.

Compared with prior art, technique effect of the present utility model is: take the utility model testing transformer as support, can carry out about the monitoring of the 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 schematic diagram that possesses the most common failure analog functuion of the utility model embodiment;

Fig. 2 is the transformer core grounding line structure schematic diagram of the utility model embodiment;

Fig. 3 is the transformer core grounding sleeve pipe schematic diagram of the utility model embodiment;

Fig. 4 is the transformer electric discharge device structure of the utility model embodiment and the connection diagram of shunting switch;

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

Embodiment

The utility model 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 finish research and proving test to the transformer most common failure.

Such as Fig. 1-shown in Figure 4, a kind of transformer that possesses the most common failure analog functuion of the utility model embodiment, it comprises transformer body 1, be provided with silicon sheet core 2 in the described transformer body 1, be wound with winding 3 on the described silicon sheet core 2, the top of described transformer body 1 is provided with 3 iron core grounding sleeve pipes 4, draw three ground wires to iron core grounding sleeve pipe 4 from silicon sheet core 2, the first ground wire 5 wherein, the second ground wire 6 is drawn from about two adjacent silicon steel discs of 25% chip level position, the 3rd ground wire 7 is drawn from the about siliconized plate of 75% chip level position, and three iron core grounding sleeve pipes 4 are drawn respectively a ground wire and are used for externally being grounded or disconnecting.

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

Embodiment of the present utility model 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.The embodiment of several correlation tests has hereinafter been listed in the correlative study test that correlation test refers to utilize the transformer that possesses transformer most common failure analog functuion of this patent utility model to carry out.

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 the 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, the 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 siliconized plate 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.

The transformer tapping 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

Install sensor additional at testing transformer, and build measuring system, by the simulation of overheating fault simulation and discharge fault, the relevant monitoring of research and pick-up unit.As for overheating fault research top-oil temperature thermometer, the monitoring of fiber grating distributed temperature measuring system equitemperature and pick-up unit, for discharge fault research ultrasound partial discharge, HFCT, monitoring and pick-up unit are put in the 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, the bad conditions such as superpotential carry out fault genesis mechanism under bad condition and the research of evolution.Such as 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, the factors such as the order of severity, research fault diagnosis technology.As study short circuit diagnostic techniques between multipoint earthing of iron core fault diagnosis technology, lamination, Partial discharges diagnosis technology, partial discharge location diagnostic techniques etc.

(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.By the simulation test to the different countermeasures of different faults, each tactful result is carried out analysis and evaluation, work out the optimal strategy for each fault.

The part such as the utility model transformer body, sleeve pipe, off circuit tap changer, heat radiator is according to the 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 described transformer body, be wound with winding on the described silicon sheet core, it is characterized in that: the top of described transformer body is provided with 3 iron core grounding sleeve pipes, draw three ground wires to the iron core grounding sleeve pipe from silicon sheet core, the first ground wire wherein, the second ground wire is drawn from about two adjacent silicon steel discs of 25% chip level position, the 3rd ground wire is drawn from the about siliconized plate of 75% chip level position, and three iron core grounding sleeve pipes are drawn respectively a ground wire and are used for externally being grounded or disconnecting.

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