CN105006926A - Generator stator coil manufacturing process based on vacuum pressure impregnation technology - Google Patents

Abstract

The invention discloses a generator stator coil manufacturing process based on a vacuum pressure impregnation technology, which is characterized in that a stator coil is an insulation flat copper wire. The generator stator coil manufacturing process comprises the steps of 1, wrapping main insulation by using dry mica tapes 5442-1 and DY5446-1D at intervals in an intersecting mode; 2, wrapping a high-low resistance corona preventing belt; 3, carrying out vacuum pressure impregnation, wherein resin in vacuum pressure impregnation adopts H-level 9150 of Harbin insulation; and 4, carrying hot-press molding. According to the invention, air gaps inside an insulation system can be eliminated through the process of VPI (vacuum pressure impregnation), and the thermal conductivity of the main insulation is improved; early-stage electrical aging of the main insulation can be reduced through the process of VPI, and the durability of the insulation is improved; mechanical damages caused by vibration can be reduced through the process of VPI; and the weather resistance and the solvent resistance of the main insulation manufactured by adopting the process are enabled to be improved because of a no-gap advantage of the process of VPI. The characteristics above are fundamental factors for effectively preventing a generator from breaking down.

Description

Based on the electricity generator stator coil manufacturing process of vacuum pressure impregnation technology

Technical field

The present invention relates to technical field of hydraulic generators, particularly relate to a kind of electricity generator stator coil manufacturing process based on vacuum pressure impregnation technology.

Background technology

As everyone knows, technique of vacuum pressure for dipping electrical (VPI technology) cools after workpiece preliminary drying being removed tide, be placed in vacuum environment, get rid of air and the volatile matter of openpore coil inside, rely in vacuum and paint liquid gravity and coil capillarity, and utilize dry compressed air or inert gas, the impregnating varnish liquid removed after vacuum is applied to the effect of certain pressure, make paint liquid rapid permeability and be full of insulation system internal layer.At home, the insulating process of current VPI or the operation of a kind of gap.The drip-dry operation of workpiece is carried out in impregnating vessel, and its drying process generally another container or the baking oven established carries out, and mode has vacuumize, normal pressure standing and drying or Rotary drying.

VPI-technological process: the manufacturing process of electricity generator stator coil main insulation is generally many rubber mouldings pressure: namely main insulation resin-rich mica tape 5440-1K wrap up → again wrapping height organize corona-prevention belt → and hot-forming together with main insulation.In application aspect, VPI is more suitable for Large-scale High-Pressure coil, multilayer together around yoke coil with require higher large-scale winding and other high-tension coil.In theory, the application of VPI, the height that vacuum and pressure can do quite, certain cost is also high.

In recent years, along with the development of China's electric utility, hydraulic generator also tends to Large Copacity, high voltage gradually.Motor stator is one of important composition parts of engine, therefore, anyly designs and develops a kind of electricity generator stator coil manufacturing process based on vacuum pressure impregnation technology and seems it is particularly important.

This year, India 10MW, 11KV (VPI) hydraulic generator manufacturing contract was just accepted by my company.In current large and medium generator manufacturing industry abroad, the application of vacuum pressure impregnation technology (VPI technology) is quite ripe.And the enterprise be applied in high-rating generator manufacture of domestic VPI technology is almost very few.Development and production large capacity hydroelectric generator VPI stator coil thing must gone.We determine " 11KV level fixed subcoil insulating adopts vacuum pressure impregnation (VPI) " this problem for this reason.

Summary of the invention

The technical problem to be solved in the present invention is: provide a kind of electricity generator stator coil manufacturing process based on vacuum pressure impregnation technology; Should based on the electricity generator stator coil manufacturing process of vacuum pressure impregnation technology mainly for be the hydraulic generator of 10MW, 11KV, its fixed subcoil insulating is 11KV level.

The technical scheme that the present invention takes for the technical problem existed in solution known technology is:

Based on an electricity generator stator coil manufacturing process for vacuum pressure impregnation technology, described stator coil is insulation flat type copper wire; Comprise the steps:

Step one, main insulation low resin mica tape 5442-1 and the wrapping of DY5446-1D transpostion interval;

Step 2, wrapping height organize corona-prevention belt;

Step 3, carry out vacuum pressure impregnation; In described vacuum pressure impregnation, resin adopts and breathes out exhausted H level 9150;

Step 4, hot-forming together.

Further: described stator coil is dual-fiberglass wrapped flat copper wire.

The advantage that the present invention has and good effect are:

1, the air gap of insulation system inside can be eliminated by VPI technique, improve the thermal conductivity of main insulation;

2, the early stage voltage ageing of main insulation can be reduced by VPI technique, improve the durability of insulation;

3, the mechanical damage caused due to vibration can be reduced by VPI technique;

4, due to the seamless advantage of VPI technique, make to adopt the weatherability of the main insulation of this manufacture technics and solvent resistance to increase; These characteristics effectively prevent to cause the basic factor of generator failure above.

Accompanying drawing illustrates:

Fig. 1 is the normality dielectric loss of 11KV level stator coil in the present invention and dielectric loss increment and many glue ministry standard comparison diagram;

Fig. 2 is disruptive field intensity and many tree laces circle ministry standard comparison diagram of 11KV level stator coil in the present invention.

Embodiment

For summary of the invention of the present invention, Characteristic can be understood further, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:

Based on an electricity generator stator coil manufacturing process for vacuum pressure impregnation technology, described stator coil is insulation flat type copper wire; Comprise the steps:

Step one, main insulation low resin mica tape 5442-1 and the wrapping of DY5446-1D transpostion interval;

Step 2, wrapping height organize corona-prevention belt;

Step 3, carry out vacuum pressure impregnation; In described vacuum pressure impregnation, resin adopts and breathes out exhausted H level 9150;

Step 4, hot-forming together.

Further: when selecting the insulation system of insulation flat type copper wire, to have selected mechanical strength and the better dual-fiberglass wrapped flat copper wire of electrical strength by many ways comparing us.

Selecting of 11KV level stator coil main insulation

The design of the monolateral insulation thickness of 11KV level stator coil main insulation is about 3.3mm, and the few adhesive tape of 5442-1 and DY5446-1D adopted by the mica tape of slot armer; VPI impregnating resin adopts breathes out exhausted H level 9150.This insulation system still belongs to the first time at my company's VPI stator coil, and therefore after insulation system is selected, we repeatedly adjust VPI parameter again, and main insulation is permeated in VPI resin, thus the final electric property ensureing main insulation.

The performance study of slot armer

1, the normality dielectric loss of 11KV level stator coil and increment

As shown in Figure 1: the normality dielectric loss of PI stator coil and dielectric loss increment are all low than many rubber moulding pressure ministry standard high-class product coils, this is mainly due to the feature of VPI technique, be the air gap reduction of stator coil inside, thus especially on normality dielectric loss increment, than many rubber mouldings line ball circle, there is more outstanding advantage in the normality dielectric loss of coil.

2, the main insulation disruptive field intensity of 11KV level stator coil

As shown in Figure 2: the stator coil of our trial-production is when carrying out breakdown test, and be all that main insulation does not puncture the phenomenon that just there occurs anticorona coating and puncture, therefore stator coil is carrying out disruptive field intensity higher than ministry standard requirement.

3, the anti-corona performance of 11KV level stator coil

Our anti dizzy structure of design is that corona-prevention belt is once hot-forming with main insulation, and its anti-corona level sees the following form:

The withstand voltage test of coil substep

4, low-resistance belt is with the numerical value after main insulation solidification

Low-resistance belt selects the beautiful magnificent TJ2641-2W in Tianjin, and the low-resistance belt of this series is through VPI process, and the Standard resistance range after main insulation solidification is at 1.2 ~ 10K Ω, and this meets part resistance requirement in coil groove and is greater than the requirement that 1K Ω is less than 50K Ω.Specifically see the following form:

Low-resistance belt is in the resistance of VPI coil surface

5, conclusion

1, the puncture voltage of 11KV level VPI stator coil main insulation and field intensity all have superiority than many rubber moulding pressure main insulation;

2,11KV level VPI stator coil main insulation normality medium and increment all reach insulating Design requirement, and this illustrates that main insulation fabrication process parameters is selected is appropriate;

3, the one-time formed anti dizzy structure of 11KV level VPI stator coil, mopping structure is more in the past simple, easy to operate.Anti-corona performance surmounts the anti-corona level of many rubber mouldings pressure;

4, the bending strength of 11KV level VPI stator coil main insulation is higher than mucilage Tung-Ma system, and good rigidly, this is mainly determined by the seamless property of VPI technique main insulation.

Above embodiments of the invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.

Claims (2)

1. based on an electricity generator stator coil manufacturing process for vacuum pressure impregnation technology, it is characterized in that: described stator coil is insulation flat type copper wire; Comprise the steps:

Step one, main insulation low resin mica tape 5442-1 and the wrapping of DY5446-1D transpostion interval;

Step 2, wrapping height organize corona-prevention belt;

Step 3, carry out vacuum pressure impregnation; In described vacuum pressure impregnation, resin adopts and breathes out exhausted H level 9150;

Step 4, hot-forming together.

2. the electricity generator stator coil manufacturing process based on vacuum pressure impregnation technology according to claim 1, is characterized in that: described stator coil is dual-fiberglass wrapped flat copper wire.