CN210575468U

CN210575468U - Continuous dry type transformer winding with radial free arrangement

Info

Publication number: CN210575468U
Application number: CN201921448707.3U
Authority: CN
Inventors: 姜振军; 魏友希
Original assignee: ZHEJIANG JIANGSHAN TRANSFORMER CO LTD
Current assignee: ZHEJIANG JIANGSHAN TRANSFORMER CO LTD
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-05-19
Anticipated expiration: 2029-09-03

Abstract

The utility model relates to a transformer field provides a continuous formula dry type transformer winding of radial free arrangement, including electromagnetic wire and insulating inner tube, the electromagnetic wire is around on insulating inner tube, and the winding is electromagnetic wire along radial free arrangement, and its axial is the structure of overall continuous coiling, and the electromagnetic wire is integrative with the resin pouring for insulating inner tube. The utility model greatly improves the production efficiency and saves the material; meanwhile, the space occupancy rate of the wire in the winding is increased, the structure is simple, the winding is simple and convenient, the mechanical performance is good, the impact resistance is strong, the axial voltage gradient distribution is uniform, the inter-turn potential difference is small, the local discharge capacity is small, and the electrical performance is greatly improved.

Description

Continuous dry type transformer winding with radial free arrangement

Technical Field

The utility model relates to a transformer field, especially a dry-type transformer high voltage winding.

Background

Dry-to-variable windings generally have both segmented cylindrical and continuous winding methods.

A resin-cast dry-type transformer high-voltage coil is a multi-section cylindrical coil in the structure of a common manufacturer, and is generally divided into 4 to 12 sections according to the voltage, so that the number of turns of each layer of the coil is reduced, and the voltage between layers of the coil is reduced. When winding, each segment is equivalent to an independent multilayer cylindrical coil, and interlayer insulating materials are used for high voltage between conductor layers. As shown in fig. 1, when the segmented cylindrical structure is wound, the number of turns of the upper layer is the same as or less than that of the lower layer, when the upper layer of line segment is wound, an S-turn lifting layer needs to be formed, and then interlayer insulation is placed. The winding of the continuous winding method is as shown in fig. 2, the starting end of the continuous coil is mostly led out from the outer diameter of the wire section, and is wound into a temporary wire section, and then the temporary wire section is pushed down by hand, the wire turns are manually turned and overlapped, and finally, the formal wire section with the starting end led out from the outer diameter is formed. In addition, the transposition between sections from even number to odd number of line sections is on the outer diameter of the line section, so that all the odd number of line sections are 'inverse sections' and all the even number of line sections are positive sections, and the positive sections are the line sections which are wound at one time and do not need to turn and fold the wire turns.

The two structures are complex in winding, the labor hour is more, and the technical requirement on operators is higher. And to meet the requirements of insulation distance and electrical strength, the distance between sections or the distance between cakes needs to be increased. However, the higher the voltage, the larger the total distance, which results in the overall height of the dry-type transformer coil being increased, the volume being increased, the material consumption being increased, and the product cost being increased.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a continuous dry type transformer winding of radial free arrangement and processing method thereof, electric property is good, and is with low costs, and has advantages such as production efficiency height.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:

the utility model provides a continuous type dry transformer winding of radial free arrangement, includes magnet wire and insulating inner tube, and the magnet wire is around on the insulating inner tube, its characterized in that: the winding is a structure that the electromagnetic wires are freely arranged along the radial direction and are continuously wound in the axial direction, and the electromagnetic wires and the insulating inner cylinder are integrally cast by resin.

When the transformer is specifically implemented, the winding is provided with an upper basic section, a lower basic section and a middle voltage regulating section, the voltage regulating section extracts a tapping wire from an electromagnetic wire of the winding, the tapping wire is bound and molded by polyimide adhesive tape when being bent and led out, and then the tapping wire is sleeved into a glass fiber sleeve to reinforce insulation.

The winding which is freely arranged in the radial direction and totally continuous in the axial direction is formed by winding the electromagnetic wires from the winding starting end to the other side, because the electromagnetic wires have heights, winding turns which cannot be formed by continuously winding the electromagnetic wires in the radial direction like a pancake coil, in order to ensure the best close combination between the electromagnetic wires, the electromagnetic wires are wound and arranged with inclined slopes, then the radial positions of the winding are gradually filled, the electromagnetic wires are freely arranged in the radial direction to reach the designed radial height, because the wire distance between the electromagnetic wires arranged in the structure is very small, the axial voltage gradient is uniformly distributed, and the potential difference is very small, so that other insulating materials are not needed for isolation.

A continuous dry transformer winding freely arranged in radial direction and a processing method thereof are disclosed:

the winding former of the horizontal winding machine is arranged on a main shaft of the winding machine, an electromagnetic wire with a wire coil is arranged on a rack, an insulating inner cylinder and a left limiting baffle and a right limiting baffle with through holes are prepared, the radial dimension of the baffle of the limiting baffle is higher than the designed radial dimension of a winding, and the inner diameters of the insulating inner cylinder and the left limiting baffle and the right limiting baffle are respectively matched with the outer diameter of the winding former of the horizontal winding machine;

sleeving the insulating inner cylinder and the left and right limiting baffles into the winding former, wherein the left and right limiting baffles are respectively positioned at the left and right sides of the insulating inner cylinder, and the insulating inner cylinder and the left and right limiting baffles are fixed on the winding former;

the winding starting end of the electromagnetic wire is the left side or the right side of the insulating inner cylinder, the electromagnetic wire is wound from the winding starting end to the other side, the winding radial height of the electromagnetic wire stack is the preset radial dimension, and the electromagnetic wire is freely arranged in the radial direction;

the axial general continuous winding, the electromagnetic wire is freely stacked on the winding former to the height of the winding width direction without placing interlayer and turn-to-turn insulation,

the limiting retainer ring is provided with a laser limiter for controlling the start and stop of the winding machine, when the stacking height of the electromagnetic wire exceeds the design size, the laser limiter outputs a signal, the winding machine stops working, the winding machine adjusts the radial height of the electromagnetic wire, and then the winding machine is continuously started to work;

when the electromagnetic wire is wound, a counter of the winding machine measures the number of turns of the wound electromagnetic wire, shaping is carried out, and winding of the winding is completed.

In specific implementation, the peripheries of the left and right limiting baffle plates are respectively and correspondingly provided with adjusting grooves, and the positioning rods can penetrate through the corresponding adjusting grooves of the left and right limiting baffle plates; a servo motor is coaxially arranged on a winding machine main shaft on one side of the winding die and can drive a positioning rod to synchronously move forward along with the arrangement of the electromagnetic wires to control the radial size of the winding, the distance between the positioning rod and the insulating inner barrel is the radial height of the winding, and the positioning rod plays a role in positioning the radial height of the electromagnetic wires when the electromagnetic wires are wound.

The servo motor drives the positioning rod to move, and the servo motor has a plurality of structures in the prior art, such as gear transmission, screw rod transmission and the like. During specific implementation, the positioning rod is a worm and is connected to a main shaft of the winding machine through a supporting rod, a worm wheel matched with the worm is connected to an output shaft of the servo motor, and the servo motor works and can drive the positioning rod to move through a worm wheel and worm structure.

When the automatic electromagnetic wire arranging device is implemented, the automatic electromagnetic wire arranging device comprises a arranging rod and an arranging support, the arranging rod can move up and down on the arranging support, and the arranging rod is parallel to the winding die and arranged on the winding side; the automatic wire coil guide rail is arranged on the rack, the wire coil can move left and right on the automatic wire coil guide rail, the electromagnetic wire is sleeved with the wire releasing ring, the electromagnetic wire is positioned below the arrangement rod, and the wire releasing ring is positioned above the arrangement rod.

When the concrete implementation, the upper end and the left and right ends of the left and right limit baffles are integrally connected with convex strips, and the adjusting groove is positioned at the convex strips of the limit baffles.

When the electromagnetic wire is freely stacked on the winding die in specific implementation, the winding worker uses the electromagnetic wire knocking plate to protect the trend of the electromagnetic wire, and the knocking plate is matched with the winding size of the winding to adjust through the radial positioning effect of the positioning rod.

When the winding is provided with the tapping line, the winding is provided with an upper basic section, a lower basic section and a middle tapping section, the number of turns of the tapping position of the electromagnetic wire winding is measured through a counter of the winding machine, when the number of turns of the tapping position reaches the designed tapping number of turns of the winding, the winding of the upper basic section is completed, the electromagnetic wire is bent and led out, then the winding is continued, the number of turns of the position, needing tapping, of the electromagnetic wire winding is also measured at other tapping positions of the middle tapping section, the magnetic wire is bent and led out, and after the tapping section of the middle part is completed, the lower basic section is continuously wound. The tapping lead is bound and formed by polyimide adhesive tape when being bent and led out, and then the tapping lead is sleeved into the glass fiber sleeve to reinforce the insulation.

The wire winding initiating terminal of electromagnetic wire is the left side or the right side of insulating inner tube, and the electromagnetic wire begins to the opposite side coiling from the wire winding initiating terminal, and the locating lever is controlled by the other servo motor of mould, follows the electromagnetic wire and moves together. The radial height of the stacked windings of the electromagnetic wires is a pre-designed radial size, the electromagnetic wires are freely arranged in the radial direction, a servo motor is coaxially arranged on a winding machine main shaft beside a wire die, a positioning rod arranged on the servo motor controls the front and back directions through a worm gear and a worm, the front and back directions are synchronously moved forward along with the arrangement of the electromagnetic wires, and the radial size of the windings is controlled. The limiting retainer ring is provided with a laser limiter for controlling the winding machine to start and stop, when the stacking height of the electromagnetic wires exceeds the design size, the laser limiter outputs signals, the servo motor of the winding machine stops working, and the wire coil and the automatic electromagnetic wire distributor synchronously stop working. The axial general continuous winding is realized, the electromagnetic wire is freely stacked on a winding die to form the radial height of the winding without placing interlayer insulation, when the electromagnetic wire is wound, a counter of the winding machine measures the number of turns of the wound electromagnetic wire, when the number of turns reaches the designed number of turns of the winding, a tapping lead is drawn out, when the tapping lead is bent and led out, the tapping lead is bound and formed by polyimide adhesive tape, and then the tapping lead is sleeved into a glass fiber sleeve to be shaped, so that the winding of the winding is finished.

The utility model discloses following beneficial effect has:

1. the utility model discloses the winding structure and winding method that the scheme provided, because the workman operates less than conventional winding structure and placed the interlaminar insulation, beat S curved lift layer, trapezoidal arranging, closely technological requirement such as wire winding, the workman only need control wire coiling direction, not make the slope too big can, improved production efficiency greatly.

2. The utility model discloses the winding structure and winding method that the scheme provided, the turn-to-turn voltage after the electromagnetic wire freely arranges is less than the interlaminar voltage of traditional winding far away, and the partial discharge volume is less than traditional winding far away, has improved electrical property greatly.

3. The utility model discloses the winding structure and the winding method that the scheme provided cancel the interlayer insulation of each layer of wire, have saved the material; meanwhile, the space occupation rate of the lead in the winding is increased, the coil volume can be reduced by the same lead sectional area, and the cost is saved.

4. The utility model discloses the winding structure and winding method that the scheme provided, its simple structure, the coiling side is simple and convenient, and mechanical properties is good, and impact resistance is strong, and axial voltage gradient distributes evenly, and the interturn potential difference is little, and the partial discharge volume is little, has improved power supply quality, has increased the life of transformer.

Drawings

Fig. 1 is a schematic diagram of a prior art winding in a segmented cylindrical configuration.

Fig. 2 is a schematic diagram of a prior art continuous structure winding.

Fig. 3 is a schematic structural diagram of a winding according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of the connection after the pouring of the winding according to the embodiment of the present invention is completed.

Fig. 5 is a schematic diagram illustrating a turn principle of a winding according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of the winding according to the embodiment of the present invention.

Fig. 7 is a schematic view of a limit baffle according to an embodiment of the present invention.

In the figure: the device comprises a wire coil 1, a limiting baffle 2, a wire winding mold 3, an electromagnetic wire 4, an insulating inner cylinder 5, a positioning rod 6, a laser limiter 7, an automatic wire coil guide rail 8, an automatic electromagnetic wire arranging device 9, a servo motor 10, a winding machine main shaft 11, a wire releasing ring 12, a turbine 13, an adjusting groove 21, a convex strip 22, epoxy resin 23, a wire arranging rod 91, a wire arranging support 92, an X upper connector lug, an A lower connector lug, a basic section a and a b tapping section b.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 3-7, the embodiment of the present invention selects the dry type transformer with model SCB12-400/10-0.4, and provides a radial freely-arranged continuous dry type transformer winding, which includes electromagnetic wire 4 and insulating inner tube 5, electromagnetic wire 4 is wound on insulating inner tube 5, the upper end of the winding is the upper connector X connected with the starting end of winding electromagnetic wire 4, the lower end of the winding is the lower connector a connected with the end of winding electromagnetic wire 4, and there are upper and lower basic sections a and middle tapping section b, and tapping line is drawn out from electromagnetic wire 4 of the winding in tapping section b, and this embodiment has six tapping lines. The winding is that magnet wire 4 freely arranges along the radial, and its axial is the structure of overall continuous winding, and magnet wire 4 and insulating inner tube 5 are integrative with epoxy 23 casting.

The winding which is freely arranged in the radial direction and is totally continuous in the axial direction is characterized in that the electromagnetic wire 4 is wound from the winding starting end to the other side, the electromagnetic wire 4 has height, a winding turn like a pancake coil is not needed to be wound along the radial direction to form a positive and negative pancake, in order to ensure the best tight combination between the electromagnetic wires 4, the electromagnetic wires 4 are wound and arranged with inclined gradients, then the radial position of the winding is gradually filled, the radial direction is freely arranged, the designed radial height is achieved, the wire distance between the electromagnetic wires 4 arranged in the structure is very small, the axial voltage gradient is uniformly distributed, so that the inter-turn potential difference is small, and the isolation and the like of other insulating materials such as insulating paper are not needed.

As shown in fig. 6 and 7, in combination with fig. 3, 4 and 5, there are provided a continuous dry transformer winding with free radial arrangement and a method for manufacturing the same:

a winding former of a horizontal winding machine is arranged on a main shaft of the winding machine, an electromagnetic wire with a wire coil is arranged on a rack, an insulating inner cylinder 5 and a left limiting baffle 2 and a right limiting baffle 2 with through holes are prepared, the radial dimension of the baffle of the limiting baffle 2 is slightly larger than the designed radial dimension of a winding, and the inner diameters of the insulating inner cylinder 5 and the left limiting baffle 2 and the right limiting baffle 2 are respectively matched with the outer diameter of a winding former 3 of the horizontal winding machine; the upper end and the left and right ends of the left and right limit baffles 2 are integrally connected with convex strips 22, and the adjusting grooves 21 are positioned at the convex strips 22 of the limit baffles 2. Sleeving an insulating inner cylinder 5 and a left limiting baffle 2 and a right limiting baffle 2 into a winding former 3, wherein the left limiting baffle 2 and the right limiting baffle 2 are respectively positioned at the left side and the right side of the insulating inner cylinder 5, and the insulating inner cylinder 5 and the left limiting baffle 2 and the right limiting baffle 2 are fixed on the winding former 3; the automatic electromagnetic wire arranging device 9 comprises an arranging rod 91 and an arranging support 92, wherein the arranging rod 91 can move up and down on the arranging support 92, and the arranging rod 91 is parallel to the winding former 3 and arranged on the winding side; an automatic wire coil guide rail 8 is arranged on the rack, a wire coil 1 can move left and right on the automatic wire coil guide rail 8, a wire releasing ring 12 is sleeved on an electromagnetic wire, the electromagnetic wire is positioned below the arrangement rod, and the wire releasing ring 12 is positioned above the arrangement rod 91.

A servo motor is coaxially arranged on a winding machine main shaft on one side of the winding die, the servo motor can drive the positioning rod 6 to synchronously move forward along with the arrangement of the electromagnetic wires, the radial size of the winding is controlled, the distance between the positioning rod 6 and the insulating inner barrel is the radial height of the winding, and the positioning rod 6 plays a role in positioning the radial height of the electromagnetic wires when the electromagnetic wires are wound. The left end and the right end of the positioning rod 6 are provided with external threads.

The embodiment of the utility model provides an in, locating lever 6 is the worm, connects on the coiling machine main shaft with the bracing piece, and servo motor output shaft has the turbine 13 with worm looks adaptation, and servo motor work through the turbine worm structure, can drive the removal of locating lever 6.

The winding starting end is the left side or the right side of the insulating inner barrel 5, the upper connector lug X is drawn out from the starting end of the electromagnetic wire 4, the electromagnetic wire 4 is wound from the winding starting end to the other side, the positioning rod 6 is installed on the servo motor 10, the distance between the positioning rod 6 and the insulating inner barrel 5 is the radial height of the winding, and when the electromagnetic wire 4 is wound, the positioning rod 6 plays a role in positioning the radial height of the electromagnetic wire 4; the laser stopper 7 is installed beside the convex strip 22, and the limit height is set as the designed radial height of the winding.

Winding breadth direction height that electromagnetism line 4 piles up is predesigned breadth direction size, electromagnetism line 4 freely arranges along the radial under automatic drum guide rail 8 and the automatic electromagnetism line cooperation of arranging ware 9, the coiling is always coiled in succession to the axial, electromagnetism line 4 stacks into foretell winding breadth direction height according to the freedom on winding former 3, need not to place interlaminar insulation, pile up according to the freedom on winding former 3 as electromagnetism line 4, the winding worker protects electromagnetism line 4 trend with beating the board, through the breadth direction positioning action of locating lever 6, beat the wire winding size of board cooperation adjustment winding.

The embodiment of the utility model provides an in, when being equipped with the shunting line, basic section an and middle part's pressure regulating section b about the winding is equipped with, the number of turns of 4 coiling shunting departments of counter measurement electromagnetic wire through the coiling machine, when the number of turns of shunting department reaches the design shunting number of turns of winding, accomplish basic section a coiling, electromagnetic wire 4 bends and draws forth, with polyimide sticky tape ligature shaping, the back embolias the glass fiber sleeve pipe with the shunting lead wire, then continue the coiling, other shunting positions of the shunting section b coiling of middle part need the number of turns of the department of shunting position of 4 coiling of counter measurement electromagnetic wire through the coiling machine equally, the magnetic wire is bent and is drawn forth. After the tapping section b at the middle part is finished, the tapping joints VII and VIII with the largest number of turns are required to be drawn, the process length is reserved according to the drawing requirement after the lead is bent, the lead is interrupted from the top of the bending line and is divided into 2 independent electromagnetic wires, the tapping joints VII and VIII are separated, the leads of two disconnected leads are separately bound, the lead is bound and formed by polyimide adhesive tape, the tapping leads are then sleeved into a glass fiber sleeve, and then the two tapping leads are tightly bound by a glass fiber tape, so that the two leads have enough insulation distance. Continuing to wind the lower basic section a, simultaneously measuring the number of turns of the electromagnetic wire 4 by a counter of the winding machine, when the number of turns reaches the design number of turns of the winding, drawing out the lower connector A at the tail end, shaping, filling up the gap between the tail end of the winding and the limit baffle 2 by insulating materials, and ensuring the height consistency of the winding

After winding of the winding is completed, the laser limiter 7 is detached, the positioning rod 6 penetrates through the position of the adjusting groove 21 and is fastened by a nut, the left and right limiting baffles 2, the positioning rod 6 and the winding are integrally detached from the winding machine, and after the winding is inspected to be qualified, an outer die is mounted for epoxy resin pouring.

The utility model discloses an adopt novel radial freely arrange, the continuous winding of axial totality, the winding adopts horizontal coiling, and the wire freely piles up during the coiling, need not to press arranging of traditional structure control wires such as segmentation drum formula, continuous type. The mould and the end part limiting baffle 2 are installed by a winding worker, the radial size of the wire is only required to be controlled during winding, the height of an outer mould of the coil is not required to be exceeded, interlayer insulation is not required to be placed, S bending is not required to be performed to enable the wire to rise, and the winding mould 3 does not need to turn around to wind another half-line segment after the winding direction is wound to the other half-line segment like a traditional winding. As workers have fewer process requirements of placing interlayer insulation, punching S-shaped bent layers, arranging in a trapezoid shape, winding tightly, dropping the end of a die and the like compared with the conventional winding structure, the workers only need to control the winding direction of the lead and do not cause the gradient of the electromagnetic wire to be overlarge. The production time of each winding is saved by more than 50% compared with the conventional structure, a skilled worker can wind 8-9 windings in one day by using one high-voltage coil in 1 hour, and the traditional winding can only wind 3-4 windings in one day, so that the production efficiency is improved by more than 2 times.

The utility model discloses a structure, because its winding axial dimensions is higher, the heat radiating area increase, because radial size is less, the heat transfer performance of winding is better, the structure of transformer tends to thin and high, reduces about 3K-5K than conventional structure transformer in the aspect of the temperature rise.

Through tests and comparison, the applicant selects a transformer with the capacity of 50-1600 kVA, and compares the consumption of main raw materials of various capacity dry-type transformers manufactured according to the embodiment. The details are shown in tables 1 to 4.

Table 1: the embodiment of the utility model provides a contrast table with conventional structure winding copper line quantity

Table 2: the embodiment of the utility model provides a contrast table with conventional structure silicon steel sheet quantity

Table 3: the embodiment of the utility model provides a contrast table for resin with conventional structure

Table 4: the embodiment of the utility model provides a compare table with conventional structure transformer weight

The utility model discloses a distance between the section and the cake of traditional winding has been cancelled to the winding of transformer, and the axial height has reduced 50mm-70mm than traditional winding. The interlayer insulation is cancelled, and the radial thickness is reduced by 4-7 mm compared with the traditional sleeve set. The lead arrangement is more intensive, and space utilization is bigger, therefore the winding volume is littleer, improves the utilization ratio of iron core iron window, and the silicon steel material saves more than 3%.

The utility model discloses a transformer is owing to adopted the winding of innovation structure, the transformer in the aspect of the temperature rise superiority that possesses for the optional optimization route is more during the design. Compared with the traditional transformer, the whole volume of the novel transformer is reduced by 5-8%, the resin consumption is saved by 3-5%, the interlayer insulating material is completely saved, the total weight of the lead is saved by more than 3%, the total cost of the winding is saved by more than 5%, and the total cost of the transformer is saved by 3-6%.

The embodiment of the utility model provides a selected the model for SCB12-400/10-0.4 dry-type transformer to test, its capacity 400 kilo volt-ampere, connection group's reference numeral Dyn11, frequency 50 Hz, the phase number is 3 looks, and the test data is as follows:

the voltage ratio measurement and the connection group label verification adopt a measuring instrument which is a JYT-A transformation ratio tester. Voltage ratio measurement and link group designation verification conclusion: the absolute value of the error is not more than 0.4 percent, and the product is qualified. See table 5 for voltage ratio measurements and link group designation verification test table.

Table 5: voltage ratio measurement and connection group label verification test table

The measuring instrument adopted for measuring the winding resistance is a JYR-10 double-channel transformer direct-current resistance tester, and the environmental temperature is as follows: 8.5 ℃. And (3) measuring and concluding the winding resistance: the resistance of the high-voltage winding wire and the low-voltage winding wire is not more than 2%, if neutral points are led out, the direct current resistance of the phase wire and the direct current resistance of the wire are respectively measured, and the phase resistance is not more than 4%. And (4) passing. See table 6 for a winding resistance measurement test table.

Table 6: winding resistance measurement test table

The direct current insulation resistance between the windings and the ground is measured by adopting a measuring instrument as an insulation resistance tester XD2905, measuring is carried out one by one according to standard regulation by recording the ambient temperature and humidity, the test result is confirmed, then the next group is measured, and the applied voltage is 2500V during measurement. The coil to ground and the coil to coil DC insulation resistance measurement conclusion is qualified. In particular, see table 7 for testing dc insulation resistance measurement between windings and ground.

Table 7: winding to ground and winding DC insulation resistance measurement test table

Insulation routine (applied voltage test), conclusion: the voltage and current are stable in the test time, and no abnormal noise is generated in the transformer, so that the transformer is qualified. See table 8 for insulation routine (applied voltage withstand test) test table.

Table 8: routine insulation (applied voltage withstand test) test table

The insulation routine (induction withstand voltage test) adopts a computer measurement and control system test of an NSW-TTCS power transformer test, and the conclusion is as follows: and (4) passing. See table 9 for insulation routine (induced voltage withstand test) test table.

Table 9: routine insulation (induction withstand voltage test) test table

And (3) measuring no-load loss and no-load current, and adopting an NSW-TTCS power transformer test microcomputer measurement and control system test to draw a conclusion: and (4) passing. See table 10 for the no-load loss and no-load current measurement test table.

Table 10: no-load loss and current measuring test meter

Item	Measured value	Standard value	Design value
				No load loss (W)	762	785	767
No load current (%)	0.36	1.2+0％	0.59
				Conclusion	Qualified	Qualified	Qualified

Short-circuit impedance and load loss are measured, a computer measurement and control system test of an NSW-TTCS power transformer test is adopted, and the conclusion is as follows: applying not less than 50% rated current, and measuring its load loss and impedance voltage to be qualified. See table 11 for short-circuit impedance and load loss measurement test table.

Table 11: short-circuit impedance and load loss measurement test table

Item	Measured value	Standard value	Design value
				Load loss (W)	3821	3990	3867
Impedance voltage (%)	4.01	4.0+10％	4.15
				Conclusion	Qualified	Qualified	Qualified

And measuring partial discharge and concluding to be qualified. See table 12 for partial discharge measurement test.

Table 12: partial discharge measurement test table

The traditional dry high voltage winding generally adopts a segmented cylinder type structure, the interlayer voltage is 600V-1400V, the interlayer insulation thickness is 0.2-0.6mm, and the field intensity voltage per millimeter is more than 1500V. The partial discharge of the pool is slightly worse in the pouring process, and the partial discharge of the pool is higher than 10PC regulated by national standard. The utility model discloses the height that transformer winding's axial adopted is higher, and radial size is less, does not have the interlayer notion, and the turn-to-turn voltage after the wire freely arranges is less than the interlayer voltage of traditional winding far away, and the partial discharge volume is less than traditional winding far away. The test result shows that the partial discharge capacity of the transformer with the novel structure can be below 5pC, and the requirements on the pouring process and the operation level of workers are lower than those of the conventional dry-type transformer, so that companies can conveniently train related personnel.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a continuous type dry transformer winding of radial free arrangement, includes magnet wire and insulating inner tube, and the magnet wire is around on the insulating inner tube, its characterized in that: the winding is a structure that the electromagnetic wires are freely arranged along the radial direction and are continuously wound in the axial direction, and the electromagnetic wires and the insulating inner cylinder are integrally cast by resin.

2. A radially freely arranged continuous dry transformer winding according to claim 1, characterized in that: the winding is provided with an upper basic section, a lower basic section and a middle voltage regulating section, the voltage regulating section extracts a tapping wire from an electromagnetic wire of the winding, the tapping lead is bound and molded by polyimide adhesive tape when being bent and led out, and then the tapping lead is sleeved into a glass fiber sleeve to enhance insulation.