CN211264742U - Generator outlet dry-type voltage transformer test model - Google Patents

Abstract

The utility model discloses a generator export dry-type voltage transformer test model, including iron core, secondary coil insulation skeleton, secondary coil shielding layer, primary coil insulation skeleton, primary coil and outer insulating layer wrap up layer by layer from inside to outside taking the iron core as the center axis in proper order, primary coil includes a plurality of layers of coils, primary coil still includes high-pressure tail end inter-layer tapping, high-pressure tail end inter-turn tapping, high-pressure middle part inter-layer tapping, high-pressure middle part inter-turn tapping, high-pressure head end inter-layer tapping and high-pressure head end inter-turn tapping; the utility model has the advantages that: the method is used for measuring the change rule of the overall parameters of the dry-type voltage transformer and providing theoretical support for the research of fault diagnosis and insulation detection methods.

Description

Generator outlet dry-type voltage transformer test model

Technical Field

The utility model relates to a generator export PT indulges insulating fault diagnosis field, more specifically relates to a generator export dry-type voltage transformer test model.

Background

Because of the advantages of simple structure, convenient maintenance, reasonable price and the like, the dry type voltage transformer (hereinafter referred to as PT) is widely applied to various power generation enterprises and power systems, for example, three groups of PTs are generally installed at each machine at the motor outlet of a power plant, and respectively provide generator voltage signals for a generator transformer bank protection, an excitation regulator, a telemechanical and metering device which are configured in a dual mode. Influenced by factors such as design level, pouring process, wire rod quality and operating environment, the abnormal shutdown event of the unit caused by the insulation fault inside the PT outlet of the generator is caused in China in recent years. According to incomplete statistics, in 2010-2018, more than 30 PT primary winding insulation faults occur in 12 parts of Guangdong, Guizhou, Anhui, Shaanxi, Liaoning, Jilin, inner Mongolia and the like, and the safe production and economic benefits of electric power of various power generation enterprises are seriously influenced. Therefore, insulation diagnosis and detection of PT should be enhanced and defects should be eliminated in time after handover and commissioning, so as to ensure safe and stable operation of the power grid.

Literature investigation shows that the PT fault of the graded insulation structure is relatively large, and the fault point is located at the position of the middle lower part of the primary coil close to the inner layer. At present, the detection means of PT turn-to-turn or interlayer insulation at the outlet of the generator mainly comprises direct current resistance measurement, no-load current measurement, lightning impulse withstand voltage, triple frequency induction withstand voltage, partial discharge measurement and the like. The direct current resistance and the no-load current are more suitable for diagnosis after a fault, and the detection of the early insulation defect is not sensitive enough; the lightning impulse withstand voltage belongs to destructive tests, is only carried out before delivery, is influenced by the distributed capacitance among turns and layers of a primary winding and the capacitance to ground, and has no obvious effect on detecting the defects of an inner-layer coil close to an iron core; although the equivalent impedance of the tested coil is increased by increasing the frequency in the frequency tripled withstand voltage test, the test equipment still outputs larger current when certain voltage is applied, and practical experience shows that the defect detection rate of the method is lower; partial discharge measurement is an effective means for PT defect detection, but has strict requirements on electromagnetic environment and is inconvenient to develop on site, and the method has certain omission factor on coils at low potential, such as: the A end and the N end of the full-insulated PT with defects are respectively grounded, so that the measured partial quantities have obvious differences. Aiming at the defects of the test method in the field PT insulation detection, a new test method which is convenient for effectively checking the insulation on the field needs to be researched.

The related research of the turn-to-turn insulation detection of the dry-type air-core reactor and the insulation detection of the formed coil of the stator of the alternating current motor by using the exponential decay oscillation voltage method is mature, and high-reliability equipment is developed and well popularized and applied. Compared with the traditional method, the method for carrying out insulation detection on the PT at the outlet of the generator by using the exponentially decaying oscillating voltage has the advantages of good detection effect, simplicity in operation, strong environmental adaptability and the like. However, compared with a dry-type hollow shunt reactor, the generator outlet PT has certain differences, such as larger direct-current resistance of a coil, larger reactance value, larger stray capacitance to the ground and interlayer capacitance. Related procedures of a dry-type air reactor turn-to-turn insulation exponential ringing test cannot be carried, and research needs to be carried out aiming at the characteristics of a generator outlet PT structure and parameters. If insulation faults occur at different positions, the external parameter change rule of PT; the exponential-decay oscillation voltage of a certain frequency can be uniformly distributed on the winding of the PT at the outlet of the generator, so that the same examination strength of inter-turn insulation and interlayer insulation at different positions of the winding is ensured, and research contents such as inter-turn insulation faults are effectively detected. Therefore, a primary coil fault simulation and voltage distribution characteristic test model of the dry-type voltage transformer is designed, and is necessary to research a new method for PT insulation inspection of a generator outlet.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem how to provide a generator export dry-type voltage transformer test model to measure the change condition of PT overall parameter.

The utility model discloses a following technical means realizes solving above-mentioned technical problem: the coil comprises an iron core, a secondary coil insulation framework, a secondary coil shielding layer, a primary coil insulation framework, a primary coil and an outer insulation layer, wherein the secondary coil insulation framework, the secondary coil shielding layer, the primary coil insulation framework, the primary coil and the outer insulation layer are sequentially wrapped layer by layer from inside to outside by taking the iron core as a central shaft, the primary coil comprises a plurality of layers of coils, and the head end of each layer of coil is connected with the tail end of the next layer of coil on the layer;

the primary coil further comprises a high-voltage tail end interlayer tap, a high-voltage tail end turn-to-turn tap, a high-voltage middle layer interlayer tap, a high-voltage middle turn-to-turn tap, a high-voltage head end interlayer tap and a high-voltage head end turn-to-turn tap, wherein the high-voltage tail end interlayer tap and the high-voltage tail end turn-to-turn tap are respectively located at two end portions of the bottom layer of the primary coil, the high-voltage middle layer interlayer tap and the high-voltage middle turn-to-turn tap are respectively located at two end portions of the upper layer of the primary coil, and the high-voltage head end interlayer tap and the high-voltage head end turn-to.

The method comprises the steps that a generator outlet dry-type voltage transformer test model is used as a sample to detect the overall parameter change rule of the high-voltage head end, the high-voltage middle part and the high-voltage tail end of a fault dry-type voltage transformer, theoretical support is provided for the research of a fault diagnosis and insulation detection method, during the test, after the same group of taps are in short circuit, the short-circuit fault is simulated, and the faults at six positions can be simulated; measurement signals are led out from two taps in the same group, the distribution condition of the applied voltage in the primary coil can be measured, and theoretical support is provided for the research of the insulation detection method.

Preferably, the iron core is a rectangular structure formed by connecting four cylindrical core bodies end to end, and a secondary coil insulation framework is wound at the center of one long edge of the iron core.

Preferably, the secondary coil insulation framework is highland barley paper, an electrical tape and capacitor paper wound on the iron core layer by layer from inside to outside, and the secondary coil insulation framework is a cylindrical frame body.

Preferably, the secondary coil is a plurality of layers of enameled wires wound on the secondary coil insulation framework, and a layer of capacitor paper is wound outside each layer of enameled wire.

Preferably, the secondary coil shielding layer is capacitor paper, a paper board, an electrical tape, a conductive self-adhesive tape and a semi-conductive crepe paper wound on the secondary coil layer by layer from inside to outside.

Preferably, the primary coil insulation framework is made of capacitor paper and paperboard wound on the secondary coil shielding layer by layer from inside to outside.

Preferably, the primary coil is a plurality of layers of enameled wires wound on the primary coil insulation framework, and a layer of capacitor paper is wound outside each layer of enameled wire.

Preferably, the primary coil has n layers of enameled wires, n is an even number, the 1 st layer of enameled wire and the 2 nd layer of enameled wire are the bottom layer of the primary coil, and the first layer of enameled wire and the second layer of enameled wire are the bottom layer of the primary coil

Layer-coated wire and second

The layer enameled wire is a middle layer of the primary coil, and the n-1 th layer enameled wire and the nth layer enameled wire are an upper layer of the primary coil.

The utility model has the advantages that: the method comprises the steps that a generator outlet dry-type voltage transformer test model is used as a sample to detect the overall parameter change rule of the high-voltage head end, the high-voltage middle part and the high-voltage tail end of a fault dry-type voltage transformer, theoretical support is provided for the research of a fault diagnosis and insulation detection method, during the test, after the same group of taps are in short circuit, the short-circuit fault is simulated, and the faults at six positions can be simulated; measurement signals are led out from two taps in the same group, the distribution condition of the applied voltage in the primary coil can be measured, and theoretical support is provided for the research of the insulation detection method. The problem of prior art lack reliable experimental model of testing primary coil fault simulation and voltage distribution characteristic of generator export dry-type voltage transformer is solved, promote the research of generator export PT insulation inspection.

Drawings

Fig. 1 is a front view of a generator outlet dry-type voltage transformer test model according to an embodiment of the present invention;

fig. 2 is a top view of a generator outlet dry-type voltage transformer test model according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a winding method of a primary coil of a generator outlet dry-type voltage transformer test model according to an embodiment of the present invention;

fig. 4 is a top view of a tapping process of a primary coil in a generator outlet dry-type voltage transformer test model according to an embodiment of the present invention;

fig. 5 is a sectional view of a tapping process of a primary coil in a generator outlet dry-type voltage transformer test model according to an embodiment of the present invention.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are 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 efforts belong to the protection scope of the present invention.

As shown in fig. 1 and 2, a generator outlet dry-type voltage transformer test model comprises an iron core 8, a secondary coil insulation framework 9, a secondary coil 10, a secondary coil shielding layer 11, a primary coil 13 insulation framework 12, a primary coil 13 and an outer insulation layer 7.

Iron core 8 is the rectangle structure of four cylinder core end to end connection formation, puts winding secondary coil insulation skeleton 9 at the central point on a long limit of iron core 8, the embodiment of the utility model provides an in, the diameter of cylinder core is 85 mm.

Secondary coil insulation skeleton 9 is by interior and outer successive layer winding highland barley paper, electrician's sticky tape and condenser paper on iron core 8, and secondary coil insulation skeleton 9 is the cylinder support body, in the embodiment of the utility model provides an, the section of thick bamboo height 165mm of cylinder support body, external diameter 88 mm.

The secondary coil 10 is a plurality of layers of enameled wires wound on the secondary coil insulation framework 9, and a layer of capacitor paper is wound outside each layer of enameled wire. The enameled wire is selected from the same materials and the same models of generator outlet dry-type voltage transformers to be researched. In the embodiment of the present invention, the secondary coil 10 has 188 total turns and 135mm total width of the flat cable.

The secondary coil shielding layer 11 is made of capacitor paper, paper board, electrical tape, conductive self-adhesive tape and semiconductive crepe paper wound on the secondary coil 10 layer by layer from inside to outside. The embodiment of the utility model provides an in, secondary coil shielding layer 11 is wide 165mm, external diameter 110 mm.

Primary coil 13 insulating skeleton 12 is for from inside to outside successive layer winding condenser paper and cardboard on secondary coil shielding layer 11, in the embodiment of the utility model provides an, the external diameter 111mm of primary coil 13 insulating skeleton 12.

The primary coil 13 is n layers of enameled wires wound on the insulating framework 12 of the primary coil 13, and a layer of capacitor paper is wound outside each layer of enameled wire. The enameled wire is selected from the same materials and the same models of generator outlet dry-type voltage transformers to be researched. The outer insulating layer 7 is a plurality of layers of capacitor paper wound layer by layer outside the primary coil 13. In the embodiment of the utility model provides an in, 16500 circle, 50 layers altogether of primary coil 13, every layer of 330 circles, every layer is on average divided into the three-section, total winding displacement width 114 mm. The primary coil 13 has n layers of enameled wires in total, wherein n is an even number, the 1 st layer of enameled wire and the 2 nd layer of enameled wire are the bottom layer of the primary coil 13, and the first layer of enameled wire and the second layer of enameled wire are the bottom layer of the primary coil 13

Layer-coated wire and second

The layer enameled wire is a middle layer of the primary coil 13, and the n-1 th layer enameled wire and the nth layer enameled wire are upper layers of the primary coil 13. The head end of the current layer coil of the primary coil 13 is connected to the tail end of the next layer coil of the current layer, and taking the number of turns of each layer as an example, the winding schematic diagrams between layers and between turns of the primary coil are shown in fig. 3. The primary coil 13 further comprises a high-voltage tail end inter-layer tap 1, a high-voltage tail end inter-turn tap 2, a high-voltage middle inter-layer tap 3, a high-voltage middle inter-turn tap 4, a high-voltage head end inter-layer tap 5 and a high-voltage head end inter-turn tap 6The high-voltage tail end interlayer tap 1 and the high-voltage tail end turn-to-turn tap 2 are respectively positioned at two end parts of the bottom layer of the primary coil 13, the high-voltage middle layer tap 3 and the high-voltage middle turn-to-turn tap 4 are positioned at two end parts of the middle layer of the primary coil 13, and the high-voltage head end interlayer tap 5 and the high-voltage head end turn-to-turn tap 6 are positioned at two end parts of the upper layer of the primary coil.

Combine fig. 4 and fig. 5, the utility model provides a generator export dry-type voltage transformer test model's manufacturing method still, this method will introduce the manufacturing process of model in detail, primary coil 13 take a percentage the mode and draw a percentage 1, high-pressure tail end interturn take a percentage 2, take a percentage 3, high-pressure middle part interturn take a percentage 4, take a percentage 5 and take a percentage 6 concrete forming process between high-pressure head end interturn between the high-pressure middle part layer between the high-pressure tail end layer. The method comprises the following steps: selecting an iron core 8 made of the same material as a dry voltage transformer at the outlet of a generator to be researched, wherein the iron core 8 is of a rectangular structure formed by connecting four cylindrical core bodies end to end, highland barley paper, an electrical adhesive tape and capacitor paper are wound on the center position of one long side of the iron core 8 layer by layer from inside to outside to form a secondary coil insulating framework 9, a plurality of layers of enameled wires are wound on the secondary coil insulating framework 9, a layer of capacitor paper is wound outside each layer of enameled wire to form a secondary coil 10, a layer of capacitor paper, a paperboard, an electrical adhesive tape, a conductive self-adhesive tape and a semi-conductive crepe paper are wound outside the secondary coil 10 layer by layer from inside to outside to form a secondary coil shielding layer 11, a layer of capacitor paper and a paperboard are wound outside the secondary coil shielding layer 11 layer by layer to form a primary coil 13 insulating framework 12, a plurality of enameled wires are wound on the primary coil 13 insulating framework 12 layer by layer, and a, several layers of capacitor paper are wound outside the primary coil 13 to form the outer insulating layer 7.

The primary coil 13 has n layers of enameled wires in total, wherein n is a positive even number, the 1 st layer of enameled wire and the 2 nd layer of enameled wire are the bottom layer of the primary coil 13, and the first layer of enameled wire and the second layer of enameled wire are the bottom layer of the primary coil 13

Layer-coated wire and second

The layer enameled wire is primary coil 13 middle level, and the n-1 st layer enameled wire and the nth layer enameled wire are primary coil 13 upper strata, take a percentage to handling 13 bottom of primary coil, 13 middle levels of primary coil and 13 upper strata of primary coil, take a percentage the processing mode and be: the primary coil 13 is wound from the rightmost end of the enameled wire on the layer 1, in the winding process, after the enameled wire on the layer n-1 is wound for a half turn, the enameled wire with a preset length is drawn out from the rightmost end to the right, and is folded to continue to be wound from the right to the left until the leftmost end of the enameled wire on the layer n-1 is reached, the enameled wire with the preset length is drawn out from the leftmost end of the enameled wire on the layer n to the left, and is folded to continue to be wound, then, the winding is started from the leftmost end of the enameled wire on the layer n, the enameled wire with the preset length is drawn out from the leftmost end of the enameled wire on the layer n after the leftmost end of the enameled wire on the layer n is wound for a half; the high-voltage tail end inter-turn tap 1 is formed by an enameled wire with a preset length, which is drawn out rightwards from the rightmost end of a 1 st layer of enameled wire, and an enameled wire with a preset length, which is drawn out rightwards from the rightmost end of a 2 nd layer of enameled wire, and an enameled wire with a preset length, which is drawn out leftwards from the leftmost end of the 1 st layer of enameled wire, and an enameled wire with a preset length, which is drawn out leftwards from the leftmost end of the 2 nd layer of; first, the

Enameled wire with preset length and drawn out rightmost end of layer enameled wire rightmost and second layer enameled wire

The enamelled wire with the preset length drawn out rightwards from the rightmost end of the enamelled wire layer forms a high-voltage head end interlayer tap 5

The left end of the enameled wire layer is drawn out leftwards, and the enameled wire with a preset length and the second end are drawn out leftwards

The enameled wire with the preset length is drawn out leftwards from the leftmost end of the layer enameled wire to form a high-voltage head-end turn-to-turn tap 6; drawing rightmost end of the (n-1) th layer of enameled wire rightwardsThe enameled wire with the preset length and the rightmost end of the nth layer of enameled wire are drawn out rightwards to form a high-voltage head end inter-turn tap 5, and the enameled wire with the preset length and the leftmost end of the (n-1) th layer of enameled wire are drawn out leftwards to form a high-voltage head end inter-turn tap 6.

Taking the number of turns of the primary coil 13 as an example, the winding method of the primary coil 13 is described, wherein the starting position of the primary coil 13 is located at the rightmost side of the first section of the 1 st-layer enameled wire, and the tail end of the 1 st-layer enameled wire is provided with a lead terminal as a low-voltage lead-out wire of the primary coil 13. Winding the 1 st layer of enameled wire for 0.5 turn, then turning back and continuing to wind after a right tap (with the length of 20mm), and winding a layer of capacitor paper with the width of 125mm after winding for 110 turns; winding for 110 turns, and then winding a layer of capacitor paper with the width of 125 mm; continuing winding, after an 329.5 th turn is tapped leftwards (the length is 20mm), turning back and continuing winding; winding a layer of capacitor paper with the width of 125mm after the number of turns of the coil of the layer 1 reaches 330, and then starting to wind the coil of the layer 2 from left to right; after a 330.5-turn position is tapped leftwards (the length is 20mm), the winding is folded back and continuously wound; winding 110 turns of the 2 nd layer coil and then winding a layer of capacitor paper with the width of 125 mm; winding for 110 turns, and then winding a layer of capacitor paper with the width of 125 mm; continuing winding, after an 659.5 th turn is tapped rightwards (the length is 20mm), folding back and continuing winding; after the 2 nd layer coil reaches 330 turns and is wound with a layer of capacitor paper with the width of 125mm, the 3 rd layer coil is wound from right to left. At this time, the tap at the 0.5 th turn and the 659.5 th turn forms a pair of high-voltage tail-end inter-layer taps 1 of the primary coil 13, and the tap at the 329.5 th turn and the 330.5 th turn forms a pair of high-voltage tail-end inter-turn taps 2 of the primary coil 13.

Winding 110 turns of the 3 rd layer coil and then winding a layer of capacitor paper with the width of 125 mm; winding for 110 turns, and then winding a layer of capacitor paper with the width of 125 mm; winding a layer of capacitor paper with the width of 125mm after the 3 rd layer coil reaches 330 turns, and then starting to wind a 4 th layer coil from left to right; winding 110 turns of the 4 th layer of coil and then winding a layer of capacitor paper with the width of 125 mm; winding for 110 turns, and then winding a layer of capacitor paper with the width of 125 mm; winding a layer of capacitor paper with the width of 125mm after the 4 th layer of coil reaches 330 turns, and then winding the 5 th layer of coil from right to left; and repeating the steps until the winding of the 24 th layer is finished.

Winding the 24 th layer of capacitor paper, namely winding a layer of capacitor paper with the width of 125mm after winding the 7920 th turn, then starting to wind a 25 th layer of coil from right to left, after winding to 7920.83 turns and then taking a right tap (with the length of 20mm), turning back and continuing to wind, and winding a layer of capacitor paper with the width of 125mm after winding 110 turns on the 25 th layer of coil; winding for 110 turns, and then winding a layer of capacitor paper with the width of 125 mm; continuing winding, after an 8249.83 th turn is tapped leftwards (the length is 20mm), turning back and continuing winding; winding a layer of capacitor paper with the width of 125mm after the 25 th layer of coil reaches 330 turns, and starting to wind a 26 th layer of coil from left to right; after an 8250.83 th turn position is tapped to the left (with the length of 20mm), the turn is folded back and is continuously wound; winding 110 turns of the 26 th layer of coil and then winding a layer of capacitor paper with the width of 125 mm; winding for 110 turns, and then winding a layer of capacitor paper with the width of 125 mm; continuing winding, after an 8579.83 th turn is tapped rightwards (the length is 20mm), folding back and continuing winding; after the 26 th coil reaches 330 turns and is wound with a layer of capacitor paper with the width of 125mm, the 27 th coil is wound from right to left. The tap at the position of 7920.83 th turn and 8579.83 th turn forms a pair of high-voltage inter-layer taps 3 of primary coil 13, and the tap at the position of 8249.83 th turn and 8250.83 th turn forms a pair of high-voltage inter-layer turns 4 of primary coil 13.

Winding 110 turns of the 27 th layer of coil and then winding a layer of capacitor paper with the width of 125 mm; winding for 110 turns, and then winding a layer of capacitor paper with the width of 125 mm; winding a layer of capacitor paper with the width of 125mm after the 27 th layer of coil reaches 330 turns, and then starting to wind the 28 th layer of coil from left to right; winding 110 turns of the 4 th layer of coil and then winding a layer of capacitor paper with the width of 125 mm; winding for 110 turns, and then winding a layer of capacitor paper with the width of 125 mm; winding a layer of capacitor paper with the width of 125mm after the 28 th layer of coil reaches 330 turns, and then winding a 29 th layer of coil from right to left; and repeating the steps until the winding of the 48 th layer is finished.

Finishing the winding of the 48 th layer, namely winding a layer of capacitor paper with the width of 125mm after the 15840 th turn is finished, then starting to wind a 49 th layer of coil from right to left, turning back and continuing to wind after winding to 15840.17 turns and then taking a right tap (with the length of 20mm), and winding a layer of capacitor paper with the width of 125mm after winding to 110 turns of the 49 th layer of coil; winding for 110 turns, and then winding a layer of capacitor paper with the width of 125 mm; continuing winding, after an 16169.17 th turn is tapped leftwards (the length is 20mm), turning back and continuing winding; after the 49 th layer of coil reaches 330 turns, winding a layer of capacitor paper with the width of 125mm, and starting to wind a 50 th layer of coil from left to right; after an 16170.17 th turn position is tapped to the left (with the length of 20mm), the turn is folded back and is continuously wound; winding 110 turns of the 50 th layer of coil and then winding a layer of capacitor paper with the width of 125 mm; winding for 110 turns, and then winding a layer of capacitor paper with the width of 125 mm; continuing winding, after an 16499.17 th turn is tapped rightwards (the length is 20mm), folding back and continuing winding; after the 50 th coil reaches 330 turns, namely the total number of turns reaches 1650 turns, winding the multilayer capacitor paper as the external insulation 7 of the primary coil 13, and manufacturing a lead terminal as a high-voltage lead-out wire of the primary coil 13. The 15840.17 th turn and 16499.17 th turn tap form a pair of primary coil 13 high-voltage head end inter-layer taps 5, and the 16169.17 th turn and 16170.17 th turn tap form a pair of primary coil 13 high-voltage head end inter-turn taps 6. Thus, the test model is manufactured.

Through the technical scheme, the utility model provides a generator export dry-type voltage transformer test model and preparation method thereof uses generator export dry-type voltage transformer test model to detect the overall parameter change rule of high-voltage head end, high-voltage middle part and high-voltage tail end of trouble dry-type voltage transformer as the sample, provides theoretical support for the research of failure diagnosis and insulation detection method, during the test, after the same group of taps are short-circuited, the short-circuit fault is simulated, the fault of six positions can be simulated; measurement signals are led out from two taps in the same group, so that the distribution condition of the applied voltage in the primary coil 13 can be measured, and theoretical support is provided for the research of the insulation detection method.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (8)

1. A generator outlet dry-type voltage transformer test model is characterized by comprising an iron core, a secondary coil insulation framework, a secondary coil shielding layer, a primary coil insulation framework, a primary coil and an outer insulation layer, wherein the secondary coil insulation framework, the secondary coil shielding layer, the primary coil insulation framework, the primary coil and the outer insulation layer are sequentially wrapped layer by layer from inside to outside by taking the iron core as a central shaft, the primary coil comprises a plurality of layers of coils, and the head end of each layer of coil is connected with the tail end of the next layer of coil;

the primary coil further comprises a high-voltage tail end interlayer tap, a high-voltage tail end turn-to-turn tap, a high-voltage middle layer interlayer tap, a high-voltage middle turn-to-turn tap, a high-voltage head end interlayer tap and a high-voltage head end turn-to-turn tap, wherein the high-voltage tail end interlayer tap and the high-voltage tail end turn-to-turn tap are respectively located at two end portions of the bottom layer of the primary coil, the high-voltage middle layer interlayer tap and the high-voltage middle turn-to-turn tap are respectively located at two end portions of the upper layer of the primary coil, and the high-voltage head end interlayer tap and the high-voltage head end turn-to.

2. The generator outlet dry-type voltage transformer test model as claimed in claim 1, wherein the iron core is a rectangular structure formed by four cylindrical cores connected end to end, and a secondary coil insulation framework is wound at the center of one long side of the iron core.

3. The generator outlet dry-type voltage transformer test model as claimed in claim 2, wherein the secondary coil insulation framework is formed by winding highland barley paper, electrical tape and capacitor paper on an iron core layer by layer from inside to outside, and the secondary coil insulation framework is a cylindrical frame body.

4. The generator outlet dry-type voltage transformer test model according to claim 1, wherein the secondary coil is a plurality of layers of enameled wires wound on the secondary coil insulating framework, and a layer of capacitor paper is wound outside each layer of enameled wire.

5. The generator outlet dry-type voltage transformer test model as claimed in claim 1, wherein the secondary coil shielding layer is capacitor paper, cardboard, electrical tape, conductive self-adhesive tape and semi-conductive crepe paper wound on the secondary coil layer by layer from inside to outside.

6. The generator outlet dry-type voltage transformer test model as claimed in claim 1, wherein the primary coil insulation framework is made of capacitor paper and paperboard wound on the secondary coil shielding layer from inside to outside layer by layer.

7. The generator outlet dry-type voltage transformer test model according to claim 1, wherein the primary coil is a plurality of layers of enameled wires wound on the primary coil insulating framework, and a layer of capacitor paper is wound outside each layer of enameled wire.

8. The test model of the generator outlet dry-type voltage transformer as claimed in claim 7, wherein the primary coil has n layers of enameled wires, n is an even number, the 1 st layer of enameled wire and the 2 nd layer of enameled wire are the primary coil bottom layer, and the second layer of enameled wire is the primary coil bottom layer

Layer-coated wire and second

The layer enameled wire is a middle layer of the primary coil, and the n-1 th layer enameled wire and the nth layer enameled wire are an upper layer of the primary coil.

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