Tank-type iron core high voltage test reactor

Abstract

The present invention discloses a tank-type iron core high-voltage test reactor, which is characterized in that a tank-type iron core composed of a core column, an outer ring and a bottom cake is adopted; the coil is sleeved on the core column, the inner lead is connected to the high-voltage terminal of the reactor, and the outer lead is connected to the low-voltage terminal of the reactor; the bottom cake falls on the bottom plate of the reactor, and a long strip of insulating pads is padded in between, and the pads are arranged in a cross shape; the bottom plate is grounded, and the bottom cake is connected to the low-voltage terminal; the core column is placed on the bottom cake, and a circular insulating pad and a long strip of insulating pad are padded in the middle, and the pads are located under the pad and distributed in a cross shape; the coil is placed on the bottom cake, and a ring-shaped insulating pad and a long strip of insulating pad are padded in between, and the pads are located under the pad and distributed in a cross shape; the outer ring falls on the bottom cake, and the two are at the same potential. The reactor of the present invention meets the requirements for vehicle-mounted use, and compared with general air-core and half-core reactors, the total height is reduced, which is convenient for transportation; compared with full-core reactors, the volume and manufacturing difficulty are greatly reduced.

Description

Technical Field

[0001] The invention relates to high voltage test equipment, in particular to a large-capacity resonant reactor for on-site AC withstand voltage test. Background Art

[0002] Resonant reactors for high voltage tests generally adopt three structures: air-core type and half-core (rod-shaped iron core) type with open magnetic circuit and full-core type with closed magnetic circuit. Placing the reactor with open magnetic circuit structure on the car, factory or on the ground will form eddy currents on the metal floor of the car, on the steel bars under the concrete floor of the workshop or on the site, resulting in serious heat loss. A common way to reduce this loss is to add an insulating base under the reactor and raise the reactor to keep it away from the car board or the ground with steel bars. However, after the reactor is raised, not only the center of gravity is increased, the transportation is unstable, but also it may be too high, making it impossible for the transport vehicle to pass through the bridge hole or tunnel. The reactor with closed full-core can be placed directly on the car board or on the ground without being raised, but its volume and manufacturing difficulty are greatly increased compared with air-core and half-core reactors. Summary of the invention

[0003] The purpose of the present invention is to provide a tank-type iron core high-voltage test reactor, which can be directly placed on a vehicle for use without adding a raised base. To achieve this purpose, the present invention uses a core column, an outer ring and a bottom cake to form a tank-type iron core; a coil is mounted on the core column, the inner layer high-voltage lead of the coil is connected to the high-voltage terminal of the reactor, and the outer layer low-voltage lead is connected to the low-voltage terminal of the reactor; the bottom cake falls on the bottom plate of the reactor, and a long strip of insulating pads are padded between them, and the pads are arranged in a cross shape; the bottom plate is grounded, and the bottom cake is connected to the low-voltage terminal; the core column is placed on the bottom cake, and a circular insulating pad and a long strip of insulating pad are padded in the middle, and the pads are located under the pads and are distributed in a cross shape, and the two are superimposed to withstand the high voltage (rated voltage) between the core column and the bottom cake; the coil is placed on the bottom cake, and a ring-shaped insulating pad and a long strip of insulating pad are padded between them, and the pads are located under the pads and are distributed in a cross shape, and the two are superimposed to withstand the high voltage (rated voltage) between the coil and the bottom cake; the outer ring falls on the bottom cake, and the two are equipotential.

[0004] The core column, outer ring and base cake are all radially stacked with silicon steel sheets and are respectively cast and cured with epoxy resin; the manufactured core column and outer ring are placed on the base cake to form a complete iron core, like a can, and its central cross-section shape is a "mountain" shape.

[0005] The core column, coil and outer ring are tightened with the bottom plate through a pressure plate and a pull rod to form longitudinal fixation, and are transversely fixed by inserting a support bar between the core column and the coil and inserting a top block between the core column at the upper end of the coil and the outer ring.

[0006] The high-voltage terminal is led out from the center of the insulating cover plate by a conductive rod, and a voltage-grading ring is installed on the upper end thereof to play a role in uniform high-voltage electric field; the low-voltage terminal is located at the lower flange of the insulating cylinder.

[0007] The present invention adopts an annular capsule which is hoisted on the reverse side of the insulating cover plate to compensate for the volume change of transformer oil in the reactor caused by the temperature difference.

[0008] The invention adopts an oil-immersed insulation structure, wherein the outer shell is composed of an insulation cylinder, a steel cylinder and an insulation cover plate, and the insulation cover plate and the insulation cylinder are connected and fixed by non-magnetic non-metallic bolts.

[0009] The reactor of the present invention is directly placed on the vehicle for operation, and will not generate eddy current loss in the metal floor of the vehicle, thus meeting the requirements for vehicle-mounted use. Compared with general air-core and half-core reactors, the total height of the reactor of the present invention is reduced, making it easier to transport; compared with full-core reactors, the volume and manufacturing difficulty are greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic diagram of a tank-type iron core reactor according to Embodiment 1 of the present invention (front view); Figure 2 is a schematic diagram (top view) of a tank-type iron core reactor according to Embodiment 1 of the present invention; Figure 3 Schematic diagram of a tank-type iron core reactor according to Embodiment 2 of the present invention (front view). DETAILED DESCRIPTION

[0011] Example 1 See Appendix Figure 1 and attached Figure 2 A tank-type iron core high-voltage test reactor includes a high-voltage guide rod 1, a voltage-grading ring 2, a high-voltage lead 3, a cover plate 4, a capsule 5, an epoxy cylinder 6, a low-voltage lead 7, a low-voltage terminal 8, a core column 9, a coil 10, an outer ring 11, a coil pad 12, a cake upper pad 13, a steel cylinder 14, a cake lower pad 15, a bottom cake 16, a core column pad 17, a pull rod 18, a bottom plate 19, a stay 20, a top block 21, a pressure plate 22, a large nut 23, etc. The manufacturing process is as follows:

[0012] Iron core: The three parts of the pot core are cut into radial graded pieces, arranged into a circle in radial steps in their respective molds, vacuum poured with epoxy resin, and formed into a core column 9, an outer ring 11 and a bottom cake 16 after curing and bonding.

[0013] Assembly of the device body: first, place the lower pad 15 of the cake in a cross shape on the bottom plate 19, and then place the bottom cake 16 thereon; place the upper pad 13 of the cake in a cross shape on the bottom cake 16, and then place the core column pad 17 thereon, hang the core column 9 on the core column pad 17, and install the pull rod 18; hang the coil 10 together with the coil pad 12 on the upper pad 13 of the cake, drive the support bar 20 between the coil 10 and the core column 9 to fix the coil 10 horizontally; hang the outer ring 11 on the bottom cake 16, drive the top block 21 between the core column 9 at the upper end of the coil 10 and the outer ring 11 to fix the outer ring 11 horizontally; put the pressing plate 22 on the core column 9, the top block 21 and the outer ring 11, tighten the large nut 23 to fix the core column 9, the coil 10 and the outer ring 11 longitudinally; connect the high-voltage lead 3 to the high-voltage guide rod 1.

[0014] Drying and oiling: put the assembled device body into a vacuum tank for drying. After drying out of the tank, hang the outer cylinder which is connected by the epoxy cylinder 6 and the steel cylinder 14 on the bottom plate 19 and fix it with bolts; connect the low-voltage lead wire 7 to the low-voltage terminal 8, and then put it into the tank for vacuum extraction and oiling.

[0015] Assembly of the cover plate: lift the cover plate 4, install the annular airbag 5 on its reverse side, then move it onto the epoxy cylinder 6 and drop it down, and fix it with nylon bolts; then fix the equalizing ring 2 on the high-pressure guide rod 1.

[0016] Example 2 See Appendix Figure 1 and attached Figure 3 A tank-type iron core high-voltage test inductor includes a high-voltage terminal 1, a grading ring 2, a high-voltage lead 3, an epoxy cover plate 4, a capsule 5, an epoxy cylinder 6, a low-voltage lead 7, a low-voltage terminal 8, a core column 9, a coil 10, an outer ring 11, a coil pad 12, an upper pad 13, a lower pad 15, a bottom pancake 16, a core column pad 17, a pull rod 18, a bottom plate 19, a stay 20, a top block 21, a pressure plate 22, a large nut 23, etc.

[0017] Compared with Example 1, the only difference is the outer cylinder, there is no steel cylinder 14, the epoxy cylinder 6 is heightened, and the other parts and manufacturing processes are the same. The characteristic is that the outer cylinder is simple to manufacture, but the heat dissipation performance is reduced.

Claims

1. A tank-type iron core high-voltage test reactor, characterized in that A pot-type iron core is composed of a core column, an outer ring and a bottom cake; a coil is sleeved on the core column, the inner lead of the coil is connected to the high-voltage terminal of the reactor, and the outer lead is connected to the low-voltage terminal of the reactor; the bottom cake falls on the bottom plate of the reactor, and is padded with long strip insulating pads in the middle, and the pads are arranged in a cross shape; the bottom plate is grounded, and the bottom cake is connected to the low-voltage terminal; the core column is placed on the bottom cake, and is padded with a circular insulating pad and a long strip insulating pad in the middle, the pads are located under the pad and are distributed in a cross shape, and the two are superimposed to withstand the high voltage between the core column and the bottom cake; the coil is placed on the bottom cake, and is padded with a ring-shaped insulating pad and a long strip insulating pad in the middle, the pads are located under the pad and are distributed in a cross shape, and the two are superimposed to withstand the high voltage between the coil and the bottom cake; the outer ring falls on the bottom cake, and the two are at the same potential.

2. A tank-type iron core high-voltage test reactor according to claim 1, characterized in that The core column, outer ring and bottom cake are all radially stacked with silicon steel sheets and are respectively cast and solidified with epoxy resin; the manufactured core column and outer ring are placed on the bottom cake to form a complete iron core, like a can, and its central cross-section shape is a "mountain" shape.

3. A tank-type iron core high-voltage test reactor according to claim 1, characterized in that The core column, coil and outer ring are tightened with the bottom plate through a pressure plate and a pull rod to form longitudinal fixation, and are transversely fixed by inserting a support bar between the core column and the coil and inserting a top block between the core column at the upper end of the coil and the outer ring.

4. A tank-type iron core high-voltage test reactor according to claim 1, characterized in that The high-voltage terminal is led out from the center of the insulating cover plate by a conductive rod, and a voltage-grading ring is installed on the upper end thereof to play a role in uniform high-voltage electric field; the low-voltage terminal is located at the lower flange of the insulating cylinder.

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