An anti-discharge bipolar voltage transformer

Abstract

The present invention relates to an anti-discharge dual-phase voltage transformer, which is applicable to the field of voltage transformers. In order to solve the problems that the connection line between the high-voltage leads of the two primary windings of the traditional dual-phase voltage transformer is parallel to the width direction of the box body, and when the distance between these two leads is relatively close, creepage is likely to occur, posing a certain safety hazard, and the wires are likely to become loose easily, the present invention changes the position of the high-voltage lead of one of the primary windings. On the premise of ensuring the same body volume, the creepage risk is reduced and the wires are ensured not to become loose easily.

Description

Technical Field

[0001] The present invention relates to the field of voltage transformers, and more particularly to an anti-discharge bipolar voltage transformer. Background Art

[0002] Connect the primary windings of two single-phase voltage transformers. Specifically, ground one lead of each of the two primary windings, and connect the other lead of each to a high voltage with opposite directions, then the two single-phase voltage transformers can be connected. This is called a bipolar voltage transformer in the industry. This type of voltage transformer is widely used in real life, but there are the following problems: First, traditionally, the connection between the leads of the high voltages connected to the two primary windings is parallel to the width direction of the box body. When the distance between these two leads is relatively close, creepage is likely to occur, posing a certain safety hazard; Second, generally, the winding directions of the respective primary windings on the iron cores of the two single-phase voltage transformers are the same. In order to maximize the distance between the leads of the high voltages connected to the two primary windings, the included angle between their orientations is usually made obtuse. In this case, the direction of one of the leads of the high voltage connected to the primary winding will necessarily be opposite to its winding direction, which is likely to cause the wire to become loose. Summary of the Invention

[0003] The purpose of the present invention is to increase the distance between the leads of the high voltages connected to the two primary windings without increasing the volume of the box body of the bipolar voltage transformer, so as to enhance safety, and at the same time make the directions of the leads of the high voltages connected to the two primary windings conform to the winding directions of the primary windings to avoid wire loosening.

[0004] The specific technical solution of the present invention is as follows:

[0005] An anti-discharge bipolar voltage transformer, comprising a box body, a body, a porcelain bushing, and an expander. The body is inside the box body, and the body includes a left iron core and a right iron core.

[0006] The left iron core is concentrically wound with a left primary winding and a left secondary winding from outside to inside in sequence. The upper lead of the left primary winding is called the left upper lead. The left upper lead is connected to a left connecting rod. A left porcelain bushing is sleeved outside the left connecting rod. The top of the left connecting rod is connected to a power supply. The top of the left porcelain bushing is connected to a left expander. The lower part of the left porcelain bushing is connected to a left through pipe above the box body. The lower lead of the left primary winding is called the left lower lead, and the left lower lead is grounded.

[0007] Outside the right iron core, a right primary winding and a right secondary winding are concentrically wound from outside to inside in sequence. The lower lead of the right primary winding is called the right lower lead, which is connected to a right connecting rod. A right porcelain bushing is sleeved outside the right connecting rod. The top of the right connecting rod is connected to a power source. The top of the right porcelain bushing is connected to a right expander. The lower part of the right porcelain bushing is connected to a right through pipe above the box body. The upper lead of the right primary winding is called the right upper lead, which is grounded. The top of the left connecting rod is connected to the conductive bottom plate of the left expander. The conductive bottom plate extends outwards to form a wiring board, and there are threaded holes on the wiring board, and bolts are fixed in the threaded holes. The top of the right connecting rod is connected to the conductive bottom plate of the right expander. The conductive bottom plate extends outwards to form a wiring board, and there are threaded holes on the wiring board, and bolts are fixed in the threaded holes.

[0008] Preferably, the left through pipe is above the left upper lead. The left through pipe is inclined by an angle to the left compared with the vertical state, and the angle range is 0 to 90 degrees, preferably 30 degrees. The right through pipe is above the right lower lead. The right through pipe is inclined by an angle to the right compared with the vertical state, and the angle range is 0 to 90 degrees, preferably 30 degrees. In this way, the leads of the two first windings connected to high voltage are approximately diagonally distributed. Compared with the original position, the relative distance between the two is increased, and the safety is enhanced.

[0009] Preferably, the winding directions of the left primary winding and the right primary winding are the same. In actual situations, generally, wires with the same winding direction are all used.

[0010] Preferably, there is an oil level gauge on the left expander and / or the right expander, which is used to detect the oil level inside the box body.

[0011] Preferably, there are lifting lugs and nameplates on the box body. The lifting lugs are used to lift the voltage transformer, which is convenient for installation and maintenance.

[0012] Preferably, a secondary wiring terminal box is provided on the box body. There are interfaces on the secondary wiring terminal box. The two leads of the left secondary winding and the two leads of the right secondary winding are connected to the interfaces, and a power source is connected at the interfaces. The left lower lead and the right upper lead are connected to the interfaces, and are grounded at the interfaces.

[0013] Preferably, an oil drain valve is provided on the box body. When the oil volume in the box body is too much, the oil can be drained from here.

[0014] Preferably, a grounding bolt is provided on the box body. The grounding bolt is used to ground the box body to ensure that no floating arc potential is generated on the shell during the operation of the transformer.

[0015] Preferably, a U-shaped bracket is provided on the lower surface of the box body to ensure the safe distance from the coil to the ground.

[0016] Beneficial effects: The traditional bipolar voltage transformer is improved. Without changing the volume of the original box body, the distance between the high-voltage wire heads connected to the two primary windings is increased, significantly improving the system safety. At the same time, the directions of the high-voltage wire heads connected to the two primary windings are compliant with the winding direction of the primary windings, avoiding wire loosening. Description of the Drawings

[0017] Figure 1 is the overall front view of the anti-discharge bipolar voltage transformer.

[0018] Figure 2 is the overall left view of the anti-discharge bipolar voltage transformer.

[0019] Figure 3 is the circuit diagram of the anti-discharge bipolar voltage transformer.

[0020] Figure 4 is the front view of the body of the anti-discharge bipolar voltage transformer.

[0021] Figure 5 is the top view of the body of the anti-discharge bipolar voltage transformer.

[0022] Left expander 1, left porcelain bushing 2, left connecting rod 3, left through pipe 4, box body 5, nameplate 6, oil drain valve 7, U-shaped bracket 8, secondary wiring terminal box 9, grounding bolt 10, lifting lug 11, left lower wire head 101 (corresponding to Figure 3 N1 in Figure 3 ), left upper wire head 104 (corresponding to Figure 3 T in Figure 3 ), right lower wire head 204 (corresponding to Figure 3 F in Figure 3 ), right upper wire head 201 (corresponding to Figure 3 N2 in Figure 3 ), first left secondary wire head 102 (corresponding to 1a in

[0023] In order to facilitate observing the structure inside the box body of the anti-discharge bipolar voltage transformer, Figure 1 and Figure 2 the box body is made transparent. Of course, on the premise of meeting the use requirements, a transparent material can also be selected to make the box body; the structure of the body is a central iron core, around which a secondary winding is wound, and around the secondary winding, a primary winding is wound. This is basic knowledge in the field and does not belong to the invention point of this application, so it will not be described.

[0024] The following further describes the specific implementation manners of this application with reference to the drawings:

[0025] AsFigure 1 There are two symmetrically distributed U-shaped brackets 8 on the lower surface of the box 5, a nameplate 6 is provided in the middle of the left side of the front surface, and an oil drain valve 7 is provided near the bottom of the box 5, which is used to drain excess oil when there is too much oil in the box. There is a grounding bolt 10 at the lower right corner of the front surface of the box 5, and a secondary wiring terminal box 9 is provided in the middle of the front surface. There is an interface on the secondary wiring terminal box 9. The first left secondary wire head 102 (corresponding to Figure 3 1a), the second left secondary thread head 103 (corresponding to Figure 3 1n in the middle), the first right secondary line head 202 (corresponding to Figure 3 1b), the second right secondary thread head 203 (corresponding to Figure 3 2n), the lower left thread head 101 (corresponding to Figure 3 N1) and the upper right thread head 201 (corresponding to Figure 3 N2 in the middle is connected to the interface, and is grounded or connected to the power supply at the interface. Two lifting ears 11 are symmetrically distributed on the upper surface of the box body 5, which are used to lift the product during installation and transportation. There are also two through pipes on the box body 5, including a left through pipe 4, on which there is a left porcelain sleeve 2 for insulation, on which there is a left expander 1, and on which there is an oil level gauge 12 for detecting the oil level inside the box body. There is a left connecting rod 3 with one end connected to the left upper wire head 104 (corresponding to Figure 3 The other end passes through the left through pipe 4 and the left porcelain sleeve 2 to connect with the conductive copper bottom plate of the left expander 1. The conductive copper bottom plate extends outward to form a wiring board, and the wiring board has a threaded hole, and a bolt is fixed in the threaded hole. The positional relationship between the right through pipe, the right porcelain sleeve, the right expander, and the right connecting rod on the right side is the same as that on the left side, and the structure of the right expander is the same as that of the left expander 1.

[0026] like Figure 2 , since the left through-tube 4 is above the left upper wire end 104, the left through-tube 4 is tilted 30 degrees to the left compared with the vertical state; the right through-tube is above the right lower wire end 201, and the right through-tube is tilted 30 degrees to the right compared with the vertical state. In this way, the wire ends of the two first windings connected to the high voltage are approximately diagonally distributed, and the relative distance between the two is increased relative to the original position. When observed from the side, it can be found that the two porcelain sleeves do not overlap.

[0027] like Figure 3 , is the circuit diagram of this product, N1 and N2 are grounded, T is connected to a voltage of 27500V, and F is connected to a voltage of -27500V, so the two primary windings are connected. Under the action of electromagnetic induction, the two secondary windings induce voltages of 100V and -100V respectively, realizing voltage mutual induction.

[0028] like Figures 4 - 5, the first left secondary wire end 102, the second left secondary wire end 103, the first right secondary wire end 202, and the second right secondary wire end 203. These four wire ends are all connected to the secondary terminal box 9 to output voltages of 100V and -100V, achieving voltage mutual induction. The left lower wire end 101 and the right upper wire end 201 are both connected to the secondary terminal box 9 to be grounded. Additionally, as shown in the figure, the left primary winding and the right primary winding are wound in the same direction. The left upper wire end 104 finally points to the left, the same as the direction of the left through-tube 4, and the right lower wire end 204 finally points to the right, the same as the direction of the right through-tube, to prevent the coil from loosening.

[0029] What is disclosed above is only the preferred embodiment of the present invention, but it is not used to limit itself. Any changes and modifications made by those skilled in the art without departing from the spirit and connotation of the present invention shall fall within the protection scope of the present invention.

Claims

1. A discharge-proof bipolar voltage transformer, comprising a box body, a core, a porcelain bushing and an expander, characterized in that, The device body is inside the box body, and the device body includes a left iron core and a right iron core; Outside the left iron core, a left primary winding and a left secondary winding are concentrically wound from outside to inside in sequence. The upper lead of the left primary winding is called the left upper lead. The left upper lead is connected to a left connecting rod. A left porcelain bushing is sleeved outside the left connecting rod. The top of the left porcelain bushing is connected to a left expander. The top of the left connecting rod is connected to a power source. The lower part of the left porcelain bushing is connected to a left through pipe above the box body. The lower lead of the left primary winding is called the left lower lead, and the left lower lead is grounded; Outside the right iron core, a right primary winding and a right secondary winding are concentrically wound from outside to inside in sequence. The lower lead of the right primary winding is called the right lower lead. The right lower lead is connected to a right connecting rod. A right porcelain bushing is sleeved outside the right connecting rod. The top of the right porcelain bushing is connected to a right expander. The top of the right connecting rod is connected to a power source. The lower part of the right porcelain bushing is connected to a right through pipe above the box body. The upper lead of the right primary winding is called the right upper lead, and the right upper lead is grounded; The left through pipe is above the left upper lead. The left through pipe is inclined to the left by an angle compared with the vertical state, and the angle range is 30 degrees; the right through pipe is above the right lower lead. The right through pipe is inclined to the right by an angle compared with the vertical state, and the angle range is 30 degrees; The winding directions of the left primary winding and the right primary winding are the same; the leads of the two first windings connected to high voltage are approximately diagonally distributed, and the two porcelain bushings are installed staggered front and back; The lower surface of the box body has a U-shaped bracket; the top of the left connecting rod is connected to the conductive bottom plate of the left expander. The conductive bottom plate extends outwards to form a wiring board. There are threaded holes on the wiring board, and bolts are fixed in the threaded holes; the top of the right connecting rod is connected to the conductive bottom plate of the right expander. The conductive bottom plate extends outwards to form a wiring board. There are threaded holes on the wiring board, and bolts are fixed in the threaded holes.

2. The dual-phase voltage transformer for preventing discharge according to claim 1, characterized in that, There is an oil level gauge on the left expander and / or the right expander.

3. The dual-phase voltage transformer for preventing discharge according to claim 1, characterized in that, There are lifting lugs and nameplates on the box body.

4. A dual-phase voltage transformer for preventing discharge according to claim 1, characterized in that, A secondary wiring terminal box is opened on the box body. There are interfaces on the secondary wiring terminal box. The two leads of the left secondary winding, the two leads of the right secondary winding, the left lower lead and the right upper lead are connected to the interfaces.

5. A discharge-proof bipolar voltage transformer according to claim 1, characterized in that, An oil drain valve is opened on the box body.

6. The dual-phase voltage transformer for preventing discharge according to claim 1, characterized in that, A grounding bolt is opened on the box body.

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