CN209929108U - Self-coupling on-load tap changer - Google Patents
Self-coupling on-load tap changer Download PDFInfo
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- CN209929108U CN209929108U CN201921042562.7U CN201921042562U CN209929108U CN 209929108 U CN209929108 U CN 209929108U CN 201921042562 U CN201921042562 U CN 201921042562U CN 209929108 U CN209929108 U CN 209929108U
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Abstract
The utility model discloses an on-load tap changer of self coupling, including high-voltage coil, on-load tap changing coil, public medium voltage coil and low-voltage coil, the range structure is iron core-public medium voltage coil-on-load tap changing coil-high-voltage coil-low-voltage coil in proper order, wherein the public medium voltage coil end of three-phase is connected to the neutral point department, the high-voltage coil end is connected with on-load tap changing coil in series; the head and tail ends of each phase of high-voltage winding are connected and then connected with the head end of the on-load voltage-regulating coil through a switch, the tail end of the on-load voltage-regulating coil is used as the negative pole of the phase, and the head end of the on-load voltage-regulating coil is used as the positive pole of the phase; the head end of the medium-voltage winding of each phase is connected with a high-voltage regulating pointer which is in contact with the phase on-load voltage regulating coil. The utility model discloses a when the whole accesses of voltage regulation branch wiring, the voltage regulation divides the wiring because the magnetic leakage that the heavy current arouses offsets each other, and the structure is simple and easy to operate to structural parts such as the folder of assurance transformer, arm-tie are not overheated, guarantee the long-term safety and stability of transformer and move.
Description
Technical Field
The utility model relates to a transformer manufacturing technology specifically is an on-load tap changing autotransformer among electric power system.
Background
The voltage regulating coil of the three-phase autotransformer in the existing power equipment generally adopts the wire outgoing mode of wire outgoing from the upper end and the lower end and wire outgoing from the upper end and the lower end in parallel, and the two wire outgoing modes are the conventional voltage regulating coil structure. When the actual power grid operates, the position of the voltage regulating coil is determined by the distribution of the system impedance configuration problem, namely high-medium impedance, medium-low impedance and high-low impedance, so that the position of the voltage regulating coil and the wire outlet mode are determined; if a conventional wire outlet mode is adopted for a high-capacity autotransformer, when the voltage regulating coil is completely connected, the sum of all tapping currents is very large, usually reaching thousands of amperes, if the voltage regulating coil is close to an iron core, the generated magnetic leakage can cause the iron core to be overheated, gases such as hydrogen, ethylene and the like in the transformer can be increased rapidly, and the safe operation of the transformer is damaged; meanwhile, the transformer is complex in structure, so that the transformer is large in size, and the design and manufacturing cost of the transformer is high.
SUMMERY OF THE UTILITY MODEL
To among the prior art three-phase autotransformer hinder greatly, harm transformer safe operation and structure complicacy, manufacturing cost height not enough the utility model provides a simplify under the prerequisite of guaranteeing transformer and electric wire netting operating performance structure, reduce manufacturing cost's adoption fall "U" type voltage regulation coil's on-load tap changing autotransformer.
In order to solve the technical problem, the utility model discloses a technical scheme is:
the utility model relates to an on-load tap changer of self coupling, including high-voltage coil, on-load tap changing coil, public medium voltage coil and low-voltage coil, the range structure is iron core-public medium voltage coil-on-load tap changing coil-high-voltage coil-low-voltage coil in proper order, wherein the public medium voltage coil end of three-phase is connected to the neutral point department, the high-voltage coil end is established ties and is carried the tap changing coil; the head and tail ends of each phase of high-voltage winding are connected and then connected with the head end of the on-load voltage-regulating coil through a switch, the tail end of the on-load voltage-regulating coil is used as the negative pole of the phase, and the head end of the on-load voltage-regulating coil is used as the positive pole of the phase; the head end of the medium-voltage winding of each phase is connected with a high-voltage regulating pointer which is in contact with the phase on-load voltage regulating coil.
The loaded voltage regulating coil adopts an inverted U-shaped structure, the inverted U-shaped structure adopts a double-layer spiral structure for the voltage regulating coil, and the leading-out wires of the voltage regulating coil are all led out from the lower part.
The utility model has the following beneficial effects and advantages:
1. the utility model discloses the current opposite direction of inlayer in the U-shaped coil for when the pressure regulating divides the whole accesses of wiring, the pressure regulating divides the wiring because the magnetic leakage that the heavy current arouses offsets each other, need not take other measures and can reduce the overheated problem that the magnetic leakage arouses, and the structure is simple and easy, thereby guarantees that the folder of transformer, components such as arm-tie are not overheated, guarantees the long-term safety and stability of transformer and moves.
Drawings
Fig. 1A is a vector connection diagram (one) of the autotransformer of the present invention, YNaod 1;
fig. 1B is a vector connection diagram (ii) of the autotransformer of the present invention, YNaod 1;
fig. 2 is a schematic diagram of the connection of the inventive YNaod1 autotransformer;
FIG. 3 is a schematic diagram of the low-voltage side of the autotransformer of the present invention YNaod 1;
fig. 4 is a structural diagram of a voltage regulating coil of the inventive YNaod1 autotransformer.
Wherein, 1 is the on-load voltage regulation coil, 2 is high-voltage coil, 3 is the low-voltage coil, 4 is the inlayer voltage regulation coil, and 5 is the skin voltage regulation coil.
Detailed Description
The invention will be further explained with reference to the drawings attached to the specification.
The utility model relates to an on-load tap changer of self coupling, including high-voltage coil, on-load tap changing coil, public medium voltage coil and low-voltage coil, the range structure is iron core-public medium voltage coil-on-load tap changing coil-high-voltage coil-low-voltage coil in proper order, wherein the public medium voltage coil end of three-phase is connected to the neutral point department, the high-voltage coil end is established ties and is carried the tap changing coil; the head and tail ends of each phase of high-voltage winding are connected and then connected with the head end of the on-load voltage-regulating coil through a switch, the tail end of the on-load voltage-regulating coil is used as the negative pole of the phase, and the head end of the on-load voltage-regulating coil is used as the positive pole of the phase; the head end of the medium-voltage winding of each phase is connected with a high-voltage regulating pointer which is in contact with the phase on-load voltage regulating coil.
The on-load voltage regulating coil adopts an inverted U-shaped structure; the inverted U-shaped structure is a double-layer spiral structure of the voltage regulating coil and is like the inverted U-shaped structure, so the structure is called as the U-shaped structure. The outgoing lines of the on-load voltage regulating coil are all led out from the lower part.
As shown in fig. 1A-1B, the connection group of the transformer of the present invention is only an autotransformer connected by YNa0 d.
In this embodiment, a three-phase five-column type auto-transformer with high voltage on-load voltage regulation by means of connection of the YNa0d1 is taken as an example, and is an auto-transformer of a phase air reactor, and mainly adopts a three-phase five-column type core structure, and only includes a high-voltage coil, a common medium-voltage coil, an on-load voltage regulation coil and a low-voltage coil, the YNa0d is connected with the auto-transformers of the group, and the arrangement of the coils is as follows: iron core-public medium voltage coil-on-load voltage regulating coil-high voltage coil-low voltage coil. The transformer with the structure just can meet the impedance requirement of an actual product.
The common medium voltage coil of the three phases is terminated at the neutral point HOXO. The tail end of the high-voltage coil is provided with a load voltage-regulating coil.
As shown in fig. 2, the utility model discloses autotransformer is the high pressure on-load voltage regulation, and autotransformer's high-voltage coil adopts the tip outlet structure, and on-load voltage regulation coil is positive and negative accent, and public medium voltage coil is qualified for the next round of competitions for the tip, and the public medium voltage coil end-to-end connection of three-phase is to neutral point HOXO department. The coil arrangement mode is as follows: iron core-common medium voltage coil-voltage regulating coil-high voltage coil-low voltage coil.
As shown in fig. 3, the three-phase connection is d1 connection for the low-voltage coil of the autotransformer of the present invention.
The voltage regulating mode of the autotransformer is high-voltage terminal voltage regulation, the low-voltage winding does not carry voltage regulation, and the voltage regulating range is +/-16 multiplied by 0.9375 percent.
As shown in fig. 4, do the utility model discloses autotransformer on-load voltage regulation coil's structure picture, the utility model discloses autotransformer voltage regulation coil lead-out wire is whole to be drawn forth in the lower part, and is different with conventional product, and conventional product adopts the mode of being qualified for the next round of competitions at both ends about the voltage regulation coil of the conventional autotransformer of same array mode adopts, the utility model discloses a U type coil inside and outside layer is inlayer voltage regulation coil 4 and outer voltage regulation coil 5's current opposite direction promptly for when the voltage regulation branch line is whole to be connected, the voltage regulation branch line is because the magnetic leakage that heavy current arouses offsets each other, need not take other measures to reduce the overheated problem that the magnetic leakage arouses, and the structure is simple and easy, thereby guarantees that the folder of transformer, structural components such as arm-tie are not overheated.
Claims (2)
1. An on-load tap changer of self coupling which characterized in that: the transformer comprises a high-voltage coil, an on-load voltage regulation coil, a common medium-voltage coil and a low-voltage coil, wherein the arrangement structure is sequentially an iron core, the common medium-voltage coil, the on-load voltage regulation coil, the high-voltage coil and the low-voltage coil, the tail ends of the three-phase common medium-voltage coil are connected to a neutral point, and the tail ends of the high-voltage coils are connected with the on-load voltage regulation; the head and tail ends of each phase of high-voltage winding are connected and then connected with the head end of the on-load voltage-regulating coil through a switch, the tail end of the on-load voltage-regulating coil is used as the negative pole of the phase, and the head end of the on-load voltage-regulating coil is used as the positive pole of the phase; the head end of the medium-voltage winding of each phase is connected with a high-voltage regulating pointer which is in contact with the phase on-load voltage regulating coil.
2. The on-load tap changer of claim 1, wherein: the loaded voltage regulating coil adopts an inverted U-shaped structure, the inverted U-shaped structure adopts a double-layer spiral structure for the voltage regulating coil, and the leading-out wires of the voltage regulating coil are all led out from the lower part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921042562.7U CN209929108U (en) | 2019-07-05 | 2019-07-05 | Self-coupling on-load tap changer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921042562.7U CN209929108U (en) | 2019-07-05 | 2019-07-05 | Self-coupling on-load tap changer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209929108U true CN209929108U (en) | 2020-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921042562.7U Active CN209929108U (en) | 2019-07-05 | 2019-07-05 | Self-coupling on-load tap changer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209929108U (en) |
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2019
- 2019-07-05 CN CN201921042562.7U patent/CN209929108U/en active Active
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