CN211266735U - Cascade type high-voltage frequency converter - Google Patents
Cascade type high-voltage frequency converter Download PDFInfo
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- CN211266735U CN211266735U CN201921751738.6U CN201921751738U CN211266735U CN 211266735 U CN211266735 U CN 211266735U CN 201921751738 U CN201921751738 U CN 201921751738U CN 211266735 U CN211266735 U CN 211266735U
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Abstract
The utility model discloses a cascade type high-voltage inverter, including the power unit who moves the transformer and the multiunit is established ties, every power unit is connected with the low pressure side that moves the isolation transformer through the cable respectively, the cable be three-core cable, power unit's three-phase input connects the three-phase output that moves the low pressure side of isolation transformer through three-core cable. The utility model discloses a behind the three-core cable, it uses the reduction of cable quantity to original third, and the cable total volume is showing and is reducing, and the cost of cascading type high-voltage inverter is showing and is reducing, and cascading type high-voltage inverter reliability improves.
Description
[ technical field ]
The utility model relates to a high-voltage inverter especially relates to a cascade type high-voltage inverter.
[ background art ]
The cascade high-voltage variable-frequency speed regulation device is widely applied to industries such as steel, electric power, mining and cement due to excellent energy-saving effect and performance, but the fault rate is high due to the complex structure, and the reliability is poor.
The invention with the application number of CN201110271028.5 discloses a mining explosion-proof high-voltage frequency converter, which comprises a phase-shifting transformer unit explosion-proof box and a power unit explosion-proof box, wherein a phase-shifting isolation transformer and a heat dissipation system are arranged in the phase-shifting transformer unit explosion-proof box, and a plurality of groups of power units, a control unit and a heat dissipation system which are connected in series are arranged in the power unit explosion-proof box. The phase-shifting multiple groups of power units connected in series are respectively connected with the low-voltage side of the phase-shifting isolation transformer, and the power units are connected with the control unit through optical fibers.
The topological structure of the traditional cascade high-voltage frequency converter is shown in figure 1, wherein in figure 1, wa 11-wa 83, wb 11-wb 83 and wc 11-wc 83 represent connecting cables for connecting the secondary windings of the phase-shifting transformer and the power units. For a 10kV 8-level power unit cascade high-voltage frequency converter, up to 72 cables connecting a phase-shifting transformer and a power unit are required, the ground insulation voltage requirement of each cable is 10kV level, and the insulation voltage requirement of interphase cables of the power unit is 690V level; a6 kV 6-level power unit cascade high-voltage frequency converter has up to 54 cables connecting a phase-shifting transformer and a power unit, wherein the ground insulation voltage requirement of each cable is 6kV level, and the insulation voltage requirement of interphase cables of the power unit is 690V level.
[ summary of the invention ]
The to-be-solved technical problem of the utility model is to provide a connect the cascade type high-voltage inverter that the cable quantity between phase-shifting transformer and the power unit is less, connection cost is low.
In order to solve the technical problem, the utility model provides a, a cascade type high-voltage inverter, including the power unit who moves the transformer and the multiunit is established ties, every power unit is connected with the low pressure side that moves the isolation transformer through the cable respectively, the cable be three-core cable, the three-phase input of power unit connects the three-phase output who moves the low pressure side of isolation transformer through three-core cable.
In the cascaded high-voltage frequency converter, the three-core cable comprises three core wires, a ground insulation layer and a sheath layer, wherein the core wires comprise metal wire cores and core wire insulation layers; the ground insulating layer wraps the peripheries of the three core wires, and the sheath layer wraps the peripheries of the ground insulating layers.
The utility model discloses a behind the three-core cable, it uses the reduction of cable quantity to original third, and the cable total volume is showing and is reducing, and the cost of cascading type high-voltage inverter is showing and is reducing, and cascading type high-voltage inverter reliability improves.
[ description of the drawings ]
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a circuit diagram of a main loop of a 10kV 8-class power unit cascaded high-voltage frequency converter in the prior art.
Fig. 2 is a circuit diagram of the main loop of the cascade type high-voltage frequency converter with 10kV 8-class power units according to the embodiment of the present invention.
Fig. 3 is a cross-sectional view of the phase-shifting transformer and the power unit connection cable according to the embodiment of the present invention.
[ detailed description of the invention ]
The embodiment of the utility model provides a structure in 10kV8 level power unit cascade type high-voltage inverter major loop is shown in figure 2, including the power unit who moves the transformer and the multiunit is established ties mutually, every power unit is connected with the low pressure side that moves the isolation transformer through the cable respectively, the cable be three-core cable, power unit's three-phase input connects the three-phase output that moves the low pressure side of isolation transformer through three-core cable.
In fig. 2, wa1 to wa8, wb1 to wb8, and wc1 to wc8 are connection cables connecting the secondary winding of the phase-shifting transformer and the power units, and 24 cables are provided in total, each cable includes 3 core wires, rated voltage between the core wires is 690V, and rated voltage of the core wires to ground is 10 kV. From fig. 2 can know, use power unit A1 and phase-shifting transformer secondary winding to be connected as an example, the utility model discloses connecting cable only needs 3 single cores such as wa11, wb11, wc11 to need power unit A1 and phase-shifting transformer secondary winding connecting cable among the prior art that figure 1 shows to be single 1, compares with prior art, the utility model discloses used cable volume obviously reduces, the cable quantity is less, and the converter structure becomes simple, and is with low costs, the reliability is high.
As shown in fig. 3, the three-core cable includes three core wires 1, a ground insulation layer 3, and a sheath layer 4. The core wire comprises a metal wire core 101 and a core wire insulating layer 102; the ground insulating layer 3 wraps the peripheries of the three core wires 1, and the sheath layer 4 wraps the peripheries of the ground insulating layers 3.
Rated voltage between three core wires 1 of cable is 690V grade, and three core wires of cable are to ground rated voltage is the rated voltage grade of high-voltage inverter (for example 10kV high-voltage inverter is 10kV, 6kV high-voltage inverter is 6 kV).
The utility model discloses a cascaded type high-voltage inverter of three-core cable, it uses cable quantity to reduce to original third, and the cable total volume is showing and is reducing, and cascaded type high-voltage inverter's cost is showing and is reducing, and cascaded type high-voltage inverter reliability improves.
Claims (2)
1. The utility model provides a cascade type high-voltage inverter, includes phase-shifting transformer and the power unit of multiunit series connection, every power unit is connected with the low pressure side of phase-shifting isolation transformer through the cable respectively, its characterized in that, the cable be three-core cable, the three-phase input of power unit connects the three-phase output of the low pressure side of phase-shifting isolation transformer through three-core cable.
2. The cascaded high-voltage frequency converter according to claim 1, wherein the three-core cable comprises three core wires, a ground insulation layer and a sheath layer, the core wires comprise a metal wire core and a core wire insulation layer; the ground insulating layer wraps the peripheries of the three core wires, and the sheath layer wraps the peripheries of the ground insulating layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921751738.6U CN211266735U (en) | 2019-10-16 | 2019-10-16 | Cascade type high-voltage frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921751738.6U CN211266735U (en) | 2019-10-16 | 2019-10-16 | Cascade type high-voltage frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211266735U true CN211266735U (en) | 2020-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921751738.6U Active CN211266735U (en) | 2019-10-16 | 2019-10-16 | Cascade type high-voltage frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211266735U (en) |
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2019
- 2019-10-16 CN CN201921751738.6U patent/CN211266735U/en active Active
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| TR01 | Transfer of patent right |
Effective date of registration: 20221205 Address after: 518000 3F, kumak building, Dongzhou community, Guangming Street, Guangming District, Shenzhen, Guangdong Patentee after: Shenzhen kumak Technology Co.,Ltd. Address before: 518000 706, North block, Tairan Cangsong building, Tairan 6th Road, Shatou street, Futian District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Cumark New Technology Co.,Ltd. |