Wiring method of power unit and transformer in high-voltage frequency converter and high-voltage frequency converter

Abstract

The invention discloses a high-voltage frequency converter, a power unit thereof, and a wiring method of a transformer. The wiring method of the transformer comprises that 1) an inter-cabinet transition device is arranged between a power cabinet and a transformer cabinet of the high-voltage frequency converter; 2) pre-wiring is carried out via 3D software, the laying path and length of each segment of 10kV cable between connection bolts of the inter-cabinet transition device and the secondary terminals of the transformer are determined, and the laying path and length of each segment of 1kV cable between the connection bolts of the inter-cabinet transition device and connection terminals of a power unit are determined; and 3) the cables are laid and connected. The high-voltage frequency converter comprises the power cabinet, the transformer cabinet and the inter-cabinet transition device therebetween. The high-voltage frequency converter, the power unit thereof, and the wiring method of the transformer have the advantages that the cables are short, cable connection is stable and reliable, cable layout is structured, the heat radiation performance is high, the assembling efficiency of the power cabinet is high, production and processing are convenient, the production and labor intensity is low, and the onsite cabinet combination time is short.

Description

technical field [0001] The invention relates to high-voltage frequency conversion equipment, in particular to a wiring method for a power unit and a transformer in a high-voltage frequency converter and a high-voltage frequency converter. Background technique [0002] At present, the high-voltage inverter mainly includes power unit, low-voltage control part, input and output voltage and current protection devices, phase-shifting transformer and other components. These components are divided into cabinets according to their performance parameters such as voltage level, current size, and volume size, and are divided into three parts: power cabinet, control cabinet, and transformer cabinet. Among them, the transformer cabinet mainly houses the phase-shifting transformer; the power cabinet mainly houses the power unit; the control cabinet mainly includes low-voltage control parts and protection devices such as input and output voltage and current. The three-phase power supply o...

AI Technical Summary

Problems solved by technology

When the device is transported and shipped, each cable must be disassembled and packaged, and it must be reconnected at the user site, which increases the cost of installation, transportation and maintenance

[0005] 3. In this way, the cable connection between cross-cabinets is more difficult than the cable connection in a single cabinet, which requires that the cabinets must be combined when assembling high-voltage inverters to complete the cable wiring work

Due to space and time constraints, it is often not possible to combine cabinets when producing high-voltage inverters. The length of each cable can only be estimated according to the distance between the connection point and the square hole of each cabinet.

The cable estimation is generally based on the principle of high not low, which makes the cable length difficult to control and the cost of the cable increases

At the same time, redundant cables are entangled, drooped, and overlapped, which affects the appearance of the whole machine

[0006] 4. Since there is no unified wiring method for high-voltage inverters at present, the wiring of high-voltage inverters is relatively random, which is not conducive to the mass production of high-voltage inverters, and is also not conducive to the standardization and generalization of high-voltage inverters.

[0007] In summary, the existing high-voltage frequency converters have: 1. The high-voltage cable connection brings difficulties in transportation, assembly, disassembly, and maintenance; 2. The high-voltage cable is too long and the length is not easy to control, which increases the cost of the cable. Difficulties; 3. Problems of terminal deformation and loosening caused by long-distance suspended connection of high-voltage cables; 4. Problems of high-voltage cable winding, crowded arrangement, overlapping, and poor heat dissipation

Images