High-capacity cascade voltage transformer for station power supply in transformer substation

Abstract

The invention relates to the field of a power supply of a transformer substation, and concretely relates to a high-capacity cascade voltage transformer for a station power supply in the transformer substation. The high-capacity cascade voltage transformer comprises an expander, a porcelain bushing, an iron core, a primary winding, a secondary winding, an insulating bracket, a secondary junction box and a base, the expander is arranged at the upper end of the porcelain bushing, and the base is arranged at the lower end of the porcelain bushing; the iron core is supported in the porcelain bushing through the insulating bracket, the primary winding and the secondary winding are wound on the iron core, the upper end of the porcelain bushing is provided with a primary terminal, the primary terminal is connected with the primary winding through a high-voltage primary lead, the base is internally provided with the secondary junction box with a secondary wiring board; and the secondary winding is connected with the secondary wiring board through a secondary winding lead, and a miniature circuit breaker is arranged at one end, connected with the secondary junction box, of the secondary wiring board. The secondary winding can directly output 220V alternating current for power supply of the transformer substation, and is safe and reliable to use.

Description

technical field [0001] The invention relates to the field of substation power supplies in substations, in particular to a large-capacity cascaded voltage transformer used for substation power supplies in substations. Background technique [0002] The normal operation of a substation is inseparable from the power supply, also known as the station power supply. In addition to indoor lighting, office power and lighting power in the switch cabinet, the substation also needs to be powered by the operating power supply to the circuit breaker protection control circuit, signal circuit, relay protection and monitoring devices, all of which need to be supplied with alternating current by the station power supply. Or rectified to direct current as the operating power supply. [0003] The power supply design of the station power supply generally requires two power supplies. Large and medium-sized substations can design two transformers for use. When the 220 / 380V power supply can be ob...

AI Technical Summary

Problems solved by technology

Small-scale substations generally obtain 220 / 380V power from the low-voltage side of the main transformer. A larger-capacity voltage transformer can be considered, and its secondary winding directly outputs 220V AC voltage as the station power supply, because the voltage transformer is cheaper than the transformer. Very low, so the use of voltage transformers in small substations will save a lot of capital investment, but the secondary output capacity of the cascaded voltage transformers in the prior art is small, so it needs to be improved in order to be suitable for station power supplies

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