Capacity-regulating transformer with lightning protection function

Abstract

The invention discloses a capacity-regulating transformer with the lightning protection function, which comprises a low-voltage winding and a high-voltage winding. When the capacity-regulating transformer is in a high-capacity state, the windings adopt the Dyn11 connection mode. When the transformer is switched to be in a low-capacity state, the windings adopt the Yzn11 connection mode. The capacity-regulating transformer is a special capacity-regulating transformer. When the capacity of the capacity-regulating transformer is switched to be small, the Yzn11 connection mode is achieved. The capacity of bearing unbalanced loads is high, that is, the capacity of bearing single-phase power supply is high. The capacity-regulating transformer is particularly suitable for places (such as rural areas and mountain areas) where three-phase loads are difficult to balance. The lightning protection performance of the transformer is good. The transformer is particularly suitable for being used as alightning protection transformer in a heavy-thunder region or a region with high soil resistivity.

Description

technical field [0001] The invention belongs to the technical field of transformer equipment in the power industry, and in particular relates to a capacity regulating transformer with a lightning protection function. Background technique [0002] The on-load capacity regulating transformer is a transformer with two rated capacities, large and small. According to the size of the load, the corresponding capacity regulating switch is used to switch the connection mode of the transformer windings without cutting off the power supply, and then realize the transformer between the two different capacities. switch between. [0003] The lightning protection measures of the on-load capacity regulating transformer are mainly realized by the external lightning protection device. This kind of lightning protection device by destroying its own structure has high cost and poor lightning protection effect; [0004] However, the commonly used on-load capacity-regulating transformer has a str...

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Problems solved by technology

[0003] The lightning protection measures of the on-load capacity regulating transformer are mainly realized through the external lightning protection device. This kind of lightning protection device by destroying its own structure has high cost and poor lightning protection effect;

[0004] At present, the commonly used on-load capacity regulating transformer is a structure in which the high-voltage side winding is D-Y conversion and the low-voltage side winding is parallel-serial conversion, which makes its lightning protection structure particularly complicated. Moreover, this kind of capacity regulating transformer is Yyn0 connection, and as the power and quantity of single-phase electrical equipment increase, temporary power consumption, line faults, seasonal power consumption and other factors cause unbalanced distribution transformer three-phase load, Yyn0 connection will lead to The following problems: (1) Increase line loss and transformer loss; (2) Reduce transformer output; (3) Displacement of neutral point, phase voltage may rise to line voltage, and burn out electrical equipment; (4) Transformer outlet voltage Unbalanced, the three-phase voltage deviation at the user end is large, and the voltage quality cannot be guaranteed; (5) Harmonic voltage is generated to pollute the power grid

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