36-level high-precision capacitance and voltage adjusting transformer for distributing line

Abstract

The invention relates to the field of voltage stabilization electric equipment for electric lines with the voltage below 35 kV, in particular to a 36-level high-precision capacitance and voltage adjusting transformer for a distributing line. The capacitance and voltage adjusting transformer comprises a low-voltage winding and a high-voltage winding; a star connection method is adopted in the low-voltage winding, and each phase is divided into a low-voltage main winding and a low-voltage voltage adjusting winding which are connected in series; an edge extending triangular connection method is adopted in the high-voltage winding, and each phase is divided into a high-voltage main winding and a high-voltage voltage adjusting winding, wherein the high-voltage main winding is connected in a triangular shape, and the high-voltage voltage adjusting winding is located between the vertex of the triangle and the power source end; each low-voltage voltage adjusting winding is provided with an on-load capacitance adjusting switch, each high-voltage voltage adjusting winding is provided with an on-load voltage adjusting switch, and all the on-load capacitance adjusting switches and all the on-load voltage adjusting switches are independently controlled by a controller. All the windings can be independently controlled, and balance of the output voltage is ensured. The capacity of the transformer is changed through actions of a tap switch, connecting groups are not changed any more, and harmonic waves are effectively eliminated.

Description

technical field [0001] The invention relates to the field of voltage stabilizing power equipment for power transmission and distribution lines below 35kV, in particular to a 36-level high-precision capacity and voltage regulating transformer for power distribution lines. Background technique [0002] In the power distribution line, most of the electrical equipment is not running at full load when it is in use, nor is it running all the time, so the capacity requirements for the transformers of the main electrical equipment do not need to be at full capacity at all times. When the transformer is at full capacity, the no-load loss is relatively large, which will waste a lot of electric energy. Therefore, in order to adapt to the change of load, the capacity is usually reduced at no-load to save electricity. At present, the method of Y-D switching is generally used to change the capacity, and at the same time, the number of turns of the low-voltage winding is changed to achiev...

AI Technical Summary

Problems solved by technology

This method will change the connection group. For large-capacity transformers, it is Dyn11, and for small-capacity transformers, it is Yyn0. When Yyn0 is connected, harmonics cannot be eliminated.

Moreover, this capacity switching method can only switch between two capacities, and cannot be used in places where the capacity fluctuates continuously. Therefore, most of them are currently suitable for farm areas, and the scope of use is limited.

The maximum capacity of this capacity and voltage regulating transformer can only reach 630kVA, the capacity is small, and it cannot be used in larger capacity occasions

Moreover, this kind of capacity-adjusting and voltage-regulating transformer cannot regulate single-phase voltage, and there will be voltage imbalance

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