Voltage regulating method for autotransformer of distribution box type substation

Abstract

The invention discloses a voltage regulating method for an autotransformer of a distribution box type substation, which comprises the steps that the head end and the tail end of a first winding of each phase of the autotransformer are connected and then connected with the head end or the tail end of an on-load voltage regulating coil through a switch according to the characteristics of an urban distribution network; the tail end of the on-load voltage regulating coil serves as a negative electrode of the phase; the head end of the on-load voltage regulating coil serves as a positive electrodeof the phase; the head end of a second winding serves as a sliding contact to be connected with the on-load voltage regulating coil; each phase of sliding contact is controlled to reach the initial position of the on-load voltage regulating coil, and whether the output voltage of the first winding leading-out end and the output voltage of the second winding leading-out end reach respective corresponding voltage set values or not is judged; if not, a tap position selector of the switch is checked until the output voltages respectively reach the corresponding voltage set values; and if so, the sliding contact is moved to the next tap position until all the tap positions of the on-load voltage regulating coil are traversed.

Description

technical field [0001] The invention relates to a control method and system structure of a power distribution system, in particular to an intelligent distribution box-type power transformation system for urban power distribution networks, which belongs to the technical field of power grid distribution. Background technique [0002] As the power supply area of ​​the urban power grid continues to expand, the line power supply load increases rapidly. The number of connections and segments among the original 10kV power distribution lines in the city is increasing, and the line structure is becoming more and more complex. When the lines with relatively heavy loads reach the peak of power consumption, the switches will automatically trip. In order to adapt to the problem of large voltage fluctuations in the current power grid, it is proposed to adjust the voltage of the ultra-high voltage autotransformer. [0003] For ultra-high-voltage autotransformers whose medium-voltage side ...

AI Technical Summary

Problems solved by technology

When the actual power grid is running, there are transformers with high impedance to low voltage and medium voltage to low voltage. If the main distance is increased to meet the large impedance, this will not only increase the manufacturing cost of the transformer, but also bring transportation problems. It may be that the transformer cannot be transported due to the large size of the transformer and the excessive transportation width, which also makes the design and manufacture of the transformer and power station more complicated

[0006] At the same time, three-phase autotransformers in transformer products in power equipment are regulated through three methods: separate high-voltage voltage regulation, separate medium-voltage voltage regulation, and high-voltage and medium-voltage simultaneous voltage regulation. The above three forms are conventional regulation methods. Voltage mode, but the simple voltage regulation range is narrow, poor adaptability to grid fluctuations, reducing the safety of transformers and grids

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