Method and device for intelligently switching on and off transformer set

Abstract

The invention discloses a method and a device for intelligently switching on and off a transformer set, and belongs to the field of intelligent power equipment. The method is characterized by comprising the following steps of: (1) determining the number N of the transformers according to the multiple relationship of maximum load and minimum load, and connecting the N transformers with equal capacitance and equal impedance in parallel to form the transformer set; (2) acquiring real-time electrical parameters by using a data acquisition unit which is arranged on a primary side of the transformer set when the transformer set runs; (3) computing the rated electrical parameters of the used transformers in the transformer set, and computing, comparing and analyzing the real-time electrical parameters and the rated electrical parameters; and (4) inputting the result of the computing, comparison and analysis into a central processing unit, switching on and off the standby transformers in the transformer set by an actuating mechanism which is operated and controlled by the central processing unit according to the result, and cutting off the input standby transformer in advance when the load is reduced. The method and the device are suitable for a place where the load is changed largely, and have the advantages of saving no-load and load loss, reducing outage maintenance, and improving the reliability of power supply.

Description

technical field [0001] The invention provides a method and device for intelligently switching transformer groups according to load conditions, belonging to the field of intelligent power equipment. Background technique [0002] Power system loads, especially living quarters, hospitals, schools, office buildings, and discontinuously operating factories and mines, undergo repeated peak-valley-peak changes every day, and a large amount of electricity is wasted during holidays. [0003] At present, the selection of transformer capacity is basically based on the method of referring to the peak capacity and the simultaneous rate. When the load is low, the operating capacity most of the time is only about a dozen or even a few tenths of the high load. For transformers with large and small capacities, the no-load loss varies greatly, and the load loss is nearly ten times the no-load loss. For decades, in order to save the no-load loss, the transformer has undergone several major mo...

AI Technical Summary

Problems solved by technology

In particular, the operation of changing the capacity of the capacity regulating transformer needs to be carried out in a power outage state. Every time the capacity of the capacity regulating transformer is changed, the user must be powered off. operational factors

[0005] The capacity of these original transformers does not conform to the actual situation, and the adjustment range is not enough. It can only save the no-load loss, and the load loss cannot be saved. The load loss is nearly ten times the no-load loss, and the energy consumption is even greater.

The failure of the transformer cannot be detected in time, and it can only be repaired by power outage, which affects the reliability of power supply and normal power consumption

The losses caused by planned power outages and unprepared sudden power outages are quite different

The load in different periods of the living quarters is very different, and the low load period is much larger than the high load period, which requires a change process for the transformer device, otherwise it is easy to cause huge losses or insufficient capacity, causing the transformer to burn out

In actual operation, the load of each phase of the three-phase power is different, and accidents are prone to occur

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