Economical operation control method for distribution transformers with spare power automatic switching function

Abstract

The invention discloses an economical operation control method for distribution transformers with a spare power automatic switching function. A distribution network system has three operation modes. When the distribution network system is in the control mode, power failure conditions of low-voltage sides of two transformers are detected first, and a relay is used for collecting on-off states of three phases of breakers on the low-voltage sides of the transformers; when any two phases are powered off or the three phases are all powered off, it is judged that the transformers are in a power failure state; then, switching is conducted according to different power failure conditions. In the switching process, firstly, a load is removed from the low voltage side of an original system; secondly, the high voltage on the other side is put into use, then the low voltage is put into use, and finally the high voltage on the fault side is removed. According to the economical operation control method, 10 KV-0.4 KV power distribution devices are combined to be an integral whole and controlled, so that the control difficulty is reduced; switching of the distribution transformers is automatically achieved according to built-in logical functions, so that no-load loss of the transformers is reduced, and economical operation is achieved. The reliability of no-voltage judgment is improved through multi-phase voltage detection, no-voltage faults can be detected more effectively, the quality of electric energy is improved, and the security of electric equipment is protected.

Description

technical field [0001] The invention relates to a distribution network system for segmental power supply, in particular to a method for controlling the economical operation of a distribution transformer (distribution transformer) capable of realizing the function of backup and automatic switching, and belongs to the field of distribution network control. Background technique [0002] With the advancement of science and technology and society, distribution network automation technology has developed rapidly. At the same time, the improvement of people's living standards has also put forward higher requirements for power quality. How to improve the safety, reliability and economy of distribution network power supply system is an urgent problem to be solved, and it is also the direction of distribution network automation. [0003] figure 1 It is a typical medium and low voltage distribution network system in the prior art. Two sets of medium voltage (such as 10KV) incoming ...

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Problems solved by technology

[0005] 1. The 10KV system and the 0.4KV system are managed separately, making management more difficult and requiring different departments to operate, resulting in a waste of human resources

[0006] 2. The detection method of the low-voltage standby self-injection equipment is not perfect. It can only operate after detecting that the three-phase voltage has lost voltage, and there is a certain protection blind zone.

[0007] 3. If the working power of the operable / action equipment fails, these equipment will not be able to operate, which will affect the reliable operation of the entire system

[0008] 4. Only when no power is detected in the three phases A, B, and C of the power distribution system, it will be treated as a voltage loss. The power failure detection mechanism is unreasonable, resulting in damage to the equipment caused by the imbalance of the three-phase power supply

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