1. Single variable can easily lead to unreliable power supply
As an important part of the power system, the substation's main function is to receive electric energy from the high-voltage power grid, and then transmit it to the low-voltage distribution network after the step-down transformer to supply various electrical appliances. If only one transformer is installed in the substation, when the transformer fails or needs to be repaired, the entire power supply system will be temporarily cut off, which will have a serious impact on various fields such as industry, commerce, and residents, and even cause major accidents.
And if two transformers are set, when one transformer needs to be repaired, the other transformer can replace its work, ensuring the reliability and continuity of power supply. Therefore, in order to ensure that the emergency treatment is more convenient when the transformer fails or needs to be repaired, many substations will be equipped with more than two transformers.
2, the advantages and disadvantages of the two transformers
However, having two transformers also has some adverse effects. First, both transformers require regular maintenance and overhaul, which leads to higher maintenance costs. Secondly, regular switching is required between the two transformers, and if the switching operation is not performed properly, it will also increase the probability of system errors. In addition, the rated capacity of two transformers will be smaller than that of one transformer, which will lead to higher procurement costs.
To sum up, the advantage of setting up two transformers is that it can improve the reliability and continuity of the power supply system and prevent the risk of the entire system being paralyzed due to a single transformer failure. But at the same time, it increases the system maintenance cost and complexity. Therefore, the substation needs to comprehensively consider the use of a single transformer or multiple transformers to meet the requirements of various electric energy loads under specific circumstances.