Analyzing the Advantages and Disadvantages of American and European Box Transformers

Analyze the advantages and disadvantages of American and European box transformers:

Due to their different structures and reliability, American and European box transformers have different applications. The basic situations of the two types of transformer boxes are introduced as follows:

1、 The difference between American and European box transformers:

1. American Box Transformer:

1) The wiring form of the transformer box

One or two 10KV incoming lines; A single transformer with a capacity generally ranging from 500KVA to 800KVA; 4-6 low-voltage outgoing cables.

2) Main components of the transformer box

The main components include transformers, 10KV ring network switches, 10KV cable plugs, and low-voltage pile head boxes. It has the advantages of small size, low cost, and easy installation.

Advantages and disadvantages of American box type transformer

3) Advantages: Small size, small footprint, easy to place, easy to disguise, and easy to coordinate with the environment of the community. It can shorten the length of low-voltage cables, reduce line losses, and also lower the cost of power supply matching.

4) Disadvantages: Low power supply reliability; Without an electric mechanism, it is impossible to install distribution automation devices; No capacitor device, which is not conducive to reducing line loss; The noise level is higher than that of type III and V stations, because type III and V stations place transformers indoors to provide sound insulation; In addition, decompose the concentrated electromagnetic radiation of Type III and Type V stations into multi-point radiation; Due to the different civil foundations of box transformers with different capacities, it is inconvenient to increase the capacity of box transformers; When the transformer is overloaded or the user increases capacity, the civil engineering needs to be rebuilt, which will result in a long power outage time and increase the difficulty of the project.

2. European style box transformer:

1) The wiring form of the transformer box

a、 Single transformer form - two 10KV incoming lines; The capacity of a single transformer is generally between 500KVA and 800KVA; Low voltage outgoing cables generally have 4-6 circuits.

b、 Two transformer forms - two 10KV incoming lines; Two transformers, each with a capacity ranging from 500KVA to 800KKVA; Low voltage outgoing cables generally have 8-12 routes.

2) Main components of the transformer box

The main components include transformers, 10KV ring network switchgear, low-voltage capacitors, low-voltage switches, etc., which are equivalent to compactly installing the equipment of Type III stations in metal boxes, making Type III stations smaller. The volume and cost of European style box transformers are higher and larger than those of American style box transformers.

3) Advantages: The noise level is comparable to that of Type III and Type I stations; The radiation is lower than that of American box transformers because the transformers of European box transformers are placed inside a metal box to provide shielding; Distribution automation can be set up, which not only has the advantages of Type III and Type I stations, but also has the main advantages of American box type transformers.

2、 Due to the different structures of box type transformers, their usage locations are also different, and the power supply networks are also different

Due to the different structures and reliability of American and European box transformers, their applicable scenarios are also different. When the capacity of American box type transformers is selected to be smaller and the building area of the community is larger, the number of box type transformers used will increase significantly, resulting in an increase in the number of load points supported on overhead lines; When reducing the support load points of overhead lines, it is necessary to increase the number of box transformers connected in series, thereby making the network structure weak. To overcome the problem of weak network structure caused by the transformation of small capacity boxes, it is best to use ring websites to solve it.

1. Applicable places for American style box transformers

Given the structural characteristics and advantages and disadvantages of American style transformer substations, they are suitable for power consumption in multi story residential buildings and other unimportant buildings with relatively low power supply requirements. Based on our actual usage, the American style transformer with a small ring network switch station is fully suitable for the power supply needs of multi story residential buildings. Because the box type substation has malfunctioned, the impact on residents is not significant, but it is not suitable for small and high-rise buildings.

2. Applicable places for European style box transformers

The European style transformer is suitable for multi story residential buildings, small high-rise buildings, high-rise buildings, and other important structures.