The difference between American and European substation transformer

First, the product structure is different, the components used are different

1. American substation transformer:

1) The wiring form of the box-transformer: one or two 10KV incoming lines; the capacity of a single transformer is generally 500KVA~800KVA; 4~6 low-voltage outgoing cables

2) The main components of the box change: transformer, 10KV ring network switch, 10KV cable plug, low-voltage pile head box and other main components. It has the advantages of small size, low cost and easy installation.

Advantages and disadvantages of American box substation transformer

1) Advantages: small size, small footprint, easy placement, easy camouflage, and easy coordination with the environment of the community. It can shorten the length of low-voltage cables, reduce line loss, and reduce the cost of power supply.

2) Disadvantages: low reliability of power supply; no electric mechanism, no power distribution automation device; no capacitor device, which is unfavorable to reduce line loss; noise is higher than that of I-type station and V-type station, because III-type station and V-type station The transformer is placed in the room to play the role of sound insulation; in addition, the concentrated magnetic radiation of the IIII-type station and the V-type station is decomposed into multi-point radiation; due to the different civil foundations of the box transformers of different capacities, the capacity of the box transformers is increased. Inconvenient; when the box is overloaded or the user increases the capacity, the civil construction needs to be rebuilt, and there will be a long power outage time, which increases the difficulty of the project.

2. European substation transformer:

1) The wiring form of the substation transformer:

a. One-two-way 10KV incoming line for a single distribution variant; the capacity of a single transformer is generally 500KVA~800KVA; the low-voltage outgoing cable is generally 4~6 lines.

b. Two transformers have one-two 10KV incoming lines; the capacity of each transformer is 500KVA~800KKVA; the low-voltage outgoing cables are generally 8~12 lines.

2) The main components of the box change: transformer, 10KV ring network switch cabinet, low-voltage capacitor, low-voltage switch and other main components, which is equivalent to compactly installing the equipment of the III-type station in the metal box, making the I-type station miniaturized. The volume of the European-style box is higher and larger than that of the American-style substation transformer, and the cost is also higher than that of the American-style substation transformer.

1) Advantages: The noise is comparable to that of the type III and type II stations; the radiation is lower than that of the American box-type transformer, because the transformer of the European-type box-type transformer is placed in a metal box to play a shielding role; The advantages of type III station and type II station, but also the main advantages of American box transformer.

2) Disadvantages: The volume is large, which is not conducive to installation, and has a certain impact on the environmental layout of the community;

2. Due to the different structure of the substation transformer, the place where it is used is also different, and the power supply network is also different. Because the structure of the American-style box-type transformer and the European-style box-type transformer are different in reliability, the applicable occasions are also different. When the capacity of the American box transformer is selected to be smaller and the building area of the community is larger, the applied box transformer will increase a lot, so that the load points connected to the overhead line will increase; when the branch load points of the overhead line are reduced It is necessary to increase the number of series connection of the substation transformer, so that the network structure is weak. To overcome the problem of weak network structure caused by the change of small-capacity boxes, it is best to use the ring site to solve it.

1. Applicable places of American box transformer In view of: the structural characteristics and advantages and disadvantages of American box transformer, American box transformer is suitable for the electricity consumption of multi-storey houses and other unimportant buildings with relatively low power supply requirements. According to our actual use, the American box transformer is fully suitable for the power supply needs of multi-storey residential buildings after it is equipped with a small ring network switch station. Because the box transformer fails, it has little impact on the residents, but it is not suitable for small high-rise and high-rise buildings.

2. Applicable places of European-style box transformers European-style cabinet transformers are suitable for multi-storey houses, small high-rise buildings, high-rise buildings and other important buildings.