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Selection points of oil-immersed transformer

Release time:2020-08-24 14:39:55     The number of clicks:318

Load nature

1) When there are a large number of primary or secondary loads, two or more transformers should be installed. When any one of the transformers is disconnected, the capacity of the remaining transformers can meet the power consumption of primary and secondary loads. The primary and secondary loads should be concentrated as much as possible and not too scattered.

2) When the seasonal load capacity is large, a special transformer should be installed. Such as the air-conditioning chiller load and heating electric heating load in large civil buildings.

3) When the concentrated load is large, a special transformer should be installed. Such as large heating equipment, large X-ray machine, electric arc furnace, etc.

4) When the lighting load is large or the power and lighting use a common transformer seriously affects the lighting quality and bulb life, a special lighting transformer can be installed. Under normal circumstances, power and lighting share a transformer.

Use environment

Under normal medium conditions, oil-immersed transformers or dry-type transformers can be selected, such as industrial and mining enterprises, agricultural ** or attached substations, residential ** substations, etc. The available transformers are S8, S9, S10, SC(B)9, SC(B)10, etc.

Temperature environment

① Maintain long-term stability at 220℃

②It can withstand short-term operation at 350℃

③Maintain stable performance in a wide range of temperature and humidity

④At 250℃, it will not melt, flow and support combustion

⑤No toxic or corrosive gas will be released at 750℃

Electricity load

1) The capacity of the distribution transformer should be integrated with the facility capacity of various electrical equipment to obtain the calculated load (generally excluding the fire load). The apparent capacity after compensation is the basis for selecting the capacity and number of transformers. The load factor of a general transformer is about 85 percent. This method is relatively simple and can be used to estimate capacity.

2) In GB/T17468-1998 "Guidelines for Selection of Power Transformers", the recommended capacity selection of distribution transformers should be based on GB/T15164-94 "Guidelines for Loads of Oil-immersed Power Transformers" or GB/T17211-1998 "Dry Type Power Transformer Load Guidelines" and calculate the load to determine its capacity. The above two guidelines provide computer programs and normal cycle load diagrams to determine the capacity of distribution transformers.

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