Hotel electrical installation capacity: 2 105KW. What transformer should be selected and calculated according to what formula?

1. It is necessary to calculate the calculated load according to different types of loads.

Main categories: lighting, electricity and others.

For example, in high-star hotels, general lighting accounts for 30%, electricity (mainly air conditioning) accounts for 60%, and others account for 10%.

Different loads have different demand factors and power factors, and sometimes simultaneous factors and load rates should be considered.

2. According to the installation capacity provided by the owner:

Installation capacity of lighting load = 2105 * 0.3 = 631.5kw, estimated cos=0.9, and demand coefficient K=0.9.

Power load installation capacity =2 105*0.6= 1263KW, estimated cos=0.7, and demand coefficient K=0.8.

Installation capacity of other loads = 2105 * 0.1= 210.5kw, estimated cos=0.9, and demand coefficient K=0.7.

Calculation:

Calculated lighting load = 631.5 * 0.9/0.9 = 631.9 (kva)

Dynamic calculation load =1263 * 0.7/0.8 =1105.13 (kva)

Other calculated load = 210.5 * 0.9/0.7 = 270.64 (kva)

Total calculated load = 631.9+105.13+270.64 = 2007.67 (kva)

3. Considering that the load rate of transformer should be around 0.8.

Transformer capacity to be selected =2007.67/0.8=2509.59(KVA)

Because hotels usually supply power for Class I and Class II and need low-voltage dual power supply, therefore,

Choose two transformers, each of which is 1250KVA.

(The above only provides ideas, and the process is not necessarily rigorous for reference. )