The Case of a Residence Community in Fujian

【Basic Information of the Residence Community】

■The community covers an area of 32,000 square meters, including 8 buildings of multi-storey and high-rise.

■The entire community is supplied by 1 power line of 10kV via central transformer substation.
 

【Former Power Supply Planning for the Community】

■The station of electricity transformation and distribution is installed in building 6^#, supplying power to each building by low-voltage cables.

■The community is supplied by 2 oil-immersed transformers, and the radius of low-voltage power supply is about 150 meters on the average.
 

【Integrated Planning for the Community】

■The community is supplied by 1 line of 10kV power to form dry type power supply.

■1 Chinese-type switchyard and 2 Chinese-type transformer substations (outdoor) of 500KVA are installed in the center of the community.

■The radius of low-voltage power supply is about 50 meters on the average.
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[Investment and Operation Comparison of Former Planning with Integrated Planning of Power Supply]
 

Table 1 Comparison of Investment and Losses

1. The percentages in Table 1 are values of data of integrated planning divided by those of the former planning.

2. The total annual operating costs are calculated by 0.5 Yuan per kWh.

3.  Labor costs and installation costs are not included.
 

Table 2 Comprehensive Economic Evaluation of Energy Efficiency for 5-year operating and 10-year operating

NOTE: CI, total investment of all equipments; CP, total costs of losses; CT, total costs of project

       Ratio, the percentage of data of integrated planning divided by those of the former planning
 

■The project costs are 81% of those of the former planning

■The total annual losses and total operating costs are 67% of those of the former planning

■Comprehensive efficiency evaluation of 5-year service: CT values can be saved by 1394489-1071188=323301 (Yuan)

■Comprehensive efficiency evaluation of 10-year service: CT values can be saved by 1795329-1341138=454191 (Yuan)

■The total project costs for 10-year operating are 801238 Yuan, saving 454191 Yuan. Thus, it is possible to recover the investment costs after about 10 years at one time.