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The Case of a Factory

 

Basic Information of the Factory
■As a manufacturing corporation, the factory covers an area of 70,000 square meters.
■The main loads in workshops are cranes, machine tools and heating furnaces.
■The factory is supplied by centralized transformer substation.
 
 
Former Planning of Power Supply for the Factory
■1 European centralized transformer subtation of landscape type is installed, with transformer volume of 1250kVA.
■Every workshop is supplied by low-voltage cables via centralized box-type substation.
■An oil recovery generator as a backup to supply power to backup unit by low-voltage cables.
■The radius of low-voltage power supply is up to 200 meters around.
 
Integrated Planning for the Factory
■The factory is suppliedy by 4 Chinese-type transformer substations (outdoor), as 1 of 400kVA, 2 of 315kVA, 1 of 200kVA.
■The factory is equipped with 1 Chinese-type solid insulator switchyard of 1 incoming and 4 outgoing.
■An oil recovery generator (320kW) is installed as a backup to supply power to backup unit by low-voltage cables.
■The radius of low-voltage power supply is up to 10 meters around.
 
【Investment and Operation Comparison of Former Planning with Integrated Planning of Power Supply】
 
Table1 Investment and Operating Losses

Project Planning
Costs of High-Voltage and Low-Voltage Equipments
Total Costs of Cables
Total Costs of Project
Total Annual Losses
(Transformers plus Cables)
Total Annual Operating Costs①
10,000 Yuan
10,000 Yuan
10,000 Yuan
10,000 Yuan kWh
10,000 Yuan
A
B
C
D
E
Former Planning
30.3
73.3
103.6
15.7
11.7
Integrated Planning
54.5
33.8
88.3
12.0
9.0
Ratio
180%
46%
85%
77%
77%

NOTE: (1) The percentages in the table are values of data of integrated planning divided by those of the former planning.
    (2) The total annual operating costs① are calculated by 0.75 Yuan per kWh.
    (3) Labor costs and installation costs are not included.
Table 2 Comprehensive Economic Evaluation of Energy Efficiency

Operating Time
5 Years (10,000 Yuan)
10 Years (10,000 Yuan)
Type of Planning
0.75 Yuan per kWh
0.75 Yuan per kWh
Former Planning
(CT=CI+CP)
CI
103.6
103.6
CP
58.5
117.0
CT
162.1
220.6
Integrated Planning
(CT=CI+CP)
CI
88.3
88.3
CP
45.0
90.0
CT
133.3
178.3
Ratio
82%
81%

NOTE: 1. CI, costs of equipments and main materials 2. CP, costs of losses 3. CT, total costs 4. Ratio, the percentage of data of integrated planning divided by those of the former planning
 
From the Comparison above, integrated planning can be characterized as following:
■The total project costs are 85% of those of the former planning, saving 103.6-88.3=15.3 (10,000 Yuan) per year;
■The total annual operating costs are 77% of those of the former planning, saving 11.7-9.0=2.7 (10,000 Yuan) per year;
■The comprehensive efficiency evaluation of 5-year operating costs: CT can be saved by 162.1-133.3=28.8 (10,000 Yuan) (calculated by 0.75 per kWh);
■The comprehensive efficiency evaluation of 10-year operating costs: CT can be saved by 220.6-178.3=42.3 (10,000 Yuan) (calculated by 0.75 per kWh);
■The total project costs for 10-year operating are 88.3 (10,000 Yuan), saving 42.3 (10,000 Yuan).
 
 
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