Transcript EDON Case Study: Old Transformers Replacement

Science, Research and Development
European Commission
EDON Case Study:
Old Transformers Replacement Groningen saves 1.2 million kWh
per year
Piet Staal
EDON
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About EDON
• Utility company
• North-East Netherlands
• 800,000 clients
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North Netherlands
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Project Groningen 1982
• SAVING ENERGY by replacing old
transformers
• Old transformers still use warm rolled steel
< 1955
• New ones, standard or special design?
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City of Groningen
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Old Transformers
• Constructed before 1940
• Constructed between 1948 and 1951
• Constructed between 1951 and 1955
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Low voltage network
• Meshed network
• Cables in closed loops, double feed
• Transformers in parallel operation
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Transformer peak loading
• Individual between 0,4 and 1,1
• Mean value 0,65
• Load adapted by exchange schedules
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Replacement Programme
Number
KVA
No-load
loss
Load loss
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Old
New
146
74
33,000
23,000
KVA
142
35
KW
587
218
KW
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New design 400 kVA
Type
A
B
C
D
E
F
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Price
Euro
6,236
5,955
6,045
5,909
5,286
4,960
No-load
545
530
540
665
663
640
Load
losses
3,160
3,560
3,300
3,000
3,250
4,000
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W
W
W
W
W
W
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D
T
T
M
D
-A
M
C
H
AA
G
A
C
B
N
N
u
'-c
C
C
N
C
'-a
C
AA
'
-a
AA
'
D
21 TRANSFORMERS PRICE RANKED
Transformerprice Euro
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TOC 1982 normal
high
top
TOC 1999
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Efficiency %
Efficiency year based (%)
97,50
J
0
I
98,00
95
5000
E
98,50
91
10000
84
99,00
F
15000
l
99,50
L
20000
K
100,00
-c
u
25000
l
Price and Total Owning Cost (Euro)
TRANSFORMERS 400 kVA EVALUATED PROJECT GRONINGEN (NL) 1982-1999
at peak load / rated load = 0,6
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Groningen Choice
•Type E lowest total owner cost
•Type C more energy efficient
THE QUESTION IS:
HOW MUCH MORE INVESTMENT
FOR HIGHER EFFICIENCY?
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