Cooper Power Systems
Cooper Power Systems
Cooper Power Systems
1
What does the industry think of
when considering fluid-filled
transformers?
Lower Noise
Higher overloadability
Contamination resistance
Higher BIL Fire Safety?
Full diagnostics
Lower temperature
Higher efficiency
Longer Life
Envirotran™
Transformers
The
World’s First
Truly Green
Transformers
With
Flawless Safety!
300
250
Cooper Power Systems:
200
the leader in alternative
150 dielectric fluids
Mineral Oil
Silicone Oil
Envirotemp
R-Temp
FR3 Fluid
Fluid
Flash Point
Fire Point
- Since 1975
R-Temp Fire-Resistant - 30 Years, 250,000 installations 101
Hydrocarbon Fluid - No Reported Fires - NFPA
1
99
Silicone Oil
Cast Resin
Mineral Oil
Envirotran
0.5
VPI Dry
“Liquid is a better
coolant, so winding
temperature rise in a
liquid-filled
transformer is
typically less than half
that in a dry-type
unit. Higher
temperature means
higher resistance.”
Electrical Apparatus
Magazine
Source: ANSI/IEEE C57.12.00 & C57.12.01
August 2005
97 96 95 94
10 Smart Solutions. Reliable Power. Everywhere.
Temperature Noise Losses & Efficiency
Efficiency Contamination
“For the same rating the
BIL Diagnostics
dry-type transformers tend to
Overload Life
be more costly, larger, and
have greater losses than a
corresponding liquid-
immersed unit.”
Oak Ridge National Laboratory
Energy Conservation
Standards for Transformers
kW Losses at 100% loading:
Liquid: Cast: Dry:
LL 16.38 21 18.52
NLL + 2.66 7 7.55
Total = 19.04 26.07 28
89 88
ALSO: transformers losses are dissipated as heat, which
must be removed from a controlled temperature
87
environment by air conditioning. For both examples the
10-year air conditioning cost difference is ~$14,000 86
84
Hartford Steam Boiler
insurance company: 83
the #1 cause for
transformer failure is 82
81
ANSI/IEEE standard
insulation levels are 80
always higher for liquid-
79
filled than dry-type.
78
Source: Liquid-Filled Standard ANSI/IEEE C57.12.00
and Dry-Type Standard C57.12.01. *LV at 480V
77
13 Smart Solutions. Reliable Power. Everywhere.
Temperature Noise Overloadability
Efficiency Contamination
Dry-type transformers are consistently
BIL Diagnostics
oversized since they are unforgiving to
Overload Life
harmonic loading, and intermittent
overloading.
76 75 74 73 72 71 70 69
Survival of these
regular
phenomena are
exactly why
utilities have
been using
liquid-filled
transformers for
decades.
RIGHT SIZE THE
ANSI/IEEE C57.91-1981 Table 5 TRANSFORMER
ANSI/IEEE C57.96-1989 Table 6
68
14 Smart Solutions. Reliable Power. Everywhere.
Temperature Noise Sound Level
Efficiency Contamination
BIL Diagnostics
Overload Life
dB Noise Comparison
kVA Liquid Dry dB Diff
750 58 64 6
67
1000 58 64 6 66
65 1500 60 65 5
2000 61 66 5 64
63 2500 62 68 6
Source: ANSI C89.1 (Liquid) & NEMA TR1 (Dry)
*3dB doubles sound power
Some buildings with dry-type transformers can’t rent the
commercial spaces on either side due to noise. Replacing existing
dry-types with liquid-filled pays for itself in less than one year
avoiding lost revenue
15 Smart Solutions. Reliable Power. Everywhere.
Temperature Noise Contamination
Efficiency Contamination
BIL Diagnostics Dry-Type
Overload Life Maintenance:
annual inspection &
vacuum dust to
maximize cooling
(power down)
Liquid Filled
Maintenance:
62
NONE
Mineral Oil
FR3 Fluid
essentially
prevents coking
ANSI C57.94
and sludging – no
changing the fluid.
16 Smart Solutions. Reliable Power. Everywhere.
Temperature Noise Diagnostics
Efficiency Contamination
BIL Diagnostics
Overload Life Liquid-Filled:
61
Color Dielectric Breakdown Voltage
Dry-Type: 60 Acidity Dissolved Gas Analysis 59
Megger Power Factor Metals Analysis
Power Factor 58 Furan Analysis Inhibitor Content 57
Infra-Red Scan Water Content Interfacial Tension
(de-energized) 56 Specific Gravity Infra-Red Scan 55
54 53 52 51
Operational Properties:
Overheating 50
49 Corona
Arcing 48
47 Insulation Damage
$150 Insulating Fluid Analysis Internal Hot-Spots 46
17 Smart Solutions. Reliable Power. Everywhere.
Temperature Noise Life
Efficiency Contamination According to Hartford
BIL Diagnostics
Steam Boiler insurance
Overload Life
company the causes of
Transformer Killers: transformer failure are:
Voltage Transients 45
External Overloads,
Heat, Dirt, Moisture 44
23
Dimensions
Include Radiators
11 Containment
matched form fit
to transformer
Single source –
10 ships with substation
29 Smart Solutions. Reliable Power. Everywhere.
Envirotemp FR3 Fluid
The First Truly Green Dielectric Fluid
May be Used Indoors and Outdoors
3
Renewable, Recyclable, Nontoxic, Biodegradable
2
Temperature Noise
Efficiency Contamination
BIL Diagnostics
Overload Life
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