Page 88 - Transformers Full Line

D
ONGAN
E
LECTRIC
M
ANUFACTURING
C
O
. • 2987
F
RANKLIN
D
ETROIT
,
MI 48207
800.428.2626 • 313.567.8500 •
F
AX
313.567.8828 •
w.dongan.com
86
Watts =
Volts
2
Ohms
Watts =
Amperes
2
x Ohms
Watts =
Ohms =
Volts
Amperes
Ohms =
Volts
2
Watts
Ohms =
Watts
Amperes
2
(
Volts) (Amperes)
(
Ohms) (Watts)
V I
R W
W x R
V
R
I x R
W
R
W
V
V
2
R
I
2
x R
V x I
V
2
W
V
I
W
I
2
W
I
Volts =
Volts =
Volts =
Amperes x Ohms
Watts x Ohms
Watts
Amperes
Amperes =
Volts
Ohms
Amperes =
Watts
Volts
Amperes =
Watts
Ohms
3* ;!
< $= -! # 7 -!* 5!
Volts
Amperes
Ohms
Watts
3*
>! < . !
To Find
Single
Phase
Three Phase
3
or 4 Wire
(
Phase to Phase)
Three Phase
4
Wire Wye
(
Phase to Neutral)
Amperes when
kVA is known:
kVA x 1000
V
kVA x 1000
V x 1.73
kVA x 1000
V x 3
Amperes when
Horsepower is known:
HP x 746
V x %Eff. x PF
HP x 746
V x 1.73 %Eff. x PF
HP x 746
V x 3 x %Eff. x PF
Amperes when
Kilowatts are known:
kW x 1000
V x PF
kW x 1000
V x 1.73 x PF
kW x 1000
V x 3 x PF
Kilowatts:
I x V x PF
1000
I x V x 1.73 x PF
1000
I x V x 3 x PF
1000
Kilovolt Amperes:
(
kVA )
I x V
1000
I x V x 1.73
1000
I x V x 3
1000
Horsepower:
I x V x %Eff x PF
746
I x V x 1.73 x %Eff x PF
746
I x V x 3 x %Eff x PF
746
Watts:
V x I x PF
V x I x 1.73 x PF
V x I x 3 x PF
Power Factor:
kW
kVA
kW
kVA
kW
kVA
Volts
x Amperes
General Heating Formula
KW =
Wt. of material (lbs.) x specific heat x temp rise °F
3412
x heat-up time (hours)
Tempaerature Conversion Formulas
°C =
5
9
(
°F - 32 )
°F =
9
5
(
°C + 32 )
I = Amperes
V = Volts
kW = Kilowatts
HP = Horsepower
%
Eff. = Percent Efficiency
PF = Power Factor
kVA = Kilovoltamperes