Class notes for ECEN 338 Power and Energy

Do can lot be transmitted as far without losing
Power. At can be stepped up down easier.


P = Vol fer the same lower ,
more voltage = less
P =
=
-
R corioni = less loss.
P =
vi
T
High current requires thicker cabies


Ruire = P .
E P = /eSiSiNay L = lengin A Area
Energy = P . T


reduces resistivity but
Thicker cross-section area ,




COSTS More

Edison : Of
transmissich ,
lightbulb
Tesla : AC , MOTNs

Antio Pacinoiti : transformer

W



⑮ bi

Vload = 100 . s
= 66 6/
.




Vratio = 66 . 67
66 6 % %.
Too = .




Energy consumed
in 10 nours = 20 = 44 44
. kWH

load resistance if Ve is Do less Than 10 % difference from V.
· 9
= R= 4. 5r

, :
Generation 12-35k High : 69-230k
Transmission : etia high :
11S-1500 kv 345-963kV
Gird nigh
Distribution : 4-35kv 1100 -
1500Kv
high OC : 100 -
500k


Transmission systems :




Oreihead - Cheapest and most efficient

undergrand -
extensive ,
calacitance looblems

Load factor : loady
Average
Peak load . 24


Demand factor : Mex demonst
-


Total demand
diversity factor :
ofMardemanda
Sun
-




Factor
den
Calacay
trage
: see


↓



· V= Umax Sin + Umax = Amplitude o Inf = 377
arms = Umat
Vi = Umax
-

T2
·
(os) w out ++

·
P(i) = Ema + Imax)(cos(on-Oil +os(2WitOr+ Oil)
2= & In = iWL Zc = The

, kuk Purely inductive Purely calcite
Priely resiste
Current lays by go" current leads by 90
↑ aua = Vrms I/msCOs (Or Oi
· -


Pf = cost
① Or-OE
O = Tan" (*)
Average power of a lovely inductive or capacitive
load is zeo .


O2 :

Oy =
Jan"(el
Tan"

P + ic
(f)
complex Power
2 =
x X reacnset




S

cose
mitanceto
= =


0= feas Power VimsIrms =

susceptancea
Q = leacive Power (imaginary) +
= ViasIrms Sing 6 conductance

ex . for a system with Voltage 100430 and
current 10400 Find complexpower
-
. Octermine
if supplied or absorbed.
O




Er
100T48 . 1000 = 1000420 = -
500 + 866 .
08 %

absorbed