power systems analysis phần 6 pptx

ht 1 double-circuit MAGNETIC INDUCTION GMRC 0.54251n i MAGNETIC FIELD INDUCTION Transmission magnetic fields affect objects proximity magnetic fields, related currents ; voltage obj

Aa

0.0556

a

0.0083

„E/km

15U

Example

ca

ht

1

double-circuit

MAGNETIC

INDUCTION

GMRC

0.54251n

i

MAGNETIC

FIELD INDUCTION

Transmission

magnetic

fields affect objects

proximity

magnetic

fields, related

currents

; voltage

objects

considerable

length

fences, prpelines,

phone

wires

magnetic

affected

presence

return currents

presents

equation

computation

mutual

resistance

inductance

which

functions

earth’s

resistivity

balanced

three-phase

systems

return current

Under normal operaung

conditions,

magnetic

proximity

balanced

three-phase

rents

conductors

neglecting

currents

Magnetic

fields

reported

affect

bioed

composition

havior,

immune

systems,

neural functions

There

concems

regard-

biological

effects

electromagneuc

electr

Long-term

effects

suaject

several

dlated

considering

growth,

fields

people

efforts

three-phase

untransposed

transmussion

telephone

supported

same towers

shown

Figure

carnes

60-Hz balanced

current

phase

telephone

Assuming

balanced

three-phase

currents

meter

induced

telephone

From

(4.15)

iinkage

between conduc

below phase

voltage

cai

current

beuween

conductors

134

ELECTRCSIALIC!

ELECTROSTATIC

INDUCTION

Transmission

proximity

increasing

buildings,

comparable

discharges

discharges

transmission

proxumity

representing

conductors

conductor

surrounding

interference

environmental

interterence

configuration

Atinosphene

generation

5

performance

PROBLEMS

FIGURE

Conductor

layout

Problem

three-phase,

transposed

transmission

horzontal

figuration

reactance

conductor

geometric

Determine

three-phase

transposed

159,000-cmil,

inductance

two-conductor

conductors

——>-

‘Dy

m ——

138

TRANSMISSION

three-phase

1,431,000-cmif,

three-conductor

477,000-cmil,

single-conductor

configuration,

b$———_

single-circuit

three-phase

transmission

1,272,000-cmil

configuration

Dy

m—+-—-

D3

mi

= 28

FIGURE

Conduel

140

aa Can

Conductor

CHAPTER

LINE

MODEL

PERFORMANCE

INTRODUCTION

per-phase

parameters

transmission

representation

performance

transmission

operating

conditions

Transmission

represented

equivaient

appropriate

parameters

“per-phase”

expressed

three-phase

equivalent

single-phas

parameters

developed

“medium”

regulation

Operation

conditions

considered,

presented

expressions

distributed

obtained

Propagation

character

impedance

demonstrated

transmitted

approximately

conditions

importance,

equivalent

FIGURE

full-load

Percent

VR

Vaewey|

RL)

Example

146

PERFORMANCE

l

II

It

l

It

regulation

Transmission

/0)(1000/36.879)(10ˆ3)

⁄

121.3929

VR=SS““

148

A=(1+

ta

iv

| Vp [Ya]

(Vs3ph/ats(ABCD(i,i))

er

uF ct

”

150

PERFORMANCE

il

real(Ss)),

1

39.2071

0.000548899

siemens

-3.5251a-07

0.00054595

Percent

voltage

7.30913

Example

zy2abed(z,

commands

-acos(0.95):

Vs3ph/sqrt(3)

Ism*(cos(As)

j*sin(As)):

zy2abcd(z,

Length);

unv(ABCD)*

Vrlr(1);

sgrt(3)*aps

kW(receiving

voltage)

Vrir(2);

1000saps(Ix):

(receiving

current)

cos(angle

angle(Ir)):

%(receaving

factor}

3*Vrtconj

(receiving

power)

152

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