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Chapter 2 Electrostatic Fields

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Chapter 2 Electrostatic Fields E-Fields near high voltage and H-fields near high currents: Action at a distance No proven health effects. High E-fields affect ... – PowerPoint PPT presentation

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Title: Chapter 2 Electrostatic Fields


1
Chapter 2 Electrostatic Fields
  • E-Fields near high voltage and H-fields near high
    currents Action at a distance
  • No proven health effects.
  • High E-fields affect the insulation performance
    of insulation materials
  • Must therefore be able to estimate the magnitude
    of E-fields
  • - Uniform and non-uniform E- fields.

2
Fields,Capacitance and Inductance
V
Voltage, V
C
Capacitance
E-Field
Current, I
I
L
Inductance
H-field
3
Uniform Fields
EV/d
  • Field lines and equipotential lines uniformly
    distributed.
  • End effects ignored but uniform fields
    difficult to realise.
  • Rogowski profile

Rogowski E max V/s
End effects
4
Non-uniform Fields
Cylinders
Spheres
Isolated sphere b ?infinity
EaV/a
5
Non-uniform Fields
  • Conductor above plane represented by image
    conductor

6
Capacitance Formulas
7
Bundle Conductors
Equipotential lines
Field lines
8
Grading
Without grading ring
With grading ring
9
Mixed Dielectrics
and
Field lines
Equipotential lines
10
Cylindrical and Spherical inclusions in a
dielectric
?r6
?r1
Field lines
Equipotential lines
11
Cylindrical and Spherical inclusions in a
dielectric
12
Capacitive Coupling
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