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3905516
Electrical Supply
Descripción
chap2
Sin etiquetas
introduction to diagnostic imaging instrumentation
Mapa Mental por
nursyasya
, actualizado hace más de 1 año
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Creado por
nursyasya
hace casi 9 años
8
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Resumen del Recurso
Electrical Supply
Principle EM induction
Permanent magnet is moved relative to a conductor/vice versa, an EM force is created.
Wire connected through electrical load, current flow and EMF is generated.
Form of alternating sinusoidal supply.
3 coil on same spindal apart to rotate 120degree will produce 3 phase alternating supply
Sinusoidal waveform
Cycle
Period (T)
Frequency (f)
Amplitude
AC & Voltage
Effective voltage = 0.707peak voltage
Peak voltage use to express potential difference across tube:
same with photon energy emitted (keV)
voltage rating HT cables with compare to kVp applied
Vt=Vpsin2paift / lt = Ipsin2paift
4 principle components:
generating system
by TNB in its power stations
from : coal, hydroelectric
to rotate a turbine engine connected to alternating generator.
transmission system
Step up transformer
long distance transmission
High voltage, smaller current
reduce of copper conductor cross section
local distribution
minimum power loss
delta/star connection
advantages
cheaper, less liability
2 diffenrent voltage
connecting of any xray unit
Permantly fixed
mains isolator
Temporary connection for mobile unit
socket in wards.
Changes in main supply
needs stable in voltage and frequency.
complete stability not archieved
exposure draws a lot of current which produce fall in main voltage
slow variations over long period due to differences in demand
outside xray exposure
rapid variation in short intervals time
Plug & Socket
give maximum possible protection from electrical hazard.
Circuit breaker & fuse
protect xray circuit from damage due to overload.
Electrical insulation
protect against effect of electric shock
amount insulation for cable depend on current
Cable, xray tube, transformer
Earthing
all electric equipment
if breakdown in insulation the conductor will exposed
short circuit would occur
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