ELECTRICAL NOISES ARE GENERATED
DUE TO |
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Switching of electrical utilities like
Capacitors, MCCBs, ACBs, etc.
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The inductive loads like Motors, Elevators,
Compressors, Overhead Cranes and Presses.
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Switching equipments like Inverters, UPSs,
SMPS, etc. generate electrical noises due to
switching of Thyristors, Relays, Transistors,
etc.
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Welding systems pollute earthing systems, adds
notches and high frequency noises in the wave
form.
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Lightening, precipitation of static charges
and electrical discharges in the atmosphere
are the natural cause of generation of various
electrical noises.
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EFFECT |
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Electrical noises
are observed to occur over a wideband of
frequency ranging from 1 KHz to 100 MHz
and above. Magnitude is observed to be as high
as 4000 to 6000 Volts in 3 phase supply
system.
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The high
frequency noise can interface with
digitalelectronic equipments causing
untraceable data errors, change of
programme, loss of memory, erratic behavior,
etc.
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The high voltage
spikes can cause the failure of Thyristors or
Transistor, Micro Processors and other
sensitive devices.
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The radiated noise
can interface in operation of remote control
equipment like Cranes, Digital Controls or
Telecom Equipments.
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Isolation Transformer isolates primary and
secondary, or separates neutral-to-ground bond on
the secondary side. It can be used to create
separately derived source to combat current
loops.The Ultra Isolation Transformers are available
in different levels of noise attenuation
capabilities, the most commonly used are 100 & 120
dB. The coupling capacitance between primary and
secondary is direct 1:1 relationship with dB levels. |