Transients in power
supply lines
Prepared by:
Mekala Viswanadh
M.Tech R&M
317206523010
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Transients in power supply lines, Slides of Electromagnetic Engineering
Describes about the various electromagnetic interference in power supply lines.
Typology: Slides
2017/2018
1 / 15
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Transients in power
supply lines
Prepared by: Mekala Viswanadh M.Tech R&M 317206523010
Reasons for transients in power supply lines:
1. Due to less spacing between the conductors.
2. Due to radiation of the electromagnetic
energy from the antenna.
3. Due to the natural phenomenon like lightning.
What are transient voltages and currents?
(cont.,)
(^) Voltage transients normally last only about 50 microseconds. (^) Current transients last typically 20 microseconds according to the ANSI C62.41-1991 which is the standard for transients in facilities operating under 600 Volts. (^) Transients may be of either polarity and may be of additive or subtractive energy to the nominal waveform.
Surges on mains Power Supply
- Transient over-voltages (probably as a result of terrestrial phenomena such as lightning. Radiation from strong radar, radio, or communication transmissions within the vicinity, which are picked up by the power transmission lines. 2. Sudden decrease or increase in the mains voltage (caused by the switching of low impedance loads). 3. Burst of high frequency noise (probably due to switching of reactive loads).
Electromagnetic
Interference
Electromagnetic Interference
(^) Undesired or unintentional coupling of electromagnetic energy from one equipment (emitter) to another equipment (receptor).
2. Conduction coupling
(^) Conductive coupling occurs when the path of interference
between the source and the receptor is formed by a conducting body.
(^) By means of a power cord, interface cables, antenna input
terminals, ground returns, or
(^) Unintentional external conductors such as metallic cases
or housings.
3. Combination of radiation and conduction
coupling
The interference coupling in cable
harnesses, multi-conductor transmission lines and
closely spaced wires on PCB is a result of the
inductive coupling and capacitive coupling.
3.2. Capacitive coupling
(^) Capacitive/electric coupling occurs when the source and
receptor are less than a wavelength apart.
(^) Here the electric field is dominant.
(^) It occurs in the presence of high impedance to ground and
is more predominant at higher frequencies.