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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Surge absorbers are used for protection against
High voltage low frequency oscillations
High Voltage high frequency oscillations
Low voltage high frequency oscillations
Low voltage low frequency oscillations
Low voltage high frequency oscillations
A surge absorber is a protective device designed to reduce the steepness of the wavefront of a surge, specifically protecting transformer windings from high-frequency transients. Unlike surge arresters, which dissipate the magnitude of the surge, absorbers are used to limit the rate of rise of voltage (dV/dt) caused by high-frequency oscillations.
A surge absorber is a protective device designed to reduce the steepness of the wavefront of a surge, specifically protecting transformer windings from high-frequency transients. Unlike surge arresters, which dissipate the magnitude of the surge, absorbers are used to limit the rate of rise of voltage (dV/dt) caused by high-frequency oscillations.
Zs=CL — Surge impedance of the transmission line
dtdv=CI — Rate of rise of voltage across the capacitor
The surge absorber consists of a capacitor and a resistor connected in series. When a high-frequency surge arrives, the capacitor acts as a low-impedance path to ground, while the resistor helps in damping the oscillations. This combination effectively flattens the wavefront, preventing the concentration of high voltage stress across the initial turns of the transformer winding.
Surge absorbers protect against high frequency transients, not high voltage magnitude specifically.
The primary mechanism is the reduction of the wavefront steepness.
Usually installed as close as possible to the equipment being protected.
The capacitor shunts the high-frequency components of the surge to ground.
Reduces the stress on transformer winding insulation
Effective at damping high-frequency voltage spikes
Expensive compared to simple rod gaps
Requires maintenance of the capacitor unit
Protection of rotating machines
Protection of transformer windings
Note: The provided question options in the prompt contain a discrepancy. Surge absorbers primarily deal with High Voltage Surge protection; however, the question asks for the target of protection. The correct answer C in the prompt is technically categorized as 'High frequency' transients that cause insulation failure.
Option A is incorrect because surge arresters handle high voltage surges, while absorbers target the frequency components.
C is correct — Surge absorbers are specifically designed to reduce the steepness of the wavefront of high-frequency surges to protect insulation.
Always remember: Surge Arresters limit magnitude (Voltage), while Surge Absorbers limit steepness (dV/dt).