Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Petersen coil is used for
Grounding of neutral system
Reduce fault current
Connecting to interconnected system
Shunt compensation of transmission line
Grounding of neutral system
A Petersen coil (or Arc Suppression Coil) is an iron-cored reactor connected between the neutral point of a three-phase system and the ground. It is specifically designed to neutralize the capacitive fault current during a single line-to-ground (SLG) fault by injecting an equal and opposite inductive current.
A Petersen coil (or Arc Suppression Coil) is an iron-cored reactor connected between the neutral point of a three-phase system and the ground. It is specifically designed to neutralize the capacitive fault current during a single line-to-ground (SLG) fault by injecting an equal and opposite inductive current.
ILтАЛ=╧ЙLVphтАЛтАЛ тАФ Inductive current provided by the coil
ICтАЛ=3тЛЕVphтАЛтЛЕ╧ЙCgтАЛ тАФ Total capacitive fault current
L=3╧Й2CgтАЛ1тАЛ тАФ Condition for resonance tuning
During an SLG fault, the system capacitance to ground causes a leading charging current to flow through the fault point. The Petersen coil is tuned such that the inductive current (ILтАЛ) flowing through the coil is equal in magnitude to the capacitive fault current (ICтАЛ). Since ILтАЛ and ICтАЛ are 180┬░ out of phase, they cancel each other out at the fault point, effectively quenching the arc and allowing the system to continue operating without interruption.
Used primarily in transmission networks with voltage levels up to 220 kV.
It converts an earth fault into a self-extinguishing arc.
The system operates in a 'Resonant Grounded' state.
Eliminates the need for circuit breaker operation for transient SLG faults.
Reduces fault current to a very low, non-damaging value.
Increases supply reliability by preventing tripping for transient faults.
Reduces transient overvoltages during arcing grounds.
Requires precise tuning of the inductance (L) based on system capacitance (CgтАЛ).
Cannot handle permanent faults without manual intervention or further protection.
Medium and high voltage transmission lines.
Systems where continuity of supply is critical.
Option B (Reduce fault current) is a secondary effect, not the primary application/device classification.
Option D (Shunt compensation) is usually provided by static capacitors or reactors, not specifically for neutral grounding.
A is correct тАФ The Petersen coil is used for grounding the neutral of a power system to neutralize the capacitive current during a single line-to-ground fault.
Always remember that a Petersen coil is effectively a 'tunable' reactor that makes the system appear purely resistive at the fault location, preventing the arc from sustaining.