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Peterson coil is also known as

Peterson coil is also known as Correct Answer Arc suppression coil

Peterson coil:

  • Peterson coil is an iron cored inductor used to connect the neutral of the three-phase system to the earth. In other words, the neutral of the three-phase system is grounded through the Peterson coil.
  • Generally, this grounding is used to minimize the capacitive charging current during the fault in the lines.
  • This also eliminates the arcing ground, so it is also called an Arc suppression coil.
  • This type of grounding is also known as resonant grounding.
  • The coil is provided with tapping so that it can be adjusted with the capacitance of the system.
  • The reactance is selected so that the current through the reactor is equal to a small line charging which would flow into the line ground fault.

 Connection diagram of Peterson coil for LG fault:

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Let's consider that LG fault has happened at phase C. Then the current flowing through the phase C, IC = IA + IB
The current through the Peterson coil IL = Vph / ω L
Where
Vph = phase voltage of a 3 - phase system, ω is the angular frequency, L is the inductance of Peterson coil
But the fault current IC = 3 Vph / XC
Here, XC is the capacitive reactance and XC = 1 / ωC
Therefore to neutralize the fault current,

IL = IC

Vph / ω L = 3 Vph / XC

=> 1/ω L = 3 ωC

=> L =1/ 3ω2C

Where

C = capacitance of charging capacitor

Thus to neutralize the capacitive charging current, the value of the inductance of the Peterson coil is equal to 1/ 3ω2C.

Advantages of Peterson grounding: 

  • The use of Peterson coil reduces the line interruption due to transient line to ground fault. This is not possible with any other kind of grounding.
  • The tendency of developing a three-phase fault from a single-phase fault is reduced.

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