Capacitor Bank Setting Calculation Guide, Electrical Power

Learn directly from a Global Professional Electrical Engineer with +17 years of Field Experience , Protection & Control


What you’ll learn

  • Capacitor Basics.
  • Phase over current, earth fault and neutral over current displacement relay settings.
  • Voltage rise calculations when capacitor is switched on.

Course Content

  • Introduction –> 1 lecture • 4min.
  • Capacitor Bank Theory –> 1 lecture • 18min.
  • How to Connect Capacitors –> 1 lecture • 13min.
  • How to Connect Capacitors in Capacitor Bank –> 1 lecture • 15min.
  • Advantages of capacitor bank –> 1 lecture • 13min.
  • How to calculate Short Circuit MVA and Current of transformer –> 1 lecture • 8min.
  • How to calculate voltage rise when capacitor bank is switched on –> 1 lecture • 6min.
  • Phase, Earth Fault and Neutral Over Current Relay settings of Capacitor bank –> 1 lecture • 25min.

Capacitor Bank Setting Calculation Guide, Electrical Power


  • Basics of electrical engineering.


In this Section, I have explained how to calculate the relay Settings of Followings.


Capacitor Bank Theory

Series and Parallel Connections of Capacitors & their use in the field

In series capacitance decreases but still, series connections are used in the field?

Advantages of capacitor bank

concept of Current Transformer

What are primary and secondary value means

Do capacitors provide fixed MVAR all the time ??

How to discharge a capacitor, charging and discharging of the capacitor, time constant.

Checking relationship among capacitance, charge, and voltage applied.

Calculation of voltage rise when a capacitor is switched on.

How capacitors are connected in capacitor banks.

discussed unbalance voltage and current protection schemes.

How to calculate phase over current, earth fault, and neutral current displacement relay settings of capacitors.


There are some specific advantages of using shunt capacitors such as,

  1. It reduces the line current of the system.
  2. It improves the voltage level of the load.
  3. It also reduces system Losses.
  4. It improves the power factor of the source current.
  5. It reduces the load of the alternator.
  6. It reduces capital investment per megawatt of the Load.

All the above-mentioned benefits come from the fact, that the effect of the capacitor reduces the reactive current flowing through the whole system.

A shunt capacitor draws almost a fixed amount of leading current which is superimposed on the load current and consequently reduces reactive components of the load and hence improves the power factor of the system.

Series capacitors on the other hand have no control over the flow of current. As these are connected in series with the load, the load current always passes through the series capacitor bank. Actually, the capacitive reactance of the series capacitor neutralizes the inductive reactance of the line hence, reduces, the effective reactance of the line.




Muhammad Kashif

Electrical Engineer