Solved Examples on Short Circuit Current
There are some solved examples of calculate short circuit current given by direct method:
Example 1
Find the short circuit current given the pre-fault voltage is 40V and the total impedance is 5 Ohms.
Pre-fault Voltage = 40 V
Total Impedance = 5 ohms
The general formula of short circuit current is given by:
Isc = V / Z
Isc = 40 / 5
Isc = 8 A
The short circuit current is 8 A.
Example 2
If the secondary side voltage of the transformer is 6 V and KVA rating of the source is 30 then, calculate the short circuit current.
KVA rating of the source = 30
Secondary side voltage of the transformer = 6 V
The formula to calculate the short circuit current in transformers is given by:
Isc = KVA rating of the source / Secondary side voltage of the transformer
Isc = 30 / 6
Isc = 5 A
The short circuit current is 5A.
Example 3
A generator has a generator rated current of 20 A and impedance in the short circuit path is 5 ohms then, find the short circuit current.
Generator rated current = 20 A
The impedance in the short circuit path = 5 ohms
The formula for calculating short circuit current in generators is given by:
Isc = Generator rated current / Impedance of the short circuit path
Isc = 20 / 5
Isc = 4 A
The short circuit current is 4A.
Short Circuit Current Calculations
To calculate the short circuit current in a power system we use the basic formula Isc = V / Z where Isc represents short circuit current, V represents pre-fault voltage and Z represents total impedance. In this article we will explore about the short circuit current, steps to calculate short circuit current, and formulas to calculate short circuit current. We will also solve some examples related to the calculation of short circuit current. Let’s start learning on the topic “How to Calculate Short Circuit Current.”
Table of Content
- Short Circuit Current
- Basic Formula
- Types of Faults
- Fault Analysis Methods
- How to Calculate
- Solved Examples