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Simulation of Effect of NER Value on Short Circuit Current and Motor Contribution
Motors contribute greatly to the short circuit currents when phase to earth fault occurs in the power system.
The fault current can be greatly limited to desired value for relay setting discrimination by properly selecting the the NER value.
In this topic we will simulate this action using PowerFactory software.
You can discuss issues related to this post by registering in the forum or contacting me by email or contact form provided here.
Please note that registration process is moderated due to high demand and approval needs confirmation by email.
The model below shows the motor contributing by 329.690 A to phase-earth fault.
The total fault current is 3,643.840 A. Very high.
In this configuration the NER at transformer secondary = 0 ohms.
The fault current can be greatly limited to desired value for relay setting discrimination by properly selecting the the NER value.
In this topic we will simulate this action using PowerFactory software.
You can discuss issues related to this post by registering in the forum or contacting me by email or contact form provided here.
Please note that registration process is moderated due to high demand and approval needs confirmation by email.
The model below shows the motor contributing by 329.690 A to phase-earth fault.
The total fault current is 3,643.840 A. Very high.
In this configuration the NER at transformer secondary = 0 ohms.
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