Figure 234: Residual Overvoltage Logic - GE MiCOM P40 Agile Technical Manual

Single breaker current differential (with distance)

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Table of Contents

Chapter 14 - Voltage Protection Functions

RESIDUAL OVERVOLTAGE LOGIC

VN>1 Voltage Set

VTS Fast Block

VN>1 Timer Blk

Figure 234: Residual Overvoltage logic

The Residual Overvoltage module (VN>) is a level detector that detects when the voltage magnitude exceeds a set

threshold, for each stage. When this happens, the comparator output produces a Start signal (VN>(n) Start), which

signifies the "Start of protection". This can be blocked by a VTS Fast block signal. This Start signal is applied to the

timer module. The output of the timer module is the VN> (n) Trip signal which is used to drive the tripping output

APPLICATION NOTES

CALCULATION FOR SOLIDLY EARTHED SYSTEMS

Consider a Phase-A to Earth fault on a simple radial system.

P54x1i-TM-EN-1

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