Residual Overvoltage Logic; Application Notes; Calculation For Solidly Earthed Systems; Figure 98: Residual Overvoltage Logic - GE MiCOM P40 Agile Technical Manual

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RESIDUAL OVERVOLTAGE LOGIC

VN>1 Voltage Set

VTS Fast Block

VN>1 Timer Blk

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

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

P14D-TM-EN-8

Chapter 10 - Voltage Protection Functions