Restricted Earth Fault (64H); Figure 2-6 Restricted Earth Fault - Siemens 7SR242 Duobias Commissioning And Maintenance Manual

2.4

Restricted Earth fault (64H)

Voltage Inputs:
Current Inputs:
Disable:
Map Pickup LED:
The external stabilising resistor value should be measured and compared to that specified in the settings data.
Both values should be recorded.
Element Settings Data: R
64H-1
64H-2
The relatively high value of stabilising resistance R
using a digital test set. It is normal practice in these cases to short circuit the resistor to allow testing, the shorting
link should be removed after testing.
©2010 Siemens Protection Devices Limited
7SR242 Duobias Commissioning & Maintenance Guide

Figure 2-6 Restricted Earth Fault

n/a
I I
G1 , G2
50G, 51G, 50BF
64H-n - Self Reset
Value
STAB
will often interfere with secondary current injection when
STAB
R Measured
STAB
Chapter 6 Page 27 of 57