Side 4 of 16
Userguide CableTroll 210 March 2020
01021000/11/12/13
1. Introduction
The CableTroll 210 is a fault current detector for the underground medium voltage distribution network
(6-36kV). It is used to detect earth faults according to the functional principles in chapter 3. It can be
installed on most types of cable terminations and suitable for use in tropical weather conditions with
high humidity of 65% to 95%. The CableTroll 210 will indicate earth faults locally by a flashing diode,
and remotely through a relay contact.
1.1 Definitions
As the terminology may differ from country to country, we will throughout this presentation use the
following definitions:
Earth fault: - Single phase to ground fault (PtG)
1.2 Typical Fault Situation
132kV/22kV
22kV/220V
SLEEPING INDICATORS
FLASHING INDICATORS
22kV/220V
22kV/220V
Figure 1. Fault indicator status following a fault
