Figure. 5.6.1 - 159. Broken primary phase current wiring.
In this example, all other condition are met except the residual difference. That is now 0 ×
I
n
, which
indicates a primary side fault.
Figure. 5.6.1 - 160. Primary side high-impedance earth fault.
In this example there is a high-impedance earth fault. It does not activate the function, if the
measurement conditions are met, while the calculated and measured residual current difference does
not reach the limit. The
I
sum
difference setting should be set according to the application in order to
reach maximum security and maximum sensitivity for the network earthing.
A
AQ
Q-C215
-C215
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00040
233