Bender EDS3090, Manual

Page: 16 / 68

System description
16 EDS309x_D00012_03_M_XXEN/11.2014
3.3.1 Schematic diagram EDS system
3.3.2 Test cycle
The locating current pulse cycle has a duration of 6 seconds. The PGH… sends alternating positive
and negative locating current pulses. The sketch below shows the test cycle of the PGH… with the
different switch settings (1, 2, 3) on the device, see schematic diagram above.
EDS195P Insulation fault locator
PGH… Locating current injector
U
n
IT system voltage
PSA… Measuring clamp
R
F
Insulation fault
PE Protective earth conductor
U
n
IT-System
PSA...
EDS195P PGH...
PE
R
F
L2(L-)
L1(L+)
2
3
1
EDS Start
Position
PGH...
1 2 3 3 1
2 sec
4 sec
2 sec
4 sec