EDS470 - Bender

1 General
One determining factor for the availability of an electrical installation is the
insulation resistance. It is first on the list of items to be considered with regard to
electrical safety. This applies generally and regardless of the type of distribution
system.
Planning the installation of a safe, reliable power supply aiming the highest
availability means:
• Set-up of the power supply as IT system. In comparison with a
distribution system with intentional earth connection of the active
conductors, an improved operating reliability, improved fire protection,
improved accident prevention as well as a higher permissible earth
resistance are thereby achieved.
• Use of the suitable insulation monitoring device. The advantages named
in the previous paragraph stand or fall by the selection of the appropriate
A-ISOMETER for the respective application. The advantages of the IT
system cannot be used without a reliable monitoring system. A desired
high level of the insulation resistance cannot be maintained in the long
term without continuous monitoring.
• Reduction of maintenance costs and downtimes thanks to the installation
of an insulation fault location system. The quick localisation of an
insulation fault immediately after it occurred is a long-cherished wish of
the maintenance personnel. Without interruption and possible night and
weekend work, the fault is located and indicated. The actual repair work
can be carried out at an appropriate time.
For the reliability of the power supply, it is decisive to maintain the good state of
insulation. This is only possible by means of suitable monitoring devices. These
devices cannot prevent insulation faults or the deterioration of the insulation.
However, maintenance is considerably simplified by an early and quick
detection with indication of the fault location.
In the past, fault location often was time-consuming and complicated.
Frequently, weekend work was necessary to localise the fault with the
installation shut down.
The modern EDS470 insulation fault location system resolves these problems.
Thanks to the automatic localisation of the insulation fault, the necessary repair
becomes very simple, the required high insulation level is maintained. Fault
localisation is carried out during operation, it is not necessary to shut down the
system.
For setting up a power supply as IT system, the relevant regulations (IEC364-4-
41, DIN VDE 0100 T. 410) require that as soon as the first insulation fault occurs,
it must be eliminated as quickly as possible. These requirements can be met by
means of the insulation fault location system EDS470. Thus, the risk of an
interruption of the power supply due to a possible second fault is significantly
reduced.
EDS470 is an open modular system. For this reason, it can at an optimum be
adapted to the individual conditions of the system. Later extensions are very
simple and require only few devices and set-up work.
4
TGH 1243E/02.2000