Continuous monitoring of de-energised loads and conductors
Many types of loads that are temporarily or mainly disconnected (standby mode) must function reliably when needed. This applies, for example, to fire pumps, slide-valve drives, lift motors or emergency power generators.
However, during prolonged downtimes, insulation faults may occur at the supply line or at the load itself due to humidity or other impacts. If these insulation faults are not detected, when connecting the installation the protective device triggers and operation is not possible. In more severe cases, engine fires may occur.
"Offline monitors" can prevent this since they monitor the insulation resistance of de-energised loads in order to report faults at an early stage. Special ISOMETER®s (IR420-D6, IR425-D6, IRDH, iso685 series) are used for this purpose. For this solution it is irrelevant whether the temporarily or mainly disconnected loads are supplied by TN, TT or IT systems.
Continuous monitoring instead of insulation measurement based on random samples during recurrent testing
Avoiding expensive and unplanned system shutdowns
Two-stage reporting minimises risk of fire and injury
Optimised maintenance thanks to early detection
Avoiding operational interruptions and emergency actions
Less damage to property due to defective motors, longer service life
Reducing operating and maintenance costs
Less storage costs for spare parts (motors)
Areas of application
Pumps (sprinkler systems, lifting pumps, etc.)
Emergency slide-valve drives in crane systems (e.g. on ships)
Slide-valve drives in supply lines (gas, water, oil, etc.)