Page 373 - Contactors_Catalogue
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ABB MOTOR CONTROL AND PROTECTION FOR ROLLING STOCK APPLICATIONS 7/3
07
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Rolling stock
Monitoring relays Insulation monitoring relays
The ABB single- and three-phase moni- The ABB installation monitoring de-
toring relays ensure fault-free, eco- vices maintain the high reliability of an
nomical operation of machines and IT system through constant monitoring
systems. Thus, current and voltage of the insulation resistance. The insula-
monitoring relays for single-phase tion monitoring relay detects insula-
mains can protect devices, machines tion faults at their inception and sig-
and systems against over-/undervolt- nals the non-fulfillment of a minimum
ages or over-/undercurrents and moni- value in good time, before an unex-
tor correct functioning. The three- pected operational interruption can oc-
phase monitoring relays of the CM cur.
series can monitor the phase voltages,
phase sequence and symmetry as well
as phase correction, as necessary.
