IRI1-ER Earth Fault Relay
The stabilized earth fault current relay IRI1-ER serves as a supplement for the transformer differential protection.
It allows for example implementation of a zero-current differential protection by integrating the star-point current (IRI1-ER).
With the view to its higher resistance to disturbances from outside the protection area, it can be set much more sensitively than the simple transformer differential protection, in order to prevent false trippings.
The IRI1-ER can be used as:
Zero-current differential protection of the star point winding (restricted earth fault) of a transformer (IRI1-ER).
Benefits and Key Features
19“ racks – fully withdrawable
Door mounting – withdrawable and sealable
Panel mounting – fully withdrawable
Easy setting software – Smart view
Compact form factor
Protection of power transformers (HV, MW, LV) against internal phase and ground faults as well as external faults.
|Inputs and Outputs|
|Current transformer inputs||1|
|Earth fault protection||50N/51N||•|
|Differential protection: Restricted earth fault||87N||•|
|Housing is withdrawable||•|
|Housing suitable for door mounting||•|
|Housing suitable for mounting plate||•|