MRIK3-IE Time Overcurrent/Earth Fault Current Relay with Auto Reclosing and Control Function
The MRlK3-IE digital multifunctional relay is a universal time over current and earth fault protection device with integrated auto reclosing relay intended for use in medium-voltage systems, either with an isolated/compensated neutral point or for net-works with a solidly earthed/resistance-earthed neutral point.
In transmission line networks more than 70% of the occurring faults are transient (electric arcs extinguish, branches are falling on the overhead lines etc.)
With the application of the automatic reclosing (AR) together with protection relays, many electric arcs are extinguished through temporary interruption of the energy supply.
Without utilizing the automatic reclosing (AR) power supply interruptions would occur quite frequently.
Statistics have shown that yet part of the faults remain after the first fast AR can be cleared with a longer 2nd AR interval. The digital multi-shot, three phase auto reclosing relay MRIK3-IE fulfills these requirements for use on medium voltage transmission or distribution systems, by 4-element AR with variable adjustable dead times.
Benefits and Key Features
19“ racks – fully withdrawable
Door mounting – withdrawable and sealable
Panel mounting – fully withdrawable
Fault / disturbance recorder
Display (of primary values)
Easy setting software – Smart view
Compact form factor
Interconnection of renewable energies (DER – distributed energy resources) to the public grid.
Protection of High, Medium and Low Voltage feeders against thermal damages by overload or short circuit currents.
Auto reclosure option to fix short duration faults (like bird flying through overhead lines, ice on lines, lightning’s hitting overhead lines, wind caused arcing by on overhead lines.
|Inputs and Outputs|
|Current transformer inputs||4|
|Time overcurrent protection||50/51||•|
|Earth fault protection||50N/51N||•|
|Circuit breaker failure protection||50BF||•|
|Auto reclosing AR||79||•|
|Fault recorder (none volatile)||•|
|Housing is withdrawable||•|
|Housing suitable for door mounting||•|
|Housing suitable for mounting plate||•|