DEIF MDR‑2 Multi‑Differential Protection Relay

Technical Specifications

Model:MDR‑2

Brand:DEIF

System compatibility:Digital multi‑differential protection relay for generator,motor and transformer protection. Supports CT current signals on both sides of protected equipment,works for marine and land‑based genset power‑station,communicates with SCADA system via RS‑485 Modbus RTU.

Function:Microprocessor‑based multi‑function differential protection relay. Measures three‑phase current on both sides of generator,calculates differential current;ratio‑brake characteristic prevents mal‑tripping under through‑fault conditions. Integrated over‑current,earth‑fault,over‑voltage,under‑voltage,frequency protection;2‑line backlit LCD display,local button operation,saves up to 150 historical event logs. Multiple configurable potential‑free relay outputs for alarm and breaker trip command;supports PC configuration software,display module can be installed remotely.

Installation:35 mm DIN‑rail mounting or base screw mounting inside switchgear cabinet,front panel cut‑out mounting available for display unit.

Interface:

‑Screw terminal:CT current measuring input on both sides

‑RS‑485 Modbus RTU communication terminal

‑Potential‑free relay output terminals for alarm and trip

‑Service port for PC configuration

‑Removable front‑panel display module

Circuit feature:Ratio‑brake differential algorithm,surge suppression for CT inputs,1% measuring accuracy,non‑volatile memory for protection parameter storage,event timestamp recording.

Feature:Marine classification approved,fast response time approx 50‑70 ms;multiple hardware option versions for generator only or generator‑transformer block protection;display can be separated and remote mounted.

Diagnostic:Front‑panel LED indicates power,alarm and trip status;LCD displays real‑time measured values and fault event records.

Power supply:8‑36 VDC auxiliary power,typical power consumption 11W

Protection class:IP20 for main body;IP40 for front panel

Horizontal operating temperature:‑25℃ ~ +70℃

Storage temperature:‑40℃ ~ +85℃

Relative humidity:5%‑95% non‑condensing

Shock & vibration:Complies with DNV marine environmental requirement

Weight:0.58kg

Dimensions:144mm ×128mm ×85mm

Certification:DNV,GL,CE,marine type approval

Built‑in function

MDR‑2 multi‑differential relay provides fast internal short‑circuit protection for DEIF generator power‑system. It detects differential current caused by generator winding fault,outputs trip signal to cut off generator breaker rapidly. It also integrates multi‑auxiliary protection,measurement and event‑recording functions. Widely used for marine and land‑based generator protection cabinet spare‑part replacement.

Product Brief

MDR‑2 belongs to DEIF Multi‑Line2 series power‑protection‑system spare‑part family,digital multi‑differential protection relay. Different hardware option versions exist,option function must be confirmed before ordering. Widely applied for power‑equipment maintenance and renovation. ESD anti‑static protection shall be followed during installation.