Asian Power

Protection Relay


Generator Protection

The high-precision generator differential protection relay MCDGV4 is designed for the protection of medium and large generators. The step-up transformer can be integrated into the protection zone (unit protection). In addition to the differential protection package the device offers pole slip protection, phase distance (backup)
protection and a broad interconnection package (FRT , QV, Reconnection Release) as well as full packages for phase, earth, voltage, frequency and power protection, and many more.

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The generator differential protection relay MCDGV4 is a high precision protection for medium and high power generators. The step-up transformer can be integrated into the protection zone (unit protection/ block protection). In addition to the phase and earth differential protection, the device provides a variety of generator-specific protection functions. The “all-inclusive” package comprises also phase, earth current, voltage, frequency and power protection. In addition to that the device offers an under-voltage directional reactive power protection with reconnection function and an adjustable Fault Ride through (FRT) with AR detection. The intuitive operating concept with plausibility checks and extensive commissioning functions such as the built-in fault simulator allows a safe and time-optimized maintenance and commissioning. The parameter setting and evaluation software Smart view SE can be used consistently across the entire family of devices. The MCDGV4 is available in 384 variants, that cover all combinations of properties that you might need or not need for your application. Each variant is uniquely specified by a typecode of form MCDGV4-2xxxxx (i.e. 5 digits/letters following the ‘-2’). Check the Order Form (depicted below, or in the brochure DOK-FLY-MCDGV4-2E or in the user manual MCDGV4-3.6-EN-MAN) for a complete overview.


  • Comprehensive protection package
  • Interconnection Package
  • Recorders
  • Time Synchronization
  • Commissioning Support
  • Communication Options
  • IT Security
  • Logic equations for protection
  • PC Tools
  • Watermetric Ground Fault Protection


Current Inputs

8 (1 A and 5 A) with automatic CT Disconnect

Voltage Inputs

4 (0 … 800 V, for variants “A” and “B”)
or 4 (0 … 300 V, for variants “C” and “D”)

Digital Inputs

Switching thresholds adjustable via software

Analog Inputs (Type B)

0 … 20mA / 4 … 20mA / 0 … 10V

Analog Outputs (Type B)

0 … 20mA / 4 … 20mA / 0 … 10V

Power Supply

24 VDC – 270 VDC / 48 VAC – 230 VAC (−20/+10%)


All terminals plug type

Type of enclosure


Dimensions of housing (W x H x D)

19“ Flush Mounting:
212.7 mm × 173 mm × 208 mm
8.374 in. × 6.811 in. × 8.189 in
Door Mounting:
212.7 mm × 183 mm × 208 mm
8.374 in. × 7.205 in. × 8.189 in

Weight (max. components)

approx. 4.7 kg / 10.36 lb



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