620102, Russia, Ekaterinburg, Volgogradskaya Str., 194a


MKPA - local area protection and emergency control system


MKPA is flex logic relay protection and automatic device for high and extra high voltage networks.

MKPA has been designed to control, protect and monitor optional elements of electrical network.

Main functions:

  • Out-of-step protection
  • Frequency protection
  • Over voltage protection
  • Under voltage protection
  • Extra high voltage reactor control automatic
  • Overcurrent line protection and line power control automatic
  • Line commutation control automatic
  • Power transformer commutation control automatic
  • Circuit-breaker failure protection
  • Turn short circuit protection for transformer
  • Voltage circuit control automatic
  • Generator switch off automatic
  • Short circuit power fall detection
  • Any other protection or automatic function


  • Wide diapason ready project solutions
  • Several protection and automatic function on single device
  • Deep disturbance registration
  • Advanced self testing
  • Local and remote control (Device control panel and program for remote control)
  • Advanced flex logic
  • Multiprocessor architecture and vote output circuit
  • Industrial design
Technical Specifications
Analog inputs number32
Analog input sampling rate2 kHz (40 sample/circle)
Logic inputs number*From 24 to 120
Logic outputs number*From 24 to 120
ADC capacity16
Measuring accuracy±0.5%
Maximum measuring current2 A or 10 A
Maximum measuring voltage200 V or 400 V
Supply voltage220 V
Power consumption<350 W
Period of safety work<500000 hours
Electronic block dimensions482×457×267 mm
Terminals block dimensions500×200×120 mm
Cabinet dimensions**800×600×2200 mm

* Total discrete channels quantity mast be less then 144 (both input and output).

** Cabinet dimensions are 800х600х2200 mm if this have glass door.

Organization and principle of operation

MKPA hardware is based on x86 architecture in industrial execution. MKPA can be made as 3-processor device with output vote circuit 2 from 3.

Each MKPA protection or automatic function realized as group of flex logic algorithms that placed in the device. Algorithms use the data that was calculated by analog and discrete acquired values. Any algorithm detecting power network emergency state cause MKPA trip and start disturbance recorder. Remained after MKPA trip record save with its time stamp in nonvolatile storage. Information about trip puts to MKPA run-time journal. Alarm signal about MKPA trip sends to remote control program SignW.


MKPA software consist of controller software that work on device, remote control program SignW that set on personal desktop and flax logic software development kid SoftConstructor.

SignW program permit do following operations: remote configuration of MKPA, saved disturbance analyze, view currently measured signals of MKPA.

SoftConstructor SDK is design for flex logic algorithms creation, editing and checkout. SoftConstructor based of FBD (Function Block Diagram) language and conform to IEC 61131-3.

It were overworked software modules that permit interconnection MKPA and SCADA system by one of following protocols: OPC DA, IEC 60870-5-104, IEC 61850. For time synchronization with SCADA system MKPA use ICMP and NTP protocols.

More then 150 MKPA devices work in Russian Power System in present time.

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