MKPA microprocessor-based system integrity protection IED is designed to supervise electric power system operating modes and to implement special integrity protection functions.


MKPA is developed for refurbishment and replacement of existing special integrity protection panels in 110 kV and higher voltage class substations. 

MKPA is based on modular industrial controllers and may be supplied both in single unit and redundant modifications. 

MKPA-2 functional purpose is determined by the set of installed algorithms. Each of them implements specific system integrity protection function. All data is calculated on the basis of the signals acquired over binary and analog input channels. In case fault condition is identified, MKPA-2 issues required control signals and records the event. When recording data, MKPA-2 timestamps events, creates and saves waveforms of the specific signals, creates entries in its internal log and sends indications to SignW application.

Key functions

  • Asynchronous mode elimination;
  • Automatic load-shedding;
  • Overvoltage protection;
  • Undervoltage protection;
  • Breaker-failure protection;
  • Voltage controlled load-shedding;
  • Line load-shedding;
  • Pre-fault mode supervision;
  • Power transformer turn-to-turn faults indication;
  • Line tripping identification;
  • Unit tripping identification;
  • Autotransformer closing/tripping identification;
  • Fault severity identification;
  • Additional system integrity protection functions, required by the customer.

Key benefits

  • Ability to implement several special integrity protection functions in a single IED.
  • Large number of standard application projects available at project development stage.
  • Variety of recorded events.
  • Ability to integrate IED in process control system using standard communication protocols: OPC DA, IEC 60870-5-104, IEC 61850.
  • Local and remote control functionality.
  • Processing unit redundancy.
  • High level of reliability.
  • Continuous supervision of the key components.
  • Integrated environment for the development of special integrity protection algorithms.

Key technical characteristics (for each set)

number of analog inputs up to 32
sampling frequency of each channel: 2 kHz (40 samples/cycle)
number of binary input channels*: 24-120
number of binary output channels**: 24-120
DC current upper measurement limits*** ±5 mA, ±20 mA, ±75 mA, ±150 mA
power consumption: not more than 350 W
ADC resolution: 16
analog signals measurement reduced error: not more than 0.4%
rated measured current***: 1 or 5 A
rated measured voltage***: 60 or 100 V
rated power supply voltage: 220 V
MTBF: not less than 50 000 hours
dimensions: 806x2200x60 mm (WxHxD)

User-defined algorithms development environment SoftConstructor software package.

Seismic loads immunity Device is immune to seismic loads of 9 points intensity according to MSK-64 scale for height mark in the range from 0 to 10 meters.

Communication protocols To provide MKPA process control system integration specific software modules have been developed. They provide integration using one of the three communication protocols: OPC DA, IEC 60870-5-104 and IEC 61850- 8-1. Time synchronization is implemented using standard time synchronization protocols: NTP and ICMP.

* Total number of inputs and outputs can’t exceed 144.
** Dimensions of the panel with glass door: 800x800x2000 mm.
*** Required measurement limits are defined at order placement stage.