UPAE electric power system node system integrity protection IED is designed for implementation of the following functions:

  • Automatic power system stability
  • Automatic load of power plant
  • Automatic load shedding of power plant
  • Intelligent load shedding.

UPAE is a fully redundant solution which consists of two identical sets, operating mutually in a simultaneous mode. Mutual operation of two sets means their synchronous operation in pre-fault and fault modes, using coherent data to decide on control actions. UPAE may be located either in one 1200 mm panel or in two 800 mm panels. Each set consists of programmable controller, control unit and is equipped with control, signaling and indication elements. Programmable controller implements process control, supervision, signaling and other functions.

Main functions

  • Pre-fault data input and processing
  • Calculation of control actions when local automatic power system stability operation mode is active
  • Operation as a remote controller of centralized SIPS
  • Control at fault conditions
  • Self-supervision
  • Human-machine interface
  • Data communication with centralized SIPS server
  • Process control system integration
  • Generation of warning and alarm signals
  • Events log and fault recording functionality
  • NTP support for time synchronization
  • Unauthorized access protection

Pre-fault data

  • Active power parameters in a form of unified DC signals: -5...+5 mA; 0...5 mA; 4...20 mA
  • Dry contact type binary signals
  • Digital signals, received through Ethernet interface over IEC 60870-5-104 and IEC 61850 GOOSE communication protocols
  • Digital signals, received over remote control systems communication protocols using channel adapters and over Modbus RTU

Main technical characteristics (for each set)

number of analog inputs

up to 32

analog signals measurement reduced error

not more than 0.5%

number of pre-fault mode binary input signals

up to 72

number of fault mode binary input signals

up to 72

number of control output signals

up to 71

number of communication ports for the connection of remote control channels up to 8
number of data sources communicating over IEC 60870-5-104 and IEC 61850 GOOSE up to 32
binary inputs power supply rated DC voltage (Urated) 220 V or 48 V
binary inputs operation voltage 0.75 x Urated
binary inputs current at rated power supply voltage 20 mA
switching current not more than 1 A
consumed power not more than 160 W
system response time not more than 20 ms
control signals table calculation cycle not more than 3 s
average recovery time (replacement of the element) 1 hour
MTBF 100 000 hours

Power supply

220 (+10%, -20%) VDC or 220 (+10%, -20%) VAC, 47–63 Hz


  • 1200x2205x605 mm (WxHxD), when two sets are installed in single panel
  • 800x2205x605 mm (WxHxD), when each set is installed in individual panel

Operating temperature


Software based on QNX Neutrino 6.5.0 real-time operating system

  • Monitoring and control
  • Settings editor
  • Mimic diagrams editor
  • Events log overview
  • Virtual stend software simulator supply is possible on request. Simulator is designed for UPAE configuration and algorithms testing without real equipment

Monitoring and control software for Windows OS

  • UPAE operation monitoring
  • Electric power lines, circuit-breakers, disconnectors state control
  • UPAE operation report generation
  • UPAE malfunctions report generation

Description of the UPAE.

The UPAE can be operated within the following context:

  • UPAE per se, composed of two subsets
  • UPAE test bench – this is a device intended for generation and registration of active power signals, binary signals of line status and detector malfunctions, initiation signals signals, CA outputs actuation registration
  • The test bench includes a RES-3 emergency events recorder and a GIS test signal generator. The test bench serves for simulation of a facility under control and is used to check the hardware`s operability and the UPAE`s proper functioning during the SIPS system`s maintenance
  • UPAE marshalling cabinet – this is a switching device that serves for switching the UPAE`s input and output circuits from the control facility`s devices to the test bench
  • Auxiliary relays cabinet – this is a device that serves for sending UPAE`s CA signals over distances exceeding 1 km. The cabinet may include both electromechanical and solid state relays
  • Control engineer`s workstation – this is a workstation that runs station-level software, which ensures the UPAE`s real-time monitoring and control (subject to having the control engineer`s access rights)
  • Process engineer`s workstation – this is a workstation that runs station-level software, which ensures the UPAE`s real-time monitoring and control (subject to having the control engineer`s access rights), as well as allows to change the UPAE configuration`s original values
  • Test bench workstation – this is the workstation that holds the test bench`s management tools: application for editing and transmission of tasks for the test signal generator, oscillograph records viewer
  • LAN infrastructure – this is the hardware and software environment that ensures the data exchange between the components under the TCP/IP protocol at a speed of at least 10 Mbit/s
  • Centralized SIPS server – this is a remote supervisory computer control system that is connected to the LAN infrastructure via machine-to-machine communication channels that allow data transmission under TCP / IP with a bandwidth of at least 64 Kbit/s

Description of the UPAE