PKUS SKO Teleprotection Equipment


Protection of HV single-circuit and double-circuit overhead and cable power lines
  • Permissive tripping
  • Direct tripping
  • Blocking

Line protection
  • Distance protection
  • Directional comparison protection
  • High impedance earth fault protection
  • Protection of multi-terminal power lines with single or multiple T-offs

Transformer and shunt reactor protection (direct tripping commands) Breaker failure protection (direct tripping commands) Generator shutdown (direct tripping commands) Emergency control (direct tripping commands)


PKUS SKO is the digital teleprotection equipment for command transmission in relay protection and emergency control systems Up to 16 commands transmission via
  • telecom networks (SDH/PDH, networks based on MPLS technologies, etc.) with C37.94, E1 and Ethernet interfaces
  • direct optical fibers (the distance of up to 240 km, the distance may be increased using optical amplifiers)
  • CWDM/DWDM systems
  • radio links


Command transmission using binary inputs/outputs or/and GOOSE messages according to IEC 61850-8-1 Ed.2 16 binary command inputs, 16 binary commands outputs, 6 alarm and signaling relay contacts

Line interfaces (on request)
  • two electrical E1 (G.703, G.704)
  • two optical interfaces with SFP transceivers: C37.94 or direct optical fiber
  • one electrical E1 and one optical interface with SFP transceiver
  • two electrical Ethernet 100 Mbps

User configurable data rate for teleprotection command transmission
  • min. 64 kbps to transmit up to 8 commands, or 128 kbps to transmit up to 16 commands via E1 or C37.94
  • max. 1984 kbps via E1, or 768 kbps via C37.94

Command transmission time
  • 4.5 ms at 64 kbps
  • 2.9 ms at 512 kbps

Dependability of 10-4 under BER=10-6, Security of 10-40 in worst case
Optional IEC 61850 communication 100 Mbps Ethernet interface with electrical or optical SFP
  • GOOSE and MMS according to IEC 61850-8-1
  • SNTP
  • PRP

Main and redundant power supplies (on request)
  • 48 VDC
  • 110 / 125 VDC
  • 220 VDC / 230 VAC
Nominal binary input voltage (set by jumpers)
  • 48 VDC
  • 110 / 125 VDC
  • 220 VDC / 230 VAC

Configurable pick-up time (0…20 ms, step of 1 ms) to avoid unwanted command transmission in case of impulse interference at the binary command inputs, for example lightning discharges Received commands at the outputs (individually configured by the HMISKO software)
  • prolongation
  • fixed duration

Point-to-point and point-to-multipoint applications
Normal and Inverse T-operation for a protection of power lines with T-offs
Seamless 1+1 path protection (primary and secondary paths) with switchover time of 0 ms
Cyclic (configurable) and Manual (activated via HMISKO software, or optional IPM display panel) Loop test
Addressing facility preventing unwanted operation due to accidental channel crossovers in telecom network
In-operation testing
Optical ports with SFP transceivers (MM or SM; 850 nm, 1310 nm, 1550 nm, xWDM)
Integrated non-volatile and not editable event recorder for command / alarm / manipulation with 1 ms time stamps
Real Time Clock with optional IRIG-B or SNTP synchronization
Diagnostic LEDs for Status and Alarms indication, Link and Hardware Alarm contacts
Two-wire RS-485 / IEC 60870-5-101 and Ethernet / IEC 60870-5-104 for SCADA
SNMPv3 for NMS

Windows® compatible HMISKO software
  • Configuration (on-line and off-line modes)
  • Saved files with configuration, status and event recorder data can be viewed
  • Testing, Commissioning and Maintenance

USB port to connect PC
Ethernet port on the front side can be utilized to remote access to multiple PKUS SKO in parallel via LAN or WAN (this functionality can be on/off via HMISKO when connected locally to the USB port)
Optional external panel IPM with color TFT display and navigation buttons for displaying counters, status and event recorders of the PKUS SKO (without usage of PC)
Operational temperature range: -5 … +550 C
19-inch rack, 1 height units (1U=44.45 mm) or 2U with 1U optional cable tray, overall depth of 365 mm
Weight: 3 kg


Transmission time, dependability and security exceed the requirements of IEC 60834-1 “Teleprotection equipment of power systems. Performance and testing. Part 1. Command systems”
PKUS SKO complies with or exceeds the requirements of international EMC standards
Compact case with a height of 1U=44.45 mm for installation on 19-inches frame
Download device features in PDF

Price request