Dnister Pumped Storage Power Plant

Dnister PSPP is one of Ukraine's major pumped-storage facilities: its first four reversible units deliver 1,296 MW in generating mode, each rated at 324 MW, with power exported through a 330 kV gas-insulated switchgear installation. Gridradix engineers were brought in under emergency-restoration conditions after impact damage to the high-voltage switchgear and its associated secondary systems. The objective was blunt: recover a dependable protection-and-control chain — from IED logic through field signals to breaker commands — so that critical 330 kV connections could be re-energised safely.

1. 01

   Restored a substantial part of the relay-protection system associated with the 330 kV GIS, covering generator connections and 330 kV transmission-line bays.

2. 02

   Reconstructed damaged protection and automation functions by checking existing circuits, restoring signal chains, verifying IED configurations and rebuilding required control logic.

3. 03

   Configured and commissioned ABB REL650 line-distance protection, Siemens SIPROTEC 4 protection devices and GE Multilin L90 line differential protection relays.

4. 04

   Verified binary inputs and outputs, trip and close commands, interlocks, protection indications, alarm paths and the interfaces between protection IEDs and the station automation system.

5. 05

   Performed functional verification of protection logic and operational sequences for the safe return of restored bays to service — with particular attention to reliable tripping and correct selectivity between primary and backup protection functions.

6. 06

   Supported recommissioning of the automation layer after extensive damage, restoring operational visibility and control for the affected high-voltage equipment.

The work combined high-voltage protection engineering with rapid restoration of secondary systems under constrained conditions. The main objective was to recover a dependable protection-and-control chain from IED logic through field signals and breaker commands, enabling safe re-energisation of critical 330 kV connections.

• Protection coordination All cases — Protection coordination →

Systems & technologies

• ABB REL650
• Siemens SIPROTEC 4
• GE Multilin L90
• 330 kV GIS
• Relay protection
• Station automation
• Binary I/O
• Functional testing
• SCADA signalling

Notes

Public project context verified against Ukrhydroenergo information on Dnister PSPP and its 330 kV GIS.

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