Mykolaiv CHP — main building and stack. — Photo: Миколаїв1789 · Wikimedia Commons · CC BY-SA 4.0

Mykolaiv Combined Heat and Power Plant

6–35 kV protection restoration and substation automation reconstruction

Location: Mykolaiv, Ukraine
Date: Withheld — operational security
Category: 6–35 kV CHP

MV/HV distribution: 6–35 kV
plant electrical capacity: 40 MW
protection + automation: Full scope

Project context

Location: Mykolaiv, Ukraine
Date: Withheld — operational security

Mykolaiv CHP is an urban combined heat and power facility supplying both electricity and district heat — roughly 40 MW of electrical capacity and 410 Gcal/h of thermal capacity. After damage and equipment obsolescence had left the 6–35 kV substation in a fragmented state, the project restored and modernised its electrical distribution and automation systems, folding a set of isolated repair tasks into one coordinated protection-and-automation solution.

Scope of work

Restored relay-protection functions on 6–35 kV switchgear and reconstructed the automation required for dependable operation of the substation after damage and equipment obsolescence.
Developed automated circuit-breaker protection and control logic, including trip supervision, breaker-status processing, interlocking and the backup actions required by the switchgear protection philosophy.
Implemented a dedicated automation controller for switchgear control, operational interlocks and sequence handling, providing a consistent interface between field devices and the supervisory control layer.
Reconstructed protection and control circuits across the 6–35 kV substation, including binary signal processing, breaker commands, alarm logic and equipment-state supervision.
Integrated the restored switchgear automation with plant-level control and monitoring, validating indications, commands and alarm transmission between the substation and operator systems.
Supported the broader technical reconstruction of the 6–35 kV substation, combining protection, breaker automation and control engineering into a single coordinated solution.

Engineering contribution

The project transformed isolated restoration tasks into a coherent protection-and-automation system. The emphasis was on operational safety, clear breaker-state logic, dependable trip paths and maintainable control functions across the reconstructed substation.