NPDG PJSC — Central Busbar Protection Installation Works

Highlights:

Relay protection selectivity improved in response to significant growth of renewable energy sources in NPDG PJSC’s southeastern region, enabling faster fault isolation and enhanced power system reliability
Relay protection upgraded from electromechanical to microprocessor-based technology
Improved sensitivity and fast fault clearance — the core requirements of relay protection
IEC61850-compliant microprocessor relay protection equipment installed at the substation

Works performed:

220 kV Choir transmission line relay protection and automation solution design, installation, testing, and commissioning
110 kV Airag transmission line main protection and automation solution design, installation, testing, and commissioning
110 kV Sainshand transmission line main protection and automation solution design, installation, testing, and commissioning
110 kV Zamyn-Uud transmission line main protection and automation solution design, installation, testing, and commissioning
Power line carrier communication solution design, installation, testing, and commissioning

Solutions used:

RED670 — Transmission line backup protection
REL650 — Transmission line main protection
PVZU-E — Power line carrier post