Тусгай объект
RZA LLC, in cooperation with the National Transmission Center (NTC) and the National Dispatching Center (NDC), successfully conducted a large-scale technical study and audit to improve the reliability of relay protection and automation systems within Mongolia’s integrated power grid. Based on the findings, the protection systems were subsequently upgraded and modernized in phases.
Within the framework of this work, the following activities were carried out:
Assessment of the current condition of relay protection systems in substations and power plants
Identification of outdated and deteriorated equipment
Analysis of operational reliability and selectivity performance
Comparative evaluation against international IEC standards
A team of professional engineers conducted comprehensive on-site measurements, testing, schematic verification, and fault event analysis. This allowed for a clear identification of system weaknesses and areas requiring improvement.
Many nodes of Mongolia’s power system were previously equipped with electromechanical and early semiconductor-based relay protection systems installed during the Soviet era. These systems had the following limitations:
Lower accuracy
Slower response times
High maintenance requirements
Scarcity of spare parts
Limited compatibility with modern digital systems
As a result, they no longer met the requirements of modern power system operations.
Based on the audit results, RZA LLC implemented a full modernization of relay protection systems using state-of-the-art microprocessor-based protection technologies, including:
Installation of digital relay protection devices
Integration with SCADA and IEC 61850 automation systems
Implementation of high-speed protection algorithms
Enabling fault recording and disturbance analysis capabilities
High precision: Improved fault detection accuracy
Fast operation: Millisecond-level response time
Multi-functionality: Integrated distance, differential, and overcurrent protection within a single device
Data recording and analysis: Ability to store and analyze fault and disturbance data
Remote monitoring and control: Real-time supervision from dispatch centers
This modernization represents a significant technological transition from Soviet-era relay protection systems to modern microprocessor-based solutions, marking a new era in Mongolia’s power sector.
This transition has:
Significantly improved system reliability
Enhanced fault containment capabilities
Reduced human intervention through increased automation
Established infrastructure aligned with international standards and requirements