EDS - Expert Diagnostic System - is an Overall Condition Monitoring System designed to monitor the main substation assets: current transformer, voltage transformer, power transformers, circuit breakers, surge arresters and GIS switchgear, which integrates all the real time conditions from all relevant substation assets in a single system.
 Datasheet
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Online Monitoring
Online monitoring systems continuously or periodically monitor electrical installations, networks, transformers, protection and measuring devices, and other components of power supply and distribution systems. They record measurements such as voltage, current, insulation/ground resistance, temperature, leakage currents, harmonics, power values and condition indicators. The aim is early detection of faults, trend analysis, predictive maintenance and enhanced operational reliability and availability.
FAQ
What does “online monitoring” include?
It includes systems and sensors that continuously measure, record and evaluate electrical and operational parameters — e.g. voltages, currents, insulation and grounding state, temperature, leakage currents, harmonics or status of protection and measurement devices.
Why is continuous monitoring important?
Because many faults develop gradually — due to ageing, moisture, overload, temperature variations or operational stress. Online monitoring enables early detection of deviations and targeted maintenance before failures occur.
Which parameters are typically monitored?
Voltage, current, power, temperature, leakage or ground currents, insulation or grounding status, harmonics, transformer or device condition, switching cycles and operational hours.
For which installations is online monitoring especially useful?
Transformers, protection and measurement devices, switchgear, medium- and high-voltage systems, critical loads, UPS systems, industrial facilities, substations — basically wherever high availability and safety are required.
What are the advantages over periodic inspections?
Continuous monitoring enables early error detection, trend analysis, reduced risk of unexpected failure, condition-based maintenance, detailed documentation and often less downtime.
Which technologies and sensors are used?
Voltage and current sensors, insulation and grounding monitors, temperature and humidity sensors, harmonic and waveform analysers, data loggers, smart sensors with digital communication, remote monitoring platforms and SCADA/automation integration.
What is condition monitoring and trend analysis?
Condition monitoring is the continuous measurement of relevant parameters. Trend analysis evaluates these data over time to detect subtle degradation, wear or slow-developing faults before they become critical.
How frequent is the monitoring?
Depends on system criticality — can be continuous, periodic (minutes, hours), event-driven or according to a defined interval. The goal is timely detection of anomalies and prompt reaction.
How are alarms and alerts managed?
By configurable thresholds: e.g. for overcurrent, overtemperature, insulation degradation. Notifications can be sent via alarms, SCADA, email, SMS or maintenance systems.
What to consider regarding data and documentation?
Data must be timestamped, stored securely and archived with history (normal state, events, alarms). Data integrity and availability for audits, maintenance planning and trend evaluation are essential.
When is online monitoring especially beneficial?
For critical infrastructure, high reliability requirements, fluctuating loads, ageing installations, extensive networks or where fast response to deviations is necessary.
Can online monitoring support predictive maintenance?
Yes — by continuous data collection and analysis, maintenance can be scheduled based on actual condition rather than on fixed intervals, improving uptime and reducing costs.
Who should implement and manage online monitoring systems?
Qualified personnel with knowledge of electrical systems, measurement technology and automation. System planning, configuration, data evaluation and maintenance should be handled by trained staff.