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ICMobserver – PD Monitoring System

Q: ICMobserver FAQ 4

Yes, the ICM Observer supports: 4 analogue inputs for monitoring environmental conditions (e.g., temperature). 4 analogue outputs for external alarms or other monitoring systems.

State of the art solution for partial discharge monitoring

The ICMobserver is a versatile partial discharge monitoring system that provides everything required for PD monitoring and in-depth condition assessment in one instrument.

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Parallel voltage and PD measurement

The fully parallel PD and voltage measurement allows an instant overview of what is happening within the monitored asset and allows for precise phase comparisons.

Digital signal processing

The digital signal processing of the ICMobserver offers flexible adaptation to site conditions allowing for the best-achievable signal-to-noise ratio.

Full Product Details

About the product

The ICMobserver combines the unmatched quality of the analogue front end of our current PD detectors with the additional features and benefits of the developments in digital signal processing during the last 20 years.

The ICMobserver is a versatile state-of-the-art monitoring system, which combines four devices in one solution: A spectrum analyser, a time domain oscilloscope, voltage measurement, and a PD monitor.
With digital signal processing, the spectrum analyser offers a vast range of possible bandwidths. This greatly improves capabilities to deal with an elevated noise-floor that is often inevitable in on-site monitoring conditions.

The built-in time domain oscilloscope together with fully parallel phase-resolved partial discharge patterns (PRPD) on all channels significantly expands the analysis options, so that you will be able to give an in-depth analysis of the condition of the monitored asset.

The modular concept of the hardware and software ensures expandability of the system for future applications, e.g., dissolved gas analysis (DGA) monitoring and temperature and load surveillance providing one data aggregation point.

FAQ / Frequently Asked Questions

Why is PD monitoring more and more common for MV and HV assets?

Medium and high voltage (MV/HV) assets—such as power transformers, cable systems, and generators—are critical components of any electrical grid. These assets operate under high electrical stress in compact spaces, making them vulnerable to insulation defects that can lead to major failures, costly damage, and prolonged outages. As the transition to renewable energy and the electrification of transportation and heating/cooling increase demand on these systems, the power industry is simultaneously facing a shortage of qualified engineers and rising costs and lead times for new equipment. Studies show that about half of MV and HV failures stem from insulation-related issues, many of which can be identified early through partial discharge (PD) monitoring. The ICMobserver offers a reliable PD monitoring solution that enables early detection of insulation defects, allowing for timely maintenance and repair planning. This not only extends asset life and prevents breakdowns but also helps optimize limited resources, reduce costs, and improve overall grid reliability and efficiency.

What is the difference between ICMobserver and other PD monitoring instruments?

The ICMobserver combines Power Diagnostix’s 30 years of experience in hardware design with the advantages of digital processing. This combination of an excellent analogue front end, together with the flexibility and analysis options of digital signal processing, yields in an unmatched precision and sensitivity.

Which accessories can be used with the ICMobserver?

The ICMobserver can use the established broad range of PD coupling units, cables, and other accessories from Megger PD Aachen to cover most of the possible monitoring situations. Additionally, PD sensors from other suppliers, which are already installed on existing assets, can typically be integrated with the ICMobserver for simple retrofit.

Does the system support external inputs and outputs?

Yes, the ICM Observer supports:4 analogue inputs for monitoring environmental conditions (e.g., temperature).4 analogue outputs for external alarms or other monitoring systems.

What types of assets can the ICM Observer monitor?

The ICM Observer is versatile and can monitor various high-voltage assets, including:

Power transformers
Rotating machines such as motors and generators
Cable terminations

What accessories are required for installation?

The system is compatible with a wide range of accessories, including bushing adapters, bushing coupling units, coupling capacitors, UHF sensors, pre-amplifiers, and DAkkS-certified calibration impulse generators. These can be tailored to your specific monitoring environment.

Is the ICM Observer scalable for future needs?

Absolutely. The system's modular structure allows for customisation and integration of additional features like DGA and load monitoring, ensuring it evolves alongside your operational requirements. Additionally, the software interface can be used to configure and monitor multiple assets from one platform (fleet monitoring).

Does the ICM Observer require regular maintenance?

The ICM Observer and accessories are designed to be maintenance-free.

Troubleshooting

Why is my ICM Observer not detecting partial discharge signals?

If your ICM Observer is not registering partial discharge (PD) signals, it could be due to improper sensor connections or insufficient signal strength. Ensure the coupling capacitors and sensors are correctly installed and securely connected to the system. Also, verify that the PD signal amplitude exceeds the detection threshold. Refer to the user guide for calibration procedures to optimise signal detection.

Why is the noise level too high during operation?

High noise levels can interfere with accurate PD measurement. This commonly occurs due to environmental disturbances or improper grounding. Use noise gating features on the ICM Observer to filter out unwanted signals. Additionally, check that all connections are properly grounded and that cables are kept as short as possible to minimise noise interference.

Why am I not receiving synchronisation signals?

If synchronisation signals are missing, this could result from a faulty or improperly connected cable. Check the SYNC input cables for loose or damaged connections and ensure they are securely crimped. Make sure you’re using the correct bushing coupling units as per your setup requirements. Refer to the manual for synchronisation input configurations.

What should I do if alarm thresholds are triggering repeatedly?

Frequent alarms might indicate improper alarm level settings or actual PD activity requiring investigation. Review the Qp (highest PD value) and NQS (number of discharge pulses per second) thresholds in the configuration and ensure they are configured based on baseline and operational readings. If the issue persists, re-evaluate the asset for potential PD activity or external noise issues.

Why is data from one or more channels missing?

Missing data may indicate a fault in the sensor, cable, or acquisition unit. Examine the channel connections for damage or disruption, ensuring all cables are intact and securely attached to the respective inputs. If issues persist, try running diagnostics through the device’s web interface or consult the user guide for troubleshooting the data acquisition system.

How can I resolve calibration setup issues?

Calibration issues often arise due to loose or improperly connected equipment. Ensure the calibration leads are securely attached and that the calibrator clamps have proper metal contact. Minimise stray capacitance by keeping connections as short as possible. For non-standard configurations, refer to the manual for alternative calibration methods.

Why is the web interface not accessible?

When the built-in web interface cannot be accessed, it could indicate network or firmware issues. Confirm that the Ethernet or mobile communication interface is properly configured and connected. Check the power supply to the unit, and try accessing the interface from a compatible browser. Reboot the device if necessary. If the issue remains unresolved, consult the troubleshooting section in the user manual or contact technical support for assistance.

Interpreting test results

Evaluation of phase-resolved partial discharge patterns (PRPD)

The evaluation of a PRPD pattern enables to evaluate the type and hence severity of a problem. Most partial discharge (PD) faults, such as insulation damages, voids, surface discharges, or floating points, will have a different PD patterns. Additionally, simple trending of PD magnitudes over time and watching for sudden changes offers a straightforward interpretation. Alarm thresholds can be set to notify of sudden changes.

Addtionally, monitoring other parameters such as temperature and loading provide additional insight when evaluating PD monitoring values. The ICMobserver’s built-in web interface stores all information provided such as PRPD, PD trending, voltage measurements, and signals provided via analogue inputs.

FAQ / Frequently Asked Questions

How do I install the ICMobserver for my high-voltage assets?

The ICMobserver is designed for straightforward installation. We offer installation kits for outdoor or indoor use and accessories can be configured based on your specific needs and operational parameters. Installation is detailed in the user guide and installation guides.

How do I access data from the ICMobserver remotely?

The ICM Observer supports remote access and analysis. With its built-in web server, you can log in through a PC or tablet without additional software. If required, the system can include a mobile communication interface (Order no. PX90058) with VPN licenses available for secure remote monitoring and data aggregation.

What maintenance and calibration does the ICMobserver need?

Calibration is only needed once during commissioning of the system unless there are changes in the circuit (for example after a re-wind). The usual on-site calibration charge ranges from 1 nC to 5 nC and involves verifying the setup using impulse calibrators and monitoring background noise levels. Consult the user guide for step-by-step calibration instructions.

What alarm settings should I configure on the system?

The ICMobserver provides two main alarms:

Qp Alarm for instant partial discharge activity exceeding preset levels.
NQS Alarm for monitoring the number of partial discharge events per second.
Set alarm thresholds 30–50% above the baseline levels recorded after installation. Regularly review trends using the strip chart function to ensure alarms remain optimally configured for your asset conditions.

Can the ICMobserver handle noisy environments?

Yes, the ICMobserver integrates advanced digital signal processing with effective noise-gating capabilities to manage environments with high signal interference. Its spectrum analysis feature allows you to select less noisy frequency bands for accurate measurements.

What device can be used to connect to the ICMobserver?

The ICMobserver can be used with any device having a web browser. For a comfortable user experience, we recommend a minimum screen size of 11 inch.

Is an external synchronisation source mandatory?

Often, the high voltage applied to the test setup is not in phase with the line voltage and may not even be the same frequency as the line voltage. In such cases, it is best to synchronise each channel of the ICMobserver with an external signal which is usually derived from the coupling unit but can also be taken from an extra voltage divider. Nevertheless, in the absence of an external synchronisation signal, the ICMobserver automatically synchronises with the frequency of the line voltage of its supplying power (usually 50 or 60 Hz). Therefore, an external synchronisation signal is not mandatory but recommended.