Amodis Pamos Generator Partial Discharge Monitoring

POWER AUTOMATIoN AND CONTROLSAMODIS® PAMOS® Generator Partial Discharge Monitoring Hosted by ALSPA Care Supporting your maintenance strategy Optimise power plant operations while remaining alert to high voltage problems caused over time in the stator winding system and along the bus bar. AMODIS® is a modular PC-based plant monitoring and diagnostics system. This system is comprised of several modules for each main power plant component and for the power plant as a whole. Each module can be installed as an independent unit or in combination with any of the others. The partial discharge (PD) monitoring system PAMOS® is one of the AMODIS® modules and is suitable for most generators. This modular PD acquisition and processing system concept allows continuous adaptation to state of the art monitoring technology. The PAMOS® system has been designed to provide early warning alerts to power plant operators of potential insulation-related problems within the stator winding, the part of a generator under the greatest stress, long before a protection system would be triggered. With this monitoring tool, Alstom significantly increases the reliability of power plant diagnostics. It features a design incorporating over 25 years of experience in the area of measurements, analyses and inspections on generators worldwide. The PAMOS® system can be adapted to most generators and does not require modification of the winding insulation for sensor installation. Customer benefits Optimise maintenance plan with early faulty measurement detection Early detection of stator winding insulation deterioration Customised solution based on standardised modules Enhance operational reliability & availability Reduce unexpected outages Decision-making support Long term data trending User friendly interface Cost-effective solution Monitoring natural and abnormal partial discharge by using PAMOS system. TPW/BPROS/PMSMDS12/eng/PAC/06.12/CH/7669 © ALSTOM 2012. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties without ALSTOM’s express written authority is strictly prohibited. Reliable condition assessment Alstom’s reliable condition assessment system utilising PD measurements is based on extensive knowledge of the power generation market. Alstom has developed specific algorithms for automated long-term condition assessment of insulation systems. Over the past 25 years. Detected partial discharges and failures Partial Discharges • Slot and end winding discharges • Inner discharges within voids and cracks • Surface discharges • PD on floating potential Root Causes • Aging of the insulation • Semi conductive coating deterioration • Loose contacts • Broken / damaged support elements • Auxiliary equipment defects • Generator and bus contamination Consequences • Deterioration of insulation components • Unexpected downtimes / outages AMODIS® One monitoring for your complete Plant . Alstom has developed a comprehensive diagnostics database that is comprised of data from a wide range of inspection reports and insulation systems. The data originating from a full set up will provide a clear picture of a power plant’s health status. as opposed to the only area close to the sensor. PD measurements are best complemented with Alstom’s full monitoring system packages and associated diagnostics. The use of this extensive knowledge base and expertise leads to reliable and in-depth analyses for optimising a power plant’s maintenance and reinvestment plan. A local visualisation of the PD activity keeps customers informed about a machine’s actual condition. For a further refined assessment supported by practical operational and maintenance (O&M) recommendations. These data cover a wide variety of designs for machines installed worldwide by diverse manufacturers. which allows in-depth PD detection within the high voltage winding. Alstom provides an extensive knowledge base and expertise for in-depth diagnostics. as well as O&M data. notably in the field of machine designs and material characteristics. High capacitance sensors allow the frequency range below 2MHz to be analysed. For an optimal condition assessment. ambient conditions and mechanical force) is not limited to the first bar of coil of a complete stator winding. electrical field. PAMOS® Satellite . It collects the necessary load condition information from each PD interpretation either directly from the plant control system. or as analogue signals from the Distributed Control System (DCS). Alstom equips its PD monitoring system with sensors of the highest quality to effectively detect any insulation deterioration while providing the most reliable trend condition assessment. with color-coding to make counting discharges convenient. PAMOS® Sensor The stress on the insulation caused by the TEAM factors (temperature. The frequency response will determine how much energy can be detected from the PD signal in the winding system. Alstom uses a high capacitance sensor to ensure high sensitivity not only to PD signals in bars or coils near the sensor. As the PD signals spread throughout the stator winding system. A refined condition assessment is conducted using a phase-resolved pattern. The system features a user-friendly display of the number of discharges and their amplitude at a specific voltage phase angle. The original pulse is distorted and attenuated according to its origin and frequency content. The satellite detects PD activity in up to three phases and the neutral point. but also to those further inside the winding. they encounter several impedance changes. Alstom has developed the PD monitoring system to allow a single computer to collect PD data from several PAMOS® satellites connected. The user can easily select different patterns for analysing distinct PAMOS sensor signals using the AMODIS platform. which provides the PD phenomena information in the required detail.Alstom’s lower frequency range measurement system enables an in depth monitoring of partial discharges within the generator’s entire winding system. The PAMOS® software is designed to provide the most reliable condition assessment trends. Generator with one sensor on each phase plus an additional one on the neutral point for PD measurement PAMOS® Satellite Each generator being monitored is equipped with 4 capacitive sensors to collect and transmit analogue signals to the PAMOS® satellite. which digitalises the collected information and transmits it to the AMODIS® platform. linked up with an AMODIS® server integrated in the power plant’s control room. Enjoy the comfort of entrusting an entire fleet to an experienced original equipment manufacturing Plant Integrator.com/power TPW/BPROS/PMSMDS12/eng/PAC/06. contact your local Alstom representative. These analysis results can be compared to reference benchmarks to detect increases in partial discharge activity. For more information.12/CH/7669 © ALSTOM 2012. The satellite is. All rights reserved. Reproduction. linked up with an AMODIS® laptop. and linking them to a PAMOS® satellite. Permanent PD monitoring This configuration involves installing and connecting PAMOS® sensors with the measuring cables extending to the connection box. value-based decisions in a timely manner. The satellite is. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. Visit Alstom Power online: www. It is provided without liability and is subject to change without notice. enabling the most reliable condition diagnostics assessment. The AMODS server allows the operator to visualise and store the measurements from several installed PAMOS® satellites and other AMODIS® monitoring modules within a plant. Information contained in this document is indicative only. . Remote PD monitoring This configuration involves a monitoring method optimised by connection to an Alstom remote service centre.POWER AUTOMATION AND CONTROLS AMODIS® PAMOS® Existing monitoring approaches Periodic PD monitoring This configuration involves installing and connecting PAMOS® sensors with the measuring cables extending to the connection box. use or disclosure to third parties without ALSTOM’s express written authority is strictly prohibited.alstom. Modular concept of PD acquisition and processing system allows continuous adaptation to state of the art technology in PD analysis. and linking them to a PAMOS® satellite. This configuration allows for intelligent and optimal remote asset management for making economically rational. Additional operational data from the DCS is captured by AMODIS® server for current and historical analyses. This will depend on the technical and commercial circumstances. in turn. which can be taken from generator to generator for periodic on-line measurements. in turn.