Partial discharge online monitoring system
Maximizing the system performance
Are you aware of the condition of your
assets?
For gas-insulated switchgear, as they are primarily used by industrial companies, the Service Power Technologies division of ABB Germany has developed an online partial discharge monitoring system (PDM) to continually monitor substations for partial discharge activities and to generate trend analyses in order to be able to assess vital process parameters and thus the current condition of the installation.
The system will inform you early on if there is a need for inter-vention. This way, you will be in a position to implement an enhanced level of reliability and profit from a longer service life of the equipment and, at the same time, contribute to a highly reliable and uninterrupted power supply.
1 Calibration tool | 2 On-site monitoring system
1 2
The proper functioning of substations and their components is a vital factor in
electrical power supply networks and their unimpaired reliability is of paramount
importance.
The Partial-Discharge Monitoring System
is able to provide continuous monitoring
of substations for partial-discharge
activities, and to create the appropriate
trend analyses.
Giving customers best of ABB`s expertise
Monitoring system architecture
Why Online Monitoring?
A partial discharge (PD) is a clearly localized partial dielec-tric breakdown in a limited section of an energized elecdielec-trical insulation system. In gas-insulated switchgear (GIS), PD faults can occur anywhere as a result of a cavity, cracks, particles, or embedded particles.
This condition can lead to unscheduled outages and thus to substantial economic damage. In the worst case, such faults could lead to costly grid failures.
Drawing from our expert knowledge in the field of PD measu-rement and our longstanding experience as a manufacturer of gas-insulated substations, we designed an online monitoring system that is able to combine the following technical proper-ties:
– Ultra High Frequency (UHF) measuring method – Interference signal / noise suppression
– Phase-resolved partial discharge representation
UHF sensors can be attached to any barrier insulator in a gas-insulated switchgear. Retrofitting the online (PDM) system is possible without having to shut down the facility. Our PDM solutions have proven to be successful in subs-tations in Europe, Africa, the Middle East and Asia, both in indoor and outdoor installations.
With the help of integrated analytical software, continuous trends are recorded, and alarms can be forwarded to the control room or load dispatch center using a TCP/IP or IEC61850 protocol.
– A sensitivity level of <5-pC in conformity with the CIGRE specifications
– Trend analysis
– Data transfer in conformity with IEC 61850
Fax e-mail SMS
Overview of ABB‘s online monitoring
systems
Fully automatic monitoring system:
– A UHF sensor is installed for each barrier insulator. – All sensors are being monitored
– Starting from a given level, the system will detect any partial discharge, e.g. from 5pC on.
– Based on the averaged values, a trend curve is calculated online and compared to the alarm levels specified.
– Automatically generated alarms can be transmitted to floa- ting contacts or via an IEC61850 link.
Semi-automatic monitoring system:
– A UHF sensor is installed for each barrier insulator. – A number of selected sensors are monitored. – The rest of the sensors are in stand-by condition.
– Starting from a given level, the system will detect any partial discharge, e.g. from 5pC on.
– If a fault is detected, the stand-by sensors can be included in the fault detection concept.
– Based on the averaged values, a trend curve is calculated online and compared to the alarm levels specified. Automatically generated alarms can be transmitted to floating contacts or via an IEC61850 link.
Mobile monitoring system:
– A UHF sensor is installed for each barrier insulator.
– Regular measurements are carried out on selected sensors using the mobile measuring system and a laptop computer with the necessary software.
– Manual recording of a possible partial discharge and locali- zation of the point of fault.
1 Location of sensors | 2 PD-pattern identification
1 2
ABB can provide the best suited solution for your substation from full-scale
monitoring systems for comprehensive and continual recording of the data to
portable measuring systems for periodic checks
Lifecycle extension for all assets
The presented PD online monitoring system has primarily been designed for PD monitoring in gas-insulated switch- gear. However, with a few adjustments, it can be used for other critical operational equipment as well.
Since the IEC provisions urgently recommend on-site PD testing on GIS up to 170 kV, the importance of monitoring the dielectric condition of a running GIS cannot be emphasized enough. In summary, our online PDM system with UHF sen-sors can provide the following.
Customer benefits
– Subsequent installation while the substation stays on line – Determining the substation‘s fingerprint
– Detecting PD faults in a very early stage
– Providing information on a fault‘s growth rate, severity, location and type
– Cutting unnecessary maintenance activities
– Reducing the number of forced outages, and increasing personnel safety
– Enabling early scheduling of repair work and downtimes. – Facilitating the overall asset management
Enabling early scheduling of repair work
and downtimes.
Contact us
Note:
We reserve the right to make technical changes or modify the contents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail.
ABB AG does not accept any responsibility whatsoever for potential errors or possible lack of information in this document.
We reserve all rights in this document and in the subject matter and illustrations contained therein. Any reproduction, disclosure to third parties or utilization of its contents - in whole or in parts - is forbidden without prior written consent of ABB AG. Copyright© 2012 ABB
All rights reserved
DEABB 1798 12 en
printed in Germany (1112)
ABB AG
Service Power Technologies P.O. Box 10 03 51 68128 Mannheim, Germany Phone: +49 (0) 621 381-30 00 Fax: +49 (0) 621 381-26 45 E-Mail: [email protected] www.abb.com
