Service Power Technologies
Partial discharge online monitoring system
Maximizing the system performance
Are you aware of the condition of your
assets?
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.
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 intervention. 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.
The Partial-Discharge Monitoring System
is able to provide continuous monitoring
of substations for partial-discharge
activities, and to create the appropriate
trend analyses.
1 Calibration tool | 2 On-site monitoring system
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Service Power Technologies
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Giving customers best of ABB`s expertise
Fax
e-mail
SMS
Monitoring system architecture
Why Online Monitoring?
A partial discharge (PD) is a clearly localized partial dielectric breakdown in a limited section of an energized electrical
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 measurement 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 properties:
– Ultra High Frequency (UHF) measuring method
– Interference signal / noise suppression
– Phase-resolved partial discharge representation
– A sensitivity level of <5-pC in conformity with the CIGRE
specifications
– Trend analysis
– Data transfer in conformity with IEC 61850
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 substations 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.
Service Power Technologies
Overview of ABB‘s online monitoring
systems
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
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.
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 localization of the point of fault.
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.
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1 Location of sensors | 2 PD-pattern identification
Service Power Technologies
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Lifecycle extension for all assets
The presented PD online monitoring system has primarily
been designed for PD monitoring in gas-insulated switchgear. 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 sensors 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.
Service Power Technologies
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: powertech@de.abb.com
www.abb.com
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)
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