SIEMONplus – Modular Monitoring
and Diagnostics System for Generators
and High-Voltage Components
Performance Maintenance – Generator
Generators and other technical components are in service
in power plants for many years. Operation and aging
can gradually cause damage to the high-voltage (HV)
­insulation. If changes in the components can be detected
at an early stage under operating conditions through
long-term diagnostics, unscheduled and expensive outages
may be prevented and measures can be scheduled and
taken to extend the service life of generators. For over
20 years, Siemens has implemented systems for monitoring
generators and HV components which ­contribute to the
early ­detection of damage during ­operation.
Our solution
The SIEMONplus monitoring system, which is offered in
two versions, was developed based on these many years’
experience and provides custom solutions for power plant
operators.
The following events can be continuously monitored and
localized during generator power operation:
■■ Partial discharges
■■ Interturn short circuits in the rotor (optional)
■■ Vibrations in stator end windings (optional)
Siemens also offers service packages that include
­enhanced diagnosis and analysis by qualified experts.
Monitored data can be regularly analyzed and evaluated
via secure remote access to allow recommendations to
be made for further operation.
SIEMONplus basic monitoring unit
for wall-mounting
SIEMONplus advanced server
­cabinet
SIEMONplus basic
Impending insulation damage often appears as continuously increasing partial discharge phenomena. This can
be detected, localized and monitored already in its early
stages using radio-frequency measurement methods,
­enabling the initiation of specific measures to ensure
­continued operation.
SIEMONplus basic enables data acquisition, storage and
­visualization of partial discharges as a stand-alone system.
The monitoring unit is available as a solution for wallmounting as a standard (with touchscreen).
SIEMONplus advanced
In comparison with its basic version, SIEMONplus advanced
provides remote access via a central server as well as
­extended visualization and analysis features. The server
enables the integration of multiple monitoring units
­allowing central monitoring of up to twenty generators
or high-voltage components.
Answers for energy.
Changed impacts
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Change in grid codes
Grid instabilities
More flexible
operating mode
More frequent
start/stop ­cycles
Accelerated aging
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Early detection of
impending damage
during operation with:
Loosening of end windings
Degradation of insulation
Friction dust due to vibration
Component fatigue
Reduced residual service life
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Sensors
Data acquisition
Visualization/diagnostics
Alarm function
Analysis by experts
Early detection of operating and aging-induced damages during operation
In addition to partial discharge measurement, the modular system can be ex­
tended with components for monitoring
stator end winding vibrations and
­interturn short circuits in the rotor. This
­provides operators with more comprehensive condition information. A 19-inch
rack design is available as an alternative
to the monitoring unit for wall-mounting.
Features
SIEMONplus systems can be retrofitted for
all generator models.
Pattern analysis and time of flight (ToF)
measurements enable more precise localization of the origin of partial discharges.
Up to 200 coupling units can be installed
and monitored continuously or at regular
intervals for this purpose. The systemspecific configuration enables observing
of not only the generator insulation,
but also of HV bushings, transformer
windings or grounding brushes.
SIEMONplus also enables the integration
of up to 16 fiber-optic accelerometers
for vibration monitoring of generator end
windings and up to two flux probes for
the detection of interturn short circuits
in the generator rotor.
References
Currently, more than 100 generators are
being monitored with Siemens systems.
Your benefits
With SIEMONplus, Siemens offers you
­tailor-made solutions for reliable online
monitoring of generators and high-voltage
components during operation.
Both the basic and the advanced versions
offer the following benefits for your
­generator maintenance:
■■ Potential maintenance cost reduction
due to early and specific condition
­information (condition-based
­maintenance)
■■ Better evaluation of maintenance
­requirements with trend analyses
■■ Optimization of maintenance intervals
and measures as well as service life
of monitored components
■■ Early notification of potential issues
to reduce the risk of unscheduled
­outages.
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Partial discharge measurement and analysis by
Phase-Resolved Partial Discharge (PRPD) pattern
evaluation
High resolution for amplitude and time
(125 MS/s sampling frequency;
4 channels synchronous)
Digital elimination of noise by the use of digital
notch filters and optimization of gain
Measurements in accordance with IEC/TS
­standards 60270, 60034-27-2
Data download via USB stick or SD card
Graphical display of trend data and current
­measurements
Published by and copyright © 2014:
Siemens AG
Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens Energy, Inc.
4400 Alafaya Trail
Orlando, FL 32826, USA
SIEMONplus basic
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Integral monitoring of partial
­discharge (left: PRPD pattern,
right: oscillogram),
rotor interturn short circuits
(left: individual signals from both
poles, right: difference calculation
for each slot) and
end winding vibration
(left: amplitude monitoring
of two frequencies,
right: trend in one frequency)
SIEMONplus advanced
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All functions of SIEMONplus basic
Time of flight (ToF) measurements for better
fault localization
Can be integrated into various higher-level
­diagnostics systems including the Siemens
­diagnostics network
Remote system control and data analysis
Integration of additional modules:
end winding vibration and rotor interturn
­short-circuit monitoring
Extended diagnosis and analysis functions
Central handling of up to 20 SIEMONplus
­monitoring units via a server
Extended alarm and storage possibilities
For more information, please contact
our Customer Support Center.
Phone: +49 180/524 70 00
(Charges depending on provider)
E-mail:support.energy@siemens.com
Energy Service Division
Order No. E50001-G520-A135-X-4A00
Printed in Germany
Dispo 34805, c4bs No. 7816, 7823
TH 258-131162 WÜ 461408 DB 01141.0
All rights reserved.
Trademarks mentioned in this document
are the property of Siemens AG, its affiliates,
or their respective owners.
Subject to change without prior notice.
The information in this document contains
general descriptions of the technical options
available, which may not apply in all cases.
The required technical options should
­t herefore be specified in the contract.
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