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Customer Services for Tran sformers
SITRAM
Multisense 9
Monitoring and Diagnostics
Introduction
In their average lifetime of 40 years,
transformers endure various forms of
stresses that can contribute to a
multiplicity of failures (electrical,
thermal, chemical or mechanical).
Transformer failures may cause e.g.
costly damages to primary and
secondary equipmen t, ou tages,
environmental cleanup charges and a
loss of reputation.
DGA (Dissolved Gas Analysis)
monitoring with SITRAM Multisense 9
helps utilities to avoid transformer
failures.
SITRAM Multisense 9 indicates
deviations and imminent faults by
analyzing the co nce ntr at ion of eight
dissolved gases in transformer
insulating oil (mineral and ester oil),
and moisture. This helps to predict and
prevent eight fault types :
• High temperature thermal fa ults,
overheated oil by monitoring C2H4
• Partial discharge, thermal faults,
power discharges, rust, galvanized
parts, stainless steel, sunlight by
Monitoring H2
• Corona partial discharge, low &
medium temperature thermal faults
by monitoringCH4
• Thermal fault involving cellulose,
gradually from oil oxidation by
monitoring CO
• Normal aging, thermal fault
involving cellulose by monitoring CO2
• Hot spot, low energy discharge, high
energy discharge (arc) by monitoring
C2H2
• Low & medium temperature thermal
faults, local overheating by
monitoring C2H6
• Exposure to atmosphere (air), leaky
gasket (under vacuum), air breathing
conservator, leaky bladder by
monitoring O2
Features
• Robust, NDIR measurement
technology without moving parts or
reference gas
• Easy installation directly at
transformer - One man work
• Display and keypad enabling
comprehensive confi g urat ion an d
setup without additiona l computer
• Easy to understand due to simple
setup
• Compact, robust design (IP55)
• High accuracy enabling early
diagnostics
• Option a l : Various comm u nicatio n
options, 13 digital outputs, 5 digital
optocouple r outputs
• Optional: 10 analog outputs, 10
analog inputs
• Ambient humidity: 0-95%
• Monitoring functions:
o Voltage and current monitoring (via
voltage and current tr ansfo rme rs /
transducer)
oTemperature m o ni tor ing : lo we r an d
upper oil temperature, ambient
temperature (via additional
temperature sensors)
o Cooling stage / tap changer position
monitoring (e.g. via current
transducer)
oFree configuration of analog inputs,
free allocation to any additional
sensor
o Calculation of hot-spot (acc. to IEC
60076), loss-of-life, ageing rate
Benefits
• Monitoring of all diagnostic gases
inside the transformer oil, enabling
recognition of all potential failure
types
• Avoidance of major costs due to
failures or outages
• Cost savings thanks to scheduled and
efficient transformer maintenance
• Uses advanced softwa re (the unit
and via PC )
• Maintenance-free system
Scope of work
• Configuration and administration of
each in divid ual M u ltisens e unit
• Data and configuration read-out of
Multis en se un its
• Processing and visualization of data
• Read out (trend or table)
• Online functions (Status and p rocess
flow)
• Diagnostics functions (Duval
triangle)
• Further processing of the data (Excel,
CSV, clipboard and printing)
• Storage of the processed data and
unit config uration
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• A utomatic data read-out and aler t ing
by e-mail
• Standard electrical and mechanical
connection kit, individual mechanical
connection kit on request
• Inst a ll ation f la nge (dif fe re nt
ventilation sizes available)
• On-site training courses for operation
and maintenance for our systems
• Optional: Turnkey installation and
communications se r vices.
• Optional: Expert analysis of
monitoring data and customer
support
Technical Details
Operation Principle
• Miniaturized gas sample production
based on headspace principle
• No membrane, negative p ressure
proofed
• Patent-pending oil sampling system
(EP 1 950 560 A1)
• Near-infrared gas sensor unit for CO2,
CO, C2H2, C2H6, CH4 and C2H4
• Micro-electronic gas sensor for H2
• Thin-film capacitive m oistu re sensor
H2O
• Temperature sensors (for oil and gas
temperature)
• Optional nominal voltages of
auxiliary supply: 120 V AC 50/60 Hz
or 230 V AC 50/60 Hz or 120 V DC or
230 V DC
Range *Accuracy
H2 0 - 10000 ppm ± 5% or ±LDL (whichever is greater)
C2H2 0 - 10000 ppm ± 5% or ±LDL (whichever is greater)
CO 0 - 10000 ppm ± 5% or ±LDL (whichever is greater)
CO2 0 - 20000 p pm ± 5% or ±LDL (whichever is greater)
CH4 0 - 5000 ppm ± 5% or ±LDL (whichever is greater)
C2H4 0 - 10000 ppm ± 5% or ±LDL (whichever is greater)
C2H6 0 - 10000 ppm ± 5% or ±LDL (whichever is greater)
O2 0 - 50000 ppm ± 10 % or ±LDL (whichever is g reater)
H20 0 - 100% ± 3 % or ±LDL (whichever is greater)
* Accuracy quoted is the accuracy of the detectors during calibration
• Power consumption: max. 350 VA
• Housing: aluminum: W 263 x H 263 x
D 327.5 mm
• Weight: approx. 15 kg
• Operating temperature (ambient):
-55°C - +55°C (below -10°C display
function locked)
• Oil temperature (inside transformer):
-20°C - +90°C
• Storage temperature (ambient):
-20°C - +65°C
• Oil pressure: up to 800 kpa (negative
pressure allowed)
• Safety: CE certified, Isolation
Fault gas measurement
SITRAM Multisense 9 is executed in
two steps : gas extraction (headspace
technique) and gas detection (nondispersive infr ared rad iation metho d).
It measures the concentration of
dissolved gases in the oil.
Discover Siemens comprehens ive
transformer monitoring and sensor
portfolio. For more information about
Siemens comprehensive monitoring
package for transformers, please
contact your local partner or our
Customer Support Center.
protection: IEC 61010-1:2010/IEC
61010-2-081, Degree of protection:
IP-55
All rights reserved. Trademarks cited in
this do cument are the propert y of
Siemens AG, its affiliates, or their
respective owners in the scope of
registration.
Subj ect to change with out prior notic e.
The inf ormation in this do cument
contains general d escription s of the
technical op tions availabl e, which may
not apply in all cases.
Siemens AG
Energy Management
Humboldtstr. 59
90459 Nuremberg, Germany
Customer Suppor t Ce nter
Phone: +49 (911) 433 78 78
E-mail: support .energy@ siemen s.com
© Siemens AG, 01.2018, V 1.0
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