hydro media media center dia tech caa 03 e 1
TRANSCRIPT
8/9/2019 Hydro Media Media Center Dia Tech Caa 03 e 1
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sustainable solutions. for a better life.
www.diatechsystems.com
VA TECH HYDRO
Smart Module to assess surface partialdischarge of windingsconsisting of:
Control-, acquisition- and diagnosis softwareCooling air sample measurement systemOzone analyzer
damage in the stator winding area. PD
produces ozone and its concentration can be
measured by taking air samples from the
generator cooling air circuit.
The advantage of this method is:● the simplicity of the installation (only
hoses are to be installed)● the simplicity of retrofitting at existing units● the dielectric monitoring of the entire
winding system with one single
measuring-point.
DIA TECH CAA-O3 – COOLING AIR ANALYSIS – OZONE DIAGNOSIS
The Cooling Air Analysis module (CAA)
consists of two independent sub-modules,
the “hotspot-detection” (HS) and the
“ozone diagnosis” (O3). Both modules are
based on similar measurement methods: air
samples are taken from the generator coolingair circuit allowing measurement of the con-
centration of certain gas contents or of ozone,
which are emitted from various insulating
materials under certain conditions. The air
samples are transferred through Teflon®
hoses to suitable analyzers, which determine
the concentration of the particular gas.
The results are transmitted to the DIA TECH
system for further diagnostic processing.
One single hose per generator and per
module (HS/O3) is sufficient. At least onemore hose is necessary to measure the
ambient conditions in the power house for
reference.
DIA TECH CAA-O3
makes assessment of insulation condition by
analyzing its surface partial discharge (PD)
activity. Surface PD informs about dirt,
changes of potential gradients, and insulation
Scheme of Cooling Air Analysis
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machine hall, under consideration of stator
current, stator voltage and air humidity.
Air humidity influences the PD activity
immensely and is therefore a main parameter
for assessment of insulation condition.
Diagnosis limit values are to be defined after
a certain period of continuous data
acquisition. An individual “finger print” of each
unit is made. In case of failure detection
the system generates diagnosis messages.
DIA TECH CAA-O3 – COOLING
AIR ANALYSIS – OZONE DIAGNOSIS
VATECH HYDRO GmbH& Co
Penzinger Strasse 76,
P.O. Box 5
A-1141 Wien
Phone (+43/1) 89 100-0
Fax (+43/1) 89 46 046
E-mail [email protected]
VA TECH HYDRO GmbH&Co
Service Centre Weiz
Monitoring & Diagnosis
Elingasse 3, A-8061 Weiz
Phone (+43/3172) 606 2296
Fax (+43/3172) 606 496
E-mail [email protected]
ispartof , the integratedcommon solution for secondary technology.
left: ozone analyzer, middle: example of DIATECH Trend display, right: pneumatic MUX
Acquisition of measured values:
Required
hardware:
● Ozone analyzer● Elin MUX (pneumatic multiplexer)● Elin Datalogger (control
equipment with control program)● Humidity sensor
Auxiliary parameters
for diagnosis
● Stator current + Stator voltage● Air humidity
Main specs:
Measuring technology of ozone analyzer:Ultraviolet absorption
● The system is limited to 8 measuring points:6 units and 2 references
● Measuring cycle: (dependent on hose length):10 to 15 minutes
● Hose dimension: outer/inner Ø: 6/4 mm
● Hose material: Teflon®
The analyzer collects samples from points up to200 meter away.
Requirements:
DIA TECH CAA-O3 requires the data managementsoftware package DIA TECH CORE System.
All DIA TECH Modules are running on standardpersonal computers with Windows XP.
Processing of measured values
The maximum of measuring points is eight –
six for the units and two references. A
pneumatic multiplexer – the Elin MUX –,
which is controlled by the Elin Datalogger,
manages sequence of measuring cycles and
assignment of measured concentration
values. The Elin Datalogger transmits the
pre-processed data to the computer, wherethe diagnosis software analyses the con-
centration results considering load and
ambient conditions. The load condition is
represented by stator current respectively
stator voltage, which is obtained from the
existing instrumentation and control system.
Ozone concentrations, which are collected
from the individual generators, are compared
with the reference concentration of the
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