portable partial discharge monitoring system
TRANSCRIPT
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PORTABLE PARTIAL DISCHARGE MONITORING SYSTEM
Predictive maintenance method
Nowadays, the partial discharges (PD) measurement is one of the most reliable methods to
evaluate the insulation condition of high voltage electrical installations.
The defects in the insulation due to manufacture, assembly or aging are evidenced generating
PD that accelerate the degradation process causing the premature dielectric failure.
The PD measurement with BlueBOX Technology is a non-invasive technique that allows to
locate and to evaluate the severity of all the insulation defects in order to avoid the
breakdown.
BlueBOX Technology
The portable system MS Pico is the adaptation of the continuous monitoring technology used
by Diael to solve efficiently spot measures.
BlueBOX technology not only allows the offline PD measurement as the traditional systems,
but also thanks to its automatic noise suppression system and automatic localization tools, it
enables the online PD measurement. The online PD measurements diagnostic avoids the costly
discharging of the installation as well as the use of complex mobile generators.
MS Pico
The MS Pico is a portable partial discharges measurement and analysis system for medium,
high and ultra high voltage installations. It has been designed for online and offline
commissioning and periodic verifications of:
- Terminations - Substations - Underground cables - Power Transformers - Motors and Generators
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INCLUDED COMPONENTS
MEASURING INSTRUMENT
1 x MS Pico (suitcase included) 3 x Open core current transformer sensors (HFCT) 1 x Pulse Calibrator
ACCESORIES
1 x USB Cable communication - power supply (20cm) 4 x PD measurement coaxial cable with BNC connector (5m) 1 x Voltage Reference measurement coaxial cable with BNC connector (5m)
SOFTWARE
1 x PD-Pico Software License
TECHNICAL SUPPORT
1 x Training session
ADDITIONAL ACCESORIES
SENSORS
Short range PD Sensor ultra high frequency (UHF)
UHF-HF Converter signal adapter for MS Pico
Current Sensor for sinusoid reference
CONTROL LAPTOP
Laptop for measuring and diagnosis BlueBOX technology software
TECHNICAL SUPPORT
Pack of 10/20/30 partial discharge diagnostic reports
Advanced diagnostic training (20h)
TECHNICAL SPECIFICATIONS
Partial discharges measuring channels Input connector BNC female
Input impedance 50Ω
Coupling AC
Configurable voltage range
From ±10mV to ±20V
Vertical resolution 14 bits
Bandwidth 0 - 60 MHz
Sampling rate 125 MS/s
Memory depth 32 MS per channel
Overvoltage protect and analog filter
Passive protection and high pass filter of 16kHz
Enclosure
Dimensions 190 x 170 x 40 mm
Weight < 0,5 kg
Temperature ranges
Storage temperature
From -20ºCtoa 60º C
Operation temperature
From 0ºCtoa 40ºC
Channel for voltage reference measurement Input connector BNC
Input impedance 1MΩ
Coupling AC
Configurable voltage range
From ±10mV to ±20V
Vertical resolution 14 bits
Bandwidth 0 – 60MHz
Sampling rate 100 MS/s
Memory depth 32 MS
Overvoltage protect and analog filter
Passive protection and low pas filter of 1MHz
Control functions Connection type USB 3.0 Super Speed (USB 2.0
compatible)
Power supply requirements
AC source or power supply by USB 3.0 of 1.2 A.
Consumption 6 W
Trigger function Trigger condition Manual triggering or reception of
synchronization electrical signal
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EEFECTIVE SOLUTION FOR MEDIUM AND HIGH VOLTAGE
The MS Pico measuring device is the ideal solution for punctual measurement of partial
discharges. It consists of a small register with 4 measuring channels that can be powered form
a laptop. Inside the suitcase it also has space to transport all the necessary accessories to
realize the PD acquisition and accomplish a complete diagnosis. It allows complete a partial
discharges measurement in minutes and to conduct a diagnosis at real time.
The MS Pico has been conceived and designed so that operators with basic knowledge are able
to diagnose the condition of the installation. This equipment shines fundamentally in 4
aspects.
1) Simple installation
The MS Plus Portable can be located near the measuring point, allowing an easy connection
with the sensors. The connection with the control computer is made by USB 3.0.
2) Easy and automatic measurement
The 4 measurement channels of the MS Plus Portable
allows the user to obtain a voltage reference and
simultaneously capture the DP signals from the three
phases. The MS Plus Portable incorporates an automatic
data acquisition process with no need of additional
adjustments, allowing always an operator with basic
knowledge to perform the measurement in less than 5
minutes.
3) Automatic PD Pulses recognition
The MS Pico highlight over other technologies thanks to its automatic noise suppression tool
which enables the automatic PD pulses detection even under the electric noise level of the
installation. The patented BlueBOX Technology permits an automatic measurement in the
whole sensor bandwidth, compared to traditional methods based on manual filtering in certain
frequency bands. This powerful filtering technology allows to use the maximum resolution of
the equipment, detecting the most incipient defects.
Measurement bandwidth
High signal/noise ratio
Frequency spectrum of real installation noise
Automatic PD pulse recognition under
background noise level
PD Pulse Raw signal captured by sensor
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4) Powerful analysis software
The software of the MS Pico is conceived to be able to diagnose efficiently and precisely the
defects found in electrical installations thanks to its available tools.
a) Phase resolved PD pattern
The software of the MS Pico is designed to perform a real-time diagnosis, representing the
phase resolved PD pattern of the pulses registered by the equipment.
b) PD Cluster
To achieve the separation of more than one PD source located in a single position, BlueBOX
Technology characterized the shape of each partial discharge source with three parameters:
two parameters α and β correlated with the asymmetry of the pulse envelope and other
parameter ω correlated with the frequency of the PD pulse. These three parameters allow a
3D representation, allowing to select the partial discharge cloud associated to each generated
PD source whose phase resolved pattern corresponds to characteristic PD defect pattern
(internal defect, corona, external superficial DP, etc. )
c) Defects localization
PD pulses can be automatically located either through automatic reflectometry, short-range
UHF sensors or by placing synchronized sensors at both cable ends. The difference of arrival
times of the same PD signal to the two sensors located at the cable ends, allows to identify the
position of the PD source. The polarity of the pulse permits to
identify the affected insulation in border elements
(transformer or cable). BlueBOX technology
Online or offline measurements
in all electrical installations.
Possible diagnosis with basic
knowledge
Automatic noise suppression
Automatic defects localization
CORONA EXTERNAL SURFACE CAVITY
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GENERIC SOLUTION
Solution PD Pico
A unique and optimized solution consisting of an MS Plus Portable and 3 high frequency
current transformers (HFCT) sensors. This solution allows a single operator to diagnose the
insulation condition of cables, substations, power transformers and generators.
Application in medium voltage grids
In MV grids by connecting the open core sensors around the cable screens, the MS Pico allows
to diagnose the cable system as well as the cabinet, the measuring switchgear and the
transformer. As the measurement is performed using high frequency current sensors (HFCT),
this permits to register signals from a range of several kilometers, thus optimizing the
measured positions in MV grids for an effective diagnosis. These tests can be performed
optimally with pre-installed sensors being necessary only 5 minutes to accomplish the
measurement.
PD Pico Solution
Multipurpose solution
Optimized in resources
Non-invasive
Effective capture
Components
1 x MS Plus Portable 3 x HFCT Sensor 1 x Pulse Calibrator 1 x Control Unit (Laptop) 1 x Software License
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Application in high voltage grids
In HV grids the MS Pico allows the measurement of partial discharges in different electrical
assets. The equipment permits to detect defects coming from the high voltage cables by
measuring from one of its terminations in the case of cables length up to 2km.
In HV substations the measurement of the cable connecting the transformer to the substation
allows to identify defects coming from the cable, the transformer as well as the GIS. In the case
of transformers without insulated cable connection, the measurement can be made by
connecting the equipment to the transformer capacitive tap adapter.
For deeper analysis of defects
located in the GIS, the MS Pico can
be used with short-range UHF
sensors, allowing to identify sources
of PD at short distances, these UHF
sensors can be placed at the
termination of the cables or at the
separators or inspection windows of
the GIS.
Application in motors and generators
The MS Pico can also be used for the diagnosis of
motors and generators. For this purpose, if there
is no connection with an insulated cable, coupling
capacitors connected to the busbars must be
available to perform PD measurements.
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DIAEL is a Spanish technology-based company that develops and manufactures partial
discharge monitoring products. DIAEL has a large experience in monitoring services of high
voltage installations, with over 1000 measurements in more than 10 countries.
The BlueBOX technology for partial discharge measurement commercialized by DIAEL permits
the detection and localization of defects in high voltage installations through non-invasive
measurements performed online or offline. This technology, promoted by Spanish electricity
companies and developed by the Polytechnic University of Madrid, has been widely tested and
validated during recent years in Spanish and foreign electrical installations.
The measurement of partial discharges with this technology permits an automatic noise
suppression facilitating the measurement to operators with a basic knowledge. The insulation
status diagnosis is performed through efficient tools allowing to detect precisely the defects of
the installation.
DIAEL, S.L.
C/ Peñuelas, 38, Local 2
28005 Madrid (España)
Web: www.diael.com
E-mail: [email protected]
Teléfono: +34 911 392 579