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Transformer Diagnostics
( 1 items )
Power transformers are subject to many kinds of physical damage
that can be nearly impossible to detect – until the transformer fails!
System faults, short circuits, aging or even handling during
transportation may compromise the mechanical structure of a
transformer. Because these problems are difficult to detect, they
usually go unnoticed and worsen over time, leading to loss of
performance and possibly failure.
Until recently, your options for dealing with these critical
problems were limited. You could ignore them and hope for the best. Or,
if you suspected damage, you could detank the transformer to make a
costly and time consuming visual inspection. And even that might not
reveal the damage.
At Doble Engineering, we have built on our experience with transformers to create the M4000 Series and M5000 Series.
The M4000 Series uses patented state-of-the-art technology to
accurately evaluate the condition of substation high voltage power
apparatus, even under conditions of high electrostatic and
electromagnetic interference. For more information, go to:
Doble’s M5000 Series uses Sweep Frequency Response Analysis (SFRA)
for detecting mechanical failure or movement of windings due to short
circuits, mechanical stresses or transportation. Use it to ensure
transformer performance, reduce maintenance cost, and increase the
service life of transformers.
For more information on Doble's SFRA Diagnostic instruments, go to one of the following pages:
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Sweep Frequency Response Analysis
( 2 items )
Sweep Frequency Response Analysis (SFRA) Overview
Sweep Frequency Response: A major advance in transformer condition analysis.
The standard definition of frequency response analysis (FRA) is the
ratio of a steady sinusoidal output from a test object subject to a
steady sinusoidal input. Sweeping through the frequency range of
interest gives rise to the S in SFRA to distinguish it from impulse
methods where the response is estimated rather than measured. Sweep
Frequency Response Analysis is a proven technique for making accurate
and repeatable measurements. As compared to the “Impulse” technique,
the SFRA technique is the preferred method for making frequency domain
measurements.
How SFRA works in Doble's M-Series Test Equipment:
Doble's M-Series equipment sends an excitation signal into the
transformer and measures the returning signals. By comparing this
response to baseline and other results (such as from similar units),
you can identify deviations and confirm internal mechanical problems.
The SFRA Technique
Covers the full dynamic range and maintains the same energy level
for each frequency, providing results that are consistent and accurate.
High signal-to-noise ratio across the entire 20 Hz to 2 MHz frequency
range ensures valid measurements.
SFRA Resource Center
The Doble SFRA Resource Center is a collection of documents which
cover many aspects of Transformer Frequency Response Analysis (FRA)
using Doble's M5100 Sweep FRA (SFRA) test set.
To learn more about the basics of SFRA, click here to read an article on the topic
Doble's M5000 Series
Doble’s M5000 Series uses Sweep Frequency Response Analysis (SFRA)
for detecting mechanical failure or movement of windings due to short
circuits, mechanical stresses or transportation. Use it to ensure
transformer performance, reduce maintenance cost, and increase the
service life of transformers.
For more information on Doble's SFRA Diagnostic instruments, go to one of the following pages:
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Surge Arrester Monitoring
( 1 items )
Surge Arresters Monitoring
Doble's TransiNor office created the LCM II System for managing your
surge arrester monitoring needs. This portable, cost-effective system
uses Windows© LCM II Software and created a unique identification of
each surge arrester for easy data management. LCM II can be used for
continuous monitoring of one or more arresters to investigate details
in leakage current changes versus the length of time in which they
occur.
LCM II
LCM II is the complete system for condition monitoring of your Metal Oxide Surge Arresters.
«No interruption of service operation»
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Partial Discharge Detection
( 1 items )
Doble's TransiNor office created APDA for Condition Monitoring of Medium Voltage Cable Terminations and Cable Joints. APDA gives you the ability to check cable accessories without disturbing normal service operation, and detect defects preventing possible breakdown. With the APDA you'll have an optimum economic condition based maintenance and renewal program.
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Oil/Materials Analysis
( 2 items )
Doble has created the DOMINO Moisture-in-Oil sensor to manage the
state of your bushings/CTs, transformers and circuit breakers. The DOMINO Moisture-in-Oil
sensor is an accurate, simple, robust and versatile instrument,
measuring just that: moisture in oil in terms of ppm and relative
saturation plus the added benefit of temperature. It is a sensor that
provides for the continuous reliable measurement of the water content
of electrical insulating liquids and other types of oils.
The Doble Laboratory can provide answers and solutions to your
problems based upon quality data from a wide scope of testing
capabilities and a rich experience in apparatus diagnostics. We can
help you develop the most cost-effective testing program for condition
assessment or help identify and solve apparatus problems. All test
reports include an analysis of the data and recommendations for
remedial action if warranted.
DOMINO
Doble Engineering developed one of the first analytical techniques
for the measurement of dissolved water in oil and also developed
probably the first on-line moisture monitors, the DOMINO.
DOBLE LABORATORY
The Doble Laboratory is fully equipped to perform a wide variety of
tests on insulating materials, with more than fifty tests offered on a
routine basis.
CONTINOUS ONLINE DIAGNOSTICS
Doble has created a variety of online devices to manage the state of your bushings/CTs, transformers, circuit breakers, and other apparatus.
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Continuous On-line Diagnostics
( 2 items )
Doble has created a variety of online devices to manage the state of your bushings/CTs, transformers, circuit breakers, and other apparatus.
DOMINO
Obtaining accurate moisture and temperature data is necessary to
determine the condition of electrical apparatus or its insulating
liquid. However, the data by itself may not always be sufficient to
identify potential problems, especially in transformer systems. Doble
Engineering developed one of the first analytical techniques for
measuring dissolved water in oil and the first online moisture monitor:
DOMINO.
Insulator Pollution Monitor (IPM)
The IPM is designed to perform continuous online monitoring of
external pollution effects on high-voltage insulators and other
insulator housings, such as surge arresters and bushings.
Intelligent Diagnostic Devices
Doble created Intelligent Diagnostic Devices (IDDs), a family of
continuous online diagnostic devices for power system apparatus
intended to detect incipient problems with bushings/CTs, transformers,
and circuit breakers. Now you can safely manage progressive problems
and efficiently schedule corrective action. There are three types of
IDD instruments: Moisture, Bushings, and Dissolved Gas Analysis.
LCM II
TransiNor created the LCM II to monitor the condition of
high-voltage Metal Oxide Surge Arresters (MOSAs) in service. This
complete system for condition monitoring measures the resistive
component of the MOSA leakage current. Increased resistive leakage
current indicates a higher risk of MOSA breakdown.
1_Domino_Brochure_9-2007.pdf (260.92 kB)
DominoUSS_Brochure_4-3-07.pdf (369.71 kB)
IPMBrochure.pdf (1.15 MB)
IDD_Bushing_9-2007.pdf (221.84 kB)
IDD_Dissolved_Gas_10_04.pdf (220.01 kB)
IDD_Moisture_10_04.pdf (130.11 kB)
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Protection Diagnostics
( 10 items )
Doble Protection Diagnostic Instruments are compact, rugged and field portable instruments used worldwide by test engineers to diagnose and calibrate electromechanical and numerical schemes. The instruments are designed to provide fully automated steady-state, dynamic and transient testing capability, in the field as well as in a laboratory environment
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Circuit Breaker Diagnostics
( 5 items )
Circuit Breaker Diagnostics
Doble's circuit breaker diagnostic products provide you a method for
testing everything from simple circuit breakers to complex ones, using
a single, field-portable, rugged instrument and Windows-based software.
The modular design allows you to acquire a circuit-breaker test system
matched to today's specific testing applications and to upgrade in the
field to test different or more complex apparatus.
Doble offers the following circuit breaker diagnostic instruments and software:
