Products (Please click on specific product for
details)
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Boroscopes from Zibra Corp.
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ELCID (Electromagnetic Core Imperfection Detection) Evolution
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Electromagnetic Core Imperfection Detection (EL CID) testing is accepted world-wide
for reliable and safe detection of stator core inter-laminar faults (CIGRE, 2004)."
Originally developed by the CEGB in England, the EL CID Evolution is a third generation
instrument that is proven, reliable and easy to use. The EL CID Evolution tests
the condition of a stator core in less time and with fewer resources than the earlier
EL CID models.
The ELCID instrument can be used to test turbo-generators, hydro-generators, and
large motors.
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• Faster test scanning (up to 120mm/sec @60Hz)
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• Easier excitation calculations
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• Simpler testing with dual Chattocks
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• User-friendly LCD display to guide user operation
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• Ability to combine step-iron data with main core traces
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• "Hot spots" color map display
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• Fully compatible with existing data
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• Tests are repeatable
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• Immediate test results are available for local analysis
and emails
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• Determines if defects are on the surface, under conductors,
or sub-surface
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• Tests with or without windings in place
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• Allows partial retests of a core. Results can be merged
to obtain a complete picture of the core condition
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• Trending of previous results
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• Excellent quality assurance test
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EL CID operates at only 4% of normal operating flux. This low flux is generated
by a portable, quickly installed excitation kit. Any imperfection in the core inter-laminar
insulation produces fault currents, which are detected by a Chattock coil and analyzed
by the EL CID signal-processing unit. Measurement results are digitally stored in
a laptop for analysis and report generation to precisely locate the faults in the
stator core. Future results can be compared to past results for trend analysis.
The Robotic Inspection Vehicle (RIV) compliments the EL CID Evolution, and is ideally
suited to test large stator cores. Having the capability to follow automatically
the edge of stator teeth, the RIV carries the Chattok, thereby significantly reducing
operator fatigue. This also increases the speed of testing.
Powertest Asia offers EL CID generator testing services, as well as a complete training
course on the use and operation of the EL CID Evolution instrument.
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Robotic Inspection Vehicle
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The Robotic Inspection Vehicle is a low profile (30 mm/11⁄4") magnetically
supported robotic vehicle that can carry the Chattock of the EL CID stator core
fault test equipment along the stator core of an electric generator or a large electric
motor. The automated scanning at a fixed speed provides easier testing and more
consistent results than an EL CID core fault test performed manually. Leading OEM's
and power utilities have successfully used the RIV on large generators for EL CID
testing and to carry other transducers such as mini-cameras and Wedge Tightness
Detector probes.
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• Width adjustment via two lockable sliding bars
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• Magnetically self supporting on steel surface
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• Guidance system detects the edges of the stator teeth
to follow a straight line
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• Side plates give additional guidance when wedges are
recessed or when wedges and coils are removed
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• Curvature adjustment accommodates the tractor in stator
cores of various sizes
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• Distance measurement via encoder wheel
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• Chattock sense coil is clamped into spring loaded shoes
so that the ends of the coil press lightly against
the core
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• AUTO mode allows the RIV to stop at a pre-set distance
and then move only in the opposite direction
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Wedge Tightness Detector
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The WTD-501 instrument is an improved version of the original WTD-123. Generator
testing with the WTD-501 instrument quickly and objectively measures the relative
tightness of all stator wedges in a machine. The redesigned probe is small, light
and adjustable to fit most rotating machines, regardless of slot size or depth.
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• Accurate, reliable and consistent results assist in maintenance
decisions to be reached
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• Objective electronic analysis removes subjectivity of
hand tapping
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• Quick, easy collection and interpretation of data
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• Easy to operate, experienced personnel not required
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Stator wedges were traditionally tested for tightness by tapping them with a hammer
and listening to the sound produced. Electronic stator wedge tightness detection
is faster, more accurate, provides more consistent results than hand tapping methods,
and the test procedure is repeatable. The WTD Model 501 can be used to test all
types of generators and motor stator wedges, including those with ripple springs.
Loose stator wedges may lead to vibration and erosion of stator insulation in electric
generators. These serious problems can cause generator failure. The WTD acts as
a sophisticated electronic ear that quickly and reliably provides an electronic
map of wedge tightness.
The tightness of each wedge is compared to all other wedges in the winding, the
wedges of another winding or an absolute external reference. A colored map showing
the relative tightness of every wedge in the stator is produced and the data can
be stored for trend analysis to determine when maintenance will be required.
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DC Ramp Test Set
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The DCR-50 instrument provides a safer off-line test of stator winding insulation
compared to a DC or AC hipot test. It can identify problems in the stator winding
insulation before an unexpected in-service failure, unlike the pass/fail of a dc
or ac hipot test.
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• Ground Presence Detection and Protection
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• Automatic Ramp or Manual Mode
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• Ramp Rate Control (0-2.5 kV/min)
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• Manual Voltage Control (0-50 kV)
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• Automatic Trip Protection (high/low tracking, output
limit, fault detection)
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• Built-in Winding Discharge Circuit
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• Voltage Metering (0-50 kV)
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• Current Metering (0-250 µA, range switchable, charge
and discharge)
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• Analog and Digital Outputs for Voltage and Current
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• Connection to a PC
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An automatically ramped or manually stepped direct voltage (up to 50 kV) is applied
to the stator winding and the resulting current is measured and plotted against
voltage. Examination of the current versus voltage curve allows assessment of stator
insulation condition, as well as diagnosis of damage, defects, and deterioration
mechanisms. The DCR-50 allows tests to be performed in accordance with IEEE Std
95-2002.
The test results are repeatable and accurate. This test can frequently identify
stator insulation windings that are approaching failure, without accelerating the
deterioration process. It can take less than an hour to perform. The DC Ramp Test
method has been proven for motor and generator insulation testing for many years
by the US Bureau of Reclamation and others. It is applicable to asphalt, polyester
and epoxy-mica insulation systems.
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Partial Discharge Monitoring Systems
PDA Couplers specifically designed to detect partial discharge activity from hydro
generator stator windings.
Whether it’s the epoxy-mica or cable type, these couplers are permanently installed
at specific locations on the stator winding to optimize electrical noise / partial
discharge pulse separation.
PDA couplers detect stator winding PD activity. In the last two decades Epoxy Mica
Capacitors (EMCs) have become the industry’s choice due to reliability and the relative
ease of installation. EMCs installation usually requires about 3 to 4 days of effort
per machine. Typically, on machines rated less than 100 MW, only 6 couplers are
installed. On large machines, sometimes more than 6 PDA couplers are installed.
The standard package includes a set of 6 couplers, a termination box and installation
hardware.
• Stator
• Bus Coupler
• Stator
Slot Couplers
Acquiring Partial Discharges
• TGA-B
The TGA-B is a portable instrument specifically designed to monitor PD in motors
and turbine generators equipped with Bus couplers. The TGA-B instrument determines
the magnitudes, rates and polarities of voltage pulses created by partial discharges.
Additional parameters such as NQNs and peak pulse magnitudes are also calculated.
The instrument comes equipped with user selectable RS232, USB, or Ethernet (TCP/IP)
communication modes. An external computer is used to acquire, display, and store
PD test results quickly and conveniently.
• TGA-S
The TGA-S is a portable instrument specifically designed to monitor PD in turbo
generators equipped with Stator Slot Couplers (SSCs). The SSC approach to PD monitoring
is a patented technology, exclusive to Iris. The TGA-S instrument determines the
magnitudes, rates and polarities of voltage pulses created by partial discharges.
Additional parameters such as NQNs and peak pulse magnitudes are also calculated.
The instrument comes equipped with user selectable RS232, USB or LAN communication
ports. An external computer is used to acquire, display, and store PD test results
quickly and conveniently.
• PDA-IV
The PDA-IV is a portable instrument specifically designed to monitor PD in hydro-generators
equipped with PDA Couplers. The PDA-IV instrument determines the magnitudes, rates
and polarities of voltage pulses created by partial discharges. Additional parameters
such as NQNs and peak pulse magnitudes are also calculated. The instrument comes
equipped with user selectable RS232, USB, or Ethernet (TCP/IP) communication ports.
An external computer is used to control data acquisition, display, and store PD
test results quickly and conveniently.
• Corona Probe
The Corona Probe is an off-line instrument to accurately pinpoint the source of
partial discharge (PD) in a particular slot in generators and motors. Complete kit
comes with PPM-97 peak pulse meter, ferrite probe, ground strap and handy carrying/storage
case.
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• Continuous wave sensitivity: 0.9 V RMS
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• Batteries: 9 V
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The Corona Probe (originally known as the TVA probe) is used to locate partial discharge
in each slot with the winding energized phase by phase. It supplements on-line partial
discharge monitoring. The PPM-97 probe is generally used on motors and generators
with rated voltage greater than 6 KV
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Rotor
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• Flux Monitor
The Flux probe instrument is a sophisticated on-line monitor to remotely acquire
magnetic flux data from air gap mounted flux probes in synchronous motor and generator
rotors. Air gap flux monitoring is a proven tool used to provide information on
the integrity of the rotor winding inter-turn insulation. This information is critical
in planning maintenance, explaining abnormal vibrations and verifying new and rewound
rotor integrity.
Traditionally, portable instrumentation has been used to acquire magnetic flux signals
from probes permanently mounted on the machine stator. The Flux probe system consists
of a permanently connected Flux probe acquisition device which is mounted in the
plant and can be connected to probes from up to four generators.
This instrument includes user-friendly Windows™ acquisition software, which is used
to store data from any of the four inputs on demand. Using generator load information,
the Flux probe instrument can automate your magnetic flux measurements, freeing
you from traveling to the plant, or having to be available during hard-to-schedule
generator run-ups.
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