After a transformer is designed and manufactured, its coils and
internal structure are fixed. For multi-winding transformer coils,
identical voltage ratings and winding methods translate to fixed
parameters (Ci, Li), which lock in each coil’s frequency-domain
characteristic response. As a result, the frequency spectra of the
three-phase coils can be compared effectively.
Transformer winding distributed parameters change when
interturn/phase-to-phase short circuits happen during testing,
coils shift due to transportation impacts, or electromagnetic
forces deform coils during short-circuit/fault operation. These
changes disrupt the transformer’s original frequency-domain traits,
including frequency response amplitude fluctuations and resonance
frequency offsets. Our Transformer Winding Tester—engineered using
response analysis—is a state-of-the-art non-destructive tool for
detecting internal transformer faults, applicable to 63kV–500kV
power transformers.
This tester quantifies how transformer winding parameters respond
across different frequency ranges. It assesses the extent of
internal winding deformation by evaluating parameter change
magnitudes, frequency response variation amplitude/regions, and
trend patterns. Using these insights, users can quickly determine
if a transformer is severely damaged and needs overhaul.
Frequency Response Method Features:
1. The transformer winding deformation tester consists of a
measurement unit and analysis software. The measurement unit is
controlled by a high-speed single-chip microcomputer and comprises
signal generation and signal measurement. The measurement unit
connects to a tablet or laptop via a USB interface.
2. During testing, only the transformer's connecting busbars need
to be removed; all tests can be completed without lifting the
transformer's cover or disassembling it.
3. The instrument features multiple linear frequency sweep
measurement systems, with a frequency sweep range up to 10MHz. The
frequency sweep interval can be set to 0.25kHz, 0.5kHz, and 1kHz,
providing more detailed analysis of transformer deformation.
4. The instrument is highly intelligent and easy to use, with
features such as automatic range adjustment and automatic sampling
frequency adjustment.
5. The software uses the Windows platform and is compatible. It
provides users with a more convenient and user-friendly display
interface.
6. It provides historical curve comparison analysis, allowing
multiple historical curves to be loaded simultaneously for
observation. Any curve can be selected for horizontal and vertical
analysis. It is equipped with an expert intelligent analysis and
diagnosis system that can automatically diagnose the state of the
transformer windings. It can load six curves simultaneously,
automatically calculate relevant parameters for each curve,
automatically diagnose winding deformation, and provide diagnostic
reference conclusions.
7. The software has powerful management functions, fully
considering the needs of on-site use. It automatically saves
environmental condition parameters to provide a basis for
transformer winding deformation diagnosis. Measurement data is
automatically saved, and it has a color printing function, making
it convenient for users to generate test reports.
8. The software is highly user-friendly. Most measurement
conditions are selectable options. Detailed transformer parameters
can be saved for diagnostic reference and do not need to be entered
on-site; information can be added or modified later, making it more
convenient to use.
9. The software is highly intelligent. After connecting the input
and output signals and setting the condition parameters, all
measurement work can be completed. Historical waveform curves can
be opened at any time during measurement for comparison and
observation, and measurement can be stopped at any time.
10. The time required for each phase measurement is less than 60
seconds. The total time required for winding deformation
measurement of a power transformer with high, medium, and low
windings (regardless of capacity and voltage level) is no more than
10 minutes. 11. When measuring transformers, wiring personnel can
freely arrange the signal input and output leads without affecting
the measurement results. Wiring personnel can remain on top of the
transformer oil tank, eliminating the need to climb down, thus
reducing labor intensity.
Trace Moisture Meter Karl Fischer Microcoulometric White Customized
