A Transformer Winding Deformation Tester is a precision diagnostic instrument used to detect mechanical deformation or displacement in the windings of power transformers, including high-voltage (HV), medium-voltage (MV), low-voltage (LV), and tap-changer windings. It is used to assess the mechanical integrity of transformer windings, identify potential fault risks at an early stage, prevent catastrophic failures such as short circuits or explosions caused by winding deformation, and ensure the safe and stable operation of the power grid.
As a professional transformer testing equipment manufacturer and supplier in China, UHV focuses on providing high-precision diagnostic solutions for winding deformation detection, supporting utilities, transformer manufacturers, and maintenance service providers with reliable condition assessment tools for power system safety.
Technical parameter
| Linear sweep frequency measurement range | (1kHz)～(1MHz) |
| Segment sweep frequency measurement range | (0.5kHz)～(1kHz) |
| (0.5kHz)～(10kHz) | |
| (10kHz)～(100kHz) | |
| (100kHz)～(500kHz) | |
| (500kHz)～(1000kHz) | |
| Range of amplitude | (-100dB)～(+20dB) |
| Accuracy of amplitude measurement | +20dB～-60dB;±1dB |
| -60dB～-100dB;±2dB | |
| Sweep accuray | 0.01% |
| signal input impedance | 1MΩ |
| signal output impedance | 50Ω |
| In phase test repetition rate | 99.5% |
| Measuring instrument size (L × W × H) | 300×340×120mm3 |
| Instrument aluminum alloy packing box size (L × W × H) | 310×400×330mm3 |
| Weight | 10kg |
Reasons for detecting winding deformation
Transformers may experience various mechanical stresses or electromagnetic force impacts during operation or transportation, such as:
Short-circuit fault current surges: The most common cause. High short-circuit electromagnetic forces subject windings to extreme mechanical stress, potentially causing displacement, twisting, bulging, or inter-turn short circuits.
Collisions or shocks during transportation or installation.
Incorrect operations (e.g., improper on-load tap changer operation).
Accumulated vibration during long-term operation.
Manufacturing defects.
Winding deformation changes the distributed capacitance and inductance between windings, thereby altering their frequency response characteristics. Minor deformation may not immediately affect operation; however, it significantly reduces the transformer's insulation strength and short-circuit withstand capability, greatly increasing the risk of future failures.
Primary Application Scenarios:
Preventive maintenance testing: Regular testing to establish baseline data and monitor changes in winding condition.
Post-fault diagnosis: Assessing winding damage and its extent after a transformer experiences external short circuits or overcurrent surges.
Factory acceptance testing (FAT): Verifying the structural integrity of new transformer windings.
Post-installation/transportation acceptance: Confirming whether windings have been damaged during transportation or installation.
Pre-/post-repair assessment: Comparing results before and after maintenance (especially tank or core lifting operations) to confirm repair effectiveness or identify new issues.
Condition assessment: Serving as a key indicator in comprehensive transformer condition evaluation.
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