Diagnostic equipment
Measurments at energized equipment
| Type of diagnostics | Purpose | Measuring equipment | |
|---|---|---|---|
|
Measurement of AC dielectric characteristics |
Assessment of insulation state; timely detection of local defects in insulation; forecasting of operaton life and load capacity of transformers |
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| Estimation of radiated thermal energy, defect revealing according to variation of temperature field and disturbances of thermal balance. |
Identification of a number of defects: local heating of structural elements, presence of oil stagnation zones, inefficient operatipon of cooling system, deterioration of contact joints condition, occurence of shorted circuits, deterioration of HV bushing insulation and current transformers, etc. |
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Thermovision camera ТН9100WV, «NEC Sanei», Japan |
| Vibration measurment |
Check of correspondence of equipment vibration parameters to the requirments of Standards; estimation of the mechanical stresses on insulation, metal structures and fasteners occured in conditions of equipment vibration; development and reasoning of constructional measures to reduce vibration and noise of equipment. |
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Data collector 2526 Series, «Bruel & Kjear Vibro», Denmark; SVAN-956, «SVANTEK», Poland |
| Inspection of acoustic characteristics |
Workplace noise level estimation; chousing of hearing organs protective means; products' quality control, octave and one-third octave sound analysis in the real time mode |
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Portable analizer, Type 2250, «Bruel & Kjear», Denmark |
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Express dissolved gases analisys (DGA) of transformer oil |
Check for abnormal thermal and discharge processes in the equipment |
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Gas analiser TransportX, «Kelman», Nothern Ireland |
Measurements and testing at de-energized equipment
| Type of diagnostics | Purpose | Measuring equipment | |
|---|---|---|---|
| AC measurement of dielectric characteristics | Estimation of insulation condition according to measured parameters: dielectric loss tangent and capacitance of insulation |
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Insulation analyzer M4000, «Doble», USA |
| Measurement of insulation resistance | Estimation of insulation condition related in particular to absorption. Determination of insulation condition in electric plants with grounds for further preventive actions |
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Megohmmeter CA 6547, «CHAUVIN ARNOUX», France;
MIC-5000, «SONEL», Poland |
| Adjustment of OLTC diverter switches, accumulation and storage of switching oscillograms | It is purposed for measurement of time parameters and adjustment of tap changers at site and stationary conditions (OLTC diverter switches) |
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Current recorder «Parma RT 1.16», «Parma», Russia |
| Inspection of hard-to-reach transformers areas | Measurement and revealing of defects |
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Video system IPLEX, «Olympus», Japan |
|
Amplitude-frequency analysis (FRA) of transformer |
Determination of mechanical state of windings and magnetic core, detection of defects in earthing circuit and lead fastening |
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Diagnostics complex: FRAnalyzer «Omicron», Austria |
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Other typical measurements of transformers parameters |
Assessment of condition of transformer and its components according to no-load characteristics at reduced voltage, windings DC resistance, short circuit impedance |
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Multimiters: UNIGOR 380, UNIGOR 390, «LEM», Germany |
