DiagnóstiQA performs electrical predictive maintenance tests on power transformers, measuring transformers, rotative machines and circuit breakers in order to assess their condition.
SCOPE
• Power transformers:
- Dissipation factor/ Power Factor/ Tan Delta and Capacitance of windings and bushings with frequency sweep and voltage sweep “tip-up”.
- Winding Resistance
- Turn Ratio
- Exciting current.
- Short circuit impedance
- Demagnetization
- Dielectric frequency response analysis / DFRA /frequency dielectric spectroscopy / FDS
- Frequency Response Analysis/ SFRA
- Current transformers analysis.
- Insulation Resistance / Polarized Index.
- Partial discharge analysis on-line and off-line.
• Instrument transformers
- Current transformers:
- Dissipation factor/ Power Factor/ Tan Delta and Capacitance of windings with frequency sweep and voltage sweep “tip-up”.
- Dielectric frequency response analysis / DFRA /frequency dielectric spectroscopy / FDS
- Partial discharge analysis.
- Polarity check.
- Ratio and phase accuracy.
- Winding resistance.
- Excitation characteristics (knee points).
- Composite error (ALF, ALFi, FS, FSi, Vb).
- Burden impedance.
- Transient CT classes and parameters (TPS, TPX, TPY and TPZ type CTs).
- Transient dimensioning factor (Ktd).
- Burden.
- Remanence and residual magnetism
- Voltage transformers:
- Dissipation factor/ Power Factor/ Tan Delta and Capacitance of windings with frequency sweep and voltage sweep “tip-up”.
- Dielectric frequency response analysis / DFRA /frequency dielectric spectroscopy / FDS
- Partial discharge analysis.
- Ratio and phase accuracy.
- Polarity check.
- Winding resistance.
- Burden.
•Surge arrester:
- Watt losses and total current.
•Rotative machinery::
- Dissipation factor/ Power Factor/ Tan Delta and Capacitance of windings with voltage sweep “tip-up”.
- Insulation Resistance / Polarized Index / Polarization Depolarization Current Analysis / EDA.
- Dielectric frequency response analysis / DFRA /frequency dielectric spectroscopy / FDS
- Partial discharge analysis on-line and off-line.
- Detection, pinpoint, and document of flash-arc corona and arcing partial discharge with camera UV.
- Dielectric withstand test / Hi-pot.
- Winding Resistance
- Impulse winding test.
- Frequency Response Analysis/ SFRA
- Electromagnetic imperfection testing / CID.
- Pole drop testing.
- Insulation Resistance / Polarized Index.
•Circuit Braker
- Operation timing and contacts synchronism.
- Motion / Contact travel: over-travel, total travel, rebound, damping time, contact wipe, …
- Coil current.
- Static contact resistance.
- Insulation resistance
- The SF6 gas quality: volume percentage, moisture concentration, SO2 concentration, HF concentration, H2S concentration and CO concentration.
SECTORES
• Electrical generation
• Transport ans distribution
• Chemical and petrochemical
• Automotive
