Calibration Methods for Reproducible and Comparable Electromagnetic Partial Discharge Measurements in Power Transformers

af


Calibration Methods for Reproducible and Comparable Electromagnetic Partial Discharge Measurements in Power Transformers
Du sparer Spar kr. 60,00 med Saxo Premium
  • Leveringstid 5-9 hverdage
  • Forventet levering 17-12-2020
  • Kan leveres før jul
Hvis du køber til medlemspris, bliver du automatisk medlem af Saxo Premium. De første 30 dage er gratis, derefter koster det 99,-/md. Medlemskabet fornyes automatisk og kan altid opsiges. Læs mere om alle fordelene her.
Format:
Bog, paperback
Udgivelsesdato:
01-11-2020
Sprog:
Engelsk
Sidetal:
128
  • Beskrivelse
  • Yderligere info
  • Anmeldelser

The reliability of electrical energy networks depends on the quality and availability of their electrical equipment, e.g., power transformers. Local failures inside their insulation can lead to breakdowns resulting in high outage and penalty costs. To prevent these destructive events, power transformers are tested for partial discharge (PD) activity in a routine test before shipment. Furthermore, PD activity can be evaluated as a diagnostic measurement on-site (on-line or off-line) or be constantly monitored during service using the ultra-high frequency (UHF) method. In this thesis, a calibration procedure is proposed for the UHF method used in power transformers, which is lacking so far. The calibration process is required to ensure both reproducibility and comparability of UHF measurements. Only a calibrated UHF measurement procedure can be deemed reliable and eventually be introduced to supplement in (site-)acceptance tests of power transformers. The proposed calibration method considers two factors: The influence of the UHF sensors' sensitivity and that of the UHF instrument characteristics, including accessories like cables, pre-amplifier, etc. The UHF instruments' influence is corrected by using a defined and invariable test signal as a reference for all recording devices comparable to the calibration method used in IEC 60270 for electrical PD measurement. The sensitivity of the UHF sensor is addressed by a characterization of UHF sensors using the antenna factor (AF) measured in a special reproducible setup, i.e., a GTEM cell. In this thesis, a self-built GTEM cell is presented, which is oil-filled to address the environmental conditions inside a transformer where the sensor will be used. With such a cell, influences on the AF of UHF sensors are investigated, and it is shown that sensor sensitivities measured in an air-filled cell can be corrected to the oil environment. A practical evaluation of the proposed calibration procedure is performed in a laboratory

Vis mereVis mindre

Udgivelsesdato:
01-11-2020
ISBN13:
9783752628180
Vægt:
197 g
Dybde:
8 mm
Bredde:
148 mm
Højde:
210 mm
Forlag:
Books on demand
Format:
Paperback
Forfattere

Vis mereVis mindre

Vis mereVis mindre

Fandt du ikke hvad du søgte?

Hvis denne bog ikke er noget for dig, kan du benytte kategorierne nedenfor til at finde andre titler. Klik på en kategori for at se lignende bøger.

Velkommen til Saxo - din danske boghandel!

Hos os kan du handle som Gæst, Saxo-bruger eller Saxo Premium-medlem. Du bestemmer selv, og vores kundeservice sidder altid klar med hjælp.

Om medlemspriser hos Saxo

Hvis du køber til medlemspris, bliver du automatisk medlem og får del i de mange fede fordele. De første 30 dage er gratis for nye brugere, og derefter koster det kun 99,-/md. Medlemskabet fornyes automatisk, og du kan altid opsige det. Læs mere om fordelene ved Saxo Premium her.

Machine Name: SAXO081