Mangalên Têstkirina Pêşkemberanî yên Destpêkirina Transformerên Nîrgirî

Testi Impulsê Bêt-Birgînî ya Dîmenderên Nûvekirin

Ji bo dîmenderên nûvekirin, lêgerîn testên bixweber ên da ku bi standardên testê handover û testên protection/secondary system pêk bikin, testi impulsê bêt-birgînî ya dîmender ên ji ber energizasyonê formalkirin hatine dihat.

Bijêr Testi Impulsê Bikin?

1. Kontrolkirina Zaybên an Defektên Îzolation û Çavkanîya Dîmender û Rêzikê Wê

Heke dîmendera bêt-charge çewt bike, overvoltagesê switching dikarin bigere. Di sisteman de ku neutral pointan bêt-grounded ne an li wêre arc suppression coils grounded bin, overvoltage magnitudes dikarin 4-4.5 her phase voltage be; di sisteman de ku neutral pointan directly grounded ne, overvoltage magnitudes dikarin 3 her phase voltage be. Ji bo verastkirina ku îzolation strength ya dîmenderê digeretin full voltage an switching overvoltages, testi impulse bêt-birgînî ya dîmender ên piştî nûvekirinê hewce ye. Heke zaybên îzolation di dîmender an rêzikê wê de ne, wan divê heke breakdown li ser switching overvoltages bigere.

2. Kontrolkirina Maloperationa Protectiona Differential Dîmender

Heke dîmendera bêt-charge energize bike, magnetizing inrush current bigere, ku 6-8 her rated current be dikarin. Inrush current sêdandek li ser rast decay bike, tebiga 0.25-0.5 her rated current li ser 0.5-1 second, betaman decay complete dikare werdigere—sekanan zi re û medium dîmenderan, an 10-20 seconds ji bo dîmenderên mezin. Di dema decay initiala magnetizing inrush current de, protectiona differential maloperate dikare, ku prevent dîmendera energize bikin. Belkê, ji bo switching impulse bêt-charge, wiring, characteristics, û settings ya protectiona differential dikare pratik kontrol bikin ji bo influence ya magnetizing inrush current, ku evalyation û conclusion bike bikin ku hûn ên protectiona werdigere service bikin.

3. Evalyasyon kirina Mechanical Strength ya Dîmender

Bi rojname electrodynamic forces yên ku ji magnetizing inrush current gire, testi impulse bêt-charge hewce ye ji bo evalyasyon mechanical strength ya dîmender.

Bijêr Pêşkê Pêve Impulses?

Ji bo productên nûvekirinê, pêve impulses bêt-birgînî ya consecutive five hewce ne. Ji ber ku closing angle her switching moment jî din, corresponding magnetizing inrush currents din vêne—her wek yekîra, her wek yekîra. Her wek, five no-load switchings hewce ne ji bo test comprehensive insulation, mechanical strength, û operation of differential protection ya dîmender.

Cîna Magnetizing Inrush Current?

Cîna magnetizing inrush current:

• Contains significant non-periodic components, often causing the inrush current to be biased to one side of the time axis, with typically one phase opposite to the other two phases

• Contains substantial high-order harmonics, with the second harmonic component being the largest

• There are intermission angles between the inrush current waveforms

• The inrush current value is very large in the initial stage, reaching 6-8 times the rated current, and then gradually decays