Induktiosulatusuuni teholaskenta

1. Tyristorin parametrilaskenta

The power of the steel pipe heating furnace is 1500KW, and the designed incoming line voltage is 500V. After calculation, the following data can be obtained.

Tasajännite Ud=1.35×500=675V

Tasavirta Id=1500000÷675=2200A

Välitaajuusjännite US=1.5×Ud =1000V

Pii-tasasuuntaajan nimellisvirta IF=0.38×Id÷2÷0.85=491A

(Jako kahdella yllä olevassa kaavassa johtuu siitä, että tasasuuntaajan osia on kaksi sarjaa)

Pii-tasasuuntaajan nimellisjännite UV = 1.414 × UL = 1.414 × 500 = 707 V

Invertterin piinimellisvirta IF=Id/2=1100A

Inverter silicon rated voltage UV=1.414×US=1414V

2. SCR-mallin valintakaavio

Tasasuuntaaja SCR valitsee KP1500A/2000V, eli nimellisvirta on 1500A ja nimellisjännite 2000V. Teoreettiseen arvoon verrattuna jännitemarginaali on 2.26-kertainen ja virtamarginaali 2.43-kertainen.

The inverter thyristor KK2500A/2000V of the intermediate frequency power supply, that is, the rated current is 2500A, and the rated voltage is 2000V. In addition, the inverter silicon is connected to the inverter bridge in a double-silicon series connection, so that the actual rated voltage of the thyristor on each inverter bridge arm is 5000V. Compared with the theoretical value, the voltage margin is 2.26 times, and the current margin is 2.15 times.

3. JOS resonanssikondensaattorikaappi

The intermediate frequency resonant capacitors of this set of capacitor cabinets are all electrothermal capacitors produced by Xin’anjiang Power Capacitor Factory, the model is RFM2 1.0 -2000-1.0S. Its capacity is 2000KVar, and the operating frequency is 1000Hz.

4. Induktiosulatusuunin teho lasketaan pw = tasajännite × tasavirta