Ngokusekelwe kokuhlangenwe nakho kwekhwalithi yamandla, uma sikhethaisihlungi se-harmonic esisebenzayo, amafomula amabili avame ukusetshenziselwa ukulinganisa umthamo wokucindezelwa kwe-harmonic.
1.Ukubusa okumaphakathi: Linganisa amandla okumisa okubusa okuvumelanayo okusekelwe ekuhlukaniseni imboni namandla e-transformer.
S---- Umthamo olinganiselwe we-Transformer, U---- I-voltage elinganiselwe ohlangothini lwesibili lwe-U-transformer
Ih---- I-Harmonic current, i-THDi----Inani lamanje lokuhlanekezela eliphelele, nohlu lwamanani anqunywa ngokusekelwe ezimbonini ezihlukahlukene noma imithwalo
K---- Izinga lokulayisha i-Transformer
| Uhlobo lwemboni | Izinga elijwayelekile lokuhlanekezela i-harmonic |
| I-Subway, Imigudu, izitimela ezihamba ngesivinini esikhulu, Izikhumulo zezindiza | 15% |
| Ukuxhumana, izakhiwo zezentengiselwano, Amabhange | 20% |
| Imboni yezokwelapha | 25% |
| Ukukhiqiza izimoto, ukukhiqizwa kwemikhumbi | 30% |
| Chemical\Petroleum | 35% |
| Imboni ye-Metallurgical | 40% |
2.Ekubusweni kwesayithi: Linganisela amandla okumisa okuphatha okuvumelanayo okusekelwe kumasevisi ahlukene okulayisha.
Ih---- I-Harmonic yamanje, iTHDi----Inani lamanje lokuhlanekezela eliphelele, ngobubanzi bamanani anqunywa ngokusekelwe ezimbonini ezihlukahlukene noma imithwalo
K--- Izinga lokulayisha i-Transformer
| Uhlobo lokulayisha | Okuqukethwe kwe-harmonic okujwayelekile% | Uhlobo lokulayisha | Okuqukethwe kwe-harmonic okujwayelekile% |
| I-Inverter | 30---50 | Ukunikezwa kwamandla okushisisa imvamisa emaphakathi | 30---35 |
| Ikheshi | 15---30 | Isilungisi senhliziyo esiyisithupha | 28---38 |
| Izibani ze-LED | 15---20 | I-pulse rectifier eyishumi nambili | 10---12 |
| Isibani sokonga amandla | 15---30 | Umshini wokushisela ugesi | 25---58 |
| I-ballast ye-elekthronikhi | 15---18 | I-air conditioning eshintshashintshayo | 6----34 |
| Ishintsha ukunikezwa kwamandla kwemodi | 20---30 | I-UPS | 10---25 |
Qaphela: Izibalo ezingenhla zingamafomula okulinganisa kuphela okubhekisela kuwo.
Lapho sikhethai-static var generator, amafomula amabili avame ukusetshenziswa ukulinganisa umthamo wesinxephezelo samandla asebenzayo.
1.Isilinganiso esisuselwe kumthamo we-transformer:
U-20% kuya ku-40% womthamo we-transformer usetshenziselwa ukulungisa umthamo wesinxephezelo samandla asebenzayo, ngokukhethwa okujwayelekile kwama-30%.
Q=30%*S
Q----Umthamo wesinxephezelo samandla asebenzayo, S----Umthamo we-Transformer
Isibonelo, i-transformer engu-1000kVA ifakwe isinxephezelo samandla asebenzayo angu-300kvar.
2.Bala ngokusekelwe kusici samandla namandla asebenzayo wezinto zokusebenza:
Uma kukhona amapharamitha wokulayisha anemininingwane, njengamandla aphezulu asebenzayo P, isici samandla i-COSO ngaphambi kwesinxephezelo, kanye nesici samandla esiqondiwe se-COSO ngemva kwesinxephezelo, umthamo wangempela wesinxephezelo odingekayo ohlelweni ungabalwa ngokuqondile:
Q----Umthamo wesinxephezelo samandla asebenzayo, P----Amandla asebenzayo aphezulu
K----Isilinganiso sokulayisha i-coefficient(ngokuvamile sithathwa njengo-0.7--0.8)
Qaphela: Izibalo ezingenhla ezereferensi kuphela.
I-Noker Electric izibophezele ekunikezeni amakhasimende isinxephezelo samandla asebenzayo asebenzayo kanye nezixazululo zokulawula i-harmonic, noma yimiphi imibuzo ekukhetheni umkhiqizo, zizwe ukhululekile ukusithinta.
Isikhathi sokuthumela: Dec-08-2023