Talabarin da Turbin Karkashin Manantu na Mafi Yawan Tsawon Don RMUs a Cikin Ingantaccen Tsawo
1. Tasharadda Mekanisim na Manyan Jiki
Saboda yadda ake da suka shafi tsakiyar manyan jiki a cikin yanayin manyan jiki mai tsafta (RMUs), ba mekanisim mai manyan jiki na farko da take gudanar da hanyoyin uku za su iya tabbatar da ma'adinta uku kan adadin kadan. Saboda haka, mekanisim na manyan jiki da ake fuskantar a nan ya yi amfani da tasharadda mai zama mai uku da kuma mai sarrafa kai. Gida na tsakiyar manyan jiki na bako daya ta kasance da ake faɗi a kan gida na RMU kuma an haɓaka da mekanisim na manyan jiki a cikin tsarin kai a cikin kayan aikatau. Karamin kaya na mazaunin kaya ya yi a kan jerin kasa na mekanisim na manyan jiki na bako daya. Tsari na kula na mekanisim na manyan jiki mai sarrafa kai na bako daya ta bayyana a Nau'in 1, kuma bayyana abubuwan sa a cikin RMU na manyan jiki ta bayyana a Nau'in 2.
2. Tasharadda Mai Sarrafa Tsarin Mekanisim na Manyan Jiki
Mekanisim na manyan jiki mai sarrafa kai da ake fuskantar a nan ya yi amfani da tasharadda mekanisim na manyan jiki mai tsakanin hanyoyin uku. Ya yi amfani da hanyar mai sarrafa da ke kawo karamin kaya na capacitor a cikin mekanisim na manyan jiki. Tsari na tsarin mai sarrafa ta bayyana a Nau'in 3, inda C ta nufin capacitor da ake amfani da ita don sarrafa mekanisim na manyan jiki, R ta nufin mu'amala na hanyar na kaya na mekanisim, kuma L ta nufin mu'amala na inductance na kaya.
Siffarwar mai sarrafa mekanisim na manyan jiki mai tsakanin hanyoyin uku ta dace da tsari na tasharadda na differential equations wanda ake bayyana a Equation (1):
indamin i ta nufin karamin kaya na kaya (A); uC ta nufin karamin kaya na capacitor (V); R ta nufin mu'amala na hanyar na kaya (Ω); C ta nufin capacitance na capacitor (F); ψ ta nufin total magnetic flux linkage na electromagnetic system (Wb); m ta nufin equivalent mass na moving parts referred to the moving core (kg); x ta nufin displacement na moving core (m); v ta nufin velocity na moving core (m/s); Fx ta nufin electromagnetic force acting on the moving core (N); Ff ta nufin counteracting force on the moving core (N). Amfani da wannan tasharadda ta zama siffarwar mai sarrafa mekanisim na manyan jiki.
3. Tushen Mazauni
Abubuwa masu tushen mazauni a cikin circuit breaker na ring main unit sun hada da pressure na contact na arc extinguishing chamber da kuma tushen mazauni na opening spring na mekanisim na manyan jiki. Wannan tushen mazauni suna tushen a kan moving core na mekanisim na manyan jiki. Arcing chamber ta da distance na contact opening ta 9.5 mm da over-travel ta 2.5 mm, da total mechanism stroke ta 12 mm. Tushen mazauni na opening spring da contact spring suna cewa a kan motion stroke na mekanisim na manyan jiki, kuma tushen mazauni curve ta bayyana a kan data na musamman. Tushen mazauni equivalence points ta bayyana a Table 1.
4. Tasharadda Model na Simulation
Siffarwar mai sarrafa mekanisim na manyan jiki mai sarrafa kai ta fasahar da finite element method (FEM). Tsarin mai ban sha'awa da FEM ta nuna da ake kawo continuous solution domain zuwa elements na kula-kula da nodes. Ba a yi analysis na bako daya-bako daya, ake yi global assembly, kuma ake bayyana boundary conditions, kuma ake samu amsa a cikin computer computation. A nan, Ansoft finite element simulation software ta amfani don tasharadda model na mekanisim na manyan jiki, kuma material parameters na components suna set. Material na manyan jiki ta nufin NdFe35, kuma material na yoke ta nufin steel-1010.
Daga baya, coil parameters suna amfani: charging voltage na capacitor ta 110 V, capacitance ta 0.047 F, DC resistance na coil ta 5 Ω, number of turns ta 500, kuma inductance ta 0.0143 H. Saboda mekanisim na manyan jiki mai sarrafa kai ta fi tsakanin hanyoyin uku, tushen mazauni na opening operation ta sarrafa da tushen mazauni na opening spring. Saboda haka, ake buƙata ne karamin kaya mai sarrafa kai da karamin kaya mai sarrafa kai. Don ci gaba, ake yi amfani da 5 Ω DC resistor a cikin opening drive circuit.
Daga baya, surface and solid modeling and meshing ta amfani a cikin mekanisim na manyan jiki. Mesh na kula-kula ta amfani a key magnetic components kamar moving core, magnetic end caps, yoke, da manyan jiki, kuma mesh na kula ta amfani a non-magnetic parts.
5. Tasharadda Simulation and Experimental Results
Siffarwar mai sarrafa mekanisim na manyan jiki mai sarrafa kai ta fasahar da Ansoft simulations da actual product tests, kuma ake bayyana closing and opening current and stroke characteristics. Nau'in 5 ta bayyana closing current curve, da peak current ta 13.2 A. Nau'in 6 ta bayyana oscilloscope-measured closing current, da measured peak ta 14.2 A. Nau'in 7 ta bayyana closing stroke curve, da closing speed (average speed over the last 6 mm before contact closure) ta 0.8 m/s. Nau'in 8 ta bayyana oscilloscope-measured closing speed, ta 0.75 m/s. Abubuwan da aka bayyana sun nuna cewa siffarwar mai sarrafa mekanisim na manyan jiki mai sarrafa kai da ake fuskantar a nan ta dace da requirements na switchgear, kuma error between simulation and experimental results ta zama a cikin acceptable design range.
6. Tasharadda
A nan, ake fuskantar mekanisim na manyan jiki mai sarrafa kai don RMUs na manyan jiki. Closing and opening currents and mechanical stroke characteristics na mekanisim ta fasahar da computer simulation da actual product testing. Abubuwan da aka bayyana sun nuna cewa dynamic characteristic simulation model ta zama tasharadda na theory don practical permanent magnet mechanism design. Mekanisim na manyan jiki mai sarrafa kai ta fiye da amfani a cikin RMUs na manyan jiki, ta fiye da low drive current da kuma excellent mechanical performance kamar closing and opening speeds, ta dace da technical requirements. Yana ba da tasharadda na technology don future development of high-voltage synchronous phase selection switches.
