Title :
An Interrupting Capacity Model of Axial Magnetic Field Vacuum Interrupters with Slot Type Contacts
Author :
Liu, Zhiyuan ; Cheng, Shaoyong ; Zhang, Xuan ; Wang, Jimei ; Wang, Quan ; He, Guangli
Author_Institution :
State Key Lab. of Electr. Insulation & Power Equip., Xi´´an Jiaotong Univ.
Abstract :
This paper introduces a new interrupting capacity model for slot type axial magnetic field (AMF) vacuum interrupters (VIs), which is as I=k times D2 times Bz alpha. It means that interrupting capacity of a slot type AMF VI is proportional to contact area times alphath power of AMF. When contact gap increase, AMF weakens. Thus interrupting capacity decreases with increase of contact gap according to the model. The model is validated by short circuit current interruption tests with contact diameters of 48mm, 58mm and 66mm and contact gaps of 8mm, 11mm and 14mm. Even though there is some difference between the model predictions and experimental results, the model predictions are close to rated short circuit interrupting capacity of tested vacuum interrupters at contact gap of 8mm. More test results are needed to support the new model and AMF distribution should be considered to improve the model. After that, the new model is expected to be used until high voltage VIs that has long contact gaps
Keywords :
magnetic fields; vacuum interrupters; axial magnetic field; contact gap; interrupting capacity model; short circuit current interruption tests; slot type contacts; vacuum interrupters; Circuit testing; Dielectrics and electrical insulation; Interrupters; Magnetic fields; Magnetic flux density; Predictive models; Short circuit currents; Vacuum arcs; Vacuum technology; Voltage;
Conference_Titel :
Discharges and Electrical Insulation in Vacuum, 2006. ISDEIV '06. International Symposium on
Conference_Location :
Matsue
Print_ISBN :
1-4244-0191-7
Electronic_ISBN :
1093-2941
DOI :
10.1109/DEIV.2006.357290