An open circuit permanent magnets saturated fault current limiter has the advantages of simple structure, low loss and low operating cost, and so that it has a good applied prospect. Permanent magnets may lose their magnetization at high temperatures. Therefore, it is great practical significant to carry out calculation and analysis of PMF- CL temperature field. For a linear PMFCL, the B-t curve of the magnetic flux density of a core over a period of time is obtained by using finite element software to analyze the magnetic field, and then the loss is calculated according to the B-P curve of the core, and the loss of the permanent magnet is taken into consideration to analyze the tempera- ture field at the conditions in which the normal working state and the extreme continuous fault state of the bus. The results of simulation shows that the permanent magnets of the novel current limiter are all in the temperature range of good magnetic state at the normal working state and the extreme continuous fault state of the bus, and thus during the transition of the bus fault in the middle of two steady states, PMFCL meets design temperature and magnetic properties so that this PMFCL has good thermal stability of magnetic field.
High Voltage Apparatus
fault current limiter