Stable electrical properties of ZnO varistor ceramics with multiple additives against the AC accelerated aging process
Source abstract
Abstract
Abstract The aging performance of zinc oxide (ZnO) varistors doped with aluminum and indium was investigated. Alternating current (AC) accelerated aging voltages of 0.85U1mA, 0.90U1mA and 0.95U1mA were applied to the doped varistors at a temperature of 115 °C for more than 1000 h. The electrical properties of the varistors before and after the aging process were evaluated by measuring their current–voltage, capacitance–voltage, and dielectric characteristics. The results showed that the ZnO varistor samples exhibited stable electrical properties under the applied aging conditions. Degradation rate coefficients (Kt) of 0.03, 0.05 and 0.06 were obtained at AC accelerated aging voltages of 0.85U1mA, 0.90U1mA and 0.95U1mA, respectively. The results indicated that the varistor ceramics should be able to operate safely and continuously under the given conditions for more than 110 years, which meets the requirements of surge arresters in power systems. These findings are important for improving the aging performance of ZnO varistors and the general security and stability of power systems.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: ZnO doping and properties · Gas Sensing Nanomaterials and Sensors · Transition Metal Oxide Nanomaterials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (22)
Show source-provided references
1. A grain-boundary defect model for instability/stability of a ZnO varistor10.1007/BF01113755 ↗
2. Application of zinc oxide varistors10.1111/j.1151-2916.1990.tb05232.x ↗
3. Effects of vapor with different chemical properties on corona partial discharges of stator windings10.1109/TDEI.2014.6832238 ↗
4. Improvement in nonlinear properties and electrical stability of ZnO varistors with B2O3 additives by nano-coating method10.1111/j.1551-2916.2011.04900.x ↗
5. He, J.L., Zeng, R., Tu, Y.P., et al., "Aging characteristics and mechanisms of ZnO nonlinear varistors". Proceedings of the 6th International Conference on Properties and Applications of Dielectric Materials, June 21-26, 2000, Xi’an, China.
6. Improving electrical properties of multiple dopant ZnO varistor by doping with indium and gallium10.1016/j.ceramint.2017.07.173 ↗
7. The roles played by Ag and Al dopants in controlling the electrical properties of ZnO varistors10.1063/1.359398 ↗
8. Thermally stimulated current in nonohmic ZnO ceramics10.1143/JJAP.16.195 ↗
9. Role of short-circuiting pathways in reduced ZnO varistors10.1063/1.335533 ↗
10. Advances in ZnO varistors in China during the past 30 years—fundamentals, processing, and applications10.1109/MEI.2015.7126072 ↗
11. Compositional changes adjacent to grain boundaries during electrical degradation of a ZnO varistor10.1063/1.331647 ↗
12. A mechanism of degradation in leakage currents through ZnO varistors10.1063/1.330433 ↗
13. Development of high gradient zinc oxide nonlinear resistors and their application to surge arresters10.1109/61.714482 ↗
14. High voltage gradient and low residual-voltage ZnO varistor ceramics tailored by doping with In2O3 and Al2O310.1016/j.ceramint.2016.09.032 ↗
15. An analytic approach to the degradation of double-Schottky barrier: theoretical prediction of VO0- Zni2+: Zni2+ as dominant mobile ion in ZnO electroceramic10.1016/j.scriptamat.2015.03.019 ↗
16. International electrotechnical commission · 2006
17. Degradation in ZnO varistors10.1088/0953-8984/5/33A/125 ↗
18. The effect of aluminum on electrical properties of ZnO varistors10.1111/j.1551-2916.2010.03787.x ↗
19. The electrical properties and d.c. degradation characteristics of silver doped ZnO varistors10.1007/BF01191983 ↗
20. Capacitance-vs-voltage characteristics of ZnO varistors10.1063/1.326411 ↗
21. Varistor ceramics10.1111/j.1151-2916.1999.tb01793.x ↗
22. An assessment of ageing of oxide varistors exposed to pulse hazards using dielectric spectroscopy