1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Construction
6.1 Introduction
6.2 Packaging
6.3 Ceramic element structure
6.4 Ceramic element as a network
7 Modelling MOV non-linearity
7.1 Nonlinearity index
7.2 Resistance formula
7.3 MOV V-I characteristic graphs
7.4 Other non-linear resistance effects
8 Impedance properties and equivalent circuit
8.1 General
8.2 Non-linear resistance RV
8.3 Leakage resistance Rins
8.4 Capacitance CV
8.5 Linear resistance RG
8.6 Inductance LV
9 Ceramic element current and temperature distribution
9.1 Introduction
9.2 Thermal properties
10 Time factors
10.1 Initial response to an impulse
10.2 AC power frequency currents
11 Degradation and failure modes
11.1 Stresses that may cause degradation
11.2 Impulse current degradation
11.3 Failure criteria
11.4 Additional MOV behaviours and effects
12 Operation states and related performances
12.1 Typical operation states and basic requirements
12.2 Operational performances related to standby operation state
12.3 Operational performances related to surge suppression state
12.4 Operational performance related to TOV endurance state
12.5 Impulse life
13 Application examples
13.1 Introduction
13.2 Operation principles of a basic overvoltage protective system
13.3 Classification of applications of MOV's and standards
requirements
13.4 Connection modes of MOV in application circuits
13.5 Quantitative relationship between voltages of the MOV for power
circuitry protection
13.6 Series connection and parallel connection examples
Appendix I – Peak displacement and negative dynamic resistance
Bibliography