This block implements the model of a metal-oxide varistor (MOV) also called a surge arrester, typically used as protection against overvoltages for electrical equipment. The nonlinear nature of the MOV V-I curve is approximated by a piecewise linear function made up of up to 17 V-I points, including the zero point.
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| Parameters | |
|---|---|
| IVc | The current voltage characteristics input mode |
| IVt | The current voltage lookup table file |
| Snubber | |
| Rsn | Snubber resistance (Ω) |
| Csn | Snubber capacitance (F) |
...
where Nc is the number of columns.
| Parameters | |
|---|---|
| IVc | The current voltage characteristics input mode |
| Vref (V) | The protection voltage of the Surge Arrester block, in peak volts (V) |
| Nc | The number of metal-oxide disc columns; the minimum is one |
| Iref (A) | The reference current of one column used to specify the protection voltage, in peak amperes (A) |
| Segment 1 Characteristics | |
| k1 | k1 value in the equations |
| 𝛼1 | 𝛼1 value in the equations |
| Segment 2 Characteristics | |
| k2 | k2 value in the equations |
| 𝛼2 | 𝛼2 value in the equations |
| Segment 3 Characteristics | |
| k3 | k3 value in the equations |
| 𝛼3 | 𝛼3 value in the equations |
| Snubber | |
| Rsn | Snubber resistance (Ω) |
| Csn | Snubber capacitance (F) |
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