SHARDA's surge protection capacitors are special types of capacitors. Its application is of a specialized nature i.e. in case of abnormal condition. These capacitors are designed for protection of large rotating General rating requires for rotating machines such as motors & generators. At the time of over voltage during electric storms produces surges to electrical equipment's connected to system. The voltage stress between turns of multi turn coil sets a limitation and surge voltage causes breakdown between turn to turn insulation resulting in short circuited turns. To protect from this situation surge capacitors are used.
These capacitor compliance with ISS std. 11548:1986.
| Rated Voltage | 4 kV AC to 60 kV AC |
| Rated Capacitance | 0.1 mFD to 0.5 mFD |
| No. of phase | 1 Ph or 3 Ph |
| Machine Voltage rating (kV / r.m.s.) |
Surge Capacitor Voltage rating (kV / r.m.s.) |
Capacitance (µF) |
Arrestor grounded (kV / r.m.s.) |
Arrestor effectively grounded (kV / r.m.s.) |
| 0.65 | 0.65 | 1.0 | 0.65/0.75 | 0.65/0.75 |
| 2.4 | 2.4 | 0.5 | 3.0 | 3.0 |
| 4.16 | 4.16 | 0.5 | 3.0 | 4.5 |
| 4.8 | 4.8 | 0.5 | 4.5 | 6.0 |
| 6.9 | 6.9 | 0.5 | 6.0 | 7.5 |
| 11.5 | 11.2 | 0.25 | 9.0 | 12.0 |
| 13.8 | 13.8 | 0.25 | 12.0 | 15.0 |
| Sr. No. | Description | Technical Details | ||
| 1 | Reference | Is 11548 - 1986 | ||
| 2 | Temperature | 50˚c | ||
| 3 | Frequency | 50Hz | ||
| 4 | Connection | 1f, 3f, D or U | ||
| 5 | Protection | Internal , External Fusing | ||
| 6 | Maximum Voltage | 110 % Of Rated Voltage | ||
| 7 | Rated Output | Highest System Voltage kV |
Surge Capacitor Voltage kV | Capacitance Per Phase μFD (Microfarads) |
| 3.6 | 6 | 0.5 and 0.5 | ||
| 7.2 | 12 | 0.25 and 0.5 | ||
| 12 | 18 | 0.25 and 0.5 | ||
| 24 | 28 | 0.25 | ||
| 36 | 40 | 0.125 &0.25 | ||
