Resistive Capacitive Voltage Divider ROF highvoltage,
Resistive capacitive voltage dividers type ROF (RC divider) are used in high-voltage networks within the 72.5-550 kV range.
They divide the primary voltage into a standardised,
equivalent secondary voltage for meters,
measuring and protection devices.
Features
- Ferroresonance-free and no saturation effects
- Secondary output can be operated under short-circuit or no-load conditions
- AC and DC accuracy class ±0.1% @fR
- Measurement of harmonics possible up to 1 MHz
- Transient signals can be measured
- Accuracy with harmonics up to 10 kHz of ±0.2
Type ROF |
72 |
123 |
145 |
170 |
245 |
362 |
420 |
550 |
|
| Standard | IEC / IEEE | ||||||||
| Highest voltage for equipment | kV | 72.5 | 123 | 145 | 170 | 245 | 362 | 420 | 550 |
| Rated power-frequency withstand voltage | kV | 140 | 230 | 275 | 325 | 460 | 510 | 630 | 680 |
| Rated lightning impulse withstand voltage | kV | 325 | 550 | 650 | 750 | 1050 | 1175 | 1425 | 1550 |
| Frequency | Hz | 16.7 / 50 / 60 | |||||||
| Accuracy class | 0.1; 0.2; 0.5; 1.0; 3.0 | ||||||||
| Expanded frequency band | Hz | 15 – 10000 | |||||||
| Burden | R or R//C | ||||||||
| Burden range | ≥ 100 kΩ | ||||||||
| Rated voltage factors | 1.5 – 30 sec / 1.9 – 30 sec / 1.9 – 8 h | ||||||||
Type ROF |
72 |
123 |
145 |
170 |
245 |
362 |
420 |
550 |
||
| Height of unit* | A | mm | 1306 | 1606 | 1806 | 2006 | 2606 | 3371 | 3771 | 4571 |
| Height to primary terminal* | B | mm | 1186 | 1486 | 1686 | 1886 | 2486 | 3491 | 3891 | 4691 |
| Depth of unit including terminal box | C | mm | 725 | 725 | 725 | 725 | 725 | 725 | 851 | 851 |
| Depth of unit base | D | mm | 500 | 500 | 500 | 500 | 500 | 500 | 650 | 650 |
| Width of unit base | E | mm | 500 | 500 | 500 | 500 | 500 | 500 | 700 | 700 |
| Distance between screw holes at base | F | mm | 450 | 450 | 450 | 450 | 450 | 450 | 600 | 600 |
| Min. creepage distance* | mm | 1340 | 1340 | 1950 | 3080 | 3900 | 4394 | 8250 | 10230 | |
| Approximate weight* | kg | 220 | 220 | 230 | 285 | 295 | 300 | 830 | 800 |
