Inductive Current Transformer JOF high voltage,
Oil-paper insulated outdoor current transformers type JOF are used in high voltage networks,
within the 24-550 kV range.
They transform high current into standardised values for meters,
measuring and protection devices.
Features
- Precise electric field control and prevention of local partial discharges through fine graded bushing
- Higher safety through prevention of subsequent arcing
- High operating safety as there are no active parts in the insulator
- Minimum oil volume through optimised design
Technical data
Type JOF |
24 |
36 |
72 |
123 |
145 |
170 |
245 |
362 |
420 |
550 |
|
| Standard | IEC / IEEE | ||||||||||
| Highest voltage for equipment | kV | 24 | 36 | 72.5 | 123 | 145 | 170 | 245 | 362 | 420 | 550 |
| Rated power-frequency withstand voltage | kV | 50 | 70 | 140 | 230 | 275 | 325 | 460 | 510 | 630 | 680 |
| Rated lightning impulse withstand voltage | kV | 125 | 170 | 325 | 550 | 650 | 750 | 1050 | 1175 | 1425 | 1550 |
| Frequency | Hz | 16.7 / 50 / 60 | |||||||||
| Primary rated current | A | ≤ 4000 | |||||||||
| Secondary rated current | A | 1 / 5 | |||||||||
| Rated short-time thermal current [Ith] | kA / 1s | ≤ 63 | |||||||||
| Rated dynamic current [ldyn] | kA | ≤ 160 | |||||||||
| Accuracy class | 0.1-3; 0.2S; 0.5S; P; PR; PX; PXR; TPX; TPY; TPZ | ||||||||||
| Max. number of CT cores | 7 | ||||||||||
Type JOF |
24 |
36 |
72 |
123 |
145 |
170 |
245 |
362 |
420 |
550 |
||
| Height of unit* | A | mm | 1632 | 1632 | 1782 | 2256 | 2532 | 2631 | 3912 | 4440 | 4944 | 5644 |
| Height to primary terminal* | B | mm | 1186 | 1186 | 1336 | 1810 | 2086 | 2185 | 3248 | 3776 | 4280 | 4980 |
| Depth of unit including terminal box | C | mm | 725 | 725 | 725 | 725 | 725 | 725 | 851 | 851 | 851 | 851 |
| Depth of unit base | D | mm | 500 | 500 | 500 | 500 | 500 | 500 | 650 | 650 | 650 | 650 |
| Width of unit base | E | mm | 500 | 500 | 500 | 500 | 500 | 500 | 700 | 700 | 700 | 700 |
| Distance between screw holes at base | F | mm | 450 | 450 | 450 | 450 | 450 | 450 | 600 | 600 | 600 | 600 |
| Min. creepage distance* | mm | 1340 | 1340 | 1950 | 3080 | 3900 | 4394 | 8250 | 10230 | 11600 | 15260 | |
| Approximate weight* | kg | 220 | 220 | 230 | 285 | 295 | 300 | 830 | 800 | 900 | 1000 |
