Inductive Current Transformer JOF high voltage

Inductive Current Transformer JOF high voltage

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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

 

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