Inductive Current Transformer JGF high voltage

Inductive Current Transformer JGF high voltage

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Inductive Current Transformer JGF high voltage,
Current transformers type JGF are used in high voltage switchgear,
within the 245-550 kV range.
They transform high current into standardised,
equivalent values for meters, measuring and protection devices.

Features

  • High operating safety through optimal current distribution in the field-controlled bushing
  • Low weight and high creepage resistance through the use of composite insulators
  • High flexibility due to simple primary and secondary changeover
  • High operating safety through pressure relief with rupture disc

Technical data

Type JGF

245 300 330 362 420 550
Standard IEC / IEEE
Highest voltage for equipment kV 245 300 330 363 420 550
Rated power-frequency withstand voltage kV 460 460 460 575 630 680
Rated lightning impulse withstand voltage kV 1050 1050 1175 1175 1425 1550
Frequency Hz 50 / 60
Primary rated current A 5000
Secondary rated current A 1 / 5
Rated short-time thermal current [Ith] kA / 3 s ≤ 80
Rated dynamic current [ldyn] kA ≤ 200
Accuracy class 0.1-3; P; PR; PX; TPS; TPX; TPY; TPZ
Max. number of CT cores 8
Nominal operating / transport overpressure (20°C) bar 4 / 0.5

Type JGF

245 300 330 362 420 550
Height of unit* A mm 4197 4197 5370 5370 5700 6530
Height to primary terminal* B mm 3681 3681 4730 4730 5090 5890
Depth of unit including terminal box C mm 845 845 1088 1088 1088 1088
Depth of unit base D mm 749 749 1088 1088 1088 1088
Width of unit base E mm 436 436 1075 1075 1075 1075
Distance between screw holes at base F mm 600 600 900 900 900 900
Min. creepage distance*   mm 6700 7500 8250 9050 10500 13750
Gross weight, approx.*   kg 670 670 – – 1130 1200
Gas weight, approx.* kg 38 38 – – 47 50

 

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