Dry-type Current Transformers

Detailed Product Description

1 Possessing those advantages of light structure, oil-free, gas-free, porcelain-free, fire-proof and explosion-proof etc, it has been serviced in current measurement and relay protection in power system with the rated voltage of 35 kV.

2 Technical Parameters for LGB-35W (1~3)  Current Transformers

2.1 Rated voltage  35 kV

2.2 Highest voltage for equipment  40.5 kV

2.3 Rated primary current  50 A~4000 A

2.4 Rated secondary current  5 A or 1A

2.5 Rated frequency  50 (60) Hz

2.6 Rated output 

20~40VA (If any other rated output required, We can satisfy it.)

2.7 Accuracy class and accuracy classes combination

Steady accuracy classes are 0.2S, 0.2, 0.5S, 0.5, 5P, 10P, PR and PX; transient accuracy classes are TPS, TPX, TPY and TPZ. There are 1~6 pcs secondary windings in a CT. 

2.8 Instrument security factor (FS) of measuring class  5 or 10

2.9 Accuracy limit factor (ALF) of protective class  5, 10, 15, 20, 30 or 40

2.10 Rated continuous thermal current I_cth  1.2I_n

2.11 For rated short-time thermal current I_th (rms) and rated dynamic current I_dyn (peak), please see Table 1

Table 1

Primary Current (A)	50~150	200~300	400~600	800~1500	2000~4000
Rated Short-time Thermal Current (rms) (kA)	10.5	21	42	84	108
Rated Dynamic Current (Peak) (kA)	26.3	52.5	105	210	270

2.12  Arcing distance ≥410 (mm)

2.13  Creepage distance of outer insulation please see Table 2

Table 2

Pollution Protection Class	Class II (W1)	Class III (W2)	Class IV (W3)
Creepage Distancemm	≥810	≥1013	≥1256