SF6 Current Transformers

Detailed Product Description

Technical Parameters for LVQB3-220W(1~3) Current Transformers

1  Rated voltage  220 kV

2  Highest voltage for equipment  252 kV

3  Rated primary current  300A~4000 A

4  Rated secondary current  5 A or 1 A

5  Rated frequency  50 (60) Hz

6  20~50VA (If any other rated output required, We can satisfy it.)

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 1~7 pcs secondary windings in a CT. 

8  Rated operating pressure of the gas SF6 is  0.40 MPa

9  Minimun operating pressure of the gas SF6 is  0.35 MPa

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

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

12 Rated continuous thermal current I_cth  1.2I_n

13 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)	300~800	1000~2500	3000~4000
Rated Short-time Thermal Current (rms) (kA), 3s	42	50	63
Rated Dynamic Current (Peak) (kA)	105	125	158

14 Arcing Distance ≥2010 (mm)

15 Creepage distance of outer insulation please see Table 2

Table 2

Pollution Protection Class	Class II (W1)	Class III (W2)	Class IV (W3)
Creepage Distance (mm)	≥5040	≥6300	≥7812