Outdoor 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 110 kV.

2  Technical Parameters for LGB-110W (1~3) Current Transformers

2.1  Rated voltage  110 kV

2.2  Highest voltage for equipment  126 kV

2.3  Rated primary current  50 A~2500 A

2.4  Rated secondary current  5 A or 1 A

2.5  Rated frequency  50 (60) Hz

2.6  20~50VA (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	200~500	600~800	1000~1600	2000~2500
Rated Short-time Thermal Current (rms) (kA), 3s	10.5	21	31.5	42	63
Rated Dynamic Current (Peak) (kA)	26.3	52.5	79	105	158

2.12 Arcing distance ≥1010 (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	≥2520	≥3150	≥3906