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Dry-type Current Transformers
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 66 kV.

2 Technical Parameters for LGB-66W (1~3) Current Transformers

2.1  Rated voltage  66 kV

2.2  Highest voltage for equipment  72.5 kV

2.3  Rated primary current  50 A~1500 A

2.4  Rated secondary current  5 A or 1 A

2.5  Rated frequency  50 (60) Hz

2.6  Rated output 

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 or10

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

2.10 Rated continuous thermal current Icth  1.2In

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

 

Table 1

Primary Current (A)

50~150

200~300

400~600

800~1500

Rated Short-time Thermal Current (rms) (kA)

10.5

21

42

84

Rated Dynamic Current (Peak) (kA)

26.3

52.5

105

210

2.12 Arcing distance ≥720 (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

≥1450

≥1813

≥2248

 


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