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 220 kV.
2 Technical Parameters for LGB-220W (1~3) Current Transformers
2.1 Rated voltage 220 kV
2.2 Highest voltage for equipment 252 kV
2.3 Rated primary current 300 A~4000 A
2.4 Rated secondary current 5 A or 1A
2.5 Rated frequency 50 (60) Hz
2.6 Rated output 20~50 VA (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 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) | 300~800 | 1000~2500 | 3000~4000 |
Rated Short-time Thermal Current (rms) (kA), 3s | 31.5 | 42 | 50 |
Rated Dynamic Current (Peak) (kA) | 80 | 105 | 125 |
2.12 Arcing distance ≥2010 (mm)
2.13 Creepage distance of outer insulation please see Table 2
Table 2
Pollution Protection Class | Class II | Class III | Class IV |
Creepage Distancemm | ≥5040 | ≥6300 | ≥7812 |
