Product overview
Current transformer type LB7 is based on hairpin design with oil-paper insulation and metallic expansion bellow, mainly for outdoor installations. It is a reliable product for metering and protection in high-voltage networks.
Model description
Technical parameters of products
| Type | unit | LB7-40.5 | LB7-72.5 | LB7-126 | LB7-145 | LB7-170 | LB7-245 LB7-252 |
|---|---|---|---|---|---|---|---|
| Highest voltage | kV | 40.5 | 72.5 | 126 | 145 | 170 | 245252 |
| Rated current | A | 2 * 50-2*1000, 100-2000 | 2*50-2*1500, 100-3150 | 2*50-2*2000, 100-4000 | 2*50-2*2000, 100-4000 | ||
| Short-time thermal current | kA/s | 100 |pr/1-50/3 | 45-50/3 | 45-50/3 | 50-63/3 | ||
| Rated dynamic current | kA | 250 lpr-125 | 115-125 | 115-125 | 125-160 | ||
| Rated insulation level | kV | 40.5/95/200 | 72.5/160/350 | 126/230/550 | 145/275/650 | 170/325/750 | 252/460/1050 |
| Dielectric dissipation factor | \ | ≤0.02 | ≤0.005 | ≤0.005 | ≤0.005 | ≤0.005 | ≤0.005 |
| Rated secondary current | A | 1,5 | |||||
| Rated frequency | Hz | 50/60 | |||||
| Measurement and protection accuracy class | \ | IEC 61869-2 0.1,0.2S, 0.5S, 0.2, 0.5/5P, 5PR, 10P, 10PR, PX, PXR, TPZ, TPX, TPY\nIEEE C57.13 0.15, 0.15S, 0.3, 0.6, 1.2/C100, C200, C400, C800, X | |||||
| Rated burden and instrument security factor of measuring class | \ | 1-200 VA, Fs≤5 | |||||
| Rated burden and accuracy limit factor of protective class | \ | 1 -200 VA, 5P10- 5P40/10P10-10P40 | |||||
| Insulator creepage distance | mm/kV | ≥25, 31 | |||||
