12kV indoor epoxy resin cast current transformer for KYN28 switchgear. Dual windings support 0.2S high-precision metering and 5P20/5P30 protection. Rated insulation level 12/42/75kV, 50/60Hz, secondary current 5A or 1A. Compliant with IEC 61869 and GB/T 20840 standards. Vacuum epoxy casting process, low partial discharge, moisture and salt-spray resistant. Available in A/B/C structural sizes, customizable ratio and accuracy class.
LZZBJ9-10GWA/B/C is a 12kV indoor epoxy cast current transformer for KYN28 switchgear, offering dual metering and protection windings with up to 0.2S accuracy.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | IEC 61869, GB/T 20840 |
| Model Code | LZZBJ9-10GWA-B-C | Factory nameplate marking |
| Primary Voltage | 12kV | Rated voltage test (IEC 61869-1/3) |
| Secondary Voltage | 5A or 1A | Ratio check at rated frequency |
| Accuracy Class | 0.2S, 0.5, 5P20, 5P30 | Accuracy test (IEC 61869-2 / IEEE C57.13) |
| Rated Burden | [On Request] | Burden test at rated VA |
| Insulation Type | Dry Epoxy Resin | Dielectric tests per standard |
| Insulation Level (BIL) | 12/42/75kV | Power-frequency & lightning impulse withstand |
| Standards | IEC 61869, GB/T 20840 | Certified to listed standards |
| Frequency | 50/60Hz | Per IEC 61869-1 |
| Environment | Indoor pillar-type epoxy resin cast | Per datasheet limits |
Ideal For
Not Recommended For
Connect primary terminals P1/P2 in series with the line. Secondary terminals: 1S1-1S2 for metering winding, 2S1-2S2 for protection winding. Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary winding at one point. Follow IEC 61869 terminal markings.
Compliant with: IEC 61869, GB/T 20840
S_total = ΣS_instrument + I₂² × (ρ × 2L / A)
Q: What is the insulation level of this CT?
A: The insulation level is 12/42/75kV, meaning 12kV system voltage, 42kV power-frequency withstand, and 75kV lightning impulse withstand.
Q: Can this CT be used for both metering and protection?
A: Yes, it has dual windings: one for metering (0.2S) and one for protection (5P20/5P30).
Q: Is this CT suitable for outdoor use?
A: No, it is designed for indoor use only, specifically for KYN28 switchgear.
Missing fields are marked [On Request] — never fabricated. M2/M5/M6 verification rows follow IEC 61869 / IEEE C57.13 conventions.
| Rated primary current I1n (A) | Accuracy classCombined | Accuracy class-Rated output (VA) 0.2S | Accuracy class-Rated output (VA) 0.5 | Accuracy class-Rated output (VA) 5P20 | Accuracy class-Rated output (VA) 0.5S | Accuracy class-Rated output (VA) 5P30 | Accuracy class-Rated output (VA) 0.5S | Model |
|---|---|---|---|---|---|---|---|---|
| 50E | 0.2S/0.5/5P20 | / | / | 10 | 10 | / | 10 | LZZBJ9-10GWA |
| 100S | 0.2S/0.5/5P20 | 10 | 10 | 10 | / | / | / | LZZBJ9-10GWA |
| 0.2S/0.5/5P20 | 10 | 10 | 10 | / | / | / | LZZBJ9-10GWB | |
| 200S | 0.2S/0.5/5P20 | 10 | 10 | 20 | / | / | / | LZZBJ9-10GWA |
| 0.2S/0.5/5P20 | 10 | 10 | 20 | / | / | / | LZZBJ9-10GWB | |
| 0.2S/0.5/5P20 | 10 | 10 | 20 | / | / | / | LZZBJ9-10GWC | |
| 300S | 0.2S/0.5/5P20 | 10 | 10 | 20 | / | / | / | LZZBJ9-10GWA |
| 0.2S/0.5/5P20 | 10 | 10 | 20 | / | / | / | LZZBJ9-10GWB | |
| 400S | 0.2S/0.5/5P20 | 15 | 15 | 20 | / | / | / | LZZBJ9-10GWC |
| 600S | 0.2S/0.5/5P20 | 15 | 15 | 20 | / | / | / | LZZBJ9-10GWA |
| 0.2S/0.5/5P20 | 15 | 15 | 20 | / | / | / | LZZBJ9-10GWB | |
| 1000-2500S | 0.2S/0.5/5P20 | 15 | 15 | 20 | / | / | / | LZZBJ9-10GWC |
| 0.2S/0.5/5P20 | 15 | 15 | 20 | / | / | / | LZZBJ9-10GWA | |
| 0.2S/0.5/5P20 | 15 | 15 | 20 | / | / | / | LZZBJ9-10GWB | |
| 1200-2500S | 0.2S/0.5/5P20 | 20 | 20 | 20 | / | / | / | LZZBJ9-10GWC |
| 0.2S/0.5/5P20 | 20 | 20 | 20 | / | / | / | LMZB3-10GWD | |
| 3000-4000S | 0.2S/0.5/5P20 | 20 | 20 | 20 | / | / | / | LMZB3-10GWE |
Dimension & outline drawing of LZZBJ9-10GWA-B-C — click image to zoom / view original.
