Indoor zero sequence current transformer for 35kV and below systems. Used for three-phase cable ground protection in small grounding current systems. Can also be used with relay protection devices. Rated frequency 50Hz or 60Hz. Available in Φ80 to Φ240 inner diameter sizes. Split design with clamp fastening, can be installed without power interruption. Compliant with IEC 61869 and GB/T 20840 standards. Epoxy resin cast construction, suitable for indoor installation.
Indoor split-core zero-sequence CT for 35kV systems, ideal for retrofit earth-fault protection on cables without service interruption.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | IEC 61869, GB/T 20840 |
| Model Code | LXK80-240 | Factory nameplate marking |
| Primary Voltage | Up to 35kV | Rated voltage test (IEC 61869-1/3) |
| Secondary Voltage | [On Request] | Ratio check at rated frequency |
| Accuracy Class | [On Request] | 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) | [On Request] | Power-frequency & lightning impulse withstand |
| Standards | IEC 61869, GB/T 20840 | Certified to listed standards |
| Frequency | 50/60Hz | Per IEC 61869-1 |
| Environment | [On Request] | Per datasheet limits |
Ideal For
Not Recommended For
For zero-sequence CTs, the three-phase cables must pass through the window together, with the secondary winding connected to a relay or protection device. Terminals are typically marked 1S1 and 1S2; ensure polarity is consistent with the protection scheme. Never open-circuit the secondary of a CT while energized - hazardous voltage may occur. Ground the secondary winding at one point to ensure safety and proper operation.
Compliant with: IEC 61869, GB/T 20840
S_total = ΣS_instrument + I₂² × (ρ × 2L / A)
Q: What is the maximum system voltage for this CT?
A: It is rated for systems up to 35kV, with insulation level to be confirmed for specific models.
Q: Can it be installed without power interruption?
A: Yes, the split-core design with clamp fastening allows hot-line installation.
Q: What inner diameters are available?
A: The CT is available in Φ80 to Φ240 mm inner diameter sizes.
Missing fields are marked [On Request] — never fabricated. M2/M5/M6 verification rows follow IEC 61869 / IEEE C57.13 conventions.
| Rated current ratio (A) | Accuracy class | Rated output (VA) |
|---|---|---|
| 60-75/1 | 10P5 | 2.5 |
| 100/1 | 10P5 | 3.75 |
| 150/1 | 10P5 | 2.5 |
| 200/1-300/1 | 10P10 | 3.75 |
| 400/1-600/1 | 10P10 | 5 |
| 100/5 | 10P5 | 2.5 |
| 150-200/5 | 10P5 | 2.5 |
| 300/5-400/5 | 10P10 | 3.75 |
| 500/5 | 10P10 | 5 |
| 600/5 | 10P10 | 5 |
Dimension & outline drawing of LXK80-240 — click image to zoom / view original.
