Indoor single-phase epoxy resin casting current transformer complying with GB/T20840.1/2 and IEC61869-1/2 standards; rated insulation level 24/65/125kV, rated frequency 50/60Hz, rated secondary current 5A or 1A. Two optional structures: 2s and 4s, primary current optional range 20-3150A. 2s model weight is 43kg with rated output 15-30VA at different accuracy grades; 4s model weight is 70kg with rated output 15-30VA at different accuracy grades; short-time thermal current ranges 31.5-100kA, rated dynamic stable current ranges 80-160kA; ambient operating temperature -5℃~+40℃.
Indoor 24kV epoxy cast current transformer for MV switchgear, offering high thermal/dynamic stability with 2s/4s variants.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LZZBJ9-24-220b-2s-4s | Factory nameplate marking |
| Primary Voltage | 10kV | Rated voltage test (IEC 61869-1/3) |
| Secondary Voltage | 5A/1A | 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) | 12/42/75kV | Power-frequency & lightning impulse withstand |
| Standards | [On Request] | Certified to listed standards |
| Frequency | 50/60Hz | Per IEC 61869-1 |
| Environment | Ambient: -5℃~+40℃ | Per datasheet limits |
Ideal For
Not Recommended For
secondary terminals 1S1/1S2 (protection winding 2S1-2S2). Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary winding at one point. Follow IEC 61869-2 terminal markings.
Compliant with: [On Request]
S_total = ΣS_instrument + I₂² × (ρ × 2L / A)
Q: What is the insulation level of this CT?
A: The insulation level is 24/65/125kV, meaning 24kV system voltage, 65kV power-frequency withstand, and 125kV lightning impulse withstand.
Q: What are the available secondary currents?
A: The secondary current is 5A or 1A, selectable as per requirement.
Q: What is the difference between 2s and 4s models?
A: The 2s model weighs 43kg, while the 4s model weighs 70kg; both offer rated outputs of 15-30VA, but differ in primary current range and physical dimensions.
Missing fields are marked [On Request] — never fabricated. M2/M5/M6 verification rows follow IEC 61869 / IEEE C57.13 conventions.
| Rated primary current (A) | Accuracy classCombined | Accuracy class & rated output (VA) COSφ=0.8 | Short-time thermal current (kA/S) | Rated dynamic current (kA) | Weight (kg) |
|---|---|---|---|---|---|
| 20-200 | 0.2(S)0.2(S) 0.2(S)0.5 0.2(S)5P10 0.5(5P10) | 15/15, 20/20, 20/20, 15/15 | 150/1 | 375/1 | 43 |
| 300 | 0.2(S)0.2(S) 0.2(S)0.5 0.2(S)5P10 0.5(5P10) | 15/15, 20/20, 20/20, 15/15 | 31.5 | 80 | 43 |
| 400-500 | 0.2(S)0.2(S) 0.2(S)0.5 0.2(S)5P10 0.5(5P10) | 15/15, 20/20, 20/20, 15/15 | 45 | 110 | 43 |
| 600-800 | 0.2(S)0.2(S) 0.2(S)0.5 0.2(S)5P10 0.5(5P10) | 15/15, 20/20, 20/20, 15/15 | 63 | 130 | 43 |
| 1000-3150 | 0.2(S)0.2(S) 0.2(S)0.5 0.2(S)5P10 0.5(5P10) | 20/20, 30/30, 30/30, 20/20 | 100 | 160 | 43 |
Dimension & outline drawing of LZZBJ9-24-220b-2s-4s — click image to zoom / view original.
