Indoor single-phase epoxy resin casting current transformer complying with GB/T20840.1/2 and IEC61869-1/2 standards; rated insulation level 40.5/95/185kV, rated frequency 50/60Hz, rated secondary current 5A or 1A. Optional primary current covers 20–3150A; accuracy-class rated outputs:30VA(0.2S/0.5S),30VA(0.5),50VA(5P10),40VA(5P15),30VA(5P20); short-time thermal current ranges 4–31.5kA, rated dynamic stable current ranges 10–130kA; product weight:112kg; ambient operating temperature -5℃~+40℃.
LZZBJ9-35 is a 35kV indoor epoxy cast current transformer for medium-voltage switchgear, offering multi-accuracy windings and high thermal/dynamic stability.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LZZBJ9-35-250b-4s | Factory nameplate marking |
| Primary Voltage | 15kV | 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
Connect primary through the bushing. Secondary terminals: 1S1-1S2 for metering, 2S1-2S2 for protection. 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 12/42/75kV, meaning 12kV system voltage, 42kV power-frequency withstand, 75kV lightning impulse withstand.
Q: Can this CT be used for both metering and protection?
A: Yes, it has multiple cores with accuracy classes 0.2S/0.5S for metering and 5P10/5P15/5P20 for protection.
Q: What is the weight and mounting type?
A: It weighs 112kg and is designed for indoor mounting, typically in switchgear panels.
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) COSφ=0.8 | Short-time thermal current Ith (kA/S) | Rated dynamic current Idyn (kA) | Weight (kg) |
|---|---|---|---|---|---|
| 20 | 0.2(5)/0.5/5P/5P | 30 30 50 40 30 | 4 1 | 10 | 112 |
| 30-40 | 0.2(5)/0.5/5P/5P | 30 30 50 40 30 | 4 2 | 10 | 112 |
| 50 | 0.2(5)/0.5/5P/5P | 30 30 50 40 30 | 12 1 | 30 | 112 |
| 75 | 0.2(5)/0.5/5P/5P | 30 30 50 40 30 | 16 1 | 40 | 112 |
| 100-150 | 0.2(5)/0.5/5P/5P | 30 30 50 40 30 | 25 1 | 63 | 112 |
| 200-300 | 0.2(5)/0.5/5P/5P | 30 30 50 40 30 | 31.5 1 | 80 | 112 |
| 400-600 | 0.2(5)/0.5/5P/5P | 30 30 50 40 30 | 31.5 2 | 80 | 112 |
| 800-1600 | 0.2(5)/0.5/5P/5P | 30 30 50 40 30 | 31.5 4 | 130 | 112 |
| 2000-3150 | 0.2(5)/0.5/5P/5P | 30 30 50 40 30 | [On Request] | [On Request] | 112 |
Dimension & outline drawing of LZZBJ9-35-250b-4s — click image to zoom / view original.
