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),30VA(5P20),25VA(5P25),20VA(5P30); short-time thermal current ranges 25–150kA, rated dynamic stable current ranges 63–375kA; product weight:140kg; ambient operating temperature -5℃~+40℃.
Indoor 35kV class current transformer for medium-voltage switchgear, metering and protection. Suitable for 10kV systems with 5A/1A secondary.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LZZBJ9-35D1 | 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
connect primary through 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 circuit at one point only. 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.
Q: Can this CT be used for both metering and protection?
A: Yes, it offers multiple accuracy classes (0.2S/0.5S for metering, 5P20/5P25/5P30 for protection) with separate secondary windings.
Q: What is the maximum primary current rating?
A: Optional primary current covers 20–3150A, with short-time thermal current up to 150kA.
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 | 0.2(S)/0.5(S) | 0.5 | 5P20 | 5P25 | 5P30 | Short-time thermal current Ith (kA/S) | Rated dynamic current Idyn (kA) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|
| 20-100 | 0.2(S)/5P, 0.5(S)/5P, 0.2(S)/5P/5P, 0.2(S)/5P/5P/5P | 30 | 30 | 30 | 25 | 20 | 150 I1n | 375 I1n | 140 |
| 150 | 0.2(S)/5P, 0.5(S)/5P, 0.2(S)/5P/5P, 0.2(S)/5P/5P/5P | 30 | 30 | 30 | 25 | 20 | 25 | 63 | 140 |
| 200-250 | 0.2(S)/5P, 0.5(S)/5P, 0.2(S)/5P/5P, 0.2(S)/5P/5P/5P | 30 | 30 | 30 | 25 | 20 | 31.5 | 80 | 140 |
| 300-500 | 0.2(S)/5P, 0.5(S)/5P, 0.2(S)/5P/5P, 0.2(S)/5P/5P/5P | 30 | 30 | 30 | 25 | 20 | 31.5 | 80 | 140 |
| 600-800 | 0.2(S)/5P, 0.5(S)/5P, 0.2(S)/5P/5P, 0.2(S)/5P/5P/5P | 30 | 30 | 30 | 25 | 20 | 31.5 | 80 | 140 |
| 1000-3150 | 0.2(S)/5P, 0.5(S)/5P, 0.2(S)/5P/5P, 0.2(S)/5P/5P/5P | 30 | 30 | 30 | 25 | 20 | 31.5 | 80 | 140 |
Dimension & outline drawing of LZZBJ9-35D1 — click image to zoom / view original.
