Indoor single-phase epoxy resin casting current transformer complying with GB/T20840.1/2 and IEC61869-1/2 standards, insulation level 12/42/75kV, rated frequency 50/60Hz, secondary current 5A or 1A. Optional primary current ranges:5-15A、20A、30-40A、50-60A、75A、100-200A、300-400A、500-600A、800A; accuracy combination 0.2S/5P、0.5S/5P with multiple rated output options. Matched thermal and dynamic withstand parameters for different specifications, net weight 21kg, operating ambient temperature -5℃~+40℃.
Indoor 12kV epoxy cast current transformer for medium-voltage switchgear, suitable for metering and protection up to 800A.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LFZZJ-12 | Factory nameplate marking |
| Primary Voltage | 0.66kV | Rated voltage test (IEC 61869-1/3) |
| Secondary Voltage | 5A | Ratio check at rated frequency |
| Accuracy Class | 0.2S/0.5S | Accuracy test (IEC 61869-2 / IEEE C57.13) |
| Rated Burden | 5VA | 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 | [On Request] | Certified to listed standards |
| Frequency | 50/60Hz | Per IEC 61869-1 |
| Environment | [On Request] | 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 conventions.
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 offers accuracy combinations 0.2S/5P or 0.5S/5P, suitable for both metering and protection.
Q: What is the rated secondary current?
A: The secondary current is 5A (or 1A optional).
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 0.2 (S) | Accuracy class & rated output (VA) COSφ=0.8 0.5 (S) | Accuracy class & rated output (VA) COSφ=0.8 5P10 | Accuracy class & rated output (VA) COSφ=0.8 5P15 | Short-time thermal current I1n (kA/S) | Rated dynamic current Idyn (kA) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| 5-15 | 0.2(S)/5P 0.5(S)/5P | 10 | 10 | 15 | 10 | 150/1tn | 375/1tn | 21 |
| 20 | 0.2(S)/5P 0.5(S)/5P | 10 | 10 | 15 | 10 | 5 | 12.5 | 21 |
| 30-40 | 0.2(S)/5P 0.5(S)/5P | 10 | 10 | 15 | 10 | 8 | 20 | 21 |
| 50-60 | 0.2(S)/5P 0.5(S)/5P | 10 | 10 | 15 | 10 | 10 | 25 | 21 |
| 75 | 0.2(S)/5P 0.5(S)/5P | 10 | 10 | 15 | 10 | 16 | 40 | 21 |
| 100-200 | 0.2(S)/5P 0.5(S)/5P | 10 | 10 | 15 | 10 | 20 | 50 | 21 |
| 300-400 | 0.2(S)/5P 0.5(S)/5P | 10 | 10 | 15 | 10 | 25 | 63 | 21 |
| 500-600 | 0.2(S)/5P 0.5(S)/5P | 20 | 20 | 20 | 15 | 31.5 | 80 | 21 |
| 800 | 0.2(S)/5P 0.5(S)/5P | 20 | 20 | 25 | 15 | 31.5 | 80 | 21 |
Dimension & outline drawing of LFZZJ-12 — click image to zoom / view original.
