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 rated current 5A or 1A. Optional primary current ranges:15-200A、300A、400A、500-600A、800-1250A; accuracy combinations:0.2S/0.2S、0.2S/0.5S、0.2S/510P、0.5S/510P; rated output:0.2S:15VA,0.5S:15VA,510P10:20VA,510P20:15VA; short-time thermal current:31.5–80 kAS, rated dynamic stable current:80–160 kA, weight:23kg / 30kg corresponding to different structural specifications, ambient operating temperature -5℃~+40℃.
Indoor 12kV current transformer for protection and metering, suitable for medium voltage switchgear panels.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LZZBJ21-12-148-2s-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
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.
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, and 75kV lightning impulse withstand.
Q: What are the available accuracy classes?
A: Accuracy combinations include 0.2S/0.2S, 0.2S/0.5S, 0.2S/510P, and 0.5S/510P.
Q: Can this CT be used outdoors?
A: No, it is designed for indoor use only.
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 2s | Accuracy classCombined 4s | Accuracy class & rated output (VA) COSφ=0.8 0.2 (S) | Accuracy class & rated output (VA) COSφ=0.8 0.5 | Accuracy class & rated output (VA) COSφ=0.8 5 (10)P10 | Accuracy class & rated output (VA) COSφ=0.8 5 (10)P20 | Short-time thermal current Ith (kA/S) | Rated dynamic current Idyn (kA) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|
| 15~200 | — | — | — | — | — | — | 100 1In | 250 1In | 23/30 |
| 300 | 0.2(S)/0.2(S) | 0.2(S)/0.5(S) | 15 | 15 | 20 | 15 | 31.5 | 80 | 23/30 |
| 400 | 0.2(S)/5(10)P | 0.2(S)/5(10)P | 15 | 15 | 20 | 15 | 45 | 112.5 | 23/30 |
| 500~600 | 0.5(S)/5(10)P | 0.5(S)/5(10)P | 15 | 15 | 20 | 15 | 63 | 130 | 23/30 |
| 800-1250 | — | — | 15 | 15 | 20 | 15 | 80 | 160 | 23/30 |
Dimension & outline drawing of LZZBJ21-12-148-2s-4s — click image to zoom / view original.
