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:20-200A、300-400A、500A、600-800A; accuracy combinations of 0.2S/10P、0.5S/10P with rated output 10VA0.2S、10VA0.5S、15VA10P. Matched short-time thermal current and rated dynamic current for each specification, net weight 17kg, operating temperature -5℃~+40℃, applied for metering and relay protection in medium-voltage switch cabinets.
Indoor 10kV epoxy cast current transformer for metering and protection in MV switchgear. Suitable for 50/60Hz systems with secondary 5A or 1A.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | IEC 61869 / GB/T 20840 |
| Model Code | LZZB-10 | Factory nameplate marking |
| Primary Voltage | 0.66kV | Rated voltage test (IEC 61869-1/3) |
| Secondary Voltage | 5A/1A | Ratio check at rated frequency |
| Accuracy Class | 5P/10P | 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) | [On Request] | Power-frequency & lightning impulse withstand |
| Standards | IEC 61869 / GB/T 20840 | Certified to listed standards |
| Frequency | 50/60Hz | Per IEC 61869-1 |
| Environment | [On Request] | Per datasheet limits |
Ideal For
Not Recommended For
Connect primary through bushing. Secondary terminals: 1S1-1S2 for metering, 2S1-2S2 for protection (if present). 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: IEC 61869 / GB/T 20840
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 highest voltage for equipment, 42kV power-frequency withstand, and 75kV lightning impulse withstand.
Q: Can this CT be used outdoors?
A: No, it is designed for indoor use only, as it is an indoor single-phase epoxy resin casting type.
Q: What accuracy classes are available?
A: It offers accuracy combinations of 0.2S/10P and 0.5S/10P, suitable for both metering and protection.
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 10P10 | Short-time thermal current Ith (kA/S) | Rated dynamic current Idyn (kA) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 20-200 | 0.2(S)/10P | 10 | 10 | 15 | 150 I1n | 375 I1n | 17 |
| 300-400 | 0.2(S)/10P | 10 | 10 | 15 | 45 | 112.5 | 17 |
| 500-600 | 0.5(S)/10P | 10 | 10 | 15 | 60 | 150 | 17 |
| 600-800 | 0.5(S)/10P | 10 | 10 | 15 | 60 | 150 | 17 |
Dimension & outline drawing of LZZB-10 — click image to zoom / view original.
