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:20–2500A, unified series parameter specification; thermal current 4–31.5kA, dynamic current 10–130kA; weight 70kg; ambient temperature -5℃~+40℃.
Indoor 35kV epoxy cast current transformer for medium-voltage switchgear, suitable for metering and protection up to 2500A primary.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LZZB8-35-Q | 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
For current transformers, connect primary terminals P1/P2 in series with the line. Secondary terminals are 1S1/1S2 for the main winding; if a protection winding exists, use 2S1/2S2. Never open-circuit the secondary of a CT while energized – hazardous voltage may occur. Ground the secondary circuit at one point only to avoid circulating currents. Follow IEC 61869-2 terminal markings and ensure shorting before disconnecting.
Compliant with: [On Request]
S_total = ΣS_instrument + I₂² × (ρ × 2L / A)
Q: What is the insulation level of this CT?
A: The rated insulation level is 40.5kV system voltage, with power-frequency withstand of 95kV and lightning impulse withstand of 185kV peak.
Q: Can this CT be used outdoors?
A: No, it is designed for indoor use only due to its epoxy resin casting and indoor construction.
Q: What secondary currents are available?
A: The secondary current is either 5A or 1A, as specified.
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 | Rated output (VA) 0.2 (S)/0.5S | Rated output (VA) 0.5 | Rated output (VA) 5P10 | Rated output (VA) 5P15 | Short-time thermal current Ith (kA/S) kA | Short-time thermal current Ith (kA/S) s | Rated dynamic current Idyn (kA) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|
| 20 | 0.2/0.5 0.2/5P 0.5/5P | 10 | 15 | 30 | 20 | 4 | 1 | 10 | 70 |
| 30-40 | 0.2/0.5 0.2/5P 0.5/5P | 10 | 15 | 30 | 20 | 4 | 2 | 10 | 70 |
| 50 | 0.2/0.5 0.2/5P 0.5/5P | 10 | 15 | 30 | 20 | 12 | 1 | 30 | 70 |
| 75 | 0.2/0.5 0.2/5P 0.5/5P | 10 | 15 | 30 | 20 | 16 | 1 | 40 | 70 |
| 100-150 | 0.2/0.5 0.2/5P 0.5/5P | 10 | 15 | 30 | 20 | 25 | 1 | 63 | 70 |
| 200-300 | 0.2/0.5 0.2/5P 0.5/5P | 10 | 15 | 30 | 20 | 31.5 | 1 | 80 | 70 |
| 400-600 | 0.2/0.5 0.2/5P 0.5/5P | 10 | 15 | 30 | 20 | 31.5 | 2 | 80 | 70 |
| 800-1600 | 0.2/0.5 0.2/5P 0.5/5P | 10 | 15 | 30 | 20 | 31.5 | 4 | 80 | 70 |
| 2000-2500 | 0.2/0.5 0.2/5P 0.5/5P | 10 | 15 | 30 | 20 | 31.5 | 4 | 130 | 70 |
Dimension & outline drawing of LZZB8-35-Q — click image to zoom / view original.
