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. Two-winding and three-winding configurations are optional; primary current covers 20–2000A; multi accuracy classes including 0.2(S),0.5(S),10P10,10P20 with rated output ranging 15–50VA; two-winding type weight 50kg, three-winding type weight 95kg; ambient operating temperature -5℃~+40℃.
Indoor 35kV class current transformer for medium voltage switchgear; suitable for protection and metering in indoor applications.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LZZB-J7-35-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 transformer: connect primary in series with the line. 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. 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 40.5kV system; power-frequency withstand 95kV; lightning impulse withstand 185kV peak.
Q: What are the available secondary currents?
A: Secondary current is 5A or 1A.
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 | Rated secondary output (VA) | Short-time thermal current Ith (kA) | Rated dynamic current Idyn (kA) | Weight (kg) |
|---|---|---|---|---|---|
| 20 | 0.2/0.5(0.5)/0.5 0.5/0.5/0.5 0.2/0.5/0.5 0.2/0.5/0.5 | 15 15 25 | 1.3 | 3.25 | 95 |
| 30 | — | — | 2 | 5 | — |
| 40 | — | — | 3 | 7.5 | — |
| 50 | — | — | 4.5 | 11.5 | — |
| 75 | — | — | 6 | 15 | — |
| 100 | — | — | 8 | 22.5 | — |
| 150 | — | — | 12 | 30 | — |
| 200 | — | — | 16 | 45 | — |
| 300 | — | — | 20 | 50 | — |
| 400 | — | — | 25 | 63 | — |
| 500 | — | — | 36 | 90 | — |
| 600 | — | — | 40 | 100 | — |
| 800 | — | — | 50 | 125 | — |
| 1000-1500 | — | — | 63 | 160 | — |
| 1500-2000 | — | — | 80 | 200 | — |
Dimension & outline drawing of LZZB-J7-35-Q — click image to zoom / view original.
