Indoor single-phase epoxy resin casting current transformer complying with GB/T20840.1/2 and IEC61869-1/2 standards; rated insulation level 24/65/125kV, rated frequency 50/60Hz, rated secondary current 5A or 1A. Optional primary current covers 1500-6000A; accuracy-class rated outputs range 20-100VA for grades 0.2(S),0.5(S),5P10,5P15,5P20; product weight:102kg; ambient operating temperature -5℃~+40℃.
Indoor 20kV bushing-type CT for medium-voltage switchgear, suitable for metering and protection up to 6000A.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LMZB-20 | 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 busbar through the window. 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 markings.
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 outdoors?
A: No, it is designed for indoor use only.
Q: What secondary currents are available?
A: Secondary current is 5A or 1A.
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 | 0.2(S) | 0.5(S) | 5P10 | 5P15 | 5P20 | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 1500 | 0.2(S)/0.2(S)/5P 0.2(S)/0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P | 20 | 30 | 80 | 50 | 30 | 102 |
| 2000 | 0.2(S)/0.2(S)/5P 0.2(S)/0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P | 20 | 30 | 100 | 60 | 40 | 102 |
| 2500 | 0.2(S)/0.2(S)/5P 0.2(S)/0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P | 30 | 50 | 100 | 60 | 40 | 102 |
| 3000-6000 | 0.2(S)/0.2(S)/5P 0.2(S)/0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P | 30 | 50 | 100 | 80 | 50 | 102 |
Dimension & outline drawing of LMZB-20 — click image to zoom / view original.
