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 2500-5000A; multiple accuracy class combinations available with rated output ranging 20-30VA; product weight:60kg; ambient operating temperature -5℃~+40℃.
LMZB1-24 is a 24kV indoor current transformer for medium voltage switchgear, suitable for measurement and protection in 10kV systems. It offers high accuracy and compact design.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LMZB1-24 | 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 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. 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 LMZB1-24?
A: The insulation level is 12/42/75kV, meaning 12kV system voltage, 42kV power-frequency withstand, 75kV lightning impulse.
Q: Can it be used outdoors?
A: No, it is designed for indoor use only.
Q: What are the secondary ratings?
A: Secondary current is 5A or 1A, with rated output 20-30VA.
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 | Weight (kg) |
|---|---|---|---|
| 2500 | 0.2/5P20/5P20 0.5/5P10/5P20/5P20 0.2/5P10/5P20/5P20 0.2/5P20/5P20/5P20 | 30/30/30 30/30/30/30 20/30/30/30 20/25/25/25 | 60 |
| 3000 | 0.2/5P20/5P20 0.5/5P10/5P20/5P20 0.2/5P10/5P20/5P20 0.2/5P20/5P20/5P20 | 30/30/30 30/30/30/30 30/30/30/30 30/30/30/30 | 60 |
| 4000 | 0.2/5P20/5P20 0.5/5P10/5P20/5P20 0.2/5P10/5P20/5P20 0.2/5P20/5P20/5P20 | 30/30/30 30/30/30/30 30/30/30/30 30/30/30/30 | 60 |
| 5000 | 0.2/5P20/5P20 0.5/5P10/5P20/5P20 0.2/5P10/5P20/5P20 0.2/5P20/5P20/5P20 | 30/30/30 30/30/30/30 30/30/30/30 30/30/30/30 | 60 |
Dimension & outline drawing of LMZB1-24 — click image to zoom / view original.
