Indoor single-phase open-type self-powered current transformer, matched with passive microcomputer integrated protection devices. Power supply winding generates electric energy from primary current excitation to start protection equipment; power supply works normally when primary current exceeds 10% rated primary current, power factor COSφ=0.8.
LMZK-10PU is a self-powered open-core CT for indoor RMU applications, providing protection and metering with a built-in power winding. It suits 15kV systems with insulation level 18/55/105kV.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LMZK-10PU | Factory nameplate marking |
| Primary Voltage | 15kV | Rated voltage test (IEC 61869-1/3) |
| Secondary Voltage | [On Request] | Ratio check at rated frequency |
| Accuracy Class | 0.2/3P(6P)、0.5/3P(6P)、1.0/3P(6P) | Accuracy test (IEC 61869-2 / IEEE C57.13) |
| Rated Burden | 20VA(0.2),75VA(0.5),120VA(1.0),100VA(3P) | Burden test at rated VA |
| Insulation Type | Dry Epoxy Resin | Dielectric tests per standard |
| Insulation Level (BIL) | 18/55/105kV | Power-frequency & lightning impulse withstand |
| Standards | [On Request] | Certified to listed standards |
| Frequency | 50Hz / 60Hz | Per IEC 61869-1 |
| Environment | [On Request] | Per datasheet limits |
Ideal For
Not Recommended For
Connect primary conductor through the open core. Secondary terminals: 1S1/1S2 for metering, 2S1/2S2 for protection. The power supply winding terminals are [On Request]. Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary winding at one point.
Compliant with: [On Request]
S_total = ΣS_instrument + I₂² × (ρ × 2L / A)
Q: What is the insulation level of LMZK-10PU?
A: The insulation level is 18/55/105kV, meaning 18kV system voltage, power-frequency withstand 55kV, lightning impulse withstand 105kV peak.
Q: How does the self-powered feature work?
A: The built-in power winding generates energy from primary current to power passive protection devices, operating when primary current exceeds 10% of rated.
Q: What accuracy classes are available?
A: Accuracy classes include 0.2/3P, 0.5/3P, and 1.0/3P, with corresponding rated burdens up to 120VA.
Missing fields are marked [On Request] — never fabricated. M2/M5/M6 verification rows follow IEC 61869 / IEEE C57.13 conventions.
| Model | Rated primary current I1n (A) | Accuracy class & rated output (VA) COSφ=0.8 Protection winding10P10 | Accuracy class & rated output (VA) COSφ=0.8 Power supply winding | Dimensions Φd/ΦD/H |
|---|---|---|---|---|
| LMZK1250-10PU | 100/5 | 1 | 5 | 50/124/100 |
| LMZK1150-10PU | 200/5 | 1.5 | 5 | 50/110/100 |
| LMZK1150-10PU | 300/5 | 2.5 | 5 | 50/110/100 |
| LMZK1150-10PU | 400/5 | 3.75 | 5 | 50/110/100 |
| LMZK1150-10PU | 600/5 | 5 | 5 | 50/110/100 |
Dimension & outline drawing of LMZK-10PU — click image to zoom / view original.
