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 covers 30–2000A; accuracy-class rated outputs:15VA(0.2S),15VA(0.2),15-30VA(0.5),20-50VA(10P10), paiReddish Brown multi-winding output options available; short-time thermal current ranges 63–150kA, rated dynamic stable current ranges 130–375kA; product weight:70kg; ambient operating temperature -5℃~+40℃.
LDJ1-35 is a 35kV indoor epoxy resin cast current transformer, suitable for medium voltage switchgear applications requiring accurate current measurement and protection.
| Parameter | Specification | Verification |
|---|---|---|
| Product Type | Current Transformer | [On Request] |
| Model Code | LDJ1-35 | 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 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. Ensure shorting and grounding before disconnecting secondary wiring.
Compliant with: [On Request]
S_total = ΣS_instrument + I₂² × (ρ × 2L / A)
Q: What is the insulation level of LDJ1-35?
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 options are 5A or 1A.
Q: What accuracy classes are available?
A: Accuracy classes include 0.2S, 0.2, 0.5, and 10P10 with various rated outputs.
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 | Rated secondary current | Short-time thermal current I1th (kA/S) | Rated dynamic current Idyn (kA) | Weight (kg) |
|---|---|---|---|---|---|---|
| 30-300 | 0.5/10P | 15 15 20 30 20/20 | 5A or 1A | 150 I1n | 375 I1n | 70 |
| 400 | 0.5/10P | 15 15 20 40 20/20 | 5A or 1A | 63 | 130 | 70 |
| 500 | 0.2/10P | 15 15 20 40 25/25 | 5A or 1A | 63 | 130 | 70 |
| 600-800 | 0.25/10P | 20 20 30 50 30/30 | 5A or 1A | 63 | 130 | 70 |
| 1000-1200 | 0.2/5 | 20 20 30 50 40/40 | 5A or 1A | 63 | 130 | 70 |
| 1500 | 10P/10P | 20 30 50 50 40/40 | 5A or 1A | 80 | 160 | 70 |
| 2000 | — | 20 30 50 50 50/50 | 5A or 1A | 80 | 160 | 70 |
Dimension & outline drawing of LDJ1-35 — click image to zoom / view original.
