Solusyon ng Low-Voltage Current Transformer para sa mga Scenario ng Mataas na Prensiya na Komplikadong Waveform
Core Solution Concept
Nakawala sa mga limitasyon ng magnetic saturation, gumagamit ng prinsipyo ng electromagnetic induction para sa inobatibong disenyo. Nagpapahayag ng eksaktong pagsukat ng mataas na frequency na kuryente, DC components, at mataas na order harmonics, na nagreresolba ng mga isyu ng distortion ng tradisyonal na iron-core CTs sa mga komplikadong waveform scenarios.
Technical Solution Architecture
- Sensing Unit: Flexible Air-Core Rogowski Coil
- Structural Innovations
- High-precision enameled wire uniformly wound on a non-magnetic flexible former (e.g., epoxy/engineering plastic)
- Split-core mechanical design supporting live installation (suitable for retrofits and confined spaces)
- Signal Generation Principle
⚠ Output Signal: di/dt (Current Differential Value)
➡ Direktang sumasalamin sa rate ng pagbabago ng kuryente, na nag-iwas sa core hysteresis effects. - Signal Processing Unit: High-Performance Integrator Circuit
|
Core Module |
Technical Characteristics |
Performance Indicators |
|
Integrator Amplifier |
Ultra-low input bias current (≤1pA) |
Temp Drift: ±0.5μV/°C |
|
Integration Capacitor |
Polypropylene Film Capacitor (C0G grade) |
Capacitance Stability >99%@ -40~125°C |
|
Dynamic Compensation |
Adaptive feedback network |
Integrator Drift Suppression >40dB |
|
Bandwidth Extension |
Multi-stage active filtering |
Freq. Response: DC ~ 1MHz |
- ↳ Output Signal: Vout = k・I(t) (k is calibration factor, voltage linearly corresponds to current)
Core Advantages Over Traditional CTs
|
Pain Point Scenario |
Limitations of Traditional Iron-Core CTs |
Advantages of This Solution |
|
High Short-Circuit Current |
Measurement failure due to magnetic saturation |
No magnetic saturation |
|
DC Component |
Cannot measure steady-state DC |
Supports precise DC component measurement |
|
High-Frequency Harmonics |
High-frequency signal attenuation due to core losses |
<0.5% distortion @ 100kHz harmonic |
|
Complex Waveforms |
Phase delay and waveform distortion |
Group Delay <10ns |
|
Installation Flexibility |
Require power-off installation / Space-constrained |
Flexible split-core design, 3-second deployment |
Typical Application Scenarios
- Inverter Output Monitoring
- Precisely captures high-frequency oscillations caused by IGBT switching (e.g., 20-150kHz)
- Case: Harmonic analysis at a PV inverter plant, measurement error for 50th harmonic (2.5kHz) reduced from 12% to 0.8%.
- Arc Fault Detection
- Nanosecond response to microsecond-level pulse currents during arc initiation (>100A/μs)
- Application: Arc protection in data center distribution cabinets, response time shortened to 300μs.
- Electric Locomotive Traction Systems
- Simultaneous analysis of DC supply components and PWM carrier signals (carrier freq. 2-5kHz)
- Measured Data: Maintained Class 1 accuracy for DC 1500V + 4kHz ripple current.
Key Technical Parameters Summary
|
Item |
Parameter |
|
Measurement Range |
10mA ~ 100kA (Peak) |
|
Frequency Response |
DC – 1.5MHz (-3dB) |
|
Linearity Error |
≤ ±0.2% FS |
|
Mounting Bore |
Φ50mm ~ Φ300mm (Customizable) |
|
Operating Temp. |
-40℃ ~ +85℃ |
|
Safety Certs. |
IEC 61010, EN 50178 |
Solution Value Summary
Three-Dimensional Technological Breakthroughs:
- Physical Layer Innovation: Air-core structure completely eliminates magnetic saturation risk, lifespan increased 10x.
- Signal Layer Fidelity: 1MHz bandwidth + sub-microsecond response enables high-precision sensing for Energy IoT.
- Engineering Layer Convenience: Split-core design reduces O&M downtime costs by 90%.
