>400kV Range
LQTT Series 500kV/500kVA Precision AC Test Transformer
Laboratory-Grade Accuracy for Ultra-High Voltage Applications
Core Specifications
| Parameter | Value | Industry Advantage |
|---|---|---|
| Rated Capacity | 500 kVA | Compact power density |
| Output Voltage | 500 kV | Highest standard test class |
| Output Current | 1 A | Precision measurement range |
| Frequency | 50 Hz | Global compatibility |
| Configuration | Single Phase, Cylindrical Tank | Optimized field deployment |
| Weight | 16,000 kg | 20% lighter than competitors |
Revolutionary Winding System
Triple-Winding Architecture
| Winding Type | Voltage | Current | Functionality |
|---|---|---|---|
| Excitation (2x) | 3 kV | 83.3 A | Configurable input (series/parallel) |
| High Voltage | 500 kV | 1 A | Precision test output |
| Accumulator | 3 kV | 83.3 A | Energy storage & stabilization |
Safety Integration
Ground-Fault Protection: HV terminal earthed via 5/5A CT (real-time current monitoring)
Surge Protection: Integrated 3kV arresters on excitation/transfer windings
Dielectric Safety: 550kV/60s overvoltage withstand (exceeds IEC 60060-1)
Performance Excellence
| Parameter | Specification | Test Standard |
|---|---|---|
| Partial Discharge (PD) | <5pC @ 500kV, <2pC @ 400kV | IEC 60270 |
| Waveform Distortion | ≤3% THD | IEEE 519 |
| Dielectric Loss (tan δ) | <0.5% | IEC 60894 |
| Noise Level | ≤60 dB @ 4m | ISO 3744 |
| Temperature Rise | Winding: ≤65K, Oil: ≤55K | IEC 60076-2 |
| Impedance Voltage | ≤10% | IEC 60076-5 |
Operational Capabilities
✅ **Duty Cycle:**
→ 100% load: 60 minutes ON / 60 minutes OFF
→ 80% load: Continuous operation
✅ **Robust Overload Protection:**
→ 150% current for 3 minutes (winding integrity guaranteed)
→ 110% voltage (550kV) for 60 seconds
✅ **Safety Compliance:**
→ 18kV/1min LV-to-earth insulation
→ Dual surge arresters
→ Oil injection/release ports
Technical Superiority
1. Unmatched PD Performance
Industry-leading <2pC PD at 400kV - essential for cable/GIS testing per IEC 62067
2. Precision Measurement
Integrated 1000:1 measurement winding enables ±0.1% voltage accuracy
3. Advanced Safety Systems
Ground-fault monitoring via HV CT (unique to LQTT series)
Dual-redundant surge protection
4. Thermal Resilience
Patented cooling design maintains 65K rise at 500kV - 20% better than industry average
Target Applications
Certification Labs: Type testing of 550kV class equipment
Cable Manufacturers: PD mapping of HVDC transmission cables
Research Institutions: Insulation material development
Utility Companies: On-site commissioning of EHV substations
Physical Specifications
🔹 **Dimensions:** Ø2100/Ø2400 × 4500 mm
🔹 **Weight:** 16,000 kg
🔹 **Cooling:** ONAN (Oil-Natural Air-Natural)
🔹 **Color:** Customizable (RAL palette)
🔹 **Connections:** Dual 3kV inputs + measurement taps
Compliance Statement
*"Engineered to exceed IEC 60060-1 and IEEE C57.12.00 standards for high-voltage test equipment. With revolutionary <2pC PD performance and integrated safety monitoring, this transformer delivers laboratory-grade precision in field-testing environments."*
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