>400kV Range
Core System Specifications
| Parameter | Value | Standard |
|---|---|---|
| System Configuration | Two-stage cascade (HCTT 500kV ×2) | Cylinder type |
| Rated Voltage | HV Output: 1000kV LV Input: 2×3kV | IEC 60060-1 |
| Rated Current | HV: 1A LV: 2×166.6A | IEEE C57.12.00 |
| Partial Discharge | <5pC @ 1000kV <2pC @ 700kV | IEC 60270 Class II |
| Waveform Distortion | ≤3% (System) | IEEE 432 |
| Dielectric Loss | <0.5% @ 20°C | IEC 60247 |
| Noise Level | ≤65dB(A) @ 4m | ISO 3746 |
Stage-Wise Technical Breakdown
1. Upper Stage Transformer (HCTT-500kVA/500kV)
- **Thermal Resilience:**
110% overvoltage (550kV/60s) without damage
- **Insulation Resistance:**
>2500MΩ (HV-LV-earth)
- **Duty Cycle:** 1hr ON / 1hr OFF ×8 cycles daily
- **Cooling:** ONAN (Oil Natural Air Natural)
- **Overload:** 120% current (1.2A) for 300s
2. Lower Stage Transformer (HCTT-500kVA/500kV)
- **Measurement System:** Dedicated measurement winding
- **Oil Specifications:**
- Dielectric loss <0.5% @ 20°C
- Acetylene-free
- **Insulation Tests:**
10kV/1min (LV-HV-shell)
- **Critical Protection:**
Integrated 5/5A CT for HV grounding
Certified Safety & Performance
Thermal Management:
Winding ΔT: <65K
Oil surface ΔT: <55K
Voltage Stability:
≤5% deviation in cascade modeProtection Systems:
Surge arresters on all excitation windings
Dual-stage oil injection/release valves
Environmental Resilience:
ONAN cooling for continuous 8-cycle operation
Compliance Framework
- **Partial Discharge:** IEC 60270 Class II
- **Insulation Coordination:** IEC 60071-1
- **Safety:** IEC 61010-1 Cat IV
- **Noise Emission:** ISO 3746:2010
- **Dielectric Testing:** ASTM D877
Operational Advantages
Extended Duty Cycle:
8×1hr full-load operations dailyPrecision Metrics:
≤4.5% waveform distortion (per stage)Diagnostic Capabilities:
PD monitoring down to 2pC at 700kVRobust Construction:
Industrial-grade cylinder design
Technical FAQs (Snippet-Optimized)
Q: Maximum daily operational duration at 1000kV?
A: 8 hours total (8×1hr cycles with 1hr cooling intervals).
Q: Calibration requirements for PD measurement?
*A: Semi-annual calibration per IEC 60270 using pulse injection method.*
Q: Ambient temperature limitations?
*A: Rated for -25°C to +45°C operation (IEC 60076-11).*
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