Technical Article Content

1. Product Overview
The LQDZ Series 70kVA contact-type voltage regulator delivers precision voltage control (0-420V AC) for industrial power systems. Engineered with infinite variable speed adjustment and pure sinusoidal output, it ensures stable voltage supply for sensitive electrical testing applications.

2. Core Specifications

• **Rated Capacity:** 70kVA  
• **Input Voltage:** 400V AC ±10%  
• **Output Voltage:** 0-420V AC continuously adjustable  
• **Input Current:** 175A (max)  
• **Output Current:** 0-166.6A  
• **Frequency:** 50Hz  
• **Waveform Distortion:** <0.5% THD (pure sine wave)  
• **Zero Voltage Start:** Prevents inrush current

3. Critical Technical Features

• Contact-Type Regulation: Carbon brush/slip-ring design enables stepless voltage adjustment

• Instant Voltage Recovery: <20ms response to input fluctuations

• Thermal Management: Forced-air cooling (IP23 enclosure)

• Voltage Accuracy: ±1% of set value under full load

4. Physical Configuration

Dimensions: 800(W) × 860(D) × 1550(H) mm  
Net Weight: 300 kg  
Installation: Floor-mounted with vibration dampers  
Terminals: Copper busbars (100×10mm)

5. Industrial Applications

• Burn-in testing of HV transformers

• Variable-speed motor commissioning

• Laboratory power simulation

• Voltage tolerance testing per IEC 60068-2

6. Compliance & Safety

• Dielectric Strength: 3kV/1min (input-output)

• Insulation Resistance: >100MΩ @ 500VDC

• Protections: Overcurrent/overvoltage cutoffs

• Standards: IEC 61010-1, GB/T 10228