Advanced Voltage Control for Demanding Applications

The LQDZ-175kVA/0.38kV contact voltage regulator delivers precision 0-650V adjustable output with ≤3% waveform distortion. Engineered with symmetrical compensation circuitry and reversed polarity voltage regulation, this industrial-grade solution ensures linear output for critical power testing and manufacturing processes.

Technical Specifications

Breakthrough Engineering Features

1. Precision Voltage Control

• DC Servo Motor Drive: Programmable adjustment speed (0.5-5V/sec)

• Symmetrical Compensation Circuit: Maintains linearity (±0.5% deviation)

• Reversed Polarity Design: Eliminates voltage transients during ramping

2. Robust Protection Systems

• 8-Cycle Short-Circuit Withstand: No winding damage after repeated discharges

• Triple-Sensor Monitoring: Magnetic oil indicator + Position contacts + Protection contacts

• Control Interlock: Prevents unauthorized operation (IEC 60204-1)

Overload Capability

Exceptional Performance Under Stress:

• 120% Load: Continuous 30-minute operation

• 140% Load: 15-minute sustained performance

• 160% Load: 5-minute peak capacity

Maintains ≤3% THD throughout overload conditions

Thermal Management System

• Cooling Method: ONAN (Oil Natural Air Natural)

• Continuous Operation: Unlimited runtime at 66% rated load

• Thermal Limits at 100% Load:

• Winding temperature rise: ≤65K

• Oil surface rise: ≤55K

• External surface rise: ≤30K

Industrial Applications

Optimized For:

• High-voltage cable testing facilities

• Transformer manufacturing quality validation

• Power electronics stress testing

• Research labs requiring precision voltage ramping

"The LQDZ-175kVA's linear impedance characteristics are essential for IEC 60076-3 temperature-rise testing in our certification lab."

Senior Test Engineer, ABB Power Solutions

Control & Monitoring Systems

• Integrated Servo Drive: Precision motor control with position feedback

• Magnetic Oil Indicator: Real-time dielectric fluid monitoring

• Terminal Position Contacts: Accurate voltage position signaling

• Secondary Switch Interlock: Safety-compliant operation control

Compliance & Certifications

• IEC 60076: Power transformers

• IEEE C57.12.90: Test code for liquid-immersed transformers

• IEC 61010-1: Electrical safety requirements

• EN 50588: Medium power transformers

Operational Advantages

1. Zero-Crossover Adjustment: Seamless voltage transitions without interruption

2. Extended Duty Cycle: 1-hour continuous operation at 100% load

3. Reduced Maintenance: Sealed tank design with moisture control

4. Precision Regulation: ±0.25% voltage stability under load variance