Product Overview

The LQDZ-100kVA contact-type voltage regulator delivers precision voltage control from 0-420V with ±3% waveform distortion. Designed for industrial applications requiring stable high-current power supply, this unit features motor-driven adjustment and advanced thermal management with ONAN cooling. With 250A input capacity and robust short-circuit protection, it ensures reliable operation in demanding environments.

Technical Specifications

Electrical Parameters

Rated Capacity: 100kVA

Input Voltage: 0.4kV ±10%

Output Voltage: 0-0.42kV

Input Current: 250A

Output Current: 0-238.1A

Frequency: 50Hz

Regulation Performance

Waveform Distortion: ≤3% THD

Adjustment Method: Electrical drive (DC motor)

Linearity: Symmetrical compensation circuit

Regulating Speed: Programmable & stable

Short-Circuit Withstand: 5 cycles continuous

Thermal Management

Cooling System: ONAN (Oil Natural Air Natural)

Max Operating Time: 60 minutes at 100% load

Winding Temp Rise: ≤65K

Oil Surface Temp Rise: ≤55K

External Surface Temp Rise: ≤30K

Weight: 500kg

Core Features

Symmetrical Compensation Circuit

Proprietary reversed polarity voltage regulation maintains linear output characteristics with <3% THD even at full load conditions. Ensures voltage stability during step changes.

Precision Motor Drive

Single-phase DC servo motor enables smooth voltage adjustment with programmable speed control (1-10 seconds per volt). Integrated position indicator provides real-time tap position feedback.

Protection Systems

• Magnetic oil level indicator with auto-shutdown

• Multi-stage protection contacts

• Control system interlocks (regulator/control table/secondary switch)

• Thermal overload protection

• Short-circuit withstand capability

ONAN Cooling Technology

Natural oil convection cooling system ensures thermal stability in ambient temperatures up to 40°C. Optimized radiator design maintains safe operating temperatures during extended use.

Performance Data

65K

Max Winding Temp Rise

55K

Max Oil Temp Rise

3%

Waveform Distortion (THD)

Compliance & Standards

IEC

IEEE

ISO

CE

Meets international standards: IEC 60214-1 (Tap-changers), IEC 60076 (Power transformers), IEEE C57.12.00 (General requirements), and IEC 61000-3-6 (Emission standards). Full test reports available upon request.

Industrial Applications

Power Transformer Testing

Precision voltage control for dielectric tests and load testing of distribution transformers.

Semiconductor Manufacturing

Stable power supply for wafer processing equipment and cleanroom facilities.

EV Battery Testing

High-current voltage regulation for battery formation and testing systems.

High-Power Labs

Research and development facilities requiring precise high-voltage control.