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ZXVLF High Voltage GeneratorAdvancing Precision and Safety in Power Equipment Te：
The ZXVLF Series Ultra-Low Frequency (ULF) High Voltage Generators represent a significant leap forward in power equipment testing technology. Designed to meet the stringent requirements of General Technical Conditions for Special Testing Instruments of Power Equipment, Part 4: Technical Specifications for ULF High Voltage Generators (DL/T 标准), this series integrates modern digital frequency conversion, microprocessor control, and fully automated operation to deliver unparalleled accuracy, safety, and efficiency in high-voltage insulation testing for transformers, cables, and rotating machinery.
Technical Innovations
1.Digital Frequency Conversion & Microprocessor Control
Unlike traditional mechanically modulated ULF systems, the ZXVLF series employs advanced digital signal processing to generate precise sinusoidal waveforms (0.02Hz–0.1Hz), eliminating waveform distortion and spark discharge risks. Its compact, all-electronic design reduces weight by 60–70% compared to conventional units, with controllers weighing only 4kg and modularized boosters for easy deployment.
2.High-Fidelity Measurement & Protection
a.Direct High-Side Sampling: Voltage, current, and waveform data are acquired directly from the high-voltage terminal via isolated sensors, ensuring ±1% measurement accuracy.
b.Dual-Band Protection:
Overvoltage Protection: Triggers shutdown <20ms when exceeding preset limits (30–80kV peak).
Hierarchical Overcurrent Protection: Combines high-side precision trip (configurable thresholds) and low-side backup protection (instant response to overloads).
c.Embedded Discharge Resistors: Integrated within boosters to eliminate external resistive loads, reducing field setup complexity.
3.Closed-Loop Feedback Control
The proprietary negative feedback system dynamically adjusts output to neutralize capacitance rise effects (容升效应), maintaining waveform stability even under reactive loads up to 5.5µF (0.02Hz).
Performance Specifications
| Model | Peak Voltage (kV) | Load Capacity (µF) | Fuse Rating | Weight (kg) |
| ZXVLF30 | 30 | 1.1@0.1Hz, 2.2@0.05Hz, 5.5@0.02Hz | 5A | Controller: 4; Booster: 25 |
| ZXVLF40 | 40 | 1.1@0.1Hz, 2.2@0.05Hz, 5.5@0.02Hz | 6A | Controller: 4; Booster: 35 |
| ZXVLF50 | 50 | 1.1@0.1Hz, 2.2@0.05Hz, 5.5@0.02Hz | 10A | Controller: 4; Booster: 50 |
| ZXVLF80 | 80 | 0.5@0.1Hz, 1.0@0.05Hz, 2.0@0.02Hz | 20A | Controller: 4; Stage-1 Booster:25; Stage-2:50 |
Field Applications
The ZXVLF series excels in:
1.XLPE Cable Testing: Detects insulation defects without damaging healthy sections, compliant with IEC 60502-2.
2.Transformer Turn-to-Turn Validation: Low-frequency withstand voltage testing at 0.1Hz minimizes capacitive losses.
3.Renewable Energy Systems: Portable design supports on-site testing for wind turbine generators and solar farm switchgear.
By resolving historical challenges of waveform distortion, excessive bulk, and energy waste in ULF testing, the ZXVLF series sets a new benchmark for reliability in power asset diagnostics. Its fusion of precision measurement, multi-tiered protection, and adaptive control algorithms positions it as an indispensable tool for utilities and OEMs striving to enhance grid resilience under evolving IEC and IEEE standards.
GDZX is a manufacturer of power detection equipment, offering a diverse range of products with comprehensive models and providing professional technical support. Contact us at +86-27-6552607 or +86-17396104357.Website: http://en.gdzxdl.com/
