0.02Hz Very Low Frequency High Voltage Generator for Cross-island Cable Withstand Voltage Test

0.02Hz Very Low Frequency High Voltage Generator for Cross-island Cable Withstand Voltage Test

▎Product Highlights Overview

■High cost-performance ratio with significant cost advantages: 

Performance comparable to imported European and American brands, fully supports multi-frequency 0.01-0.1Hz ultra-low frequency withstand voltage testing, significantly reducing procurement budgets for Southeast Asian projects and eliminating the need to bear high import equipment premiums and long delivery times.

■Rugged and portable, suitable for cross-island operations in Southeast Asia: 

The controller and booster have a separate lightweight structure, and the protective chassis is resistant to bumps, making it suitable for island transportation and cross-island ferry transfers. It can be used stably at outdoor construction sites and substations.

■Multi-frequency output: Four frequency ranges: 

0.1Hz / 0.05Hz / 0.02Hz / 0.01Hz, adaptable to different cables, generators, and test capacitors, meeting the diverse testing needs of power fields in Southeast Asian countries.

■Comprehensive hardware protection mechanism: 

Dual fast overvoltage and overcurrent protection, closed-loop control to eliminate capacitance rise effect; automatic voltage boost, automatic timing, and automatic discharge at the end of the test reduce the risk of personnel misoperation.

■7-inch touchscreen color display for real-time waveform visualization; 

supports Chinese/English interface switching, local storage of historical test records, built-in thermal printing, and USB connection to a host computer for report export.

■Complies with DL/T849.4-2004 ultra-low frequency industry standard：

widely used for insulation withstand voltage acceptance and preventive testing of XLPE cross-linked cables and stator windings of large and medium-sized synchronous/asynchronous generators.

The Philippines, Malaysia, and Thailand, located in Southeast Asia, have numerous islands, and their power transmission and distribution networks extensively use cross-linked polyethylene (XLPE) power cables. Hydropower stations and thermal power projects are distributed across these islands. In cable commissioning, annual preventative testing, and insulation verification after generator overhauls, withstand voltage testing is the core method for assessing the insulation health of equipment.

Local engineering teams frequently face the following challenges:

1. High procurement costs, long ordering cycles, and slow after-sales support for spare parts in imported European and American ultra-low frequency equipment place significant budgetary pressure on small and medium-sized contractors.

2. Projects are spread across different islands, requiring frequent ferry and land transport of equipment. The bumpy journeys can easily cause hardware failures in ordinary precision instruments.

3. Cables and generators are large-capacity test samples. Traditional power frequency withstand voltage testing equipment is bulky and extremely difficult to transport on-site. DC withstand voltage can cause irreversible damage to cable insulation, and many Southeast Asian power grid standards explicitly discourage the use of DC withstand voltage as a cable handover method.

4. Field engineers come from multilingual environments, requiring equipment to support English operating interfaces and the rapid generation of paper reports for project acceptance.

5. High temperature and humidity outdoor environments and unstable power supply conditions at construction sites, with some sites using portable generators, necessitate instruments with good compatibility with power fluctuations.

Main Testing Capabilities

Applicable Test Objects

Core Functions

★Four Adjustable Output Frequencies: 0.1Hz / 0.05Hz / 0.02Hz / 0.01Hz, matching different test sample capacitances

★Fully Automatic Withstand Voltage Process: Self-test → Voltage Boost → Constant Voltage Holding → Automatic Shutdown + Automatic Discharge at the End of Timing

★Dual Hardware Protection for Overvoltage and Overcurrent, Protection Response Time ≤10ms, Rapidly Cuts Off High-Voltage Output in Case of Test Sample Breakdown

★Closed-Loop Negative Feedback Control, Eliminating Capacitive Rise Effect, Ensuring Stable High-Voltage Output Accuracy

★7-inch Touchscreen, Real-Time Display of Voltage, Current, and Sine Waveforms; One-Click Switching Between Chinese and English Languages

★The machine can save up to 64 complete test history records; Built-in Thermal Printer for On-Site Paper Report Issuance; USB Interface for Connecting to a PC for Archiving and Exporting Electronic Test Documents

Technical parameters

Ground voltage generator

Parts list