VLF Cable Tan Delta Tester
Product Introduction
The VLF Cable Tan Delta Tester is a professional high-voltage diagnostic instrument designed for medium-voltage cable insulation testing.
It integrates 0.1Hz very low frequency (VLF) AC withstand voltage testing and Tan Delta (dielectric loss) measurement in one system, allowing users to evaluate both cable insulation strength and insulation aging condition.
The system is suitable for XLPE cables, PE insulated cables, PILC cables, and underground power cables, helping detect insulation deterioration caused by aging, moisture ingress, and water tree degradation before cable failure occurs.
It is widely used in power utilities, substations, cable manufacturers, electrical contractors, renewable energy projects, and testing laboratories.
Typical Applications
| Application |
Description |
| Cable AC Withstand Voltage Testing |
Verify insulation strength of medium-voltage power cables |
| Cable Tan Delta Measurement |
Evaluate insulation aging and dielectric loss condition |
| Cable Commissioning Testing |
Confirm cable quality before energization |
| Preventive Maintenance |
Detect potential insulation problems in aging cables |
| Underground Cable Diagnosis |
Assess insulation condition of buried power cables |
| XLPE / PE / PILC Cable Testing |
Suitable for different types of medium-voltage cables |
| Cable Sheath Testing |
Detect cable sheath insulation faults |
| Laboratory Testing |
Used for electrical testing and research applications |
Technical Specifications
Output Voltage
| Item |
VLF-34kV |
VLF-45kV |
| VLF Sine Output |
24kV RMS (34kV Peak) |
31.8kV RMS (45kV Peak) |
| DC Output Voltage |
±1–34kV |
±1–45kV |
| Resolution |
0.001kV |
0.001kV |
| Accuracy |
±1% |
±1% |
Output Current
| Item |
Specification |
| Measurement Range |
0–14mA |
| Resolution |
1μA |
| Accuracy |
±1% |
Maximum Cable Capacitance
| Frequency |
VLF-34kV |
VLF-45kV |
| 0.1Hz |
0.5μF @24kVrms |
0.5μF @31.8kVrms |
| 0.05Hz |
1.0μF @24kVrms |
1.0μF @31.8kVrms |
| 0.01Hz |
8.0μF @18kVrms |
5.0μF @22kVrms |
Tan Delta Measurement
| Item |
Specification |
| Test Voltage Range |
1–24kV RMS / 1–31.8kV RMS |
| Test Frequency |
0.1Hz |
| Load Capacitance |
1nF–8μF / 1nF–5μF |
| Resolution |
1*10⁻⁵ |
| Accuracy |
1*10⁻⁴ |
| Measurement Range |
1*10⁻⁴–9999.9*10⁻⁴ |
General Specifications
| Item |
Specification |
| Display |
Color LCD Display |
| Data Interface |
USB 2.0 |
| Weight |
Approx. 22kg |
| Dimensions |
430 * 240 * 340mm |
| Operating Temperature |
-10℃ ~ +50℃ |
Key Features
Integrated VLF Withstand Voltage & Tan Delta Testing
Combines VLF AC withstand voltage testing and dielectric loss (Tan Delta) measurement in one compact system, improving cable insulation testing efficiency.
Accurate Cable Insulation Diagnosis
Tan Delta measurement helps evaluate:
- Insulation aging
- Moisture ingress
- Water tree degradation
- Insulation deterioration
Multiple Output Modes
Supports:
- VLF sine wave output
- VLF rectangular wave output
- DC high voltage output
Meeting different cable testing requirements.
Intelligent Protection Function
Automatic protection against breakdown, overcurrent, and abnormal conditions improves operator safety during high-voltage testing.
Data Storage & Report Export
Stores test results internally and exports data through USB for testing records and report generation.
FAQ
What is a VLF Cable Tan Delta Tester?
A VLF Cable Tan Delta Tester is a high-voltage cable diagnostic instrument that combines 0.1Hz very low frequency AC withstand voltage testing and Tan Delta dielectric loss measurement.
It is used to verify cable insulation strength and evaluate insulation aging conditions.
What is the difference between VLF withstand testing and Tan Delta testing?
VLF withstand voltage testing checks whether cable insulation can withstand the required test voltage.
Tan Delta testing measures dielectric loss characteristics to evaluate insulation quality and identify problems such as aging, moisture, and water tree degradation.
Using both tests provides a more comprehensive cable insulation assessment.
What types of cables can be tested?
The system is suitable for:
- XLPE insulated cables
- PE insulated cables
- PILC cables
- Medium-voltage underground cables
- Distribution power cables
Why use VLF testing for medium-voltage cables?
VLF testing uses a very low frequency AC signal, which requires less power supply capacity than traditional power frequency AC testing and is suitable for field testing of long underground cables.
Does it support cable sheath testing?
Yes. The system supports cable sheath testing and sheath fault diagnosis with output voltage up to 10kV.
Can test reports be exported?
Yes. Test data can be stored internally and exported through USB for analysis, documentation, and maintenance records.
About Us
Wuhan Hongzhi Gaocetest Electrical Technology Co., Ltd. (HKVTEST)is a professional manufacturer specializing in high-voltage electrical testing equipment with more than 16 years of industry experience.
We focus on the research, development, and manufacturing of electrical diagnostic instruments, including:
- VLF cable test systems
- AC/DC withstand voltage testers
- Transformer testing equipment
- Relay protection testers
- Insulation resistance testers
- Cable fault locators
- Power system testing equipment
With professional R&D capability, advanced production facilities, strict quality control, and complete technical support, we provide reliable testing solutions for power utilities, substations, electrical contractors, industrial plants, renewable energy projects, and testing laboratories worldwide.
Contact Us
Wuhan Hongzhi Gaocetest Electrical Technology Co., Ltd.
Email: fionahuang60@gmail.com
WhatsApp: +86 180 7153 1810
Website: www.hkvtest.com
We will reply to your inquiry within 24 hours.
Our engineering team is ready to provide professional product recommendations, technical support, and customized high-voltage testing solutions.
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