VLF AC Hipot Test Set
As a trusted China VLF AC hipot tester supplier, we offer heavy-duty insulation diagnostic systems for power cables and generators. Built for compliance, accuracy, and worldwide power projects.
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15+
Years of R&D Experience
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6000+
Completed Project Cases
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CE/ISO
Full Export Certifications
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98.5%
Project Acceptance Rate
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VLF Tan Delta Test System & 0.1Hz Cable Diagnostic Device
The VLF Tan Delta test system, also widely known as the 0.1Hz VLF dielectric loss measurement device, is a highly specialized insulation status quantitative diagnostic equipment. It is exclusively engineered for testing capacitive high-voltage power assets, including XLPE power cables, generator stators, capacitive voltage transformers (CVT), and high-voltage capacitors.
This testing method provides reliable diagnostic data for global utility operators and contractors by quantifying the dielectric loss factor to uncover hidden insulation issues.
Why Choose 0.1Hz VLF Tan Delta Testing Technology?
Overcoming Equipment Size & Weight Constraints
Traditional line-frequency hipot testers are severely limited by specimen capacitance. Testing long-distance high-voltage cables requires massive, heavy equipment that is difficult to transport and wire.
The 0.1Hz VLF tan delta test system solves this issue. It requires only 1/50th of the power capacity compared to power-frequency testing. This allows engineers to conduct field tests on high-capacitance assets while dramatically reducing equipment weight and on-site labor pressure.
High Sensitivity to Hidden Insulation Defects
At 0.1Hz, internal conduction and interfacial polarization losses are amplified, making VLF dielectric loss measurement highly sensitive to latent faults in XLPE insulation like water trees, moisture, and joint delamination.
Accurate Defect Grading & Lifetime Assessment
Using stepped voltage to generate U-tanδ curves, it calculates ∆tanδ to grade insulation per IEEE 400.2 standards. It differentiates uniform aging from localized hazards, avoiding missed diagnoses and helping assess remaining cable life before breakdowns occur.
Core Advantages of Our VLF Tan Delta Test System
Our self-developed VLF tan delta integrated testing system combines an ultra-low frequency high-voltage generator with a high-precision dielectric loss measurement unit. Engineers can perform both VLF withstand testing and tanδ measurement with a single wiring connection, minimizing safety risks and accelerating on-site field testing schedules.
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Advanced Anti-Interference Algorithm
Delivers stable, reliable measurement precision even in harsh electromagnetic field environments, such as substations and cable trenches. This completely eliminates data drift and false readings.
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One-Click Comprehensive Testing Reports
Supports multi-stepped voltage automated data logging. It generates field-ready reports complete with tanδ values, U-tanδ curves, and ∆tanδ results that comply with international power utility archiving and project acceptance standards.
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Factory-Validated Reliability & Precision
Every unit undergoes rigorous multi-round high-voltage calibration and aging tests. Both high-voltage output stability and phase measurement accuracy are strictly benchmarked against IEEE 400.2 standards.
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Full-Cycle Diagnostic Technical Support
We offer customized customized testing plans, field-wiring guidance, testing curve interpretation, and data analysis training. We deliver complete cable insulation diagnostic solutions, not just equipment.
Typical Applications & Target Test Objects
High-Voltage & Medium-Voltage Power Cables
- XLPE Power Cables (10kV to 220kV): New cable commissioning tests, routine preventive maintenance diagnostics, and long-term cable water tree aging assessments.
- Cable Accessories: Detection of latent insulation defects in cable joints, splices, and cable terminations.
Rotating Machines & Substations Assets
- Generators & Motors: Insulation condition assessments for large-scale generator stator windings and high-voltage industrial motor coils.
- Capacitive Utility Assets: Field preventative inspections for Capacitive Voltage Transformers (CVT), high-voltage shunt capacitors, and other capacitive power assets.
Laboratory & Research Diagnostics
- Insulation Material Research: Dielectric property evaluation and multi-frequency tan delta sweep testing for insulation samples in research laboratories.
Detectable Insulation Defects
The 0.1Hz VLF tan delta test system is highly effective at identifying latent insulation vulnerabilities before catastrophic breakdowns occur, including:
- Water Tree Degradation: Severe water tree aging and propagation within XLPE power cables.
- Moisture Ingress: Overall moisture absorption and contamination in cable insulation layers.
- Insulation Degradation: Premature aging caused by internal impurities and voids.
- Interfacial Contamination: Material defects along the semi-conductive shield interface.
- Joint Delamination: Structural separation and layer peeling inside cable joints and splices.
- Internal Micro-Voids: Tiny air gaps and cavities formed during cable manufacturing or installation.
- Partial Discharge Precursors: Early-stage indicators of local electrical treeing and imminent failure.
FAQ
Q1: What is the main advantage of 0.1Hz VLF testing over standard 50/60Hz AC testing?
A: The primary advantage is the drastic reduction in equipment size and weight. Operating at 0.1Hz requires significantly less power and current, allowing field engineers to use portable testing sets instead of heavy transformer trucks.
Q2: Can a VLF Tan Delta test cause damage to a healthy power cable?
A: No, it is a non-destructive diagnostic method. Unlike DC testing which can damage XLPE insulation, VLF AC testing mimics normal operating stress without aggravating healthy insulation, only triggering breakdown if a critical defect already exists.
Q3: What criteria does our system use to grade insulation defects according to IEEE 400.2?
A: Our system benchmarks against IEEE 400.2 standards to continuously measure:
Mean Tan Delta tanδ: Evaluates overall global insulation aging.
Tan Delta Delta ∆tanδ: Pinpoints non-linear defect growth.
Differential Standard Deviation: Isolates localized anomalies from uniform degradation.
Q4: Is it possible to perform Tan Delta and VLF Withstand Testing at the same time?
A: Yes, via our Monitored Withstand Test (MWT) platform. Our integrated architecture allows engineers to perform the pass/fail withstand voltage test while simultaneously logging active tanδ data, potentially reducing overall testing duration.
Q5: Why is Tan Delta diagnostics necessary if the cable already passed a VLF Withstand Test?
A: A VLF Withstand Test is a go/no-go pass/fail test confirming the cable didn't break down today, but it cannot assess the degree of aging. Tan Delta provides quantitative data to evaluate remaining insulation lifetime and prioritize maintenance.
As one of the most professional vlf ac hipot test set manufacturers in China, we're featured by quality products and good price. Please rest assured to buy high quality vlf ac hipot test set in stock here and get quotation from our factory. Customized orders are welcome.
No Partial Discharge Power Frequency Test Device, 60kV Ultra low Frequency High Voltage Generator, 80kV Ultra low Frequency High Voltage Generator
