EN
VLF-Series Portable VLF Hipot Test System with Advanced Safety Features
The Portable VLF Hipot Test System is engineered to cover the full lifecycle testing and diagnostic requirements for medium and high voltage (MV/HV) electrical assets, combining industry-leading portability, multi-functional test capabilities, and advanced safety features. It is the trusted field and laboratory solution for power utilities, industrial operators, renewable energy projects, and critical infrastructure sectors worldwide, with strict compliance with global cable testing standards.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The VLF-Series Hipot Test Systems are truly compact, portable VLF test sets engineered to accurately determine the insulation condition of medium voltage (MV) cables. Each unit in the series supports both VLF AC and DC withstand testing, along with cable sheath integrity testing and integrated sheath fault location capabilities. The design of the entire series fully complies with the international IEEE 400.2-2013 standard for VLF testing of shielded power cable systems.
These VLF Hipot Test Systems pair an ultra-compact, lightweight VLF test set with fully integrated Tan Delta (Dielectric Loss, tanδ) and Partial Discharge (PD) diagnostic modules, creating a fully scalable, all-in-one cable health assessment and diagnostic system.
Specifications
| Model |
VLF-34AD VLF-34TD VLF-34TPD |
VLF-45AD VLF-45TD VLF-45TPD |
VLF-68AD VLF-68TD VLF-68TPD |
VLF-84AD VLF-84TD VLF-84TPD |
VLF-93AD VLF-93TD VLF-93TPD |
| Input | 220V±5%，50/60Hz | ||||
| Output voltage frequency | 0.1Hz-0.01Hz automatic frequency conversion | ||||
| Output load capacity | ≤10µF | ≤10µF | ≤6µF (1~50kV), ≤5µF(>50kV) | ≤6µF (1~50kV), ≤5µF(>50kV) | ≤6µF (1~50kV), ≤5µF(>50kV) |
| Variable frequency generator | Power>3.5KW | Power>3.5KW | Power >5KW | Power>10KW | Power>10KW |
| Inner maximum protection voltage | Max.34kV peak | Max.45kV peak | Max.68kV peak | Max.84kV peak | Max.93kV peak |
| Output voltage (AC) | Max.34kVpeak, 24kVrms | Max.45kVpeak, 32kVrms | Max.60kV peak, 42kVrms | Max.80kV peak, 56kVrms | Max.90kV peak, 64kVrms |
| Output voltage (DC) | 0-34KV | 0-45KV | 0-60KV | 0-80KV | 0-90KV |
| Current range (AC) | 0-20mA | ||||
| Current range(DC) | 0-2000μA | ||||
| TD Test | |||||
| TD measurement range | 0.01×10-3 ~ 655.35×10-3 | ||||
| TD test voltage range | 1kV~rated voltage | ||||
| TD accuracy | 1% | ||||
| TD resolution | 1x10-5 | ||||
| Capacitance test range | 0.001μF–10μF | ||||
| Capacitance resolution | 0.001μF | ||||
| Capacitance accuracy | ≤±3％ | ||||
| Insulation resistance measurement range | 1MΩ-65535MΩ | ||||
| Insulation resistance resolution | 1MΩ | ||||
| Insulation resistance accuracy | ±10％ | ||||
| PD Test | |||||
| PD measurement range | 0-5000pc | ||||
| PD resolution | 1pc | ||||
| Sampling rate | 200MHz | ||||
| Discharge pulse frequency | 1KHz-2000KHz | ||||
| Others | |||||
| Type | Fully automatic step-up and step-down / manual fine-tuning | ||||
| Voltage resolution | 0.1kV | ||||
| Current resolution | AC: 0.1mA, DC: 1μA | ||||
| Voltage accuracy | ± 0.1kVrms ± 1.5% of reading | ||||
| Voltage positive and negative peak error | ≤±3% | ||||
| Waveform distortion | ≤3% | ||||
| Operation | Touch screen control | ||||
| Structural mode | Integrated | Integrated | Integrated | Split | |
| Dimension | 400*300*500 (mm) | 400*300*500 (mm) | 400*300*500 (mm) | Generator:400*×300×500(mm) Series booster:350*×250×450(mm) | |
| Weight | 34kg | 36kg | 43.5kg | Generator:34kg; Booster:42kg | |
| Usage conditions | Indoor and outdoor; Temperature: -10℃～+40℃; Humidity: ≤85％RH | ||||
Applications
MV/HV Power Cable Withstand Testing
- Acceptance and commissioning testing of new shielded XLPE, EPR, and paper-insulated power cables, to verify installation integrity and compliance with project specifications
- Routine preventive maintenance and periodic withstand testing of in-service underground and overhead cable networks, to detect early insulation degradation and avoid unplanned outages
- Post-repair verification testing of faulty cable sections, to confirm full restoration of insulation performance before re-energization
Cable Sheath Testing & Fault Location
- Integrity testing of cable outer sheaths and shielding layers, to identify physical damage, water ingress, and corrosion that cause premature cable failure
- High-precision pre-location and pinpointing of sheath faults, minimizing excavation and repair downtime for underground cable systems
Comprehensive Insulation Diagnostic Analysis
- Tan Delta (dielectric loss) measurement, to quantify overall insulation aging and widespread water tree degradation in cable systems
- Partial Discharge (PD) detection and localization, to pinpoint discrete insulation defects including voids, protrusions, and joint faults that cannot be identified by withstand testing alone
- Combined VLF withstand + PD + Tan Delta testing, for full condition assessment of cable assets in line with global predictive maintenance best practices
Dual VLF AC & DC Hipot Testing
- Standard 0.1Hz VLF AC withstand testing, the industry-recognized method for modern solid dielectric MV cables that avoids insulation damage caused by traditional DC hipot testing
- Optional DC hipot testing for legacy cable systems, rotating machinery, and other assets where DC testing is specified by industry standards
Rotating Machinery Insulation Testing
- Offline withstand and diagnostic testing of generator and motor stator windings in power plants and industrial facilities, to assess long-term insulation integrity
Advantages
- Industry-leading multi-layer redundant safety system for maximum operator and asset protection, fully compliant with global high-voltage safety regulations
- All-in-one integrated platform: VLF AC/DC hipot testing, sheath testing & fault location, plus optional Tan Delta & PD diagnostic modules
- 100% compliant with IEEE 400.2-2013 & IEC 60060-3 international standards, with globally recognized, high-precision test results
- Intuitive touchscreen interface with one-click automatic testing, minimizing human error and reducing operator training requirements
- Modular scalable design, enabling functional upgrades without full equipment replacement, delivering superior long-term TCO
- Rugged industrial-grade construction for reliable operation in harsh outdoor and industrial environments
FAQ
Q: What standards does the VLF-Series comply with?
A: The system is fully compliant with IEEE 400.2-2013 and IEC 60060-3 international standards, with globally recognized test results.
Q: What tests can the VLF-Series perform?
A: It supports VLF AC hipot testing, DC hipot testing, cable sheath integrity testing, sheath fault location, with optional Tan Delta and Partial Discharge diagnostic upgrades.
Q: What assets can the VLF-Series test?
A: It is designed for MV/HV XLPE/EPR power cables, generators, motors, switchgear, and other electrical insulation systems.
Q: What are the key safety features of the VLF-Series?
A: It has a multi-layer redundant safety system, including 10ms fast cut-off protection, dual-channel E-stop, ground continuity monitoring, arc fault detection, and high-voltage output interlock.
Q: Is the VLF-Series portable for field use?
A: Yes, it features an ultra-compact, lightweight design for single-person transport and operation, with an optional rechargeable battery pack for cordless off-grid use.
Q: Can non-specialist technicians operate the system?
A: Yes, it has an intuitive touchscreen interface with one-click IEEE-compliant automatic test presets, requiring minimal training for standard operation.
Q: Can the system generate and export test reports?
A: Yes, it has a built-in thermal printer for on-site printing, large-capacity data storage, and USB export of PDF/Excel compatible test reports with full traceability.
Q: Can I upgrade the system with diagnostic functions later?
A: Yes, the modular design supports future upgrades of Tan Delta and Partial Discharge modules without replacing the main unit, reducing long-term costs.
Q: What voltage models are available?
A: Standard 30kV to 80kV models are available, covering 6kV to 35kV mainstream MV cable testing needs, with customized higher voltage options.
