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VLF-TD
GOLD
Introduction：
VLF ultra-low frequency generator with dielectric loss testing combines withstand voltage testing and quantitative diagnosis of insulation aging. It can be used for cable completion and handover withstand voltage, as well as quantifying water tree, moisture, and aging defects through dielectric loss curves. It is widely suitable for power grid operation and maintenance, cable factories, third-party testing, and on-site testing of overseas power transmission and transformation projects.
Technical Parameters：
| Voltage/current accuracy: | ± 1% |
| Resolution： | 0.001kV/1 μ A |
| Dielectric loss tan δ: | range 1 × 10 ⁻ 4~9999.9 × 10 ⁻ 4, resolution 1 × 10 ⁻ 5, accuracy 1 × 10 ⁻ 4 |
| Whole machine weight: | 22kg |
| Size： | 430 × 240 × 340mm |
| Power consumption: | 34kV maximum 300VA/45kV maximum 400VA |
| Reverse protection threshold: | 34kV 13kV, 45kV 15kV |
| Data interface: | USB 2.0, supports USB storage and firmware upgrade |
Advantages：
Integrated native hardware for withstand voltage and dielectric loss, without the need for additional external modules: The machine is equipped with a high-precision synchronous sampling dielectric loss acquisition unit, which synchronously collects voltage, current, capacitance, and loss factor at a standard test frequency of 0.1Hz. It also has three automatic boost tests for tan δ at 0.5U0/1.0U0/1.5U0, without the need for secondary wire changes. Two sets of withstand voltage and aging diagnosis tests can be completed in one wiring, reducing the on-site construction period by half and lowering the cost of purchasing and transporting multiple instruments.
Adaptive variable frequency load algorithm, stable output of ultra long cables: equipped with a four level adjustable frequency intelligent matching system of 0.01/0.02/0.05/0.1Hz, the instrument automatically recommends the appropriate frequency based on cable capacitance to prevent overcurrent shutdown. The 34kV model supports a maximum cable load of 8 μ F, while the 45kV model supports long-distance cables of 5 μ F; Compared to models in the same price range with a fixed 0.1Hz load limit of only 0.5 μ F, cables that are tens of kilometers long in tunnels and suburban areas do not require segmented testing, greatly reducing the workload of repeated on-site wiring.
Fully automatic three-stage dielectric loss detection+intelligent cable rating system: Built in standardized dielectric loss judgment logic, automatically collects the mean and deviation values of tan δ under three voltage levels. The system automatically divides the cable health level into three levels: normal/attention/abnormal according to the national standard threshold, and provides maintenance and replacement suggestions synchronously, without the need for engineers to manually check and calculate standards; The entire testing process is automatically timed, boosted, stabilized, lowered, and discharged without human supervision, avoiding numerical errors caused by manual operation.
Partner
Contact us
Contact Person: Christine Gou
Mobile/Whatsapp/Wechat: +86 15123029885
Email: gold05@hy-industry.com
