HGXL-2020 Frequency-Independent Line Parameter Tester with Variable-Frequency

The HGXL-2020 Frequency-Independent Line Parameter Tester is a high-precision instrument designed for on-site measurement of power-frequency parameters for various high-voltage transmission lines (overhead, cable, and hybrid overhead-cable systems). Featuring an integrated structure with a built-in frequency-converting power module that delivers variable-frequency, voltage-regulated output, it supports frequencies of 47.5 Hz/52.5 Hz, 45.0 Hz/55.0 Hz, 57.5 Hz/62.5 Hz, and 55.0 Hz/65.0 Hz. Utilizing digital filtering technology, it eliminates interference from power-frequency electric fields, fundamentally addressing the challenge of accurate measurement under strong electromagnetic interference conditions. The device is also suitable for testing scenarios where power is supplied by generators following complete power outages.

With the development of power grids and the increasing scarcity of land for transmission line corridors, multi-circuit installation on the same pole has become increasingly common, leading to tighter coupling between transmission lines. This results in significantly stronger interference during power-frequency parameter testing, severely compromising measurement accuracy and the safety of testing equipment. To address this issue, we have developed a new-generation power-frequency parameter testing system for transmission lines, which integrates a variable-frequency test power supply, precision measurement modules, high-speed digital processing chips, and a proprietary national-patented anti-induction voltage circuit. This system effectively eliminates strong interference, ensures equipment safety, and enables highly convenient, rapid, and accurate measurement of power-frequency parameters for transmission lines.

The instrument primarily features the following characteristics:

• Full-touch, large-sized LCD display The instrument features a 7-inch large-touchscreen color display with an ultra-large interactive interface, offering simple operation and highly intuitive steps that require no additional professional training. A single tap completes the entire measurement process, making it an ideal smart measurement device today.
• Small in size and lightweight With its minimal volume and light weight, it provides the simplest and most convenient testing method.
• The power connection is simple and convenient. All measurement processes of the instrument require only connection to the standard 220V mains voltage, effectively addressing the inconvenience associated with using the on-site 380V voltage in conventional measurement methods.
• Extrordinarily strong resistance to induced voltage The instrument features a unique anti-induction voltage circuit, ensuring it can withstand higher induction voltages (with an anti-induction current capacity of up to 60 A) and operate reliably under high induction voltages of 30,000 V.
• Directly measure the induced voltage and induced current. The instrument features a unique anti-induction voltage circuit, ensuring its ability to withstand higher induction voltages. Consequently, it can directly measure both induction voltage and induction current, as well as determine whether the instrument is capable of measuring the specified circuit.
• Frequency conversion technology, precise measurement The instrument features strong anti-interference capability, with its built-in variable-frequency power module providing measurement output power at frequencies of 47.5 Hz/52.5 Hz, 45.0 Hz/55.0 Hz, 57.5 Hz/62.5 Hz, or 55.0 Hz/65.0 Hz. Utilizing digital filtering technology, it effectively suppresses various power-frequency interference signals present in the field, ensuring high-precision, accurate, and reliable measurements.
• High-speed processor Highly accurate and fast: The instrument employs a professional rapid digital signal processor as its core processing unit, significantly enhancing computational performance while ensuring precise measurement data.
• simplicity of operator The external wiring is simple: positive sequence impedance, zero sequence impedance, positive sequence capacitance, and zero sequence capacitance can be measured by connecting only the test lines to the circuit under test. This approach addresses issues associated with conventional testing methods, such as cumbersome wiring reversal, interference susceptibility, stability limitations, and measurement accuracy deficiencies, while preventing potential injuries to operators caused by induced voltages during rewiring.
• Massive Data Storage The instrument is equipped with a calendar chip and high-capacity storage, enabling the sequential preservation of test results by time, allowing easy access to historical records at any time, and supporting print output.
• Scientifically advanced data management Instrument data can be exported via a USB drive, viewed and managed on any PC, and generated into work reports.
• Operation Safety Protection The instrument is specifically designed with a grounding detection function to verify whether it is properly grounded at the field site. In cases of poor or absent grounding, the system will automatically detect this condition and prohibit operation by personnel to ensure personal safety and protect the instrument's functionality.