Wuhan GDZX Power Equipment Co., Ltd sales@gdzxdl.com 86--17362949750
In power systems, cables are like the "blood vessels" of a city; their insulation health directly affects the reliability and security of the power grid. Traditional cable insulation assessment mainly relies on two core tests: cable withstand voltage testing and oscillating wave partial discharge testing. The former is a destructive strength verification designed to assess the cable's ability to withstand overvoltage; the latter is a non-destructive diagnostic method used to accurately detect early defects within the insulation. Previously, these two types of tests often required different equipment and were performed separately at different times, resulting in cumbersome processes and limited efficiency. However, with advancements in technological integration and operation and maintenance concepts, integrated testing equipment has emerged, leading cable condition-based maintenance into a new stage of high efficiency and precision. Integrated solutions, represented by the ZX-OWTS35 cable AC withstand voltage and oscillating wave partial discharge testing system, have become powerful tools for modern lean cable management due to their three major advantages.
In the traditional model, performing AC withstand voltage testing and oscillating wave partial discharge testing requires two independent systems, resulting in complex on-site wiring and high equipment transportation and management costs. The ZX-OWTS35 system innovatively integrates three major functions: AC series resonant withstand voltage testing, damped oscillating partial discharge testing, and dielectric loss measurement under power frequency excitation. A single device can meet the critical testing needs of cables throughout their entire lifecycle, from acceptance testing (mandatory strength assessment) to preventative diagnostics (condition assessment). This "one machine, three uses" design not only reduces equipment investment and storage space but also enables rapid function switching during on-site testing, significantly shortening downtime for testing and improving the overall efficiency and flexibility of maintenance work.
This system transcends the simple "pass/fail" binary judgment of traditional withstand voltage testing, deeply integrating intelligent diagnostic capabilities. Compliant with the IEC 60270 standard, it can accurately measure partial discharge (5pC~100nC) and pinpoint the exact location of the discharge point with a positioning accuracy of up to 1%. The built-in expert system software can simultaneously display multi-dimensional parameters such as partial discharge waveforms, discharge spectra, and test voltages. Through algorithms, it effectively suppresses on-site interference and automatically saves data, generating diagnostic reports containing information on "discharge magnitude, defect location, and possible type." This provides maintenance personnel with in-depth insights comparable to a "cable CT scan," enabling a shift from "reactive maintenance" to "predictive maintenance," making maintenance decisions more scientific and objectives clearer.
Considering that cable testing often involves various complex on-site environments such as the field, tunnels, and substations, the system's modular, modular structure demonstrates excellent adaptability. All core components, such as frequency converters, excitation transformers, and reactors, adopt independent modular designs, resulting in compact size and relatively light weight. Users can flexibly combine the required equipment modules according to different cable lengths (supporting up to 5km) and voltage levels (up to 35kV). This design significantly improves equipment transportation and on-site handling conditions, reduces labor intensity, and ensures rapid deployment and reliable testing even in harsh field conditions, truly achieving a perfect combination of laboratory-level precision and field practicality.
In summary, the intelligent integration of AC withstand voltage "strength verification" and oscillating wave partial discharge "early diagnosis" functions represents the development direction of cable testing technology. The ZX-OWTS35 system's three core advantages—high integration, intelligent diagnostics, and superior portability—not only respond to the urgent needs of modern power asset condition-based maintenance but also perfectly align with the advanced operation and maintenance strategy of "prioritizing oscillating wave condition diagnosis, and then combining or performing withstand voltage verification when necessary." Through a single test and multi-dimensional evaluation, it constructs a more complete, efficient, and economical assessment system for cable insulation health, providing crucial technical support for ensuring the safe, stable, and long-term operation of the power grid.
