Broadband Impedance Cable Defect Locator

Broadband Impedance Cable Defect Locator

The MOEORW-WRK800 is a compact, portable diagnostic instrument designed for non-destructive defect detection and precise positioning on power cables. It adopts broadband frequency measurement technology and time-frequency conversion algorithms to analyze wave impedance distribution along cable lines. The equipment performs rapid testing under complex electromagnetic conditions in both laboratory and field environments, effectively identifying various cable defects and reducing power outage duration.This device injects high-frequency sinusoidal AC signals into the cable and captures reflected voltage signals generated at non-uniform medium positions. By processing frequency-reflected voltage amplitude data, it obtains wave impedance characteristics of each cable section. Equipped with C-language based testing software and intelligent positioning assistance functions, it simplifies parameter configuration, accelerates diagnosis and clearly indicates the location and severity of cable anomalies. Three display modes are integrated to comprehensively characterize fault features for comprehensive cable status evaluation.

The instrument transmits sinusoidal voltage signals within a wide frequency range to the tested cable, then measures the amplitude and phase of reflected voltage to calculate the amplitude and phase of reflection coefficient and wave impedance. Fourier transform is applied to convert frequency-domain wave impedance data into time-amplitude curves. Combined with preset wave velocity parameters, time-amplitude data is further converted into distance-amplitude curves. Technicians can judge the type and severity of cable defects according to variations of reflection characteristics at different positions along the cable.

Three models (Standard, Advanced, Professional) are available with differentiated parameters as listed below:

Note: The specified frequency range is the effective band for 1km cable measurement; Dynamic range refers to the ratio between the minimum detectable signal and output voltage.

1. Hardware & Technical Design

√ Adopts non-invasive low-voltage testing technology to realize fully non-destructive detection without damaging tested cables.u Equipped with ultra-wide frequency band and low-attenuation circuit design, supporting multi-band signal transmission and collection.u Built-in high-speed data acquisition module and professional time-frequency conversion algorithm, developed based on C language for stable and efficient operation.u Integrated intelligent positioning assistant algorithm set, including defect identification, positioning error correction and adaptive frequency band matching modules.

2. Performance Indicators

√ The professional version achieves a maximum dynamic range of 140 dB, delivering outstanding detection sensitivity for minor defects.u Two optional test modes: rapid mode completes one-phase test within 20 seconds, and precision mode finishes one-phase test in 2 minutes.u High-density sweep points and high sampling rate ensure high-resolution data collection and accurate positioning results.u Multiple visual display modes including step response, pulse response and pulse amplitude to present cable impedance characteristics from multiple dimensions.

3. Practical Application Value

√ Supports positioning of typical cable faults such as water immersion, high-resistance fault, mechanical damage, local aging, open circuit and short circuit.u Compatible with low-voltage distribution cables, power transmission cables, low-voltage DC cables and various special cables to meet diverse on-site test demands.u Intuitive software interface and simplified parameter settings lower operation difficulty; comparative analysis function supports data comparison with historical or benchmark curves.u Capable of identifying early potential defects, facilitating regular cable health monitoring and targeted aging equipment replacement.

Cable body defects: Local aging, electrical treeing, water treeingTerminal & joint defects: Water immersion, aging, manufacturing process defectsOuter sheath defects: Sheath fracture, low-resistance short circuit, insulation weak points

Application Fields

1) Cable Fault Diagnosis & Positioning: Locate existing faults and abnormal points of power cables quickly on site.

2) Cable Health Monitoring: Regularly inspect cable operating status and discover latent defects in advance to prevent sudden failures.

3) Cable Service Life Evaluation: Assess overall aging degree of cable lines, provide data support for equipment renewal and extend the service life of in-service cables.

Standard Accessories

Main unit of MOEORW-WRK800 cable broadband impedance defect locator × 1Test connecting wires × 1 setGrounding strap × 1 setOperation manual × 1 copy