High & Low Voltage Cable Fault Detector

The MOEORW-WLG900 Intelligent Cable Fault Locator is a next-generation intelligent test instrument designed for power cable operation and maintenance. It integrates low-voltage pulse ranging, impulse high-voltage flashover ranging, and intelligent waveform analysis. Featuring an industrial-grade Linux system and high-speed data acquirer with a sampling frequency of 80MHz and a ranging range of >40km, the system error can be controlled within ≤10cm when used with a dedicated pinpointing instrument.

This Power Cable Tester can quickly locate low-resistance, short-circuit, open-circuit, high-resistance leakage, and high-resistance flashover faults in power cables of various voltage levels, communication coaxial cables, telephone cables, control cables, mining cables, and submarine cables. It is an indispensable testing tool for power plants, substations, power transmission and distribution projects, and electrical maintenance departments of large industrial and mining enterprises. Whether it is emergency repair of cable open/short circuit faults or routine cable inspection of long-distance submarine cables, this device provides reliable data support.

The following scenarios cover the entire chain of the power system, including various actual working conditions for end users and engineering service providers:

• Fault diagnosis of outgoing cables in substations and power plants: Quickly locate fault sections between switchgear and terminal poles, reducing outage inspection time.
• Emergency repair of urban distribution underground cables: With high-voltage signal generator, precisely locate high-resistance fault points of underground cables without pavement damage, avoiding large-scale excavation.
• Preventive maintenance of power cables in factories and mines: Regularly inspect mining rubber-sheathed cables that frequently move in steel rolling, coal, chemical and other industries, identifying insulation deterioration risks in advance.
• Inspection of long-distance submarine and river-crossing cables: Calibrate wave speed and locate breakpoints for ultra-long cables exceeding 20km, solving waveform attenuation challenges in long-distance testing.
• Fault diagnosis of DC traction cables in rail transit: Suitable for rapid troubleshooting of short-circuit and grounding faults in 1500V and below DC cables in subway and light rail systems.
• Feeder cable testing for communication base stations and radar stations: Use this Cable Time-Domain Reflectometer to precisely determine breakpoint positions of RF coaxial cables in communication rooms, ensuring signal transmission link integrity.
• Quality sampling inspection of finished products in cable manufacturing plants: Verify full length and wave speed consistency of finished cables on the production line, ensuring each shipping cable meets electrical length specifications.
• Cable construction acceptance and handover testing for engineering contractors: Conduct end-to-end continuity checks on newly built cable lines before commissioning, issuing acceptance reports with waveform records.

Intelligent Automatic Interpretation, Significantly Lowering Experience RequirementsThe instrument features a built-in fully automatic waveform analysis algorithm. In most test scenarios, it automatically positions electronic cursors at fault characteristic inflection points and directly displays the fault distance, enabling one-click reading of cable ranging results without manual repeated adjustments. For the rare special waveforms that are difficult to interpret automatically, the device supports mobile hotspot data transmission, allowing field personnel to send waveform data to the manufacturer's technical center for remote consultation, effectively solving misjudgment issues caused by insufficient on-site experience.

• Nanosecond-level Sampling and Ultra-high Ranging ResolutionAs a high-precision High and Low Voltage Cable Fault Detector, it features a maximum sampling frequency of 80MHz and ranging resolution of 0.5m. For short-distance tests under 1km, the absolute measurement error does not exceed 0.5m; for distances greater than 1km, the relative error is ≤0.5%. This precision stems from the synergistic operation of industrial-grade high-speed A/D converters and low-noise preamplifier circuits, ensuring weak reflected signals can still be effectively captured after long-distance transmission. The data has been verified by China Electric Power Research Institute type testing.
• Full-scenario Fault Type Coverage – One Machine for Low to High ResistanceOne host simultaneously supports Low-Voltage Pulse Method (for low-resistance, short-circuit, open-circuit and full-length testing) and Impulse High-Voltage Flashover Method (for high-resistance leakage and flashover faults), without the need for module replacement – a true Comprehensive Cable Diagnostic Device. The device comes with 5 preset cable wave speeds (oil-impregnated paper 160, cross-linked polyethylene 172, PVC 184, mining rubber-sheathed 125, unit m/μs), and also supports on-site measurement and calibration of unknown cable wave speeds, solving the practical pain point that many old and imported cables cannot be measured due to unknown parameters.
• Absolute Safety in High-voltage Fields, Strong Anti-interference Ensuring Test ContinuityCurrent transformer sampling technology is adopted, achieving physical isolation between the host and the impulse high-voltage circuit. During Impulse Flash Method Cable Testing, the instrument does not freeze or restart even under 35KV high-voltage impulse environment, with stable and distinguishable waveforms. During high-voltage flashover testing, the host only couples signals through a non-contact current sampling box, completely eliminating the possibility of high voltage entering the instrument core. This design has passed GB/T 6587 safety and electromagnetic compatibility testing for electronic measuring instruments.
• Large-capacity Data Storage and Convenient Waveform ReviewThe instrument can store thousands of historical test waveforms and supports on-screen overlay comparison, facilitating comparison of test results from different periods on site. Stored files contain complete parameter watermarks including test date, cable type, wave speed, sampling frequency, etc., serving as important electronic evidence for fault analysis and meeting power industry equipment record management requirements.
• Long Battery Life and Wide Operating Temperature RangeBuilt-in 12V/5200mAh high-energy polymer battery provides continuous operation of ≥8 hours, with operating temperature range of -12℃ to 50℃. The battery has undergone over 200 charge-discharge cycle tests with capacity degradation below 15%, suitable for all-weather emergency repair operations in field environments without mains power.