Distributed Partial Discharge Testing System For Cables

MOEORW-W5086LFG Distributed Cable High-Frequency Partial Discharge Detection System is a modular live-line PD diagnostic device for power grid operation & maintenance, third-party power engineering testing, cable factory factory acceptance withstand voltage test, and substation online monitoring. It supports uninterrupted distributed long-term online monitoring and portable on-site inspection for 10~1000kV XLPE power cables, serving as a standardized detection solution for cable insulation tree aging, joint defects and sheath damage faults.

1.Power grid operation & maintenance enterprises: Sectional long-term online monitoring of urban cable tunnels, duct cables and ring main unit cables with hundreds of nodes deployed in batches;
2.Third-party power testing institutions: Flexible switching between single-unit and multi-unit series for field inspection, cable handover withstand voltage test and fault fixed-point location;
3.Cable manufacturers: Batch production line matching for partial discharge withstand voltage test of finished cable products before delivery;
4.Industrial & rail transit power distribution: Regular insulation monitoring of factory high-voltage cables and subway cables.

Key Parameters of Partial Discharge Detection Unit
1.Detection Sensitivity: Minimum detectable PD signal of 5pC Principle: Equipped with adjustable digital filter (300kHz~50MHz) and 14bit high-precision AD sampling, matched with openable HFCT high-frequency Rogowski coil sensor. It can fully capture weak discharge signals in early tree aging (precursor of 0.1pC-level deterioration), far exceeding the industrial standard threshold of 10pC, realizing early prediction of hidden insulation hazards;
2.Sampling Performance: 125MS/s high-speed sampling, 14bit sampling resolution, 0.1dB amplitude resolution Advantage: Narrow PD pulses will attenuate and broaden when propagating to measuring points. High sampling rate completely retains time & frequency domain features of pulses, accurately distinguishing PD pulses from on-site power frequency interference and converter noise;
3.Hardware Protection: Withstand 600kV flashover impact without hardware damage or data loss Credibility: Built-in surge absorption and multi-stage isolation filter circuits. No extra protective accessories are required for on-site scenarios with overvoltage impact caused by cable faults, lowering clients' supporting costs;
4.Measuring dynamic range of 70dB, adjustable gain from -30dB to 20dB, 3 independent channels CHA/CHB/CHC Applicability: Full coverage of low-amplitude discharge under light load and high-amplitude discharge before breakdown. Simultaneous three-phase cable collection eliminates repeated phase-by-phase testing and improves detection efficiency;
5.Synchronization Performance: Time base synchronization accuracy ≤2ns, phase accuracy 0.1°, supporting 4 synchronization modes Value: When multi-unit series distributed monitoring is adopted, phase timing of all devices is fully aligned, greatly reducing the error of double-ended traveling wave fault location, meeting the technical bidding requirements of high-precision fault location projects;
6.Communication Transmission: Dual transmission modes of fiber wire and 4G wireless, a single system supports up to 100 detection units networking Bulk Procurement Advantage: Hundreds of monitoring nodes can be deployed in batches for large cable tunnel projects. Devices automatically identify and form network without manual configuration unit by unit, cutting clients' on-site construction man-hours;
7.Environmental Adaptability: Operating temperature -15℃~50℃, relative humidity ≤90% without condensation, suitable for harsh sites including outdoor underground tunnels, high-temperature cable wells and northern outdoor areas in winter;
8.Power Supply: 12.6V rechargeable lithium battery, supporting long-term inspection and monitoring without external mains power.
 

Supporting Sensor Parameters
Openable HFCT high-frequency current sensor with fully metal shielded shell, rainproof and dustproof. It can be clamped and installed without disconnecting cable grounding wires, suitable for batch reconstruction construction of grounding leads with various wire diameters.

Distributed Modular Design, Cost Advantage for Batch Projects
A single system supports up to 100 detection units for capacity expansion. Devices are automatically identified via series fiber networking, no software reconfiguration required when adding or removing nodes. Three layout modes (fiber, 4G, standalone) can be switched freely, and one set of equipment undertakes both online monitoring and field inspection businesses.
Most competing products only support 30~50 units per system, requiring multiple mainframes for large tunnel projects and significantly raising clients' procurement costs. This product supports large-capacity networking for a single system, with lower average cost per node under bulk procurement and more competitive bidding quotations.
 

Edge Computing Local Preprocessing, Reducing Cloud Server Investment
Detection unit built-in FPGA + 32-bit industrial ARM processor completes PD signal filtering, amplitude calculation and pulse screening locally, only uploading abnormal early warning data instead of continuous mass raw sampling waveforms.
Most competing products upload all raw data, requiring clients to deploy high-performance cloud servers to carry traffic and increasing long-term operation costs. Local edge computing cuts over 90% of transmitted data volume, greatly reducing clients' server hardware and traffic fees after batch deployment.
 

Multi-dimensional Anti-interference Algorithm, Adaptable to Complex Industrial Sites
Multi-stage hardware filtering + software time & frequency domain joint interference separation algorithm distinguishes converter interference, mobile base station radiation, high-voltage equipment corona interference and real cable partial discharge; built-in filter module with adjustable passband of 300kHz~500kHz.
Urban cable tunnels are surrounded by massive electromagnetic interference. Low-cost equipment is prone to false alarms, leading to repeated re-testing and rising labor costs for clients. This device passes EMC tests in authoritative power laboratories with a false alarm rate lower than 1% under complex working conditions, cutting clients' after-sales rework costs.
 

All-in-one Full-function Software, No Extra Paid Modules (Value-added Advantage for Bulk Clients)
Supporting management software opens all functions for free, including PRPD/PRPS/phase linear/ellipse/flying spectrum, pulse time & frequency domain analysis, double-ended fault location, automatic report export and hierarchical early warning, with no function unlocking by staged payment.
Spectrum analysis and fault location functions of similar products in the market are mostly optional paid modules, requiring clients to pay extra annual software fees after bulk procurement. Full functions of this product's software are upgraded for free lifelong, improving clients' market competitiveness.
 

Dual-purpose Equipment: Long-term Online Monitoring + Portable Field Inspection
Detection unit built-in rechargeable battery. Fiber networking is adopted for long-term online monitoring in tunnels, while the unit can be detached and matched with laptops under standalone mode for field inspection and cable handover tests. No separate procurement of two sets of equipment (online monitor and portable PD tester) is needed.
Clients cover two types of businesses with a single model during bulk stocking, reducing the number of inventory SKUs and capital occupation, supporting flexible delivery for small orders and large projects alike.