Distributed High-Frequency Partial Discharge Detection System For Cables

MOEORW-W5086LFD Online distributed monitoring of XLPE power cables, handover withstand voltage tests of cables, portable field inspection of cable routes, 24/7 online early warning for cable tunnels. Covers partial discharge detection on 10kV/35kV/110kV cable bodies, intermediate joints and cable terminations.

• Traditional single PD detectors only support single-point measurement; multi-node monitoring over long-distance cables requires multiple devices without synchronous data comparison, making fault location extremely difficult.
• Severe electromagnetic interference on-site leads to high false alarm rates for ordinary PD equipment, raising labor costs for repeated on-site verification.
• Cables operated over 25 years suffer severe insulation tree aging. Conventional instruments fail to fully quantify PD ranging from 0.1pC (initial tree growth) to 1000pC (pre-breakdown critical state).
• Wired wiring is labor-intensive; wireless monitoring is unavailable for cable wells/tunnels without Ethernet access.
• Mass-deployed third-party devices lack synchronous timing and unified data platforms, increasing centralized management difficulty.

Distributed multi-node synchronous HFCT PD online monitoring system, supporting 3 deployment modes (optical fiber / 4G wireless / standalone). Up to 100 monitoring units work synchronously, enabling live-line non-power-off testing and full-section insulation defect early warning for power cables.

1.Large-Scale Distributed Networking, Low Cost for Bulk Deployment (No.1 Concern for Engineering Wholesalers)
A single system supports up to 100 synchronized PD detection units, plug-and-play. Adding or removing terminals requires no extra background configuration with automatic device identification. 3 flexible topology options: daisy-chained optical fiber, independent 4G cloud networking, standalone portable mode.

Product Parameter :
1.Time base synchronization error ≤ 2ns for optical fiber links;
2.Phase synchronization accuracy 0.1° for 100 connected units;
3.Single optical fiber chain supports up to 20 detection units;
4.4G modules operate independently without signal mutual interference;
5.Automatic node ID allocation, no manual IP configuration required.

Built-in optical fiber time base synchronous bus + 32-bit industrial ARM processor, self-developed underlying communication protocol with automatic node ID allocation. No manual IP configuration for on-site mass installation.

Ideal for large-scale projects such as urban cable tunnels and municipal cable networks. Mass delivery cuts on-site commissioning labor costs drastically. Clients can place supplementary orders for later project expansion without full system reconfiguration.

2.Ultra-High Detection Sensitivity & Wide Hardware Bandwidth for Accurate Measurement
Feature: Minimum detectable partial discharge signal: 5pC; detection frequency band 300kHz ~ 30MHz, perfectly matching HFCT high-frequency pulse current signals from cable grounding down-leads.

Product Parameter :
1.Transfer impedance ≥10mV/mA;
2.Measurement dynamic range 70dB;
3.Adjustable gain range: -30dB ~ 20dB, resolution 0.1dB;
4.Sampling frequency: 125MS/s;
5.Sampling precision: 14-bit high-precision AD;
6.Withstands 600kV flashover impulse without hardware damage or data loss;
7.Input impedance of signal channel: 50Ω.

Working Principle
Split-core HFCT sensors adopt high-permeability magnetic cores and full metal shielding enclosures to suppress external electromagnetic noise.
Dual-stage hardware filtering + 14-bit high-precision AD converter + 125MS/s high-speed sampling on detection units, paired with FPGA digital noise reduction algorithm to separate industrial frequency converter, motor and communication interference signals.
Captures faint 0.1pC-level discharge in early tree aging and severe pre-breakdown discharge up to 1000pC. Test reports comply with power industry handover test standards with legally valid measured data.

3.Triple Communication Modes for Full-Scenario Compatibility

• Optical Fiber Networking Mode: Separate optical fiber links for synchronous timing and data transmission, stable low-latency data transmission for tunnels and substations without external network access. Matched with synchronization unit for global phase synchronization specially designed for withstand voltage tests. Supporting complete parameters: Fixed PC network segment 192.168.80.x; single-mode optical fiber single-section transmission distance up to 10km.
• 4G Wireless Cloud Mode: Built-in 4G communication module for cable wells and remote sites without fiber access; data uploads directly to cloud platform for remote PC/mobile monitoring; customizable cloud server IP address. Supporting complete parameters: Support TCP/IP cloud transmission, data upload interval adjustable from 1s~300s.
• Standalone Portable Mode: Single unit paired with laptop for on-site inspection and emergency troubleshooting. Built-in 12.6V rechargeable lithium battery supports full-day field operation. Supporting complete parameters: Standalone fixed network segment 192.168.50.x, battery full-load continuous working time ≥8h.

Physical dial switch on front panel for mode switching (pure hardware control without software compatibility bugs). Uniform data acquisition algorithm across all three modes for consistent measurement standards.
Distributors cover three business segments (tunnel online monitoring, portable inspection, withstand voltage testing) with one single product model, reducing inventory pressure and expanding business scope without stocking multiple testing devices.

4.Multi-Mode Synchronization for Precise Cable Fault Location
Full Coverage Synchronization Schemes: Internal virtual phase synchronization per unit, global optical fiber system synchronization, external high-voltage test voltage synchronization (AC 20~250V input). Additional Rogowski coil current synchronization available.
Product Parameter :
1.Synchronization frequency range: 20~300Hz, compatible with 50Hz domestic power frequency grid;
2.Phase synchronization accuracy: 0.1°;
3.External synchronous input voltage range: AC20V~250V;
4.Synchronization unit input impedance: 10MΩ;
5.Time base synchronization error ≤ 2ns.
During cable withstand voltage handover tests, the system connects to the low-voltage side signal of test transformers to distinguish PD pulses against voltage phases. The software automatically calculates similarity ratios of internal discharge, surface discharge and corona interference.

5.Edge Computing & Intelligent Anti-Interference, Reduces Backend O&M Cost
Feature: On-site FPGA edge computing performs local signal filtering, noise reduction and peak value statistics. Only valid characteristic data is uploaded to avoid massive raw data congestion on communication links; dual time-domain & frequency-domain interference separation algorithm embedded.

Product Parameter :
1.On-board FPGA real-time parallel computing chip;
2.Local storage capacity: 8G industrial storage;
3.Real-time statistical cycle: adjustable 100/500/1000/2000 cycles;
4.False alarm reduction rate ≥80% after intelligent filtering.
Working Principle: Raw waveform local storage on hardware; only cycle peak values and discharge counts transmitted to servers to cut 4G data traffic and optical fiber bandwidth consumption. Adjustable hardware high/low-pass filters + AI pattern recognition software separate real PD signals from industrial noise.
Cloud servers do not require high-end configuration even with 100+ online units, slashing post-project server investment. False alarm rates drop by over 80% to eliminate unnecessary on-site inspection labor.

6.Full-Range Intelligent Early Warning & Professional Supporting Analysis Software
Software Functions: Real-time trend curve, 2D PRPD pattern, 3D PRPS pattern, single pulse time/frequency domain analysis, AI discharge type identification, automatic report export, historical data storage & playback. Customizable threshold settings for Attention Level, Alarm Level and Count Threshold.

Product Parameter :
1.Threshold adjustable range: 0~70dBmV;
2.Count threshold adjustable range: 1~999 times;
3.Automatic discharge similarity calculation (0~100%);
4.Historical data storage cycle ≥3 years;
5.Support screenshot & PNG batch export of all patterns.

7. Industrial-Grade Durable Hardware for Long-Term Outdoor Continuous Operation
Product Parameter :
1.Operating temperature: -15℃ ~ 50℃;
2.Relative humidity: ≤90% non-condensing;
3.Power supply: DC12.6V rechargeable lithium battery;
4.Detection unit dimension: 25815287 mm, net weight 1.5kg;
5.Synchronization unit dimension: 33031098 mm, net weight 2.5kg;
6.Impulse resistance: Withstands 600kV flashover impulse without damage & data loss.
Power & Protection: Aluminum alloy shielding housing, built-in 12.6V rechargeable lithium battery for power outage backup, snap-on waterproof connectors for all ports.
Impulse Resistance: Withstands 600kV flashover impulse; equipment remains intact and data retained after lightning or overvoltage surges.
Dimension & Weight: Detection unit: 25815287 mm, net weight 1.5kg; synchronization unit: 33031098 mm, net weight 2.5kg, lightweight for easy transportation and installation.

• Standalone Inspection Package: 1× PD detection unit + 1~3× split-core HFCT sensors + SMA signal cables + charging adapter + analysis software installation kit HFCT sensor standard inner diameter optional: 50mm/80mm/120mm;
• Optical Fiber Distributed Networking Package: Multiple PD detection units + signal synchronization central unit + single-mode synchronous optical fiber + communication optical fiber Optical fiber standard specification: single-mode 9/125μm, SC connector;
• 4G Online Monitoring Package: 4G-enabled PD detection unit + HFCT sensors + 4G antenna + complimentary cloud platform account for bulk orders 4G antenna gain: 3dBi omnidirectional antenna;