Transformer Partial Discharge Online Monitoring Device

Adopting the pulse current detection method specified by power grid standards, this product realizes 24/7 uninterrupted insulation condition online monitoring for 10kV–38kV oil-immersed power transformers. It captures latent partial discharge defects inside transformers including air bubbles, insulation aging, oil impurities and suspended particles without power cut, replacing traditional annual power-off partial discharge tests and greatly cutting power station operation & maintenance outage costs.

The whole system adopts a 3-layer distributed architecture consisting of IPDS coupling capacitance sensors, local acquisition units and WEB cloud diagnosis platform. All components are self-produced and supplied as a complete package, suitable for bulk engineering projects such as newly-built substations, intelligent renovation of old substations, power plant main transformers and park self-owned transformers. One single background platform supports up to 200 monitoring units for synchronous monitoring of multiple transformers, making it the mainstream equipment for bulk procurement by power engineering contractors, complete set manufacturers and power grid operation & maintenance enterprises.

Compliant Standards: GB/T 7354-2018 Partial Discharge Measurement, DL/T 417-2019 On-site Measurement Guide for Partial Discharge of Power Equipment, Q/GDW 535-2010 General Specification for Substation Online Monitoring Devices.

There are hundreds of pF distributed capacitances between transformer windings, iron cores and fuel tanks. When partial discharge occurs inside the transformer, high-frequency discharge signals ranging from tens of kHz to tens of MHz will conduct outward through the iron core grounding loop. We install FIPD-1000 pulse current sensors on the transformer iron core grounding wire to couple high-frequency partial discharge pulse signals, which are transmitted to the local acquisition unit via coaxial cables.

The acquisition unit completes hardware filtering, signal amplification and 14-bit high-precision AD analog-to-digital conversion, and adopts FPGA parallel computing for high-order digital noise reduction. After local edge computing, data is uploaded to the WEB background via optical fiber / network cable / 4G. All devices share unified time base synchronization with time difference less than 100ns, so waveform and atlas comparison of multiple transformers has no phase offset. It accurately distinguishes real partial discharge from external electromagnetic interference such as substation switches, inverters and lightning strokes to avoid false alarms.

Local Partial Discharge Acquisition Unit MOEORW-5085B
1.Sampling Performance: 100MS/s sampling rate, 14-bit resolution, 4-channel synchronous acquisition, synchronous time difference of all network devices ＜100ns
2.Detection Sensitivity: Minimum detectable discharge signal as low as 5PC, far better than the industry common 10PC threshold, doubling the detection rate of early insulation defects
3.Transmission Modes: Triple-mode transmission via optical fiber / Ethernet / 4G; maximum transmission distance of 20km between optical fiber nodes, no signal attenuation for long-distance wiring in large substations and mountain sites
4.Impact & Anti-interference Protection: Withstands 600kV instantaneous flashover impact; devices remain intact and cached data won't be lost under lightning strike or high-voltage short-circuit impact. Dual-layer time-domain & frequency-domain filtering ensures false alarm rate ＜3% under strong electromagnetic environment
5.Environmental Adaptability: Operating temperature -25℃ ~ 50℃, relative humidity ≤90%; universal station power supply AC100V~240V, total power consumption only 20W
6.On-site Operation & Maintenance: Built-in local LCD screen for real-time partial discharge data checking on site; reserved multi-standard interfaces including USB, RS485, Ethernet and optical fiber for direct debugging with inspection laptops
7.Expansion Capacity: TCP/IP distributed IP architecture, newly added devices are automatically identified without complex background configuration; single platform supports up to 200 online acquisition units
 

IPDS Coupling Capacitance Pulse Current Sensor
1.Detection Frequency Band: 0.3MHz ~ 30MHz, fully covering the high-frequency signal range of transformer partial discharge
2.Performance Indicators: Dynamic range 68dB, resolution 0.1dB, transfer impedance ≥10mV/mA, standard input impedance 50Ω
3.Application Scope: Applicable to medium & high voltage transformers up to 38kV; standard grounding design for base, unified RF coaxial interface, fully interchangeable sensors of the same model. Bulk buyers can share spare parts to cut inventory capital occupation
4.Built-in protection circuit and phase reference module; installation requires no modification to transformer body, live installation won't affect normal equipment operation

The software adopts micro-service WEB architecture, no local client installation required. Accessible via browser on computers, cloud terminals and mobile phones, supporting remote viewing through external cloud platforms and unified cluster management of multiple sites.
1.Full-dimensional Data Visualization Atlases (Compliant with Power Grid Standards) Built-in full set of industry standard analysis charts: 30-day partial discharge trend line chart, PRPD 2D phase atlas, PRPS 3D feature atlas, phase linear atlas. Single-channel waveform details can be zoomed in; the system automatically matches expert defect atlas library to judge fault types including bubble discharge, oil impurities and insulation tree aging, lowering professional threshold for maintenance staff.
2.10-year Mass Data Storage Equipped with SQL Server enterprise database, native support for 10-year complete local storage of monitoring data, complying with power industry data archiving specifications for equipment status. No extra storage server procurement required for bulk projects to reduce supporting investment.
3.Multi-level Early Warning & Automatic Report Generation Customizable two-level thresholds (alarm threshold / attention threshold) for real-time pop-up alarms and permanent log records. Automatic daily/monthly/annual monitoring reports can be exported and printed, directly meeting power grid inspection ledger requirements and reducing manual statistical workload.
4.Fully Open Standard Power Protocols (Must-have for Complete Set Integration) Natively compatible with IEC61850, State Grid / China Southern Power Grid protocols, MQTT, RESTFul, TCP-Modbus, RS485-Modbus. Seamlessly dock with substation integrated automation background and smart power cloud platforms with zero compatibility barriers for complete set projects.
5.Full-site Information Configuration & Management Support hierarchical alias editing for sites, acquisition units and sensors; batch modification of acquisition frequency and threshold parameters; one-click filtering of historical sampling data and alarm records, with functions of batch data backup & clearing to greatly improve multi-site management efficiency.

1. Complete set matching for newly-built 10kV/35kV power grid substations
2. Intelligent renovation of old substations & online monitoring upgrade for stock transformers
3. Main transformer condition monitoring projects for thermal / photovoltaic / wind power plants
4. Self-owned transformer operation & maintenance for chemical, metallurgical and data center parks
5. Portable offline partial discharge testing business for power inspection companies
6. OEM private label supply for electrical complete set manufacturers & system integrators (custom screen printing )