EN
GDDJ-MOA Intelligent Online Monitoring System for Metal Oxide Surge Arresters
The GDDJ-MOA intelligent online monitoring system is dedicated to real-time condition monitoring of metal oxide surge arresters in substations. It continuously measures leakage current, resistive current and lightning surge counts to track arrester insulation aging without power outage.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GDDJ-MOA Surge Arrester Online Monitoring Device is a compact, intelligent system designed for real-time, non-intrusive health monitoring of metal oxide surge arresters (MOA) in 10kV–500kV substations. It accurately measures total leakage current, resistive current, and 3rd–7th harmonic currents to assess aging, moisture ingress, or degradation—without power outage or disassembly.
Featuring a high-precision zero-flux CT, advanced DSP, and synchronous sampling technology, it delivers stable, interference-resistant measurements. The rugged, fully sealed IP67 enclosure withstands harsh outdoor conditions. With RS485/CAN communication and self-diagnosis, it seamlessly integrates into SCADA or IoT platforms for remote monitoring and early warning.
Specifications
| Parameter Category | Specification |
| Measured Parameters | |
| Total Leakage Current | 100μA–50mA, ±(0.5% reading +5μA) |
| Resistive Current | 10μA–10mA, ±(1% reading +5μA) |
| Harmonic Currents | 3rd–7th, 0.01mA resolution |
| Discharge Count | 0–9999, auto-recording |
| CT & Sampling | |
| Sensor Type | High-precision zero-flux CT |
| Sampling Rate | 10kHz synchronous sampling |
| Communication | |
| Wired Interfaces | RS485 (Modbus-RTU), CAN |
| Wireless (Optional) | 4G, Wi-Fi, LoRa |
| Protocol Support | IEC 61850, DL/T 634.5104 |
| Display & Storage | |
| Screen | OLED/LCD, real-time data & alarm |
| Data Storage | 10,000+ records, non-volatile memory |
| Environmental | |
| Operating Temp | -25℃ ~ +40℃ (optional -40℃ ~ +40℃) |
| Humidity | ≤95% RH (non-condensing) |
| Protection Grade | IP67 (dustproof/waterproof) |
| Mechanical | |
| Dimensions | 180×120×60mm |
| Weight | ~1.5kg |
| Compliance | IEC 60099-4, GB 11032, DL/T 1498.3, CE |
Applications
Core Monitoring Objects
· ZnO Surge Arresters (MOA): 10kV–500kV, A-class & B-class arresters
· Substation Equipment: Transformers, GIS, circuit breakers, and busbar arresters
· Distribution Networks: 10kV/35kV switchgear and pole-mounted arresters
· Renewable Plants: Wind farms, solar stations, and collector line arresters
Industry-Specific Usage
· Power Utilities: Substation arrester condition monitoring, aging tracking, fault early warning
· Grid Operators: Online assessment, maintenance scheduling, and asset management
· Industrial Plants: Critical load protection, overvoltage monitoring, and safety compliance
· Renewable Energy: Wind/solar farm arrester health and lightning surge monitoring
Advantages
No Power Outage, No Disassembly
Clamp-on CT enables live installation and monitoring; saves 90% deployment time vs. traditional methods.
Accurate Aging & Moisture Detection
Precise resistive current measurement identifies early degradation—prevents catastrophic failure and outage.
All-Weather Outdoor Reliability
IP67, wide temperature, and EMI resistance ensure 24/7 stable operation in harsh substation environments.
Seamless Grid Integration
Standard protocols (RS485/CAN/IEC 61850) enable plug-and-play connection to SCADA/IoT platforms.
Low Maintenance & Long Life
Self-diagnosis, data logging, and industrial-grade design deliver 10+ years of maintenance-free operation.
FAQ
Q: Can it be installed without power outage?
A: Yes. Clamp-on CT allows live-line installation on grounding leads—no disconnection required.
Q: What’s the key indicator for arrester aging?
A: Resistive current increase (especially 3rd harmonic) is the primary sign of aging or moisture ingress.
Q: Does it work for all voltage levels?
A: Yes. Suitable for 10kV–500kV ZnO arresters (A-class & B-class).
Q: How is data transmitted to the control room?
A: Via RS485/CAN (wired) or 4G/Wi-Fi (wireless) to SCADA/IoT platform.
Q: What’s included in the standard package?
A: Main unit, clamp-on CT, RS485 cable, power adapter, mounting bracket, user manual, and waterproof enclosure.
