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ZX-JXPDF: A Technical Overview of Advanced DC System Ground Fault Monitoring
In critical power systems, such as those in substations, power plants, and data centers, the integrity of the DC supply is paramount. A single ground fault in an otherwise floating DC system may not cause an immediate outage, but it creates a significant risk. A second ground fault on the opposite polarity can lead to a short circuit, potentially causing control circuit malfunctions, breaker failure, and extensive equipment damage. The ZX-JXPDF DC Grounding Fault Locating and Alarming Device is a sophisticated solution designed to continuously monitor, locate, and alarm for such faults, ensuring system reliability and safety.
Core Features and Technological Advantages
The ZX-JXPDF is built around a modern, high-performance architecture, offering a comprehensive set of features for DC system management.
1.High-Performance Processing: At its core, the device utilizes an STM32 Cortex-M3 microcontroller. This provides high integration, superior anti-interference capability, fast operational speed, and low power consumption, ensuring reliable and responsive performance in electrically noisy environments.
2.Comprehensive System Monitoring: The device goes beyond simple ground fault detection. Its capabilities include:
Precise Measurement: Accurate monitoring of DC bus voltage, module status, and overall insulation resistance.
Fault Discrimination: It intelligently discriminates between a bus bar grounding fault and a branch circuit grounding fault.
Multi-Branch Fault Location: A key feature is its ability to detect and locate grounding faults in two or more branch circuits simultaneously.
AC Intrusion Detection: Using real-time tracking information zero processing technology, it can detect and alarm for AC signals sneaking into the DC system, with a configurable RMS alarm threshold.
Ripple Analysis: It measures bus ripple voltage and calculates the ripple coefficient, effectively recording AC content in the DC source—a critical indicator of rectifier health.
3.Advanced Fault Locating: The device can perform cyclic testing on all branches or be configured to test a single selected branch. Its "Fast branch testing" feature minimizes diagnosis time. A significant advantage is the lack of consistency or direction requirements for Current Transformer (CT) polarity, simplifying installation and maintenance.
4.Flexible Communication and Integration: Designed for modern automated systems, the ZX-JXPDF is equipped with multiple communication interfaces:
RS485 for Sampling: This technology extends the effective signal transmission distance for remote sensors up to 1000 meters.
System Connectivity: It includes RS232, RS485, and a 100M Ethernet interface for seamless integration with external SCADA, DCS, or other monitoring systems.
Multi-Unit Coordination: A simple multi-machine connection function allows for the monitoring of complex, multi-level DC systems.
5.User Interface and Data Logging: The device features a color LCD with a menu-driven interface for intuitive operation and parameter configuration. It stores and displays the latest five bus insulation warning records, aiding in trend analysis and troubleshooting. Alarms are provided via both sound/light indicators and dry contact outputs.
Key Technical Indicators
The following table summarizes the critical performance specifications of the ZX-JXPDF:
Parameter | Specification |
DC System Voltage | 24Vdc, 48Vdc, 110Vdc, 220Vdc |
Operating Voltage | AC/DC 85-265V |
Bus Voltage Accuracy | ±0.5% |
Bus Insulation Accuracy | 0-5kΩ: ±0.1kΩ; 5-50kΩ: ≤5%; 50-100kΩ: ≤10% |
Branch Insulation Accuracy | 0.5-10kΩ: ≤15%; 10-25kΩ: ≤20% |
AC Intrusion Voltage | Range: 0-300V; Accuracy: ≤1% |
Ripple Measurement | Range: 0-100V; Accuracy: >1% |
Relay Alarm Time | ≤ 2 seconds |
Communication | RS232, RS485, 100M Ethernet |
Power Consumption | ≤ 30W |
Operating Environment | -10℃ to +55℃, Humidity ≤90% |
Conclusion
The ZX-JXPDF DC Grounding Fault Locating and Alarming Device represents a robust and intelligent solution for safeguarding critical DC power systems. Its combination of a powerful Cortex-M3 processor, comprehensive monitoring capabilities—including insulation resistance, AC intrusion, and ripple voltage—and flexible communication options makes it an essential tool for technicians and engineers. By enabling rapid and precise location of ground faults across multiple branches, it significantly reduces maintenance time and enhances overall system reliability, helping to prevent costly downtime and equipment damage.
GDZX is a manufacturer of power detection equipment, offering a diverse range of products with comprehensive models and providing professional technical support. Contact us at +86-27-6552607 or +86-17396104357.Website: http://en.gdzxdl.com/
