Transformer Core Grounding Current Monitor
Transformer Core Grounding Current Monitor is designed for real-time detection of leakage currents in the grounding leads of transformer cores or clamping components, preventing faults such as circulating overcurrents, insulation degradation, and even equipment burnout caused by multi-point grounding. Based on high-precision zero-flux or core-through current sensors, it non-intrusively collects microampere to ampere-level current signals. Through intelligent algorithm analysis, it enables early warning of abnormal conditions. Its core functions include ensuring safe transformer operation, extending equipment lifespan, replacing manual inspections, supporting condition-based maintenance, and complying with relevant power industry standards.
Description
Details page content
I. Product Introduction:
The SUN-IGuard-201 Transformer Core Grounding Current Monitor primarily consists of a high-sensitivity current sensor, a data acquisition and processing unit, a communication module (supporting RS485, 4G, IEC61850, etc.), a local display and alarm device (optional), and supervisory software. It features strong anti-interference capabilities and long-term stability, making it suitable for substations at 110kV and above. It serves as a key technical equipment for building smart grids and achieving predictive maintenance of transformers.
II. Model Explanation
III.Product Details/Advantages:
1.High-precision wide-range measurement: Uses highly sensitive zero-flux or through-core sensors to accurately measure μA to A-level grounding current, enabling early fault detection.
2.Strong anti-interference capability: Optimized for complex substation EMC environments with robust shielding, ensuring stable and reliable data.
3.Real-time monitoring & intelligent alerting: 24/7 continuous monitoring with multi-level thresholds and trend analysis for early fault warning.
4.Flexible communication & integration: Supports RS485, CAN, 4G/5G, IEC61850 for easy integration with substation automation systems or cloud platforms.
5.High reliability & maintenance-free design: Passive sensing, non-contact installation, ruggedized for harsh conditions (extreme temperatures, high humidity), with long-term calibration-free operation and low maintenance.
IV. Testing Indicators
|
No |
Parameter Name |
Unit |
Standard parameter values |
|
|
1 |
sensor type |
through-core type |
||
|
2 |
Transformer Core Grounding Current Monitor |
measurement range |
mA |
0.1～10000 |
|
resolution |
mA |
0.1 |
||
|
measurement error |
± (standard reading * 2.5%+1mA) |
|||
|
3 |
On site display content of the device |
Real time grounding current value |
||
|
Alarm Alert |
||||
|
4 |
Device non-volatile storage |
storage capacity |
Day |
≥30 |
|
5 |
communication interface |
Per-unit single-phase monitoring, supporting State Grid's I1/I2 interface specifications for system access. |
||
|
6 |
Device parameter settings |
Communication parameters |
Communication address, baud rate, data bit, stop bit, verification method |
|
|
alarm parameters |
Grounding current alarm threshold |
|||
|
operating parameters |
Sampling period, local clock |
|||
|
7 |
Sampling period range of the device |
min |
≥1 |
|
|
8 |
Clock accuracy of the device |
min |
≤1 |
|
|
9 |
service life |
Year |
Over 8 years |
|
|
10 |
Electromagnetic Compatibility |
Shall comply with the EMC test requirements of Q/GDW535-2021. |
||
V. Scope of Supply
- SUN-IGuard-201 Transformer Core Grounding Current Monitor: 1 unit;
- SUN-IGuard-201 Software of Transformer Core Grounding Current Monitor: 1 set;
- PK screen: 1 (optional);
- Communication cable: 1 set;
VI. Optional Customization Solutions
We offer customizable devices with monitoring and switchable resistor functions. When readings reach the alarm threshold, the resistor can be manually engaged to limit grounding current, allowing flexible scheduling of power shutdowns for maintenance.
VII. Quality
Site conforms to GB/T 9361 Class B, monitoring device conforms to GB 4943.
Qualification association: We adhere strictly to globally recognized regulations and protocols, integrating environmental excellence and quality management throughout the product lifecycle.
VIII. Real-world cooperation cases
Our Transformer Core Grounding Current Monitor provides real-time tracking of grounding current to safeguard core integrity. It delivers instant alerts for abnormal readings and uses AI to forecast issues like poor grounding 48 hours in advance by detecting sustained current increases. This enables early diagnosis of multi-point grounding faults and supports a shift from scheduled inspection to condition-based maintenance, enhancing operational safety and continuity in applications such as the Bugumasi potash mine.
IX. Application Scenarios
- Substations & Power Plants: Essential for protecting core grid assets by continuously monitoring core grounding conditions in critical oil-immersed transformers.
- Industrial Facilities: Provides continuous condition monitoring for key transformers in steel, chemical, and data center operations to prevent unplanned downtime.
- Critical Grid Nodes: Enhances power supply reliability by monitoring transformers at major urban distribution hubs and vital transmission lines.
X. Our Service
Our after-sales service and technical team solemnly promises
Pre-Sales Service
Consultation & Guidance: 24/7 online support with expert engineers to clarify needs, recommend solutions, and advise on pricing and processes.
On-Site Inspection: Engineers visit sites for precise measurements and environmental assessment, deliver detailed reports to support tailored system design.
After-Sales Service
Year Warranty: Covers material/manufacturing defects as per contract.
Dedicated Support: One-on-one follow-up from a specialized team for seamless assistance.
Multi-Channel Help: Support via contacts, project teams, or website; fast global coordination for repairs or replacements during warranty.
XI. Product usage tutorials, solutions, and technical problem notifications
Transformer Core Grounding Current Monitor is easy to install; it only requires reserving a mounting bracket at a suitable location on the iron core grounding copper busbar.
During on-site installation, fix the sensor to the mounting bracket from the copper busbar connection point, ensuring that the copper busbar passes through it without contact.
XII. Packaging and Transportation
XIII. Factory Strength
1. Qualification Certificates
2. Innovative technologies/capabilities
3. Supply Chain Advantages
- End-to-End Lifecycle Support – Covers R&D to decommissioning for seamless assistance.
- Fast Spare Parts Supply – Rapid delivery from stocked inventory to cut downtime.
- Responsive Technical Services – Remote/on-site help for troubleshooting and upgrades.
- Long-Term System Stability – Ensures reliable, accurate operation over many years.
- Continuous Customer Value – Lowers failure risks, extends equipment life, and optimizes maintenance.
4. Professional production equipment (CNC)
XIV. FAQ
Q1. Why must the transformer core be single-point grounded?
A1: To prevent floating potential discharge and overheating caused by the alternating magnetic field, single-point grounding safely releases induced voltage and avoids circulating currents.
Q2. What is core grounding current? Why monitor it?
A2: It is the current through the core's only grounding lead. Normally below 100mA, abnormal increases may indicate multi-point grounding or internal insulation faults.
Q3. How is current measured?
A3: Using a through-core current transformer (CT) around the grounding wire, enabling safe and isolated measurement without disconnecting the ground connection.
Q4. What parameters are monitored?
A4: Core grounding current RMS value and historical trends for fault analysis and alerts.
Q5. What current level is abnormal? How are thresholds set?
A5: Normal: <100mA; Concern: 100mA–1A; Alarm: >1A. Thresholds are based on manufacturer guidance, industry standards, and historical data, typically with multi-level warnings.
Q6. Does installation affect grounding safety?
A6: No. The system connects in parallel without altering the original grounding circuit.
Q7. What to do if current exceeds limits?
A7: Verify data and trends, conduct oil chromatography, perform insulation resistance tests if needed, and inspect internally if a fault is confirmed.
Q8. Does the system require maintenance?
A8: Minimal maintenance needed: periodic sensor inspection, system self-test, and ensuring stable power and communications.
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