Smart Substation Voltage Transformer (VT) Digital Interface Solution
Smart Substation Digital Interface Scheme
Technical Focus: Deep integration of the IEC 61850 protocol
This solution deeply integrates the IEC 61850 standard to build a future-oriented digital transformer system, achieving device interoperability, efficient data sharing, and intelligent system operation and maintenance.
Key Innovations
- Composite Sensing Technology
- Rogowski Coil + Capacitive Voltage Divider Composite Sensing: Combines the Rogowski coil's wide frequency response (suitable for transient harmonics) with the high accuracy of capacitive voltage division, achieving non-saturated measurement of full-frequency signals (0.5Hz ~ 3kHz), eliminating ferroresonance risks inherent in traditional iron-core transformers.
- Embedded High-Precision Merging Unit (MU)
- Supports IEC 61850-9-2LE Sampled Value (SV) transmission protocol.
- Sampling rate: 4000Hz, meeting transient process analysis requirements.
- GOOSE tripping delay <3ms, ensuring fast response of protection systems.
- Real-time clock synchronization accuracy ±1μs (based on IRIG-B/PTP), guaranteeing timestamp consistency for system-wide data.
- Intelligent Self-Diagnosis System
- Ferroresonance Online Early Warning: Monitors characteristic resonance frequencies (30-300Hz) in real-time and actively triggers damping strategies.
- Winding Temperature Rise Warning: Embeds temperature sensors to dynamically analyze temperature rise curves and predict insulation aging risks.
- Fault Location: Achieves bay-level precision, supporting remote operation and maintenance decisions.
- Industrial-Grade Electromagnetic Compatibility (EMC)
- EMC Immunity Level: Class IV (Complies with GB/T 17626):
- Radio Frequency Electromagnetic Field Immunity: 10V/m (80MHz~1GHz)
- Surge/EFT Immunity: ±6kV/±4kV, suitable for complex electromagnetic environments.
Protocol Support & Core Specifications
|
Category |
Parameter |
Performance Indicator |
|
Communication Protocol |
IEC 61850-9-2LE |
Supported |
|
Sampled Value (SV) |
Sampling Rate |
4000Hz |
|
GOOSE Performance |
Trip Command Delay |
<3ms |
|
Time Synchronization |
Real-time Clock Accuracy |
±1μs (IRIG-B/PTP) |
|
Measurement Accuracy |
Phase Angle Error |
<±0.2° |
|
EMC Level |
RF Immunity |
Class IV (10V/m, 80MHz-1GHz) |
Technical Value
- Fully Digital Architecture:
Replaces analog signal cables with direct digital outputs (SV) from the MU, reducing system costs and operation & maintenance complexity. - Enhanced Safety & Reliability:
Self-diagnosis functions detect 90% of potential faults in advance. Class IV EMC immunity withstands strong electromagnetic interference within substations. - System Compatibility:
Deeply integrates the IEC 61850 protocol stack for seamless connection to various smart substation monitoring/protection systems (e.g., Siemens, ABB, NARI Group).
07/07/2025
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