Online GIS PD monitoring system according to IEC61850 protocol

Edwiin
05/16/2025

Partial Discharge (PD) Detection in GIS
Both UHF (Ultra-High Frequency) and ultrasonic methods are effective for detecting partial discharges (PD) in Gas-Insulated Switchgear (GIS), each with distinct advantages:
  • UHF Method: Detects PD pulses via high-frequency electromagnetic waves generated by PD activity within GIS.
  • Ultrasonic Method: Identifies ultrasonic waves produced by bubble shocks caused by PD.

Key Monitoring Data

The main data monitored by a GIS PD monitoring system includes:
  • UHF PD signals
  • Ultrasonic PD signals
  • Transformer voltage signals
The online monitoring system collects these signals and generates alarm information based on the GIS’s operational status.
System Composition
A GIS PD monitoring system comprises three core components:
  • Sensors: Capture PD-related signals.
    • UHF PD sensors detect electromagnetic signals.
    • Ultrasonic sensors measure acoustic signals.
  • Data Preprocessing System: Conditions and prepares signals for analysis.
  • PD Monitoring IED (Intelligent Electronic Device): Processes, stores, and displays data at the bay level.

Signal Flow and Communication

  • Process Level: UHF and ultrasonic sensors acquire electrical and acoustic signals, which are conditioned and transmitted to the PD monitoring IED.
  • Bay Level: The IED stores, displays, and processes data. Specific communication service mapping (per IEC 61850) defines network transmission standards for sampled values between the process and bay levels.
  • Station Level: Data is reported from the bay level to the station level via predefined communication services for centralized monitoring.

System Structure

The figure illustrates the architecture of a GIS PD monitoring system compliant with IEC 61850 standards.
Edwiin

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