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Online Surge Arrester Monitor EXCOUNT-III

Provides users with remote real-time surge arrester monitoring, diagnostics and analysis in high voltage networks

EXCOUNT-III is a complete remote real-time surge arrester monitoring, diagnostics and analysis system. It permits the registration of the total number of discharges, the surge amplitude and wave-steepness, the date and time of occurrence, the total leakage current as well as the resistive leakage current through the surge arrester. In addition, the equipment can be used to define the residual voltage across the arrester for the actual surge, which in turn can be used to better estimate overvoltages in the station for a more detailed insulation co-ordination evaluation.

EXCOUNT-III supports the protocol IEC 61850, Ed. 2, and communicates remotely via the fibre optic cable to permit the user to add signals into an existing data collection system (SCADA). Moreover, enabling remote retrieval of data EXCOUNT-III eliminates the need for substation visits solely to monitor surge arrester condition, while also enabling the highest possible personnel safety standard by not having to approach an energized arrester to perform online diagnostic measurements.
 

Applications

  • For use with all makes and types of gapless arresters 

Why Hitachi ABB Power Grids?

  • No voltage added to the residual voltage of the arrester 
  • Complete monitoring of the health of the substation and the surge arresters
  • Remote real-time monitoring – minimizes substation visits and enables the highest possible personnel safety standard
  • Supports IEC 61850, Ed. 2, for integration to existing SCADA system
  • Enables analysis of surge current impulses
  • Estimation of overvoltages in the station allows for a more detailed insulation co-ordination evaluation
  • Simple to use
  • Maintenance free

Brief performance data

The EXCOUNT-III system consists of individual sensors that are connected by an optical fibre connection. Each sensor can be interrogated individually and be integrated to existing SCADA system.

    EXCOUNT-III
Climatic conditions Sealed water-tight design, IP67  
Power supply 100-250 Volt, AC (50-60 Hz) or DC  
Surge Registration    
Minimum counting threshold Adjustable 100 -1000 A  
  EXCOUNT-IIIM EXCOUNT-IIIA
Amplitude classification/ measurement (8/20 μs) The surge amplitude is classified as follows:
100-999 A
1000- 4999 A
5000 – 9999 A
>10 000 A
The surge amplitude is classified as follows:
100-999 A
1000- 4999 A
5000 – 9999 A
>10 000 A
Additionally, EXCOUNT-IIIA provides the measured surge amplitude between 100-20 000 A. EXCOUNT-IIIA register amplitude, wave-steepness and calculates estimated overvoltage at connection point.
Time stamp Yes  
Time resolution 1 s  
Memory capacity 30 years of data  
     
Leakage current measurement    
Measuring range of total leakage current 0.2 - 12 mApeak  
Measuring range of resistive leakage current (peak level) 10 - 2 000 μA  
Measuring frequency range 48 - 62 Hz  
     
Communication    
Optical fibre connection Yes  
Protocol IEC 61850, Ed. 2. TCP/IP with web server in the device  
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