Monitoring Solutions

  • Devices for monitoring and recording of the discharge process and the condition of the arrester, detecting early failures before security of supply is threatened.
  • Provide information about the number of recorded discharge events as well as total leakage current.
SURGE IMPULSE COUNTER LEAKAGE CURRENT METER 0..30 MA LEAKAGE CURRENT METER 0..50 MA AUXILIARY CONTACT FOR CONNECTION TO REMOTE SIGNALLING EQUIPMENT DISPLAY SEPARATED FROM SENSOR, MAX. DISTANCE 250 M
DCC 2 X
DCC-M 2 X X
DCC-ML 2 X X
DCC/RC  X  X
DCC-M/RC 2  X  X  X
DCC-ML/RC 2  X  X  X
DCC-S 2 X X

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Product Description

SURGE IMPULSE COUNTER LEAKAGE CURRENT METER 0..30 MA LEAKAGE CURRENT METER 0..50 MA AUXILIARY CONTACT FOR CONNECTION TO REMOTE SIGNALLING EQUIPMENT DISPLAY SEPARATED FROM SENSOR, MAX. DISTANCE 250 M
DCC 2 X
DCC-M 2 X X
DCC-ML 2 X X
DCC/RC  X  X
DCC-M/RC 2  X  X  X
DCC-ML/RC 2  X  X  X
DCC-S 2 X X

A permanently applied voltage causes a continuous leakage current in surge arresters without spark gaps (metal oxide arresters). While capacitive current component is dominating with ap- plied continuous operating voltage, the resistive component (A to kA range) is prevailing in case of temporary overvoltages or discharge processes. Causes a resistive leakage current, due to overload and/or ageing of the metal oxide varistor, such a big amount of heat, which no longer can be dissipated via the arrester surface, the arrester will be destroyed (thermal run- away).

The following problems may occur during the operating time of the arrester:

  • Frequent current impulses with high amplitude or energy-rich discharge processes lead to irreversible changes of the varistor characteristic (degradation). The leakage current in- creases subsequently.
  • A change in the voltage distribution caused by external pollution of the arrester housing may result in an increased power dissipation in the metal oxide varistor stack.

A rise of varistor temperature will be the consequence from increased leakage current or in- creased power dissipation caused by such operating conditions. This temperature increase will be enhanced by the negative temperature coefficient of the metal oxide varistors.