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Short-Circuit and Earth Fault Indicators

Horstmann offers a comprehensive range of short-circuit and earth fault indicators, which are characterised by extremely high reliability, top quality and state-of-the-art functions.
There are different products and system solutions for medium voltage underground cable and overhead line networks with and without directional fault indication. They are suitable for radially fed, open ring and closed ring networks as well as for networks with a distributed energy generation. The following applies for all applications:

If a fault occurs:

  • Quick identification of the fault location, immediate local display and communication to SCADA
  • Targeted de-energising/switching
  • Quick restoration of power supply

This means: utilities can minimise the time and effort in searching for faults and benefit from high availability of energy supply. This helps them save costs and optimise their earnings.

  • With continuous monitoring:

  • High transparency: Provision of high accuracy current and other measurements from the distribution network
  • Transmission of simple station reports like door contact, temperature alarm and status of the intelligent substation
  • Simple upgrading of existing medium-voltage switchgears with retrofit solutions

With this, utilities will always have an overview of the situation in the network as well as being able to create predictive maintenance programs.

The product series for cable networks:

The Sigma series provides short-circuit and earth fault indicators for networks with a low-impedance neutral earthing.
The Sigma D series provides directional short-circuit and earth fault indicators for networks with a low-impedance neutral earthing as well as compensated and isolated networks (Sigma D+ and Sigma D++) and networks with distributed energy generation.
The ComPass B series is for situations requiring highly accurate network monitoring in combination with directional fault indication. ComPass BS 2.0 is used for situations where remote switching is required.

The following selection scheme makes it easier to find the right indicator. Via links you will be redirected to the corresponding product pages.

Selection scheme


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