NS-20 Voltage Sensors and SS-30 Current Sensors are used as fault detectors in insulated or grounded overhead grids within the system for remote control of switch disconnectors, e.g. Remote Terminals DT-20RN. The Voltage Sensors NS-20 consist of a non-conventional voltage elements (capacitive dividers) and are used to measure the voltages UL1, UL2, UL3. Voltage Sensor is distributed in the medium voltage cable connector and the IK-20S Fault Indicator, and via the PK terminal box and the cable it is connected to the Fault Indicator embedded in the disconnecting switch Remote Terminal. SS-30 Current Sensors are simply mounted on the insulators of cable connectors and are used to measure the currents IL1, IL2, IL3.

IK-20S Fault Indicator is an intelligent electronic unit that accepts current signals from three SS-30 Current Sensors and voltage signals from six SS-20 Voltage Sensors, and processes and detects a ground fault and short circuit in an insulated or grounded overhead grid. Short circuit detection is based on current measurement, and detection of a directional ground fault is determined by transient analysis of residual current and voltage.

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• simple mounting and connection of the SS-30 sensor on the medium voltage cable connector insulators
• voltage sensors NS-20 integrated in test connection on medium voltage cable connector
• detection of short circuit and ground fault in an isolated or grounded overhead grid
• measurement of disconnecting switches IL1, IL2, IL3 and UL1, UL3, UL3 with connection to IK-20S Fault Indicator
• external installation, from -40 ° C to + 55 ° C

Current Sensors SS-30

• rated primary current 50 … 400 A
• accuracy of current measurement ± 0.5%, 10 P25

Voltage Sensors NS-20

• accuracy of the voltage measurement ± 3%

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