Fault Indicators IK-20 with Combined Sensors KSNS-50 are used for detection and indication of a ground fault and short circuit in insulated medium voltage overhead grids. Unconventional current and voltage sensors, combined sensors respectively, are used as fault detectors. Combined sensors are mounted on insulators of cable connector of a disconnecting switch. The current sensor is the Rogowski coil, and the voltage sensor is of capacitive type which it connected to the preamplifier in the IK-20 Fault Indicator. Short circuit detection is based on current measurement by means of current sensors, and the detection of the directional ground fault is determined by the transient analysis of residual current and voltage.

In the event of a failure, the sensors and the fault indicator detect, indicate and register a fault before the power line is switched off by the protection. The Fault Indicator IK-20 indicates the type and direction of the fault locally on the LCD and LED elements, and the information is remotely sent using a GSM / GPRS unit, a radio modem or Remote Terminal DT-20RN to the control center. Based on this information and the SCADA system in the center it is very easy to determine the fault location, isolate the faulty location, establish a new power structure and organize a quick repair. If there is no communication equipment, the SL-50 Signal Lamp (located on the pillar) can signal the fault locally. Parameterization of the device (defining the ground fault and short circuit current, reset mode indicator trip time, etc.) is performed very easily using the LCD and keyboard.

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• detection of the ground fault (Io) and short circuit (I>>) in the insulated medium voltage overhead grid
• indication of the fault type (Io or I>>) and the fault direction on the LCD, LED elements and relay outputs
• unconventional combined current/voltage sensors
• very simple parameterization with LCD and keyboard if needed on site
• very small dimensions, great savings in space, wiring and testing
• a combination of the SIK Fault Indication System in remote control stations with the SCADA system for visualizing the state of the grid in the center provides an economical solution for rapid detection of a fault location in a complex grid and increased availability of the grid

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