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Contactless Fault Indicator for High Voltage Applications INKA 3 Indicator of fault currents from short circuits and ground connections provides indication of excessive currents through power lines on phase-to-phase short circuits and indication of ground fault 5th harmonic current in compensated high voltage power distribution systems.
Related DocumentsGeneral InformationINKA 3 is an indicator of fault currents from short circuits and ground connections provides indication of excessive currents through power lines on phase-to-phase short circuits and indication of ground fault 5th harmonic current in compensated high voltage power distribution systems. The power line condition is monitored by measuring of changes in the electromagnetic field. Fault conditions (phase-to-phase fault current resulting in voltage failure in the power line and the 5th harmonic current on ground fault, respectively) are indicated either with relay break contacts for transmission to control room using remote control section switch radio communication or optically by flashing indicator light or by GPRS data transmission. It is further possible to read the state of the Indicator using a PC via an RS 232 serial link. Constants are preset by the manufacturer, they can, however, be modified according to the agreement..
The Indicator draws power either from a remote control section switch electronic circuitry or from built-in accumulators charged from a solar panel. The instrument comes in a plastic box (IP 65 rating) designed for installation onto a pole. The instrument is to be mounted on an overhead high voltage power line pole about 2 to 3 meters below the power line. It is, however, essential to situate the instrument to be faced to the power lines, so that the instrument’s face (its cover) is perpendicular to the direction of the power line. The optional solar panel is separate and it is to be positioned facing the south. If the optical indicator is used, it is to be installed in a place allowing as good visibility from an accessible point, such as road, as possible.
The instrument is galvanically isolated from the power line and it can be installed without disrupting power supply while complying with the relevant requirements of local standards. The instrument is usually installed in combination with a remotely controlled section switch, via the communication link of which (a radio transceiver) the information on phase-to-phase or ground fault current is transmitted. INKA 3’s both output signals (potential-free relay contacts) and power supply input from 10 to 16 V DC are connected to the remote control section switch control circuitry. The instrument does not draw more than 10 mA in its power supply line. In order to be able to read the state of the instrument, an RS 232 communication interface is also to be connected. The instrument’s power supply, signal, and communication wires go to the unit in a cable duct where they are connected to a screw terminal board. To facilitate the installation, an optional module, Inka-expand, can be purchased to be installed onto the section switch distribution board’s DIN strip. A seven-wire screened cable is to be used to connect an INKA 3 unit.
If installed on a pole without a remote control section switch, the solar panel and optical indicator options or GPRS data transmission are used. In such a case the solar panel and optional optical indicator are connected to an INKA 3 using the cables supplied with the unit.
Models, Optional Equipment and SoftwareINKA 3 To be installed in combination with remote control section switch, via the communication link of which (radio transceiver) the phase-to-phase or ground fault current data are transmitted. INKA 3’s both output signals (potential-free relay contacts) and power supply input from 10 to 16 V DC are connected to the remote control section switch control circuitry. The instrument does not draw more than 10 mA in its power supply line. An Inka-expand module, which also features an RS 232 serial communication port connector, can be installed at the section switch distribution board. The communication interface can be utilized to monitor the measurement data or for servicing purposes. INKA 3-Solar For installation at a point without a remote control section switch. The Indicator is powered from built-in accumulators that are charged from solar cells. The solar panel is separate and to be attached to the pole independently. Fault indication is by a flashing indicator light. INKA 3-GPRS For installation at a point without a remote control section switch. The Indicator is powered from built-in accumulators that are charged from solar cells. The solar panel is separate and to be attached to the pole independently. Status of the indicator is transmitted via GPRS. Indicator light can be added. INKA–expand A module facilitating connection to the section switch control circuitry. The module is installed on the section switch distribution board DIN 35 strip. It also has an RS 232 serial communication port connector. Module INKA-optoModule for optical signalisation of fault. Module INKA-solar Power supply solar panel. INKA3–W A program to run under Windows 98 and higher. It can be used to monitor the measurement data or for servicing purposes. The program also allows archiving of each INKA 3 Indicator’s settings.
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INKA 3 - Manual [401.5 Kb]