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  • Directorio de Eficiencia energética

Shirla - the cable sheath testing and fault location system

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Operators of electrical distribution networks, as well as network managers at photovoltaic power plants, wind farms, street lighting or in industrial parks want to find cable faults quickly. Easy to handle and operate and reliable determination of the fault location take priority. BAUR Prüf- und Messtechnik GmbH (Sulz, Austria) took all this into consideration while designing “shirla”, a lightweight device weighing not even 20 kg, for cable/cable sheath testing and cable fault location and pinpointing. Powered via the mains supply or via a built-in accumulator, shirla enables cable and cable sheath testing up to 10 kV DC. Hence, it is suitable for use in low and medium voltage networks testing control cables and telecommunication cables.
 
 
Preliminary location of low ohmic faults, e.g. sheath faults, works with direct current and is based on the Wheatstone measuring bridge. Hereby, a measuring bridge is balanced with a variable resistance. In shirla, the measuring bridge is used according to Murray (bridge circuit with one auxiliary return) and Glaser (bridge with two auxiliary returns). When measurement is completed, shirla displays the distance to the fault location, either in percentage of the measured cable line or in meters. For distance calculating, the device considers inputs for length, conductor cross-section and conductor material of the cable and its segments to increase the accuracy of the result.
 
 
As length and position of the cable are usually known for in-house infrastructures, the fault can be detected within a few meters using a line measuring device (running wheel). Then exact pinpointing only takes a short time. The search receiver KMF 1 or the universal receiver UL 30 can be used for pinpointing. The step voltage method can be applied with both receivers and the sheath fault is often located within a few minutes. shirla delivers the required voltage (e.g. rectangular shape). Depending on cable type, the operator can adjust this pulsed voltage continuously between 100 V and 10 kV.
 
 
shirla - the cable sheath testing and fault location system - has proven to be a universal tool for finding cable sheath faults in low voltage structures, such as the lighting network, and also within medium voltage networking, e.g. of wind power plants. Operators and makers of solar parks use shirla regularly for testing and fault location, even on 1 kV DC cables. Apart from faults in the sheath (earth-sensitive faults), low and high ohmic faults can be located with the BAUR device.
 
Power R&D | News published on 27 / 08 / 2012 by Bharat Vasandani

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