dear sir/madam,i have observed from high voltage single line diagrams that,the designers are using pilot cables and control cables in hv panel to distribution transformer,and one hv panel to another hv panel.actually what is the meaning of pilot cable and what is its application.and also control cable ntrol cables are passing from panel to transformer,whereas pilot cables are passing from hv panel to other hv panel.please do let me know the difference and their application.thank you
In general, plot cables are a special case of control cables although the distinction between these terms is rather vague. A control cable is a cable that is used for a control function. Control cables don't transfer power, but rather are used to convey signals that control how power is transferred. Control cables can include voltage and current signals derived from instrument transformers and used for measurement and protection functions. The category of control cables also includes conductors used to transfer switching signals from one point to another. Control cables tend to be shorter in length - perhaps contained within an electrical substation or other installation. The term 'pilot cable' may be applied to conductors that convey voltage or current signals from one point to another for comparison with other voltage or current signals as part of a protection scheme. Pilot cables may also be used to transfer switching signals from one point to another. While the the terminal points of a pilot cable may be within an installation, they may also be in different installations that could be miles apart.
sanme as above of monophoto
