Provided is an apparatus and method for identifying a specific lost current transformer signal of number of CT signals provided by a corresponding number of CTs coupling a protective device to at least one protection zone. The solvent comprises a mixture of 80% 1-methoxy-2-propanol and 20% dipropylene glycol monomethyl ether. The method assigns a priority to the document, based on a text classifier such as a Bayesian classifier or a support-vector machine classifier. The wireless telecommunications network may instruct the mobile stations in the high-traffic coverage area to use the appropriate frequency spectrum.