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1. (WO2017203205) APPARATUS FOR AND A METHOD OF DETECTING LEAKAGE OF CURRENT

Pub. No.:    WO/2017/203205    International Application No.:    PCT/GB2017/051279
Publication Date: Fri Dec 01 00:59:59 CET 2017 International Filing Date: Wed May 10 01:59:59 CEST 2017
IPC: G01R 19/00
G01R 27/02
G01R 27/16
G01R 31/02
G01R 31/12
G01R 31/14
Applicants: EXACT PROJECTS LIMITED
Inventors: HAWKINS, Peter Thomas Edward
BATHE, Colin Benjamin
Title: APPARATUS FOR AND A METHOD OF DETECTING LEAKAGE OF CURRENT
Abstract:
Apparatus (1) is for detecting electrical current in a support (2) for an overhead power line (3) adapted to carry AC electricity at a nominal frequency. The apparatus (1) comprises a first and a second electrical contact (16, 17). The first and second electrical contacts (16, 17) are adapted to be electrically coupled to the support (2) in spaced apart relationship, in use. A voltage detector (7) is coupled to the first and second contacts. A first voltage signal generator (11) is coupled to the first electrical contact (16) and is adapted to generate a voltage signal at a second frequency. A processor (15) is coupled to an output from the voltage detector (7). The voltage detector (7) is adapted to detect a first voltage differential between the first and second electrical contacts (16, 17) at a first frequency corresponding to the nominal frequency, and to detect a second voltage differential between the two electrical contacts (16, 17) at the second frequency. The processor (15) receives the first and second voltage differentials, and the processor (15), dependant on the detected first and second voltage differentials, generates an output signal indicative of the presence of an electrical current in the support (2).