G - Physics – 01 – R
Patent
G - Physics
01
R
324/58.01
G01R 31/02 (2006.01) H02H 1/00 (2006.01) H02H 5/10 (2006.01)
Patent
CA 1153425
Title: Improved Ground Monitoring System Inventor: ABSTRACT An improved ground monitoring circuit for detecting the integrity and proper connection of the ground conductors in an electrical cable of an elec- trical power distribution system of a type that is commonly used at a surface mining site. A complete conductive loop is established between the ground conductor, or conductors, and the ground check, or pilot wire of the cable. A sending signal at a frequency higher than the power frequency is coupled onto the ground monitoring loop. The monitoring loop includes a terminating resistor of predetermined value. The sensing signal on the ground conductor in the loop is isolated from local ground by means of an impe- dance element that presents a high impedance at the sensing signal but not at the power frequency. The impedance element is connected between the ground conductor of the power cable and the local ground. When successive lengths of cable are series connected, the impedance elements are connected in parallel with each other and are connected from an end of the ground conductor to the local earth ground, thereby to avoid series connections of the impedance elements in the ground conductors. The voltage and current in the loop are separately sampled. Various comparisons of the voltage and current samples are made to detect any deviation in the resistance of the loop. Any deviations from desired conditions in the loop produce output signal that changes the condition of a trip relay. The trip relay initiates action that ulti- mately opens circuit breakers to remove power from the cable.
372820
Amf Incorporated
Swabey Ogilvy Renault
LandOfFree
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