Detection system for detecting impedance variation in a neutral conductor, transformer station compising such a system and method for detecting impedance variation in a neutral conductor with such a system

摘要

#$%^&*AU2013209382B220170112.pdf#####is DETECTION SYSTEM FOR DETECTING IMPEDANCE VARIATION IN A NEUTRAL CONDUCTOR, TRANSFORMER STATION COMPRISING SUCH A SYSTEM AND METHOD FOR DETECTING IMPEDANCE VARIATION IN A NEUTRAL CONDUCTOR WITH SUCH A SYSTEM 5 ABSTRACT This detection system (20) is suitable for detecting impedance variation (84) in a neutral conductor (22) of a multiphase AC electrical network, the electrical network 10 comprising P phase conductors (34) and one neutral conductor (22), where P is an integer greater than 1. The detection system (20) comprises a group (42A) of P voltage sensors (56A, 58A, 60A), each voltage sensor (56A, 58A, 60A) being suitable for measuring the voltage of a phase respective conductor (34) in relation to the neutral conductor (22), 15 and a supervising device connected to each of the voltage sensors (56A, 58A, 60A) via a data link (62). The detection system (20) further comprises (N-1) other group(s) (42B, 42C, etc.) of P voltage sensors (56B, 58B, 60B, 56C, 58C, 60C), where N is an integer greater than 1, the N groups of voltage sensors (42A, 42B, 42C, etc.) being arranged at different 20 locations along the electrical network, and the supervising device is suitable for detecting, between two successive groups of sensors (42A, 42B), a variation in the voltage of a given phase conductor (34) in relation to the neutral conductor (22), in order to detect impedance variation (84) in the neutral conductor (22) and locate said impedance variation (84) between the two successive groups of sensors (42A, 42B). 25 Figure 13/3 Overvoltage detection on one of the phases by a voltage sensor 00 Alarm transmission from the voltage sensor to the supervisor i I Querying of the voltage sensors of the other two 120 phases by the supervisor Significant undervoltage detection by the voltage 130 sensors of the other pages Search for potential 140 faise alarm Determination of voltage sensors detecting the arnomaly or not 50 Location of fault 160 Fig3