Method for judging fault of signal lamp based on active power

• Main Authors: ZHANG LINXIANG, JIANG XUEMING, HAO WENBING, YU YANGYANG, LI DONG, HE JIANGTING, WU HAIYUN
• Format: Patent
• Language: Chinese; English
• Published: 23.07.2021
• Subjects: PHYSICS; SIGNALLING; TRAFFIC CONTROL SYSTEMS

The invention discloses a method for judging a signal lamp fault based on active power. The method comprises the following steps that a master controller acquires a signal lamp electric signal through a signal acquisition unit, calculates corresponding effective voltage, effective current and active power and performs fault analysis, and specifically comprises the following steps that S1, a master controller selects a test mode to find the minimum active power when a signal lamp works normally and records a voltage value at a current vertex; S2, a minimum active power threshold value Z and a voltage initial value M at a current vertex are set; S3, effective voltage, effective current and active power are calculated, and a curve is fit; S4, whether the current active power is smaller than the minimum active power or not is judged; S5, whether the current active power is reduced by 5% compared with the historical active power is judged; and S6, whether the current effective current is in a reduction interval an