System and method for detecting branch circuit current

摘要

According to one aspect, embodiments of the invention provide a system monitor for a load center comprising a current sensor configured to be coupled to a circuit branch within the load center and to produce a measurement signal having a level related to a current level of the circuit branch, a sensor circuit coupled to the current sensor and removably coupled to a terminal, the sensor circuit configured to provide the measurement signal to the terminal, and a controller coupled to the terminal and configured to monitor signals at the terminal, wherein the controller is further configured to detect disconnection of the current sensor from the terminal based on a signal level at the terminal.

主权项

1. A system monitor for a load center comprising:
a current sensor configured to be coupled to a circuit branch within the load center and to produce a measurement signal having a level related to a current level of the circuit branch; a sensor circuit coupled to the current sensor and removably coupled to a terminal, the sensor circuit configured to provide the measurement signal to the terminal; and a controller coupled to the terminal and configured to monitor signals at the terminal, wherein the controller is further configured to detect disconnection of the current sensor from the terminal based on the level of the measurement signal at the terminal falling outside of a predetermined envelope for a predetermined period of time, wherein the controller includes a timer having a value equal to the predetermined period of time, and wherein the controller is further configured to start the timer in response to detection of the signal level at the terminal falling outside of the predetermined envelope and determine that the current sensor is disconnected from the terminal in response to expiration of the timer.