| 主权项 |
1. A system for monitoring switchgear having a main bus, a plurality of feeder circuits, and an input circuit, the system comprising:
a plurality of temperature sensors coupled to the main bus at nodes, wherein a node is a connection point between said main bus and each said feeder circuit; an input current sensor positioned to measure the current supplied to said main bus by said input circuit; a plurality of output current sensors positioned to measure the current flowing through said plurality of feeder circuits; a processor; one or more storing units for storing signals output from the temperature and current sensors; software program instructions which are stored in one or more of said storing units and when executed by the processor cause the system to perform a method comprising:
receiving configuration information defining the relative locations and electrical connections between said main bus, said feeder circuits, said input circuit and said nodes;determining the current flow through one of said nodes by subtracting, the current flow through each said feeder circuit upstream from said node, from the current supplied by said input circuit;determining an alarm condition if the temperature at said node exceeds a predetermined temperature value for a given current flow through the node; anddisplaying said alarm condition to a switchgear operator. |
