Schneider Electric USA, Inc.

Other

E Avery Ashby

Jon Andrew Bickel

James F Clark

Larry E Curtis

Marcelo Alejandro Perez

A method and program for minimizing objectionable currents while still providing neutral-to-ground voltage measurements by controlling a switch to determine when the neutral-to-ground impedance is placed in an electrical circuit.

System and method to measure neutral-to-ground voltage

A time synchronization device (TSD) that produces a synchronization signal and couples it onto energized power conductors in a power monitoring system. Monitoring devices coupled to the TSD include frequency detection algorithms, such as a Goertzel filter, for detecting the synchronization signal and interpreting the information encoded in the signal. The frequency of the synchronization signal may correspond to the fourth or tenth harmonic component of the fundamental frequency of the voltage on the power conductors. The magnitude of the signal is selected to be above the expected or established noise floor of the power monitoring system plus a predetermined threshold. The duration of the signal can be varied, such as lasting a full cycle of the fundamental frequency. Multiple TSD signals received in a predetermined sequence may be converted into digital words that convey time, configuration, reset, control, or other information to the monitoring device.

Method and apparatus for synchronizing data in utility system

A power monitoring system for monitoring characteristics of power transmitted through one or more power lines comprises a meter base and multiple option modules. The meter base includes a processor and associated circuitry for processing signals derived from sensors coupled to said power lines and producing output signals representing selected characteristics of the power transmitted through the power lines, and a housing containing the processor and the associated circuitry and having a first surface adapted to be mounted on a DIN rail, and a second surface containing multiple connectors for receiving multiple modules and electrically connecting the modules to the processor and the associated circuitry. Each of the multiple option modules includes a housing having a first surface containing a connector that is complementary with the multiple connectors in the second surface of the meter base so that any of the option modules can be plugged into any of the multiple connectors in the second surface of the meter base, and circuitry within the housing of the option module for interconnecting with the processor and the associated circuitry in the meter base. The first surface of the meter base housing may be adapted for optional mounting on the DIN rail or a flat panel, and contains a connector for mating with a complementary connector on the opposite side of the flat panel through a hole in the flat panel.

Growing community of inventors

Murfreesboro, TN, United States of America

E Avery Ashby