Abstract: The present disclosure is a system for monitoring power that has a unified polyphase distribution transformer monitoring (PDTM) device that interfaces with at least three electrical conductors electrically connected to a transformer. In addition, the PDTM device measures a current and a voltage of each of the three electrical conductors. Additionally, the system has logic that calculates values indicative of power corresponding to the transformer based upon the currents and the voltages measured and transmit data indicative of the calculated values.

Abstract: The present disclosure relates to a device for measuring voltage from a conductor. The device has first and second cylindrical electrodes positioned about the conductor and a circuit interfaced with the first and second electrodes that generates a signal proportional to a voltage of the conductor.

Abstract: A system for monitoring power in accordance with the present disclosure has a transformer monitoring device that interfaces with two electrical conductors electrically connected to a transformer at a location on a power grid and to measure a first current and a second current through the first electrical conductor and the second electrical conductor, respectively. Further, the transformer monitoring device measures a first voltage and a second voltage associated with the first electrical conductor and the second electrical conductor, respectively, and the transformer monitoring device comprises two separate and distinct current measuring devices integral therewith. Additionally, the system comprises logic that calculates values indicative of power corresponding to the transformer based upon the first current and the first voltage and the second current and the second voltage.

Abstract: A system for monitoring power in accordance with the present disclosure has a first transformer monitoring device that interfaces with a first electrical conductor electrically connected to a transformer at a first location on a power grid. The first transformer measures a first current through the first electrical conductor and a first voltage associated with the first electrical conductor. In addition, the system has a second transformer monitoring device that interfaces with a second electrical conductor electrically connected to the transformer. The second transformer measures a second current through the second electrical conductor and a second voltage associated with the second electrical conductor. Further, the system has logic configured to calculate values indicative of power corresponding to the transformer based upon the first current and the first voltage and the second current and the second voltage.

Abstract: A system and device for measuring voltage in a conductor having a voltage provides a first electrode surrounding and spaced from the conductor, and a second electrode surrounding and spaced from both the conductor and the first electrode such that there is no contact between the conductor and the electrodes or between the first and second electrodes. The first electrode is connected to a first input of a differential amplifier circuit and the second electrode is connected to the other input of the differential amplifier circuit. The output of the differential amplifier circuit provides a voltage signal in proportion to the voltage of the conductor, thus providing a non-contact means for measuring the voltage of a conductor without requiring a connection to ground while simultaneously providing a high level of rejection of external interference.

Abstract: There is disclosed a method of metering electricity that includes calculating a first accumulated in-phase current indicative of a non-voltage component of energy flow to one or more customer premises during a period of time by a distribution transformer meter (DTM) coupled to a distribution transformer (DT) and calculating second accumulated in-phase current (AIPC) indicative of a non-voltage component of energy flow during a period of time by a feeder current meter coupled to a feeder line. The method further includes transmitting the first AIPC and the second AIPC to a data collecting computing device and comparing the first AIPC with the second AIPC to determine if electricity theft has occurred.

Abstract: There is disclosed a method of detecting the configuration of a network having a feeder line with a plurality of feeder meters and distribution transformer meters (DTMs) coupled thereto and with one or more customer meters and/or customer configuration modules coupled to the distribution transformers. The method includes the steps of having each of the feeder meters transmit a uniquely identifiable signal through the feeder line. The DTMs then identifying the phase of each of the uniquely identifiable signals and then transmitting the phase of each of the uniquely identifiable signals to a data collector along with a unique DTM identifier. The connectivity relationship between the feeder meters and distribution transformer meters is then extrapolated by comparing the phase information transmitted by the DTMs.

Abstract: A system and device for measuring voltage in a conductor having a voltage provides a first electrode surrounding and spaced from the conductor, and a second electrode surrounding and spaced from both the conductor and the first electrode such that there is no contact between the conductor and the electrodes or between the first and second electrodes. The first electrode is connected to a first input of a differential amplifier circuit and the second electrode is connected to the other input of the differential amplifier circuit. The output of the differential amplifier circuit provides a voltage signal in proportion to the voltage of the conductor, thus providing a non-contact means for measuring the voltage of a conductor without requiring a connection to ground while simultaneously providing a high level of rejection of external interference.

Abstract: There is disclosed a method of monitoring an electrical network of the type having a feeder line connected to a plurality of distribution transformers, each distribution transformer being in turn coupled to a load which may be provided with a customer meter. The method includes the steps of recording an accumulated in-phase current at each of the distribution transformers over a time period and recording for the same time period an accumulated in-phase current at the feeder line. The sum of the accumulated in-phase currents recorded at the distribution transformers are then compared to the accumulated in-phase current recorded at the feeder line. The method may also include the steps of recording accumulated in-phase currents at the customer meters and comparing their sum with the accumulated in-phase current measured at the distribution transformers coupled to the customer meters.

Abstract: There is disclosed a method of detecting the configuration of a network having a feeder line with a plurality of feeder meters and distribution transformer meters (DTMs) coupled thereto and with one or more customer meters and/or customer configuration modules coupled to the distribution transformers. The method includes the steps of having each of the feeder meters transmit a uniquely identifiable signal through the feeder line. The DTMs then identifying the phase of each of the uniquely identifiable signals and then transmitting the phase of each of the uniquely identifiable signals to a data collector along with a unique DTM identifier. The connectivity relationship between the feeder meters and distribution transformer meters is then extrapolated by comparing the phase information transmitted by the DTMs.

Abstract: A time varying current sensor is constructed using surface coils uniformly spaced around a central cavity adapted to receive the conductor through which the current to be measured flows. Accurate and uniform coil geometry is achieved using printed circuit board technology, thereby eliminating the high cost of precision toroidal coil winding. An optional hinge in the housing can allow the sensor to be easily installed on existing conductors without the need to disconnect and reconnect.

Abstract: A bi-directional solid state switch has two main transistors which are connected to each other with input to input and input referenced output to input referenced output. Each unreferenced transistor output is separately connected to an output terminal of the switch. An electrical impedance is connected between the input connection and the input referenced output connection. A driver signal is connected across the input connection and one output terminal. This circuit topology is counter-intuitive, but provides advantages which can include eliminating the need for electrical isolation, being capable of turning on or off at any time, at or between zero crossings, having a high speed of response, simplicity, reliability, cost-effectiveness, and energy-efficiency.

Abstract: A time varying current sensor is constructed using surface coils uniformly spaced around a central cavity adapted to receive the conductor through which the current to be measured flows. Accurate and uniform coil geometry is achieved using printed circuit board technology, thereby eliminating the high cost of precision toroidal coil winding. An optional hinge in the housing can allow the sensor to be easily installed on existing conductors without the need to disconnect and reconnect.

Abstract: A bi-directional solid state switch has two main transistors which are connected to each other with input to input and input referenced output to input referenced output. Each unreferenced transistor output is separately connected to an output terminal of the switch. An electrical impedance is connected between the input connection and the input referenced output connection. A driver signal is connected across the input connection and one output terminal. This circuit topology is counter-intuitive, but provides advantages which can include eliminating the need for electrical isolation, being capable of turning on or off at any time, at or between zero crossings, having a high speed of response, simplicity, reliability, cost-effectiveness, and energy-efficiency.