Abstract: A capacitive voltage sensor assembly includes a first electrode extending along a longitudinal axis, a second electrode surrounding a portion of the first electrode and positioned radially outward from the longitudinal axis and the first electrode, the second electrode including a flexible tubular portion, and a mass of dielectric insulating material at least partially encapsulating the first electrode and the second electrode. The flexible tubular portion is configured to move during solidification of the mass of dielectric resin, and the mass of dielectric resin fills through openings formed in the second electrode and forms a unitary insulating carrier structure for the first electrode and the second electrode.

Abstract: Systems and methods for calibrating a low-power voltage transformer (LPVT). Systems include a capacitive voltage divider and a variable capacitance device connected to the capacitive voltage divider. A parameter of the variable capacitance device is adjusted to minimize the ratio error of the LPVT. Methods include connecting a variable capacitance device to a capacitive voltage divider of the LPVT system, measuring a ratio error of the LPVT system based on an output of the variable capacitance device, and adjusting a parameter of the variable capacitance device.

Abstract: A switchgear assembly includes an indicator assembly to indicate whether a movable contact is in an open or a closed position. The indicator assembly includes an indicator body having first and second sections. The indicator body is rotatable to display the first section in the open position and the second section in the closed position. The indicator assembly also includes a drive gear having a first helical spline and coupled to an actuator of the switchgear assembly such that operation of the actuator moves the drive gear, and an elongated driven gear having a second helical spline extending along a length of the driven gear and engaged with the first helical spline of the drive gear such that movement of the drive gear rotates the driven gear. The driven gear is coupled to the indicator body such that rotation of the driven gear causes rotation of the indicator body.

Abstract: A sensor assembly includes a connecting bar extending along a longitudinal axis and a tubular body extending along the longitudinal axis and at least partially surrounding the connecting bar such that the tubular body is radially spaced from the connecting bar. The tubular body includes a first skirt portion, a first plurality of cantilevered tabs extending from the first skirt portion in a first direction parallel to the longitudinal axis, a second skirt portion, and a second plurality of cantilevered tabs extending from the second skirt portion in a second direction opposite the first direction.

Abstract: A capacitive voltage sensor assembly includes an electrode extending along a longitudinal axis, the electrode having a first end and a second end opposite the first end, and a tubular shield surrounding and spaced radially outward from a portion of the electrode. The tubular shield includes a plurality of through holes. The sensor assembly also includes a circular sensor element positioned radially inward of the tubular shield and including a first layer made of electrically conductive material and a second layer made of electrically insulating material. The circular sensor element includes a plurality of circumferentially spaced gaps.

Abstract: A sensor assembly includes a connecting bar extending along a longitudinal axis and a tubular body extending along the longitudinal axis and at least partially surrounding the connecting bar such that the tubular body is radially spaced from the connecting bar. The tubular body includes a support member made of insulating material. The tubular body also includes a first section with an electric field sensor comprising a first layer of electrically conductive material on an inner surface of the support member to detect an electric field produced by the connecting bar. The first section also includes a first electric screen comprising a second layer of electrically conductive material on an outer surface of the support member to shield the electric field sensor from outside electrical interference. A second section disposed adjacent the first section includes a second electric screen. A dielectric material at least partially encloses the tubular body.

Abstract: A method for controlling a power distribution network includes receiving, via an electronic processor, a fault indication associated with a fault from a first isolation device of a plurality of isolation devices. The processor identifies a first subset of a plurality of phases associated with the fault indication and a second subset not associated with the fault indication. The processor sends a first open command to each member of a set of downstream isolation devices for each phase in the first subset. The processor identifies a plurality of tie-in isolation devices to be closed to restore power. Responsive to identifying a first potential loop configuration, for each of the plurality of tie-in devices, the processor sends a close command to the tie-in isolation device for each of the plurality of phases and sends a second open command to the associated downstream isolation device for each phase in the second subset.

Abstract: A method of calibrating a recloser voltage measurement system. In one example, the recloser voltage measurement system includes a voltage divider and a voltage adjustment circuit. The voltage divider is electrically coupled to a recloser. The voltage adjustment circuit is electrically coupled to an output of the voltage divider. The method includes determining a first voltage measurement at a high voltage input to the recloser. The method also includes determining a second voltage measurement at an output of the voltage adjustment circuit. The method further includes calculating a difference between the first voltage measurement and the second voltage measurement. The method also includes determining a target voltage gain based on the determined difference between the first voltage measurement and the second voltage measurement. The method further includes adjusting a voltage ratio of the voltage divider by setting the voltage adjustment circuit to the target voltage gain.

Abstract: Techniques for controlling a power distribution network are provided. An electronic processor receives, a fault indication associated with a fault from a first isolation device of a plurality of isolation devices. The processor identifies a first subset of a plurality of phases associated with the fault indication and a second subset of the plurality of phases not associated with the fault indication. The processor identifies a downstream isolation device downstream of the fault. The processor sends send a first open command to the downstream isolation device for each phase in the first subset. The processor sends a close command to a tie-in isolation device for each of the plurality of phases. The processor sends a second open command to the downstream isolation device for each phase in the second subset. Responsive to identifying a potential loop configuration, the processor sends the second open command prior to the close command.

Abstract: A processor receives an indication of a fault from a first isolation device. The processor sends a first open command to a downstream isolation device downstream of the fault, identifies a tie-in isolation device, and identifies a line section without current monitoring positioned between the tie-in isolation device and the downstream isolation device. The line section has a plurality of line segments, each having a load rating. The processor receives incoming and exiting current measurements for the line section and estimates a first current load for each of the line segments in the line section based on the incoming and exiting current measurements and the load ratings. The processor selects an intermediate isolation device between the tie-in isolation device and the downstream isolation device based on the first current loads, sends a second open command to the intermediate isolation device, and sends a close command to the tie-in isolation device.

Abstract: A capacitive voltage sensor assembly includes a first electrode extending along a longitudinal axis, the first electrode including a first end and a second end opposite the first end, a second electrode surrounding the second end of the first electrode, the second electrode including a tubular portion having a first end and a second end opposite the first end, and a base portion coupled to the first end of the tubular portion, and a mass of dielectric insulating material at least partially encapsulating the first electrode and the second electrode. The tubular portion includes a plurality of cantilevered tabs interconnected at the first end of the second electrode. Each tab of the plurality of cantilevered tabs is circumferentially separated from an adjacent tab of the plurality of cantilevered tabs to define a gap therebetween at the second end of the second electrode.

Abstract: Voltage measurement calibration methods and junction circuits. In one embodiment, the junction circuit includes a capacitor and a voltage adjustment circuit. The junction circuit is electrically coupled to an output of a capacitive voltage divider circuit. The capacitor is electrically coupled between the output of the capacitive voltage divider circuit and a reference terminal. The voltage adjustment circuit is electrically coupled between the output of the capacitive voltage divider circuit and an output of the junction circuit. The voltage adjustment circuit includes an adjustable impedance component configured to adjust a voltage gain of the voltage adjustment circuit.

Abstract: A sensor assembly includes a connecting bar extending along a longitudinal axis and a tubular body extending along the longitudinal axis and at least partially surrounding the connecting bar such that the tubular body is radially spaced from the connecting bar. The tubular body includes a first skirt portion, a first plurality of cantilevered tabs extending from the first skirt portion in a first direction parallel to the longitudinal axis, a second skirt portion, and a second plurality of cantilevered tabs extending from the second skirt portion in a second direction opposite the first direction.

Abstract: A sensor assembly includes a connecting bar extending along a longitudinal axis and a tubular body extending along the longitudinal axis and at least partially surrounding the connecting bar such that the tubular body is radially spaced from the connecting bar. The tubular body includes a support member made of insulating material. The tubular body also includes a first section with an electric field sensor comprising a first layer of electrically conductive material on an inner surface of the support member to detect an electric field produced by the connecting bar. The first section also includes a first electric screen comprising a second layer of electrically conductive material on an outer surface of the support member to shield the electric field sensor from outside electrical interference. A second section disposed adjacent the first section includes a second electric screen. A dielectric material at least partially encloses the tubular body.

Abstract: A method for controlling a power distribution network includes receiving, by an electronic processor, a fault indication associated with a fault in the power distribution network from a first isolation device of a plurality of isolation devices. The processor identifies a first subset of a plurality of phases associated with the fault indication and a second subset of the plurality of phases not associated with the fault indication. The first and second subsets each include at least one member. The processor identifies an upstream isolation device upstream of the fault. The processor identifies a downstream isolation device downstream of the fault. The processor sends an open command to the downstream isolation device for each phase in the first subset. Responsive to the first isolation device not being the upstream isolation device, the processor sends a close command to the first isolation device for each phase in the first subset.

Abstract: A construction system regarding a capacitive voltage sensor, comprises a source electrode (110/210/310/410), a tubular body (120/220/320/420), and a mass of dielectric insulating material (140/240/340/440).

Abstract: A system for controlling a power distribution network providing power using a plurality of phases comprises an electronic processor and memory storing instructions that, when executed by the electronic processor, cause the system to receive a loss of voltage fault indication associated with a fault in the power distribution network. The electronic processor identifies a first subset of the plurality of phases associated with the loss of voltage fault indication and a second subset of the plurality of phases not associated with the loss of voltage fault indication. The first and second subsets each include at least one member. The electronic processor identifies a downstream isolation device downstream of the fault. The electronic processor sends an open command to the downstream isolation device for each phase in the first subset. The electronic processor sends a close command to a tie-in isolation device downstream of the downstream isolation device.

Abstract: A method for controlling a power distribution network includes receiving, by an electronic processor, a fault indication associated with a fault in the power distribution network from a first isolation device of a plurality of isolation devices. The processor identifies a first subset of a plurality of phases associated with the fault indication and a second subset of the plurality of phases not associated with the fault indication. The first and second subsets each include at least one member. The processor identifies an upstream isolation device upstream of the fault. The processor identifies a downstream isolation device downstream of the fault. The processor sends an open command to the downstream isolation device for each phase in the first subset. Responsive to the first isolation device not being the upstream isolation device, the processor sends a close command to the first isolation device for each phase in the first subset.

Abstract: Systems and methods for measuring low energy voltage in a high energy transmission line electrode divider network. A floating reference voltage screen is positioned between a high energy transmission line electrode and a ground plate at a distance from the high energy transmission line electrode that is shorter than a distance between the ground plate and the floating reference voltage screen. A first conductive lead electrically couples the high energy analog transmission line electrode to a first input of a voltmeter that is connected to a controller. A second conductive lead electrically couples the floating reference voltage screen to a second input of the voltmeter. An alternating voltage drop is measured across the high energy transmission line electrode and the floating reference voltage screen by electronics of the voltmeter connected to the controller. The controller and the voltmeter are both disconnected from the ground plate.

Abstract: A constructive system regarding a capacitance electric voltage sensor comprises a source electrode (110, 210), a shielding tubular body (120, 220), an electric field sensor (130, 230) and a mass of dielectric insulating material (140, 240). The electric field sensor (130, 230) comprises at least one first inner sheet (131, 231) and a second outer sheet (132, 232) superimposed and joined together, wherein said first inner sheet (131, 231) is made by means of a conductive metal material, wherein said second outer sheet (132, 232) is made by means of an electrically insulating material, and wherein said second outer sheet (132, 232) made of insulating material is constrained with respect to the inner face (124, 224) of the shielding tubular element (120, 220).