1112results about "Parameter calibration/setting" patented technology

The disclosure concerns a method and an apparatus for adapting at least one set of parameters to at least one Intelligent Electronic Device (IED) of an electrical power network having a plurality of switching devices (CB). The method includes: a) reading the current network status of the electrical power network, wherein the network status includes the status of the plurality of switching devices; b) simulating at least one network fault in the electrical power network; c) deducing at least one new set of parameters for the at least one IED using a simulated fault current induced by the at least one simulated network fault under consideration of the present network status and the network topology of the electrical power network; and d) setting the at least one set of parameters in at least one of the at least one IED. The apparatus a) reads the current network status of the electrical power network, b) selects the at least one set of parameters for the at least one Intelligent Electronic Device out of a plurality of sets of parameters depending of the current network status; and c) sets the at least one set of parameters in the at least one IED.

An electrical power distribution system for connecting an electrical device to a source of electrical power and disconnecting the electrical device therefrom. The system includes a PCD tag associated with the electrical device, and a PCD reader associated with a receptacle electrically connectable to the source of electrical power. The PCD tag has a PCD tag memory in which data related to the electrical device is stored in a format readable by the PCD reader, the data including an electrical device load rating. The system also has a switch device for connecting and disconnecting the receptacle to the power source. In addition, the system has a measuring device for measuring actual load and a control circuit for comparing actual load to the electrical device load rating. The control circuit provides a disconnect signal to the switch device upon the actual load exceeding the electrical device load rating.

A method and system for monitoring and controlling a power distribution system is provided. The system includes a plurality of circuit breakers and a plurality of node electronic units. Each node electronic unit is mounted remotely from an associated circuit breaker that is electrically coupled with one of the node electronic units. The system also includes a first digital network, and a first central control unit. The first central control unit and the plurality of node electronic units are communicatively coupled to the first digital network. The method includes receiving digital signals from each node electronic unit at the central control unit, determining an operational state of the power distribution system from the digital signal, and transmitting digital signals to the plurality of node electronic units such that the circuit breakers are operable from the first central control unit.

A configurable overload relay selectively operable in a single-phase mode of operation and a multi-phase mode of operation is configured to sense current flow through power conductors. The relay is further configured to determine a parameter related to the current flow, such as average current, vector sum of phase currents, and current imbalance, based on selection of either the single-phase or multi-phase mode of operation. Regardless of the selected mode of operation, the relay can provide protection for multiple types of power conductor fault conditions, including ground faults, overloads, and phase loss. The relay further can be configured to provide a reporting signal indicative of the value of the determined current-related parameter and / or the occurrence of the fault condition.

A circuit interrupter having an integrated variable timer circuit for alerting an end-user of an impending test of the circuit interrupter which expands the function of a basic circuit interrupter by adding visual / audible warning indicators and the capability of the circuit interrupter to test itself is described herein. The integrated variable timer circuit includes a variable resistor where the user can adjust the current flowing to a capacitor. The variable resistor enables the ability for the user to adjust the predetermined testing time. When the charge across the capacitor surpasses the voltage of a parallel, connected Zener diode, a transistor turns on a self-test subcircuit or visual / audible warning indicator. A switch across capacitor is used to discharge the capacitor and to reset the timer. A switch is included to enable a manual trip after the self test has completed.

A DC and / or an AC power transmission circuit protection system is for protection of a cabling medium. The circuit protection system includes a power supply, a powered device and a circuit protection module that includes an over-current and / or over-voltage circuit module and / or a heat circuit protector. The protection system is disposed between the power supply and the powered device, and interrupts an electrical current that flows through the cabling medium when the over-current and / or over-voltage circuit module and / or the circuit protector exceeds a predetermined level. There is also provided a method to dispose the circuit protection system and the circuit protection module within the circuit and to interrupt the circuit when over-current and / or over-voltage circuit module and / or heat circuit protector exceeds a predetermined level.

An electrical power distribution system is disclosed that includes a gateway module (100) including logic (112) to interface to a vehicle management computer (VMC) (50) via a dual redundant standard data bus (1). The gateway module (100) has redundant microcontrollers (114, 116) operably connected to the VMC (50) for selectively controlling supply of electrical power to a plurality of separate electrical loads (120). A plurality of Load Management Modules (300) is provided. Each Load Management Module (300) includes a local microcontroller (310); power switching devices (320); and application specific integrated circuits ASICs (330) for interfacing the power switching devices (320) to the local microcontroller (310). Each ASIC (330) can be connected to a corresponding digital potentiometer (600) that is used to program an over current protection characteristic. Additionally, each ASIC (330) can include a voltage to frequency converter (381) that provides a true RMS current value to the local microcontroller (310).

Maintenance trip functions override the normal or specified trip functions of a low voltage circuit breaker to reduce pickup currents and / or time delays to effect faster trips, which reduces arc energy produced by faults during maintenance or testing on a live circuit breaker.

An automatic configuration tool for use with power protection and restoration devices such as reclosers and switches in power transmission and distribution systems. An automatic configuration application provides a plurality of menus to a user on a graphical user interface to enable the user to select a plurality of options that are processed by various calculation engines to determine the configuration settings for a specific power protection and restoration device. The configuration settings that are generated are downloaded directly into the power protection and restoration device to provide protection, control and monitoring.

An electrical power distribution system for connecting an electrical device to a source of electrical power and disconnecting the electrical device therefrom. The system includes a PCD tag associated with the electrical device, and a PCD reader associated with a receptacle electrically connectable to the source of electrical power. The PCD tag has a PCD tag memory in which data related to the electrical device is stored in a format readable by the PCD reader, the data including an electrical device load rating. The system also has a switch device for connecting and disconnecting the receptacle to the power source. In addition, the system has a measuring device for measuring actual load and a control circuit for comparing actual load to the electrical device load rating. The control circuit provides a disconnect signal to the switch device upon the actual load exceeding the electrical device load rating.

A circuit breaker includes current detectors, a microprocessor-controlled tripping device, and a bypass circuit that interacts with a watchdog circuit that monitors the proper functioning of the microprocessor. A switchable reference voltage is made available to the bypass circuit as a function of the momentary supply voltage. During short circuits, the bypass circuit, immediately upon being switched on, responds to very high limit current values, whereas after the switch-on phase, it already responds at moderately high limit current values.

A method and system for a power distribution system are provided. The method includes determining at a central controller normal mode configuration settings for a plurality of circuit breakers of the power distribution system and determining at the central controller alternate mode configuration settings for the plurality of circuit breakers of the power distribution system. The method further includes controlling with the central controller the operation of the plurality of circuit breakers based on the normal mode configuration settings and the alternate mode configuration settings.

Systems and methods for providing overcurrent circuit protection are disclosed. A method of providing overcurrent circuit protection may include setting a threshold current value according to an operational state of a motor and sensing an amount of current being supplied to the motor. The method may further include electrically isolating the motor from a current source if the sensed current amount is greater than the threshold current value.