Abstract:
In one embodiment, a network protector for a spot network includes a circuit breaker and a network protector relay coupled to the circuit breaker. The network protector relay is structured and configured to have network protector relay non-sensitive trip settings for controlling operation of the circuit breaker that will cause the network protector to remain closed when: (i) an angular difference (±) between a transformer phase-to-neutral voltage of the first feeder branch and a transformer phase-to-neutral voltage of the second feeder branch is less than or equal to a first threshold value, and (ii) a magnitude difference (±) between the transformer phase-to-neutral voltage of the feeder branch and the transformer phase-to-neutral voltage of the second feeder branch is less than or equal to a second threshold value.
Abstract:
Disclosed an electricity amount detection method and device, a terminal and a storage medium. The method includes that: Identity (ID) information of each function device called by an application is acquired according to ID information of the application; a power consumption parameter generated when each function device is called is correspondingly acquired according to the ID information of each function device called by the application; a power consumption parameter generated when the application is running is determined according to the power consumption parameter generated by each function device; and the power consumption parameter generated when the application is running is output as a power consumption index when the application is running.
Abstract:
A system and method are provided for measuring an integrated circuit age. A first clock generator is provided for generating a first clock signal and a second clock generator is provided for generating a second clock signal. Further, a phase detector in communication with the first clock generator and the second clock generator is provided for receiving the first clock signal from the first clock generator and the second clock signal from the second clock generator, and outputting a phase difference signal that is capable of being used as a measure of an integrated circuit age. Still yet, a circuit in communication with the phase detector and the first clock generator is provided for receiving the first clock signal from the first clock generator and the phase difference signal from the phase detector and for synchronizing the phase difference signal from the phase detector with the first clock signal from the first clock generator.
Abstract:
An electronic circuit is arranged in an external programming device and is used for contactless programming of a circuit to be programmed. The electronic circuit has a series resonant circuit that includes a transmitter coil and a capacitor. The transmitter coil of the series resonant circuit is used for inductive coupling to a receiver coil in the circuit to be programmed. For the purpose of evaluating the impedance that actually exists in the circuit to be programmed, there is provided a device for determining the value of the impedance from a phase difference between the control voltage of the series resonant circuit and the capacitor voltage of the series resonant circuit.
Abstract:
A system and method for detecting and localizing excess voltage drop in single or multiple phases of three-phase AC circuits is disclosed. An electrical distribution circuit is provided that includes an input connectable to an AC source, an output connectable to terminals of an electrical machine, the output configured to provide three-phase voltages and currents to the electrical machine, and a diagnostic system configured to detect an excess voltage drop (EVD) in the electrical distribution circuit. The diagnostic system includes a processor that is programmed to receive measurements of the three-phase voltages and currents provided to the electrical machine, compute a negative sequence voltage from the three-phase voltages and currents, determine a localization reference phase angle for each phase based in part on the three-phase voltages and currents, and calculate an EVD in the electrical distribution circuit based on the negative sequence voltage and the localization reference phase angles.
Abstract:
A circuit protection device is applied to a power supply module. The circuit protection device includes a judgment module and a control module. The judgment module includes a comparing unit, a feedback unit and a reset unit. The comparing unit has an output terminal, a first input terminal and a second input terminal. The feedback unit is electrically connected to the output terminal and the first input terminal. The reset unit is electrically connected to the feedback unit and the first input terminal. The control module is electrically connected to the comparing unit and the reset unit of the judgment module. The comparing unit receives a first reference signal representing the output current of the power supply module and a second reference signal representing the output voltage of the power supply module, and outputs a judgment signal to the control module.
Abstract:
A system having input terminals including line and neutral terminals for receiving AC power from a first AC source and having output terminals including output line and neutral terminals for receiving AC power from output terminals of a second AC source and for supplying AC power to a load, has a transfer switch configurable to connect the input terminals to the output terminals or to isolate the input terminals from the output terminals. When the transfer switch is configured to isolate the output terminals from the input terminals, the second AC source is caused to cease supplying power to the output terminals when a first voltage signal and an input current signal indicate the voltage and the input current satisfy a first set of criteria.
Abstract:
An electrical circuit for providing electrical energy to an electric motor which operates a liquid pump. The motor and the pump are adapted to be submerged in the liquid which is pumped by the pump. The circuit disclosed herein senses the phase angle between the current and the voltage applied to the electric motor. When the phase angle indicates that the motor is operating without a load, the circuit deenergizes the electric motor. Thus, the motor and the liquid pump are protected against damage. Recognizing that harmonics may exist in the current flow through the motor, the circuit provides for obtaining a filtered signal proportional to the fundamental frequency of the current flowing through the motor. Thus, an accurate measurement of the loading of a motor is obtained. The circuitry of this invention also provides an accurate method of compensation for applied line voltage variations, so that a change in the applied line voltage does not produce a false indication that the motor loading has changed.
Abstract:
A protective relay which hardly makes maloperation in itself regardless of mixing of low-order higher harmonics in its at least two sinusoidal input signals comprises a first and a second phase detection comparator generating two different-phase square signals indicative of the phase difference between the sinusoidal input signals, a first and a second timer receiving the square signals generated from the first and second phase detection comparators respectively and generating their output signals as a result of comparison between a first period of time and one of the periods or the period of presence or absence of the square signals, a third timer receiving the same square signal as that applied to the first timer and generating its output signal as a result of comparison between a second period of time and the other period or the period of absence or presence of the square signal, a fourth timer receiving the same square signal as that applied to the second timer and generating its output signal as a result of comparison between the second period of time and the other period or the period of absence or presence of the square signal, a first flip-flop set by the first timer and reset by the third timer, a second flip-flop set by the second timer and reset by the fourth timer, and a third flip-flop set and reset by an AND circuit and a NOR circuit respectively connected to the outputs of the first and second flip-flop.
Abstract:
A digital phase sequence detector which operates completely independent of signal amplitude values to provide an output signal having a logic level indicative of which of two phasors being compared is leading. The detector develops first and second feedback signals which determine the stable state of the circuit. This feedback arrangement enables the detector to be constructed of standard integrated circuits devoid of flip-flops or other memory elements requiring a clock. The level of the output signal of the detector persists for as long as the relationship being indicated persists, eliminating the need for pulse stretchers, timers, or the like.