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459results about How to "Reduce malfunction" patented technology

Substation area differential protection method for intelligent substation

The invention discloses a substation area differential protection method for an intelligent substation, which comprises a big differential protection mode taking the substation as the principal thing, and more than two small differential protection modes taking the substations as the principal things; the big differential protection mode serves as a starting element, any one small differential protection mode serves as an action element; when the two conditions are satisfied simultaneously, the differential protection outputs action; the small differential protection modes are still failure selecting elements; the range of the big differential protection mode is delimitated by high voltage side current of each transformer and all outlet current on the medium voltage side generating line and the low voltage side generating line, of the substation, (not comprising buscouple and segment); the ranges of the small differential protection modes are delimitated by corresponding high voltage side current of the transformer, and all corresponding outlet current on the generating lines connected with main change medium voltage side and low voltage side, (not comprising buscouple and segment). The method not only can thoroughly protect the substation, but also can close the failure transformer in a targeted manner, is small in influence range for the electricity using user, and is particularly suitable for the substation provided with two or more than two transformers to use.
Owner:STATE GRID SHANDONG ELECTRIC POWER COMPANY WEIFANG POWER SUPPLY +2

Relaying protection equipment setting method and device

The invention discloses a relaying protection equipment setting method and device. The method comprises the steps of obtaining real-time data of a power grid from an EMS, obtaining the connection relation and the leader-member relation of power elements in the power grid, obtaining a corresponding equivalent circuit, setting a fault model for a subordinate circuit, determining a subordinate fault circuit, calculating the ratio between first short-circuit current corresponding to a superior circuit and second short-circuit current corresponding to the subordinate fault circuit according to the real-time data of the power grid, regarding the ratio as a branch coefficient of the power grid, obtaining a target relaying protection setting value and updating corresponding relaying protection equipment according to the target relaying protection setting value. The branch coefficient is calculated through real-time data of the power grid. The data of the power grid have the real-time performance and are not affected by changes of the operating mode of a power source, so that the accuracy of the relaying protection setting value obtained by calculation of the branch coefficient is ensured, false operations of a protection device are reduced, and the stability of a power grid system is enhanced.
Owner:POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD +1

Relay protection method of transformer as well as system thereof

The invention provides a relay protection method of a transformer as well as a system thereof. The invention adopts standardized protection equipment based on the IEC (International Electrotechnical Commission) 61850, realizes the on-site digitalization of the acquisition of analog quantities at the high voltage side and the low voltage side of the transformer and realizes the transmission of a detection signal and a control instruction by using a message of an IEC 61850 communication protocol so as to reduce errors or interference of the detection signal and the control instruction in a transmission process, improve the accuracy of relay protection action and benefit the safe and stable operation of the transformer. The relay protection method of the transformer and the system thereof in the invention reduce controller malfunctions caused by heavier secondary load of a current transformer, which is brought by transmitting an analog detection signal by the long-distance cable because of the longer distance between main equipment and protection equipment in a nuclear power station, and also solve the problem of incorrect trip caused by large grounding distributed capacitance and easy interference of a cable for the long-distance transmission of a trip instruction in case of longer distance between a beaker of nuclear power station main equipment and a controller.
Owner:CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD

Intelligent household electrical appliance control device, method and system

The present invention provides an intelligent household electrical appliance control device, method and system. The intelligent household electrical appliance control device comprises a voice recognition module, an action module and at least one distance recognition module; the at least one distance recognition module is used for detecting whether a trigger object exists in a preset recognition range; the voice recognition module is used for recognizing received first voice information after the at least one distance recognition module detects that a trigger object exists in the recognition range, and judging whether the first voice information is a preset voice instruction; and the action module is used for executing an action of an intelligent household electrical appliance after the voice recognition module judges that the first voice information is a voice instruction, wherein the action of the intelligent household electrical appliance is corresponding to the voice instruction. With the intelligent household electrical appliance control device, method and system provided by the technical schemes of the invention adopted, the probability of the malfunction of the intelligent household electrical appliance can be decreased.
Owner:合肥美菱物联科技有限公司

DC offset cancellation circuit, differential amplification circuit with DC offset cancellation circuit, photo-electric pulse conversion circuit, pulse shaping circuit, and pulse generation circuit

A DC offset cancellation circuit that is capable of canceling a DC offset voltage occurring between a pair of differential output signals of a differential amplification circuit, while preventing a signal waveform from being distorted due to accumulation of AC components and a photo-electric pulse conversion circuit that is capable of generating an electrical pulse signal that accurately reproduces a rise timing and a fall timing of an optical pulse signal by canceling the DC offset voltage are provided. A photo-electric pulse conversion circuit is provided with a photodiode, an I-V conversion circuit, a first differential amplification circuit having a DC offset cancellation circuit, a second differential amplification circuit, a reference voltage generation circuit, and a comparison circuit. The DC offset cancellation circuit uses a changeover circuit to change a state of a low-pass filter with a hold function in synchronization with an inversion electrical pulse signal, and performs a negative feedback of a filtered signal which is generated by subjecting third differential signals to low-pass filtration or a hold filtered signal which is a filtered signal held during changeover.
Owner:FUJITSU MICROELECTRONICS LTD

Serial connection fault arc detection circuit

The invention discloses a serial connection fault arc detection circuit. The serial connection fault arc detection circuit comprises a current sampling circuit (1), a noise suppression and amplification circuit (2), a rectifying circuit (3), a comparison circuit (4) and a control circuit (5), wherein the current sampling circuit (1) is arranged on a live wire of a detected line, and is used for outputting a current detection signal representing the current high frequency component of the live wire; the noise suppression and amplification circuit (2) is used for denoising and amplifying the current detection signal to obtain an alternating current high frequency signal; the rectifying circuit (3) is used for converting the alternating current high frequency signal into a direct current high frequency signal; the comparison circuit (4) is used for comparing the amplitude of the direct current high frequency signal with a preset voltage threshold so as to output a fault arc alert signal; and the control circuit (5) is used for outputting a protection signal according to the fault arc alert signal. The serial connection fault arc detection circuit can improve the accuracy for serial connection fault arc detection, and can reduce the mis-operation and refusal to operation situation for a protection device so as to improve the reliability of a fault arc protection device and realize stable working remotely or in the environment with serious electromagnetic interference.
Owner:GREE ELECTRIC APPLIANCES INC
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