6results about How to "High protection sensitivity" patented technology

According to the invention, the internal association relationship between the fault working condition attribute and the fault feature is mined, and the fault information fusion-based power system transient protection method is provided. The fault information fusion method adopts a Kalman filtering algorithm and an improved Kalman filtering algorithm, or adopts a particle filtering algorithm or an improved particle filtering algorithm. And the fault can be reflected more accurately by fusing the standard fault characteristics of the fault working condition attributes. According to the power system transient protection method based on the fault working condition attribute, the adverse effect of the fault initial phase angle and the transition resistance on protection is overcome, and the transient protection reliability is improved.

A distribution network intelligent switch device, the device includes an electronic transformer measurement unit, a protection control unit, a circuit breaker, and an intelligent terminal; the electronic transformer measurement unit is connected to the protection control unit, the protection control unit is connected to the circuit breaker, and the protection control unit is wirelessly connected to the intelligent terminal. The device also includes an online energy acquisition unit, the online energy acquisition unit is respectively connected to the electronic transformer measurement unit and the protection control unit, and the online energy acquisition unit is used to obtain energy from the distribution line. The invention provides a distribution network intelligent switch device, which can effectively reduce the size and weight of the equipment, improve the intelligence level of the switch, simplify the operation process, and realize real-time and accurate monitoring of the distribution network status and fault judgment.

The application discloses a kind of alarm shutdown devices of bucket lifting skin bucket off, it is related to material conveying equipment technical field, including hoist body, the hoist body includes base shell, the upper surface of the base shell is fixedly provided with vertical support shell, the top of the vertical support shell is fixedly provided with top cover shell, drive shaft rod and driven shaft rod are respectively rotationally arranged between the front and rear inner walls of the base shell and top cover shell.The application is provided with alarm monitoring mechanism outside the hoist, adopts inductive proximity switch non-contact detection hopper running track, and the interval and on-off state of real-time determination signal are cooperated with the built-in timer of control unit, can identify abnormality in the first time of hopper off, conveying belt slip, off, when fault occurs, control unit triggers sound-light alarm and driving motor power-off simultaneously, quickly prevent equipment from continuing to operate, avoid hopper off impact shell, conveying belt tear and other accidents, greatly improve equipment operation safety.

The invention relates to the technical field of power utilization protection of a nuclear power plant, and provides a grounding protection method and system for supplying power by multiple paths of power supplies with different grounding modes. A resistance grounding mode is adopted for a main transformer of a power supply outside a plant and a low-voltage side neutral point of a self-contained generator in the plant, so that fault current flowing through a fault point not only comprises capacitance current, but also comprises capacitance current; the system further comprises a grounding resistance current, so that a grounding fault can be easily detected through the zero sequence current transformer, and a specific loop where the grounding fault is located can be more easily judged. After a grounding fault occurs, the grounding resistor is switched off through the neutral point grounding resistor switch, so that the magnitude of grounding fault current can be quickly reduced, and the impact of the current on system equipment is reduced. The grounding resistor provides a current limiting function at the initial stage of a fault, and after the grounding resistor is disconnected, channels for fault current to flow are further reduced, so that the fault influence is reduced to the minimum.

The present invention provides an adaptive fault ride-through operation control method and related devices for an inverter-type distributed power supply. According to the inverter-type distributed power supply fault ride-through requirements and the grid-connected inverter current limit value, the voltage of the grid connection point when the output current of the inverter-type distributed power supply reaches the maximum allowable value, that is, the boundary voltage, is calculated, and the corresponding fault ride-through control strategy is selected according to the magnitude relationship between the grid connection point voltage and the boundary voltage. The present invention enables the inverter-type distributed power supply to always output the maximum allowable output current during the fault ride-through period, and adaptively adjusts the distribution of active current and reactive current according to the grid connection point voltage. On the one hand, it can increase the fault current output by the inverter-type distributed power supply when a minor fault occurs in the system, thereby improving the protection sensitivity; on the other hand, it can improve the ability of the inverter-type distributed power supply to output reactive power, raise the grid connection point voltage of the inverter-type distributed power supply, and enhance the fault ride-through capability of the inverter-type distributed power supply.

The application discloses a new energy box-type substation self-adaptive over-current protection setting method, and relates to the technical field of relay protection of power systems, and the method comprises the steps of establishing a multi-channel communication link with each new energy converter; collecting the running state and real-time apparent power through each communication interface polling; summarizing the total real-time apparent power and correcting the line loss; and generating the over-current protection setting value according to the corrected total real-time apparent power and the measured apparent power on the low-voltage side. The technical scheme of the application combines multi-channel collection, power summarization and correction, and self-adaptive setting, so that the protection threshold dynamically matches the actual output, the fault protection sensitivity under the low-output working condition is significantly improved, the over-current protection response capability and action reliability are improved, and the safe and stable operation of the transformer is ensured.