31results about How to "Does not affect the protection function" patented technology

The invention provides an electric leakage detection protector, which comprises a first fault detection part and a circuit interruption part. The first fault detection part comprises a first current conduction part and a sampling control circuit, wherein on end of the first current conduction part is connected with a phase line while the other end is connected with a voltage sampling point on a ground wire so that a loaded electric connection is established between the phase line and the voltage sampling point; and one end of the sampling control circuit is connected with the voltage samplingpoint, and a control electric signal is generated when the voltage of the voltage sampling point exceeds a first scheduled threshold voltage. The circuit interruption part is used for interrupting theelectric connections on the phase line and a zero line under the control of the control electric signal. The electric leakage detection protector can detect whether the ground wire is connected normally and whether the phase line and the zero line are connected reversely, and the electric leakage detection protector can also comprise a residual current protective circuit to further detect the current unbalance on a live wire and the zero line.

The invention provides a motor overvoltage protection circuit, undervoltage protection circuit, voltage protection circuit and a motor. The motor overvoltage protection circuit comprises a first controllable switch of which the control end receives a bus voltage acquisition signal of the motor and the first end is grounded; and a second controllable switch of which the control end is connected with the second end of the first controllable switch, the first end is grounded and the second end is connected with the fault detection end of the driving chip of the motor. The overvoltage protection of the motor is realized by the motor overvoltage protection circuit. The motor overvoltage protection circuit has the characteristics of simple circuit structure, low cost and wide application range.The overvoltage protection is realized by utilizing the inherent protection function of the driving chip without occupying the existing working circuit port so that the requirements of the overvoltageprotection function on the chip resources can be reduced without influencing the existing protection function of the circuit.

The invention provides a method for automatically resetting the grounding protection device of a small-current system, which has the function of automatically resetting. The method comprises the following steps: an intelligent controller of a microcomputer judges whether the small-current system is grounded and further judges the grounding phase if the system is grounded; when the system is subjected to a grounding fault, a switching-on instruction is given to a fault-phase circuit breaker, and the fault-phase circuit breaker is rapidly switched on; the fault phase is connected with a grounding grid via a low-impedance current-limiting reactor provided with a secondary coil; then, a system grounding current flowing through the primary coil of the low-impedance current-limiting reactor is detected by a zero-sequence current transformer, and a high-frequency voltage signal generator connected with the secondary coil of the low-impedance current-limiting reactor is put into operation, soa high-frequency voltage and a high-frequency current are injected into the fault phase of the system; the high-frequency impedance of the fault phase of the system can be calculated by the intelligent controller of the microcomputer, so as to obtain the grounding resistance of the faulted return circuit; and the grounding resistance thereof is further compared with that in the normal system to judge whether the grounding fault disappears, if so, an automatic resetting instruction is given, so as to switch off the fault-phase circuit breaker, thereby automatically resetting the device.

The invention discloses a wind turbine multi-mode self-adaptive control method, device and computer storage medium. The steps of the method include: S1. Constructing a digital prototype model of the wind turbine; S2. Collecting the operating state data of the controlled wind turbine in real time; S3. Input the collected operating state data into the digital prototype model for comparison, and judge whether the controlled wind turbine is in normal operating state, if not, go to step S4; S4. Determine the control mode according to the comparison result to control the controlled wind turbine. The wind turbine is adjusted to a normal operating state; the device includes a prototype model building module, a data acquisition module, a state discrimination module and a multi-mode adaptive control module. The invention can realize the multi-mode self-adaptive control of the wind turbine, improve the reliability and stability of the operation of the wind turbine, and has the advantages of simple implementation method, low cost, high control efficiency and precision, and the like.

The present invention is anti-locking control method and system for magnetic suspension train, and on the basis of traditional magnetic suspension control device, one anti-locking control device comprising one predicting controller, one logic processing unit, one power tube state detector, etc is set. The predicting controller predicts the dynamic suspension gap on the running magnetic suspension train based on the signal from the displacement sensor of the suspension control device and sends command to the suspension control device according to the prediction result. Normally, the magnet current is real-time regulated for the magnet to keep certain suspension interval to the track; and in case predicted locking risk, the anti-locking control device requires the suspension control device to feed inverse current to the magnet so as to avoid locking the train onto the track.

Provided is a method for extracting an explosion-continuous short circuit signal. The method is characterized by utilizing the features of an instantaneous positive and negative pulse current which is produced at an explosion point during short circuiting, and thus extraction of the explosion point signal is realized; and combining a leakage protector to control short-circuit burning. Therefore, the short-circuit burning, which is caused for the reason that a short-circuit current is not large enough to enable an air short-circuit switch to trip, is performed an automatic circuit-breaking control, and electric fire cases can be reduced; the original leakage protector is combined, so that circuit control is simple and the cost is low; and thus the method is an ingeniously-designed, highly-practical anti-electric fire technical scheme.

The invention discloses a side position operation gear for a beaker, which includes a casing, as well as a rotary body, a beaker rotary control shaft, and a rotary body driving mechanism, wherein the rotary body is arranged on the casing in a rotating manner; the rotary body driving mechanism is linked with the rotary body in a rotating and driving manner; the rotary body is in transmission fit with the breaker rotary control shaft through a clutch in a separation and union manner; the outer end of the breaker rotary control shaft penetrates through the casing from the side part of the casing. The side position operation gear has the advantages that under the premise that the normal tripping operation of the breaker is not influenced, the side position control of the breaker is realized, under the signal control of a prepayment carrier wave electric energy meter, the full automatic control of no-fee tripping and renewing switching is realized.

The invention discloses a cell phone back cover used for wireless power charging, which comprises a back cover main body. The back cover main body comprises a tempered glass layer and an ink layer that are laminated wherein the ink layer is located at the inner side of the tempered glass layer, the ink layer is provided with hollow patterns to enable the tempered glass layer to form wireless penetration windows, and the four corners at the inner side of the back cover main body are further provided with L-shaped corner protection gaskets. According to the invention, through the use of the composed structure of the tempered glass layer and the ink layer as the back cover of a cell phone, the protection function for the cell phone is not compromised on one hand, and due to the utilization of the high penetration performance of the tempered glass layer to make wireless power penetrate well for the convenient wireless power charging of the cell phone on the other hand. Then, the corner protection gaskets increase the anti-breakage performance of the back cover as well.

The invention relates to an intelligent body protection device and a protection method thereof. Due to the adoption of the intelligent body protection device and the method thereof, the reliability and the rapidness of the tripping operation are improved. The intelligent body protection device comprises a CPU (central processing unit) and a relay. One path of non-electricity protection signal outputs a tripping signal TZ by utilizing the relay; the other path of non-electricity protection signal is sent to the CPU and the CPU sends a signal record XH; the CPU is also additionally provided with two paths of inputs; one path of input is a DGA (Dissolved Gas Analysis) control word determined by a user; the other path of input is DGA information; the DGA information comprises early warning information sent out by a DGA unit and information of various component gases dissolved in transformer oil; the DGA information is sent out by a GOOSE (Generic Object Oriented Substation Event) / MMS (Multimedia Messaging Service) form; after the DGA information is judged by the CPU, a tripping signal TZ1 and a signal record XH1 are output; and the tripping signals TZ and TZ1 are connected in parallel to a tripping circuit and are both used for realizing tripping of a transformer. In the scheme, DGA (Dissolved Gas Analysis) on-line monitoring information is introduced to improve the reliability and the rapidness of protection of a transformer body and the intelligent body protection device and the protection method thereof are convenient to analyze the condition of the body protection operation later.

The invention discloses a method and device for multi-mode control and protection of a transmission chain of a wind turbine. The steps of the method include: S1. Acquiring the operation data of a target wind turbine, and identifying each designated frequency of the transmission chain according to the operation data as a key monitoring frequency; S2 .Control the operation of the target wind turbine according to multiple preset control modes, and monitor the state of the transmission chain during the operation of the target wind turbine, and judge whether the specified operation index exceeds the normal range at the key monitoring frequency. If it is controlled within multiple presets The control mode is switched to adjust the corresponding operation index; the device includes a frequency identification module and a multi-mode control module. The invention has the advantages of simple implementation method, low cost, multi-mode automatic control and protection of the transmission chain of the wind power generating set, high protection control precision, good protection performance, fast response speed and the like.

The invention provides a high-precision sampling method for a low-voltage circuit breaker, and the method comprises the following steps: S1, carrying out the voltage reduction of a three-phase voltage signal inputted by the circuit breaker through a resistor voltage dividing mode, and transmitting the signal to a metering chip; s2, converting the three-phase current signal through a special metering transformer, and transmitting the converted three-phase current signal to a metering chip through a filter circuit; s3, the metering chip carries out internal calculation according to the collected three-phase voltage and current signals to obtain original data; according to the invention, high-precision power grid parameter measurement can be completed on the premise that the protection function is not affected.

The invention discloses a method and device for diagnosing dislocation of blades of a wind turbine. The steps of the method include: S1. Acquire acceleration data of a target wind turbine running within a specified period of time, perform statistics on the acquired acceleration data, and preliminarily determine whether or not according to the statistical results. A dislocation fault may occur, if it is, go to step S2; S2. Obtain the operating parameters of the wind turbine including the acceleration data within the specified time period for frequency domain analysis, and finally confirm whether the target wind turbine has a dislocation fault according to the result of the frequency domain analysis; the device Including the dislocation initial judgment module and the dislocation confirmation module. The invention has the advantages of simple implementation method, low cost, automatic diagnosis of blade installation dislocation, and high diagnosis accuracy and efficiency.