672results about How to "Realize the protection function" patented technology

The invention relates to a comprehensive automation integrated protecting method and a system which adopt an integrated IED to carry out automation functions such as protection, measurement and control, computation and the like of all bay units in a substation; state quantity, analog quantity and digital quantity which are output in interval by primary equipment on a process layer of the substation are respectively uploaded to the integrated IED through an ethernet switcher by a dual Ethernet (100mega/1000mega), and the protection and automation function of the substation are realized by calculating and processing the state quantity, analog quantity and digital quantity which are output in interval respectively by the integrated IED, therefore, a spacing layer and a substation layer of the substation are unified into one layer according to IEC61850 standard, and a plurality of IEDs are integrated into one integrated protecting IED, and two same integrated IEDs are provided for hot spare for improving the reliability. The comprehensive automation integrated protecting system leads the substation integrated protecting functions to share a uniform information platform, and communication network is used for replacing control cables, thus improving the reliability of the signal transmission, further improving automation and management level and reducing comprehensive construction cost.

The invention discloses a method and a device for recovering mixed regenerative energy of an urban railway power supply system. The method comprises the steps of determining an energy feedback/absorption mode according to the AC power grid failure state, controlling an energy feedback converter to feed regenerative brake energy back to the AC power grid in the energy feedback mode, and converting regenerative brake energy into direct-current low-voltage electricity to be absorbed by an energy absorption component in the energy absorption mode. The device comprises a direct-current disconnecting switch unit, an energy feedback transformer, a converter control unit and at least one converter unit. Each of the at least one converter unit comprises the energy feedback converter, an energy feedback branch switch K1, an energy absorption branch switch K2 and three energy absorption components. By means of the method and the device, regenerative brake energy is absorbed by the energy absorption component during the failure of the AC power grid to maintain the stability of the DC power grid voltage, and the connection between the energy recovery device and the DC power grid is not needed to be cut off, so that the safe reliability of the energy recovery device is improved, the structure of a chopper can be omitted, and costs are saved.

The application discloses a rack end protection method of an electric power steering system. When a rack of a steering gear moves towards the end of the rack and enters a rack end protection area, an ECU (electronic control unit) of the electric power steering system takes a rotating angle of a steering wheel, the speed of the rotating angle and rotating torque as input to calculate a rack end protection gain value which serves as a multiplier during assisting torque calculation. The rack end protection gain value is the product of a basic gain coefficient, a rotating speed gain coefficient and a rotating torque gain coefficient. The basic gain coefficient decreases progressively as the absolute value of the rotating angle of the steering wheel increases. The rotating speed gain coefficient decreases progressively as the absolute value of the rotating angle of the steering wheel increases. The rotating torque gain coefficient increases progressively as the absolute value of the rotating angle of the steering wheel increases. According to the rack end protection method of the electric power steering system, during working conditions of rack ends, current output can be limited, temperature rise can be reduced and mechanical impact of the rack ends can be avoided.

The invention discloses a distributed generation-based grid connection transition operation mode coordination comprehensive protection method. When the DG capacity is continuously increased, the short-circuit current level is improved, the DG is changed from a "pure load" into a "small power supply", and a problem that conventional protection and switching breakpoints cannot meet the transition condition is solved. Based on the conventional protection and the switching breakpoints, the scheme provided by the invention performs continuous matching with a primary operation model and is continuously optimized, and the information and the state quantity are continuously exchanged to form a protection control interface adapted to a primary system, so that dual purposes of safe operation of a system and continuous power supplying are achieved. The fault isolation range is determined by collecting a new boundary which is determined by the switching breakpoints, and that whether the system sectionalizing and the island operation mode generated as a boundary point is determined is stable or not is comprehensively considered.

The invention discloses an intelligent electronic type voltage transformer. The intelligent electronic type voltage transformer comprises a far-end module, an amorphous iron core, an optical fiber composite insulator, an insulating oil layer, a resistance-capacitance voltage divider, an optical fiber and a combination unit. According to the intelligent electronic type voltage transformer, the iron core is made of amorphous materials, a resistance-capacitance voltage division principle is used as a design principle, and a transformer body is formed by pouring insulting silicone rubber on the amorphous iron core, a primary winding and a secondary winding. According to the intelligent electronic type voltage transformer, the iron core is made of amorphous alloy, so that the intelligent electronic type voltage transformer has high saturated magnetic induction and low loss, the weight and the size of the intelligent electronic type voltage transformer can be reduced greatly, and efficiency can be improved greatly. In addition, the intelligent electronic type voltage transformer has low noise, is easy and convenient to install and use, does not need maintaining in an operation process, is light in weight, high in accuracy, good in linearity and wide in measuring range, overcomes the defects that a conventional electromagnetic voltage transformer is narrow in frequency band, slow in response and the like, and has practical significance to transformation of and improvement to existing electrical equipment, and the ability to resist electromagnetic interference is enhanced.

The invention relates to a protective circuit of a control and protection switch. The circuit comprises: a microprocessor circuit, a signal acquiring circuit, a power supply circuit, an input circuit, a drive circuit, an output control circuit, a human-computer interface circuit and a communication circuit. The circuit has a plurality of protection functions such as overload, phase failure, underload, imbalance and the like, as well as the display function of nixie tubes and the communication function of field buses, and can form a digital control and protection switch capable of communicating together with the main body of the control and protection switch. The protective circuit of the control and protection switch adopts few elements, effectively realizes the protection, control, measurement and display functions of the control and protection switch by reasonable connection, and has communication function. The circuit is simple in connection and high in anti-interference performance, and has the advantages of small volume and high reliability when used in the control and protection switch.

The invention provides a protective composite material, which comprises a protective layer, a functional layer and a comfort layer stacked in order; from the end of the protective layer, the functional layer includes a nuclear radiation shielding layer, an electromagnetic shielding functional layer and a textile substrate which are sequentially stacked, or, the functional layer includes the nuclear radiation shielding layer and the textile substrate which are sequentially stacked; and from a fabric substrate end, the comfort layer includes a neutron protective coating and a polypropylene high-molecular substrate which are sequentially stacked. The invention also provides a preparation method of the protective composite material. The protective composite material has multiple functions of flame retardation, static prevention, anti-ionization/electromagnetic radiation and neutron protection, and can be used for processing nuclear radiation protective clothing and protective tents, flexible protective screens and the like.

The invention discloses a photovoltaic power station system with low voltage ride through and anti-islanding protection functions. The photovoltaic power station system comprises a photovoltaic power generation system array, a first breaker, a three-phase inverter, a filter, a parameter detecting module, a loader, a second breaker, a transformer, a power grid and a controller. The output current of the photovoltaic power generation system array sequentially passes through the first breaker, the three-phase inverter and the filter to be input into the input end of the parameter detecting module, one path of the parameter detecting module is connected with the loader, the other path of the parameter detecting module is connected with the power grid through the transformer and the second breaker, the parameter detecting module can detect switch signals of the second breaker and the voltage V and the frequency f of the coupled point between the parameter detecting module and the loader and input the switch signals, the voltage V and the frequency f to the input end of the controller, one path of the output end of the controller is connected with the inverter to provide PWM signals to the inverter, and the other path of the output end of the controller is connected with the first breaker. The photovoltaic power station system combines the low voltage ride through function and the anti-islanding protection function, so that the purpose of improving the stability and the safety of the photovoltaic power station system is achieved.

A motor vehicle, includes a drive motor for driving the motor vehicle, at least one additional motor and at least one differential for distributing a torque generated by the drive motor and transmitted by a drive shaft to a driven differential element of the differential to two output shafts. The motor vehicle includes a coupling device which can be controlled by a control device, and in a first coupling state directly or indirectly couples the additional motor with an output shaft, thereby rendering the distribution of the drive torque to the output shafts dependent on an additional torque exerted by the additional motor, and in a second coupling state directly or indirectly couples the additional motor with the driven differential element.

The invention provides a relay protection device of a variable pitch blade system of a wind driven generator. The device comprises a power source, a variable pitch blade motor relay, a brake relay, a relay control circuit and a control power source, wherein the power source is used for supplying power to the variable pitch blade motor and a brake thereof; the variable pitch blade motor relay is used for controlling power-on or power-down of the variable pitch blade motor; the brake relay is used for controlling the power-on or power-down of the brake; the relay control circuit is used for controlling the power-on or power-down of the variable pitch blade motor relay and the brake relay; the control power source is used for supplying power for the relay control circuit; and the relay control circuit is a digital circuit. The device has the advantages of realizing digital protection of a single blade, improving the action feature and the performance of the relay protection, occupying small space and volume of a shaft control cabinet and greatly reducing the power consumption, along with high correctness, stability, reliability and self-examination and polling capacity, friendly man-machine interface, superior technical structural conditions, remarkable economic benefit and obvious technical improvement, and is flexible and convenient to use, and easy to use on a large scale and popularize.

The invention discloses a position feedback and protection device of a sub-span super wind tunnel diffuser adjustment sheet. The position feedback and protection device comprises a framework, a strokesensor, adjustment sheets, a simulation adjustment sheet, a limit switch and a wind tunnel body, wherein the adjustment sheets in a wind tunnel body cavity are symmetrically arranged at two sides ofthe central axis of the wind tunnel body, upstream ends of upstream adjustment sheets are attached to an inner wall surface of the wind tunnel body through an upstream stretching rod perpendicular toa wall surface of the wind tunnel body, downstream ends of the upstream adjustment sheets are hinged with one end of a throat stretching rod perpendicular to the wall surface of the wind tunnel body,the two symmetric upstream adjustment sheets form a required airflow channel, an airflow throat is formed at the narrowest point of the adjustment pieces, the downstream may have no adjustment sheet or is hinged with at least one downstream adjustment sheet segment through a downstream stretching rod perpendicular to the wall surface of the wind tunnel body, a tail end of the downstream adjustmentsheet is attached to an inner wall surface of the wind tunnel body, and the simulation adjustment sheet is in hinge connection with an outer side of the wind tunnel body through an upstream stretching rod, a throat stretching rod and a downstream stretching rod.

The invention discloses a compact type insulated gate bipolar transistor (IGBT) module driving unit. The compact type IGBT module driving unit comprises a power board, a driving core board and a driving adaptive board, wherein a control protection circuit is arranged on the driving core board, a driving circuit is arranged on the driving adaptive board, and the power board, the driving core board and the driving adaptive board are connected in sequence through a cable or connecting terminals. According to the compact type IGBT module driving unit, a power module is independently arranged, core circuits of control protection and the like of an IGBT module are placed in the driving core board, the driving circuit is placed in the adaptive board, and only a corresponding module adaptive board needs to be changed so as to correspond to IGBT modules of different manufacturers and different model numbers. The core board can be connected with module adaptive boards of various model numbers, so that the aim of being in common use is achieved. A temperature measurement circuit, an electric current measurement circuit and a control protection circuit are designed to be in the same driving core board, wherein the temperature measurement circuit, the electric current measurement circuit and the control protection circuit are arranged in a dispersed mode, so that compactibility is achieved. Optional functions such as overheating protection, short pulse suppression and weak light protection are arranged, so that flexible smart configuration is achieved.

Being installed on bus of transformer substation, dedicated integrated protection relay (IR) is connected to current transformer and voltage transformer on all outgoing wires of bus. Combining with new development in traditional protection and protection of power distribution, IR makes up of new protection including three phases: first phase is instantaneous trip unit; second phase is acceleration trip unit implemented by using directional comparison technique of communication channel or technique of non channel; in third phase, based on collected information of fault and direction sent from IR through network, integrated network protection unit sends out corresponding trip command directly. The invention provides quick protection for single sect of wire, as well as integrated protection function for whole system of power distribution. The invention possesses wide foreground of application along with development of measurement, communication, and process etc. techniques.

The invention discloses an underground refuge corridor smoke prevention, protection and cold source system based on artificial intelligence. The system comprises an underground refuge corridor, a first fireproof compartment and a second fireproof compartment. A first refuge corridor smoke prevention front chamber is arranged between the first fireproof compartment and the underground refuge corridor, a second refuge corridor smoke prevention front chamber is arranged between the second fireproof compartment and the underground refuge corridor, the first fireproof compartment corresponds to thefirst refuge corridor smoke prevention front chamber, the second fireproof compartment corresponds to the second refuge corridor smoke prevention front chamber, a smoke prevention front chamber pressurization air supply well is arranged between the first refuge corridor smoke prevention front chamber and the second refuge corridor smoke prevention front chamber, an air cooling unit outdoor unit is arranged in the smoke prevention front chamber pressurization air supply well, and communicating air openings are formed among the first refuge corridor smoke prevention front chamber, the first fireproof compartment and the underground refuge corridor and among the second refuge corridor smoke prevention front chamber, the second fireproof compartment and the underground refuge corridor. The intelligence degree is high, fire prediction is accurate, underground space is saved, and the energy saving effect is good.

The invention provides an after-current circuit breaker operation mechanism which comprises a handle and a transmission mechanism which are arranged in a rotating mode, a tripping fastening assembly, a releasing piece and a free releasing mechanism. The transmission mechanism comprises a first connection rod connected with a handle and a second connection rod in pivoting connection with the first connection rod. The second connection rod is in transmission connection with a movable contact. The tripping fastening assembly comprises a tripping fastening piece, a locking fastening piece, a tripping fastening spring and a locking fastening spring. The releasing piece drives the locking fastening piece to move to enable the tripping fastening piece to be separated from the locking fastening piece. The free releasing mechanism enables the movable contact to move when the handle does not rotate. The free releasing mechanism comprises a cam arranged in a rotating mode and a third connection rod, a protruding portion of the cam contacts the tripping fastening piece in an abutting mode, one end of the third connection rod is in pivoting connection with the cam, and the other end of the third connection rod is in pivoting connection with the connection position of the second connection rod and the first connection rod. When the stripping fastening piece is separated from the locking fastening piece, the cam drives the tripping fastening piece to rotate to drive the third connection rod to drive the second connection rod to move to drive the movable contact to move. The mechanism is simple in structure and capable of achieving a free releasing function without the aid of external force.