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Monitoring apparatus for lifting machine
The invention relates to a monitor for a hoisting machine, which comprises a rotary encoder for detecting displacement of the hoisting machine and outputting impulse signals corresponding to the displacement of the hoisting machine, a control unit for calculating speed of the hoisting machine by using the impulse signals received from the rotary encoder, and a mode selecting module for switching the control unit between a standard mode and an actual operational mode, wherein in the standard mode, the control unit records the calculated speed of the hoisting machine as standard speed, and in the actual operational mode, the control unit compares actual speed of the hoisting machine calculated at a preset position with the standard speed corresponding to the preset position, so that the control unit sends out stop signals to stop the hoisting machine when a difference value of the actual speed and the standard speed is larger than a first threshold value. The monitor has the advantages of simple structure, high precision and wide appliance range.
Owner:CHINA ENFI ENGINEERING CORPORATION
Ground fault line selection method based on high-frequency component correlation
The invention discloses a ground fault line selection method based on high-frequency component correlation. The method comprises the following steps: S1) monitoring a zero sequence voltage value of an exit of each power distribution line in real time, and if the zero sequence voltage value is larger than a limit value, judging a power distribution network has a ground fault, and collecting zero sequence current of each line; S2) carrying out denoising processing on the zero sequence current of each line to obtain a pure fault component ; S3) carrying out EMD decomposition on the pure fault component to obtain various transient frequency components, and then, through instantaneous frequency analysis, removing a power frequency component and extracting a corresponding high-frequency transient component; and S4) carrying out pairwise correlation analysis on the high-frequency transient component of each line to obtain a correlative coefficient matrix M, and solving integrated correlation coefficient [rho]i of each line. The ground fault line selection method has the advantages of simple principle, high anti-interference capability and high protection precision and the like.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
Pulsating DC (direct current) aftercurrent protector and running method thereof
ActiveCN102231510AHigh protection precisionAccurate protectionEmergency protective arrangements for automatic disconnectionHemt circuitsPower grid
The invention provides a pulsating DC (direct current) aftercurrent protector and a running method thereof. The protector comprises a switching device, a microprocessor, a zero sequence current transformer, an aftercurrent signal amplifying circuit and a power supply, wherein the output of the zero sequence current transformer is connected with the aftercurrent signal amplifying circuit; the output of the aftercurrent signal amplifying circuit is connected with the microprocessor; the switching device is connected with the microprocessor; the input of the power supply is connected with a power grid; and the output of the power supply and the microprocessor are connected with the switching device. The protector can distinguish the types of aftercurrent waveforms and adopts the different protective measures in accordance with the different types of the aftercurrent waveforms, thus improving the protection accuracy; and the protector is suitable for the aftercurrent protection of the power grid with different frequencies or can be used for realizing the accurate aftercurrent protection when the frequency of the power grid is changed, thus expanding the application occasions of the protector. The protector is simple in structure, small in volume and very low in power consumption.
Owner:HEBEI UNIV OF TECH
Simulation method of opening radius of energy release hole of high-voltage cable joint explosion-proof device
ActiveCN109190277ASimple designAccurately derive the functional relationshipGeometric CADDesign optimisation/simulationPhysical fieldEngineering
The invention relates to the technical field of explosion-proof devices for high-voltage cable joints, and specifically relates to a simulation method for the opening radius of an energy release holeof a high-voltage cable joint explosion-proof device, which comprises the following steps of: adopting COMSOL Multiphysics multi-physical field coupling simulation software to construct models of different types of energy release hole explosion-proof devices; adopting the mode of heat-flow-solid multi-physical field coupling, calculating the maximum gas velocity and pressure distribution in the explosion-proof chamber corresponding to the design of different radii of the blowout holes; according to the exponential function law, obtaining the function relation between the maximum pressure and the size of the energy dissipation hole in the explosion-proof device by the least square method. Considering the secondary damage caused by the reduction of the maximum pressure inside the explosion-proof device and the reduction of the jet flow through the vent hole, the optimized radius of the vent hole is designed. The invention can optimize the size design of the energy dissipation hole of theexplosion-proof device of the high-voltage cable joint, save the test cost, improve the protection precision, and provide a reliable theoretical calculation method for the explosion-proof device design.
Owner:GUANGDONG POWER GRID CO LTD +1
Phase current sudden change based earth fault protection method
ActiveCN105914718AImproved resistance to arc faultsHigh protection precisionEmergency protective circuit arrangementsCorrelation coefficientPhase correlation
The invention discloses a phase current sudden change based earth fault protection method which comprises the following steps: 1) online monitoring the zero sequence voltage of a power distribution network wherein when the zero sequence voltage exceeds the limit value of the voltage, the transient phase current signals of all lines are collected; 2) extracting the sudden changes in the transient phase current signals of all lines; 3) conducting two-on-two correlation analysis on the sudden changes in the transient phase current signals to obtain phase correlation coefficients [Rho AB, Rho BC Rho CA]; comparing for the smallest correlation coefficient Rho min; and 4) based on the identical correlation coefficients to find out the lines in fault. The method, with simple principles, is easy to perform for enhanced protection accuracy and reliability.
Owner:长沙精科电力技术有限公司
AC motor unbalanced protection method based on unbalanced accumulation
InactiveCN101123348AHigh protection precisionGuaranteed accuracyEmergency protective circuit arrangementsPiecewise linearizationThree-phase
The invention discloses an alternating current dynamo imbalance protection method based on unblanced accumulation. The method is conducted according to the following steps. Firstly, three-phase load current of an alternating current dynamo is collected, and the unbalancedness at the moment is figured out. Unbalancedness accumulation coefficients between grade points corresponding to unbalancedness are counted; accumulated dynamo unbalancedness increment of the dynamo within specified time and accumulated value of unbalancedness of the current time are calculated, respectively by using corresponding accumulation coefficients of all points; the accumulation value of unbalancedness of the current time is compared with the set threshold of strip to determine whether the stripping relay is triggered and to protect the dynamo. The invention method adopts the unbalancedness accumulation model to prevent the dynamo from imbalance; and piece-wise linearization method is adopted to adjust the unbalancedness accumulation coefficient DC dynamically, and imbalance protection precision of the alternating current dynamo is significantly improved.
Owner:XIAN UNIV OF TECH
Circuit protection device, circuit protection method and circuit protection equipment
InactiveCN104518477AHigh protection precisionThere is no security riskArrangements responsive to excess currentOver current protectionCircuit protection
The invention relates to a circuit protection device, a circuit protection method, and a piece of circuit protection equipment. The circuit protection device comprises a first switch coupled between a load and a power supply used for powering the load, and a controller coupled to the first switch. The controller is used for switching off the first switch when judging that an abnormality occurs according to a first signal, and switching on the first switch when judging that the abnormality is eliminated according to a second signal and a third signal, wherein the first signal indicates the current flowing through the load when the first switch is switched on, the second signal indicates the power voltage of the power supply, and the third signal indicates the load voltage of the load. By adopting the circuit protection device and the circuit protection method provided by the invention, an abnormal state can be identified accurately, over-current protection can be provided, the circuit can recover from the over-current protection state in a timely manner, and almost no security risks exist.
Owner:AOTU ELECTRONICS WUHAN
Encoding and decoding method and device for virtual machine command, and virtual machine protection system
InactiveCN106960141AHigh protection precisionEnhanced decompilation difficultyPlatform integrity maintainanceProgram/content distribution protectionCompilerVirtual machine
The invention discloses an encoding method, a decoding method, an encoding device and a decoding device for a virtual machine command, and a virtual machine protection system.The encoding method comprises the steps of when compiling a program to be compiled, randomly modifying a command encoding format of the virtual machine command of the program to be compiled; and generating a rear end output command of a compiler according to the randomly modified command encoding format.
Owner:ALIBABA GRP HLDG LTD
Method for implementing overload inverse-time protection of alternating-current motor
InactiveCN102013668AImprove reliabilityHigh protection precisionEmergency protective circuit arrangementsTime functionMonitoring system
The invention discloses a method for implementing overload inverse-time protection of an alternating-current motor, which comprises the following steps of: acquiring a three-phase current signal of the motor, calculating the load rate beta at the moment, acquiring inverse-time protection operation time t0 at the moment according to a permissible overload time function t=f(beta) when the beta is greater than a set value, setting a sampling period time as delta t, and acquiring an inverse-time protection operation remaining time T=t0-mdeltat (m is sampling frequency); and if the beta is changed during overload, acquiring a new operation remaining time T=tn-(t'n+mndeltat)n=0,1,2,3,... according to a temperature rise function of the motor, wherein when the T is equal to 0, a peripheral circuit implements protection. The method can make corresponding adjustment according to the change of the overload current during overload to further improve the reliability and protection precision of motor overload protection, can provide protection operation remaining time data for a product monitoring system, and is favorable for operation of a user; and the design is more humanized.
Owner:SHANDONG UNIV OF SCI & TECH
External circuit breaker tripping control device of electric energy meter
ActiveCN106098487AReduce feverIncrease the current level to useProtective switch operating/release mechanismsPower flowNormal load
The invention discloses an external circuit breaker tripping control device of an electric energy meter. The external circuit breaker tripping control device comprises an electric operating unit and more than one circuit breaker unit. The loop of each circuit breaker unit is provided with a wiring board. The wiring board is a shunting component for detecting current. The shunting part of the wiring board is connected with a sampling current lead and performs sampling on a current signal in a sampling loop. A current signal is transmitted to a main wiring board of an electric operating unit. The main wiring board performs analysis and comparison on a detected current signal, thereby determining a normal load current or an overload current. On the condition that the current is the overload current, a CPU on a main circuit board transmits a tripping instruction, thereby driving an electric operating mechanism to trigger tripping of the circuit breaker and realizing overload protection of the circuit breaker. According to the external circuit breaker tripping control device, a bimetallic strip and related components in a traditional circuit breaker are replaced, and a circuit board is utilized for performing overcurrrent determining, thereby realizing higher protection precision, no debugging on the circuit breaker and high convenience in production.
Owner:XIAMEN HONGFA ELECTRICAL SAFETY & CONTROLS CO LTD
Verification method, device and system for virtual machine instruction
ActiveCN106960138AImprove securityHigh protection precisionProgram/content distribution protectionComputer architectureVirtual machine
The invention discloses a verification method, device and system for a virtual machine instruction. The method comprises the steps that when a to-be-tested program is executed, an intermediate instruction in a current byte code file of the to-be-tested program is acquired, wherein the intermediate instruction is located between type designated instructions appearing in a pair, and the type designated instructions appearing in a pair include a starting instruction used for instructing starting of verification of the intermediate instruction and an ending instruction used for instructing ending of verification of the intermediate instruction; the intermediate instruction is verified according to a preset algorithm to obtain a first verification value; and the first verification value is compared with a second verification value preset in the type designated instructions, and when the first verification value and the second verification value are the same, it is determined that the intermediate instruction passes verification, and the to-be-tested program continues to be executed.
Owner:ALIBABA GRP HLDG LTD
Energy-saving intelligent controller and control method thereof
InactiveCN101174139AReduce power consumptionHigh protection precisionProgramme controlComputer controlMicrocontrollerElectric distribution network
The invention relates to an energy-saving type intelligent controller and the control method thereof, which comprises a display module, a monolithic processor, a human body infrared sensor, an integrated operational amplifier, a comparator and an optical coupler. The output terminal of the sensor is respectively connected with the two input terminals of the comparator through a voltage follower with time delay function and a reference voltage obtained by dividing the voltage through two resistors, after being compared, two signals are input into the input terminal of the optical coupler by the output terminal of the optical coupler, the output terminal of the optical coupler outputs the signals to the input terminal of the monolithic processor, and after being judged, the signals whether or not are displayed are input into the display module. Because the invention leads a light activated element to be arranged in the controller and to be processed by a circuit, when people stand in front of the controller, a liquid crystal display screen enters a display state, when no person stands, the controller does not enter into the display module, the signal processing chip of the controller keeps in the dormant state, and the controller only protect and detect a power distributing network. In the way, the power consumption of the controller is greatly decreased, the operating time is shortened, and the protection precision of the controller is improved.
Owner:TIANJIN BAILI ELECTRIC CO LTD
Protection device and method for rotary supporting bearing and driving motor of thickener
ActiveCN103500985AEasy to identifyEffective protectionEmergency protective arrangements for automatic disconnectionDrive motorEngineering
The invention relates to the technical field of thickeners in a mine mineral processing process and particularly relates to a protection device and method for a rotary supporting bearing and a driving motor of a thickener. The protection device comprises a primary driving circuit of the thickener, a slide wire and a current collector, and is composed of a three-phase current transformer, a driving motor protector, a tripping and sound-light alarming device and an RS485 / RS232 converter which are arranged among the driving circuit of the thickener, the slide wire and the current collector in sequence; a first circuit breaker with a shunt release is arranged among the slide wire, the current collector and a motor or a second circuit breaker with the other shunt release is arranged between the driving circuit of the thickener and the three-phase current transformer; and the RS485 / RS232 converter is connected with an upper computer and a display. The protection method comprises overcurrent protection of the driving motor, and bad contact and phase loss protection of the driving motor. The protection device and method for the rotary supporting bearing and the driving motor of the thickener have high protection precision, accurate movement, strong anti-interference performance and complete functions, and can effectively protect the rotary bearing of the thickener.
Owner:ANSTEEL GRP MINING CO LTD
Inverse time current limiting electrical fire prevention and control device and method
InactiveCN107528290AOverall small sizeSmall on-state resistanceEmergency protection detectionEmergency protective arrangements for automatic disconnectionCurrent limitingPower flow
The invention discloses an inverse time current limiting electrical fire prevention and control device and method. The device comprises a control unit, a solid-state switch, an analog signal conditioning circuit and a current detection unit used for detecting instantaneous alternating current information of the protected loop. The output end of the current detection unit is connected with the input end of the control unit through the analog signal conditioning circuit. The output end of the control unit is connected with the solid-state switch. The protected loop is connected with a power supply through the solid-state switch. The device and the method have the inverse time characteristic, and the volume is small.
Owner:XIAN HIRATE NET ELECTRIC EQUIP CO LTD
DC line breakage protection method of multi-end flexible DC power distribution system
ActiveCN109638791ASimple protection principleSmall amount of calculationEmergency protective circuit arrangementsClosed loopLine current
The invention discloses a DC line breakage protection method of a multi-end flexible DC power distribution system. With regard to different running modes of open loop and closed loop of the multi-endflexible DC power distribution system, the fault characteristic thereof during a DC line breakage fault is analyzed, on the basis, the difference between the fault level and the non-fault level is further amplified by taking sum and difference of currents of a fault level circuit and a non-fault level circuit as division, and the purpose of reliably identifying the fault level circuit is achieved.The DC line breakage protection method is applicable to a condition that the DC line breakage fault occurs in the multi-end flexible DC power distribution system under different running mode, the situation that line breakage protection is difficult to achieve due to unobvious line breakage fault characteristic is prevented, and rapid fault identification and pole selection can be achieved according to local measurement information.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Intelligent circuit breaker
PendingCN110137048ARealize intelligent controlImplement localSwitch terminals/connectionsSwitches with electromagnetic releaseIntelligent controlCircuit breaker
The invention provides an intelligent circuit breaker, which comprises a housing, a first wiring end, a second wiring end, a handle, a tripping linkage mechanism, an electromagnetic tripper, a movingcontact, a static contact, a bimetal sheet, a current transformer, a drive mechanism, a first driving member, a second driving member, a first connecting member, a second connecting member and a circuit board. The moving contact is corresponding to the static contact. The intelligent circuit breaker can solve the problem that a traditional circuit breaker is poor in protection precision and incomplete in protection, realizes a distribution protection function and meanwhile, realizes intelligent control of the intelligent circuit breaker, can carry out on / off control according to power demand,and can also realize local or remote centralized monitoring management, thereby improving power distribution safety and intelligence degree.
Owner:天津市中力神盾电子科技有限公司
Electronic thermorelay
InactiveCN1571232AOvercoming poor movement consistencyImprove product gradeArrangements responsive to excess currentSingle phaseIntegrated circuit
The invention is an electronic thermal relay, composed mainly of shell, terminal, reset button, indicator light and circuit device, where the circuit device is arranged in the lower part of the shell, a measurer is arranged in the upper part of the shell and provided with equipment instruction electromagnetic control relay, single-phase double-metal thermal component and Hall component to detect traveling distance of the single-phase double-metal thermal component, and the circuit device includes a protecting circuit, composed mainly of IC (integrated circuit), the Hall component is connected with the IC, the measured signal of the Hall component instructs the electromagnetic control relay to act through IC operation instruction equipment. Its switching-on and -off are clear and the current overload protection for the motor is effective and accurate.
Owner:YUEQING HONGSHENG ELECTRONICS APPLIANCES
Master control board of human-machine interactive sports car and control system of human-machine interactive sports car
The invention provides a master control board of a human-machine interactive sports car. The master control board comprises a master control module, a power module, an external power interface, a charge and discharge module, a motor driving module and a sensor module. The charge and discharge module is in connection with the external power interface, the power module and the motor driving module. The charge and discharge module is also used for connecting with battery packs. The sensor module comprises a gyroscope, an acceleration sensor and a hall sensor. The gyroscope is used for detecting declination information of a car body; the acceleration sensor is used for detecting acceleration information of the car body; the hall sensor is used for detecting velocity information of the car body. The sensor module is connected with the master control module, the PWM driver interface of the master control module and the motor driver module. The master control module is used for receiving the declination information, the acceleration information and the velocity information, performing data fusion, and outputting a drive signal to the motor driving module, the driving module drives a motor to revolve according to the drive signal, and the safety coefficient is high. The invention also relates to a control system of the human-machine interactive sports car.
Owner:HANGZHOU CHIC INTELLIGENT TECH
Electronic multi-sectional overcurrent protection device
ActiveCN102184811AHigh protection precisionImprove practicalityProtective switch operating/release mechanismsAdjustment of protective switch conditionsShort circuit protectionEngineering
The invention discloses an electronic multi-sectional overcurrent protection device and relates to the technical field of protection of molded case circuit breakers and molded case residual current operation circuit breakers. The device is provided with a winding L1; a short-circuit protection element consisting of a static armature, a movable armature, a roller pin and a resetting torsional spring is arranged at the upper end of the winding L1; a bent part is arranged at the upper end of the static armature symmetrically; a limiting groove A is formed at one end on the inner side of the bentpart; a limiting groove B is formed in the middle of the bent part; a winding L2 and a winding L3 are arranged at the lower end of the winding L1; the winding L1 is a primary side winding, and the winding L2 and the winding L3 are secondary side windings; the head of the winding L2 is connected with the tail of the winding L3; and the tail of the winding L2 and the head of the winding L3 are voltage signal output ends. The electronic multi-sectional overcurrent protection device has the advantages of setting or adjusting an overcurrent protection operation value on site, and remotely setting or controlling in combination with corresponding equipment.
Owner:PIZHOU GUOLONG ELECTRIC
High-precision and high-reliability LED vehicle lamp driving circuit
PendingCN113056063AAvoid Common Mode Noise InterferenceHigh protection precisionElectrical apparatusSemiconductor lamp usageVoltage rangeAutomotive engineering
The invention discloses a high-precision and high-reliability LED vehicle lamp driving circuit. The circuit comprises a bias module, an error amplification module, a current detection compensation module, a pulse width modulation module, a PWM control module, an output driving module, an oscillator module (OSC), a high-precision high-reliability undervoltage protection circuit (UVLO), a high-precision high-reliability overvoltage protection circuit (OVLO), a high-precision wide-voltage-range over-temperature protection circuit (OTP) and a power switch NMOS tube MG. According to the driving circuit provided by the invention, on one hand, the common-mode interference detection circuit is adopted in the temperature protection circuit, so that common-mode noise interference is avoided, and the protection precision is improved; and on the other hand, a power supply burr detection circuit is adopted in an overvoltage protection circuit and an undervoltage protection circuit, a reset signal is output under an abnormal condition, a protection signal is locked in advance, and the reliability of the circuit is improved. The invention can be widely applied to various high-voltage integrated circuit chips.
Owner:HUANGSHAN RUIXING AUTOMOBILE ELECTRONICS
Built-in current overload protector
PendingCN110660612AThe resistance value can be adjusted at willAccurate impactThermal switch detailsMetallic enclosureStructural engineering
The invention discloses a built-in current overload protector, which comprises a metal shell with an opening at the bottom, a metal bottom plate for sealing the bottom of the metal shell, a bimetallicstrip and a plurality of binding posts, wherein one end of the bimetallic strip is provided with a moving contact, one end of one of the binding posts is provided with a static contact, and the moving contact and the static contact are arranged correspondingly. The built-in current overload protector further comprises a double-piece connecting sheet made of metal, and the double-piece connectingsheet can adjust the resistance value of the bimetallic strip at will. One end of the double-piece connecting sheet is fixedly connected with the other end of the bimetallic strip, and the other end of the double-piece connecting sheet is fixedly connected with the inner wall of the metal shell. The double-piece connecting sheet comprises a sheet body made of copper alloy, iron alloy or stainlesssteel. The sheet body of the double-piece connecting sheet is provided with at least one through hole or at least one bulge. According to the invention, accurate protection of different protection precisions or protection levels required by different electrical equipment is achieved by adopting the double-piece connecting sheet with different resistance values.
Owner:JIANGSU CHANGRONG ELECTRICAL APPLIANCE CO LTD
Self-powered switching-on instantaneous protecting device
ActiveCN103259242AHigh protection precisionEasy to set valueEmergency protective arrangement detailsCapacitanceElectrical battery
The invention discloses and provides a self-powered switching-on instantaneous protecting device. According to the self-powered switching-on instantaneous protecting device, a current transformer (CT), a power circuit, a battery, a boosted circuit, an energy-storage capacitor and a closing coil are added on an ordinary self-powered microprocessor protecting device, wherein the current provided by the CT is rectified to a direct current by the power circuit and then is provided for the energy-storage capacitor after passing through the boosted circuit and serves as the power supply of the closing coil, a normally open contact of a relay is connected in a power supply circuit of the closing coil in series, and the battery serving as a back-up power supply is charged when the CT obtains power and does not consume electric energy when the CT losses power. Therefore, the self-powered switching-on instantaneous protecting device does not need auxiliary power supplies and does not need to be supplied with power independently, protecting accuracy is high, definite value setting is convenient, and switching-on instantaneous protecting is achieved. The self-powered switching-on instantaneous protecting device can be widely applied to transformer substations which are located in remote areas and in which working environment is poor and no direct current or alternating current stabilified-voltage power is supplied externally.
Owner:ZHUHAI RADIANCE ELECTRIC
A ground fault current detection circuit and method
ActiveCN105391044BThe principle is simpleLow costFault locationEmergency protective arrangements for limiting excess voltage/currentElectrical resistance and conductanceFull bridge
The invention relates to an earth fault current detection circuit and method. A current transformer outputs a current signal to be directly connected to a full-bridge rectifier circuit formed by diodes; CTA+ and CTA- are connected to a rectifier bridge formed by diodes D2, D3, D4 and D5; CTB+ and CTB- are connected to a rectifier bridge formed by diodes D6, D7, D8 and D9; CTC+ and CTC- are connected to a rectifier bridge formed by diode D10, D11, D12 and D13; and each diode are connected with an acquisition resistor in series, adopts a fixed-frequency sampling mode, waveforms of phases A, B and C are superposed through a software algorithm, and an earth fault current effective value is calculated by adoption of a well-known effective value method. The circuit provided by the invention is simple in principle, low in cost and high in protection precision, and is particularly suitable for electrical appliance protection switches with a relatively high requirement for space volume and relatively small rated power.
Owner:JIANGSU DAQO KFINE ELECTRIC
Current-based longitudinal differential protection method and system for belt conveyor
ActiveCN113285420AImprove accuracyImprove reliabilityConveyorsControl devices for conveyorsControl engineeringControl theory
The invention relates to a current-based longitudinal differential protection method and system for a belt conveyor, which are used for protecting the belt conveyor during operation. The method comprises the following steps of periodically collecting the current value of the belt conveyor, and judging whether the belt conveyor is in no-load operation or not, if yes, protecting the belt conveyor through the no-load protection step, and if not, protecting the belt conveyor through the load protection step. Compared with the prior art, the method has the advantages of high accuracy, high reliability, good safety, strong timeliness and the like.
Owner:华能(上海)电力检修有限责任公司
Full state monitoring with power-off protection alarm circuit
ActiveCN110190582BRealize common alarmAccuracy adjustableEmergency protection detectionArrangements responsive to excess currentControl theoryAC power
The invention provides a full-state monitoring and power failure protection alarm circuit and aims to provide a protection alarm circuit having properties of low cost, powerful functions and wide application. The alarm circuit is characterized in that a solid relay connected with a status monitoring unit is connected with a sound and light rotation prompter through a built-in switch output end, anAC switch is connected in series through an AC access wire with a built-in switch input end of the solid relay to constitute an AC loop of a sound and light prompting alarm unit. When a monitored load works normally, the positive power is supplied to the monitored load through a power-off control relay normally-on group switch and passes through a current monitor to the ground to form a power supply loop, a working status of the monitored load is monitored by the current monitor in real time, signal changes detected in real time are sent to left and right two positive signal access points ofan upper half of a comparator through a no-load switch normally-on group switch, signal reference is completed for left and right two negative signal access points of the upper half of the comparator,and the sound and light rotation prompter is connected with the AC power supply loop to realize the alarm.
Owner:10TH RES INST OF CETC
Charger
ActiveCN107139743AHigh protection precisionImprove protection reliabilityCharging stationsElectric devicesSingle chipSquare wave
The invention discloses a charger, which comprises a single chip microcomputer, a voltage output module, a relay, an output voltage detection module and a battery voltage detection module, wherein a first end of the relay is connected with the voltage output module and the output voltage detection module separately and a second end of the relay is connected with the battery voltage detection module and a battery separately; the voltage output module, the output voltage detection module, the relay and the battery voltage detection module all are connected with the single chip microcomputer; the output voltage detection module is used for detecting a voltage value of the first end; the battery voltage detection module is used for detecting a voltage of the second end; and the single chip microcomputer is used for adjusting the voltage value output by the voltage output module through adjusting the duty ratio of a square wave of the single chip microcomputer when the voltage value of the first end is different from the voltage value of the second end, so that the voltage value of the first end is the same as that of the second end. The charger has higher reliability.
Owner:GUANGZHOU SHIYUAN ELECTRONICS CO LTD
Method for implementing overload inverse-time protection of alternating-current motor
InactiveCN102013668BImprove reliabilityHigh protection precisionEmergency protective circuit arrangementsAlternating currentTime data
Owner:SHANDONG UNIV OF SCI & TECH
Current signal output circuit for microcomputer protection device and microcomputer protection device
PendingCN114200998AImprove job performance indicatorsHigh protection precisionElectric variable regulationMicrocomputerNegative feedback
The invention provides a current signal output circuit for a microcomputer protection device and the microcomputer protection device. The current signal output circuit comprises an input resistor, a signal amplifier, a sampling resistor, a differential circuit and a negative feedback resistor, one end of the input resistor is connected with an external to-be-converted voltage end, the other end of the input resistor is connected with a reverse input end of the signal amplifier, an output end of the signal amplifier is connected with a non-inverting input end of the differential circuit, and two ends of the sampling resistor are respectively connected with the non-inverting input end and the reverse input end of the differential circuit. One end of the sampling resistor connected to the reverse input end is a current output end, the current output end is connected with an external supply circuit, one end of the negative feedback resistor is connected with the output end of the differential circuit, and the other end is connected with the reverse input end of the signal amplifier. The microcomputer protection device solves the technical problems that a current signal transmission circuit of a microcomputer protection device in the prior art is sensitive to temperature change and electromagnetic interference, and meanwhile the signal precision and response speed are poor.
Owner:SHENHUA SHENDONG COAL GRP +1
Low voltage switch, control method and device
ActiveCN106655074BHigh protection precisionHigh measurement accuracyEmergency protective arrangement detailsDifferential signalingLow voltage
The invention discloses a low-voltage switch and a control method and device. The low-voltage switch comprises a mutual inductor, at least two followers, a first processor and a second processor, wherein the mutual inductor outputs differential signals; the followers are connected with the mutual inductor to enhance the driving capability of the differential signals; the first processor is connected with the mutual inductor to meter a preset parameter of a target object; and the second processor is connected with the at least two followers to protect the target object according to the differential signals output by the two followers. The technical problem that the low-voltage signal can only be used for protective equipment in the prior art is solved.
Owner:北京德威特电气科技股份有限公司
A primary and secondary fused pole circuit breaker protection adjustment method
PendingCN122512549AHigh protection precisionImprove protection reliabilityControl theoryReverse power flow
The application provides a primary and secondary fusion column circuit breaker protection adjustment method, comprising: collecting voltage phase data and current waveform data from three-phase positions of a bus in real time, obtaining photovoltaic grid-connected point output proportion and reactive power injection amplitude sequence during low voltage ride through, and reading current district photovoltaic penetration from a district configuration file; according to the voltage phase data and the reactive power injection amplitude sequence, correcting phase offset of each period according to the change rule that reverse power flow gradually increases with the increase of output during photovoltaic output climbing, calculating the initial discrimination range of the maximum sensitivity angle of the directional element; taking the corrected discrimination angle width as an effective window for phase comparison, comparing the current bus voltage phase with the reactive power injection amplitude, identifying the phase pullback phenomenon caused by low voltage ride through, and extracting the phase swing characteristics of the bus voltage.
Owner:HENAN HUATUO ELECTRIC POWER EQUIP CO LTD +1