136 results about "Protective relay" patented technology

The invention provides a circuit breaker control loop integrity monitoring method and related device.A relay protection tripping and closing monitoring circuit comprises an opening control loop and a closing control loop, the opening control loop comprises a tripping action contact TJ, a tripping outlet pressing plate LP1, a tripping protection relay TBJ, a circuit breaker normally-open auxiliary contact DL1 and a tripping coil TQ; two ends of the tripping action contact TJ are connected with a first monitoring module; the closing control loop comprises a closing action contact HJ, a closing outlet pressing plate LP2, an anti-tripping relay normally-closed auxiliary contact TBJV1, a closing holding relay HBJ, a circuit breaker normally-closed auxiliary contact DL2 and a closing coil HQ; two ends of the closing action contact HJ are connected with a second monitoring module; through the arrangement of the first monitoring module and the second monitoring module, the whole loop is monitored, a monitoring blind area can be eliminated, a fault signal can be found in time, secondary operation and maintenance personnel can conveniently process in advance, and an event that the circuit breaker refuses to operate is prevented.

The embodiment of the invention discloses an automatic acceptance method and system for relay protection equipment, and relates to the technical field of power system automation, and the method comprises the steps: obtaining a preset acceptance outline template and a configuration description file to which target relay protection equipment belongs; analyzing the configuration description file to extract actual signal information related to the target relay protection equipment; automatically associating the actual signal information with a preset signal in the acceptance outline template to generate an instantiated acceptance outline; in response to the acceptance instruction, automatically interacting with the target relay protection equipment according to the instantiated acceptance outline to execute the test item; automatically acquiring a response result of the target relay protection equipment in the process of executing the test item; comparing the response result with an expected result preset for the test item in the instantiated acceptance outline, judging a test conclusion and generating a structured test report; automation of the acceptance process of the relay protection equipment can be realized, and the accuracy, reliability and efficiency of testing are improved.

Systems and Methods for capacitance testing of a unit under test with parasitic capacitance directed to a guard rail. The system includes test points, wherein the plurality of test points are divided into at least two groups; a stimulus source; a first group guard relay electrically connected to each of the test points in a first; a second group guard relay electrically connected to each of the test points in a second; a guard rail coupled to the first group guard relay and the second group guard relay; a first group return relay electrically connected to each of the test points in a first group; a second group return relay electrically connected to each of the test points in a second group; a current measurement rail coupled to the first group return relay and the second group return relay; a current meter coupled to the measurement rail; and a controller.

The invention particularly relates to a high-voltage frequency converter which comprises a working frequency converter, a standby frequency converter, a protection relay, a current transformer and a voltage transformer. A breaker is arranged on an inlet wire of the working frequency converter, a breaker is arranged on an outlet wire of the working frequency converter, the breaker of the outlet wire of the working frequency converter is connected with a protection relay, the protection relay is connected with a current transformer and a voltage transformer, and the voltage transformer is connected with the standby frequency converter. The standby frequency converter inlet wire is provided with a circuit breaker, and the standby frequency converter outlet wire is provided with a circuit breaker. An outgoing line of the working frequency converter is connected with an outgoing line of the standby frequency converter and a motor incoming line, the motor incoming line is connected with a first motor incoming line breaker and a second motor incoming line breaker in series, and a switching breaker is arranged on a line where the outgoing line of the working frequency converter is connected with the outgoing line of the standby frequency converter. Rapid switching from the working frequency converter to the standby frequency converter is achieved, and the standby frequency converter is automatically started under the working conditions that the working frequency converter breaks down and an outgoing line circuit breaker of the working frequency converter is not triggered to be opened.

A system for protecting a MEMS relay switch system that controls electric current to a load includes a parallel resonant circuit in series with the MEMS relay switch system. The parallel resonant circuit includes an auxiliary switch in series with a capacitor configured to be pre-charged by a voltage source, and an inductor in parallel with the auxiliary switch and the capacitor. The inductor is in series with the MEMS relay switch system. A method includes receiving a signal, activating an auxiliary switch, determining if the received signal is a turn OFF or a turn ON signal, and depending on the received signal, setting a time delay within a resonant half cycle of a parallel resonant pulse circuit, turning off the auxiliary switch, and pre-charging a capacitor of the parallel resonant pulse circuit.

The present application relates to generating adaptive protective relay event reports. In one embodiment, a system comprises a power system response subsystem to monitor electrical parameters in an electric power system and to receive a trigger signal from a trigger source based on identification of an event in an electric power system. An adaptive event report subsystem is configured to generate an adaptive report depending on the trigger related to the event and based on a pre-trigger start, a duration, and a sampling rate. The adaptive event report comprises at least one electrical parameter related to the event beginning at a time established by the pre-trigger start, covering an interval established by the duration, and recorded at the sampling rate.

The invention relates to the technical field of low-voltage power distribution control, and discloses a low-voltage bypass sequence control method and device based on phase sequence recognition and a fracture state. The method comprises the following steps: acquiring voltage waveform data of a low-voltage three-phase circuit through an integrated protection relay, sampling, and outputting a phase sequence identification result; generating an opening and closing control instruction based on the identification result, transmitting the opening and closing control instruction to a spring operation mechanism to execute opening and closing actions, and outputting a fracture state signal; the fracture state signal is subjected to long-distance imaging display through the large window insulation structure to obtain an imaging confirmation result of the fracture state; and generating state indication information based on an imaging confirmation result, performing comprehensive judgment by using the information in control logic, and executing low-voltage bypass switching-on operation when a judgment condition is met. According to the invention, organic combination of phase sequence identification, opening and closing control and fracture state visualization is realized, the safety and reliability of the low-voltage distribution network in the bypass operation process can be improved, and the risk of misoperation is avoided.

The utility model discloses a circuit capable of inhibiting surge voltage between contacts when a relay acts. The circuit comprises a relay, a resistor, a piezoresistor, a diode, a direct current electromagnetic coil and a binding post. When a high-capacity inductive load in a circuit loses power, a relatively high reverse electromotive force, namely a surge voltage, is generated. A resistor-diode series follow current loop and a piezoresistor-diode series surge suppression loop are reversely connected in parallel to the two ends of an inductive load, when the load loses power and generates reverse electromotive force, the follow current loop eliminates or reduces the electromotive force, and the surge suppression loop is conducted and shunted when the electromotive force exceeds a threshold value, so that surge voltage is prevented from being generated through dual protection; and a relay contact and a circuit are protected. The scheme is a passive suppression protection circuit, has the advantages of simple structure, low cost, fast response, recoverability, dual protection and the like, and improves the operation stability and reliability of equipment.

A power system asset may include an individual circuit breaker, a switchgear that may include multiple circuit breakers, or any other asset that may be included in a power system. The system for monitoring and diagnosing these power system assets may include one or more intelligent protection relay and switchgear monitor device(s) that may be communicatively coupled in a master-slave or peer-peer configuration in a time-synchronized manner of operation.

To provide a protection relay system capable of properly communicating electricity amount data and accident analysis data of a plurality of relay devices by using the same network.SOLUTION: A protection relay system includes: a plurality of network switches; a plurality of relay devices connected to each network switch; and an analysis device and a management device, which are connected to any one of the plurality of network switches. The management device collects reception information of data in each network switch. The analysis device transmits a first transmission request of accident analysis data with respect to the plurality of first relay devices to the management device. The management device generates a plurality of second transmission requests based on reception information in response to the first transmission request from the analysis device, and sequentially transmits the plurality of generated second transmission requests to each first relay device. Each first relay device transmits accident analysis data to the analysis device according to the received second transmission request.SELECTED DRAWING: Figure 1

The present invention discloses a method and device for controlling a tramway turnout, the method comprising: receiving a command for handling a route or single-operation turnout, and judging whether the turnout action condition is met; when the turnout action condition is met, driving the turnout action relay to be attracted, and driving the turnout protection relay to be attracted after a first preset time; collecting the turnout position state, judging whether the turnout has completed the position conversion according to the turnout position state, and stopping driving the turnout protection relay when the turnout has completed the position conversion, and stopping driving the turnout action relay after a first preset time. The present invention can realize the safe conversion of the turnout, ensure the safe operation of the train, and can extend the service life of the relay, and reduce the maintenance workload and maintenance cost of the switch machine.

Systems and Methods for capacitance testing of a unit under test with parasitic capacitance directed to a guard rail. The system includes test points, wherein the plurality of test points are divided into at least two groups; a stimulus source; a first group guard relay electrically connected to each of the test points in a first; a second group guard relay electrically connected to each of the test points in a second; a guard rail coupled to the first group guard relay and the second group guard relay; a first group return relay electrically connected to each of the test points in a first group; a second group return relay electrically connected to each of the test points in a second group; a current measurement rail coupled to the first group return relay and the second group return relay; a current meter coupled to the measurement rail; and a controller.

To provide a power supply system of a microgrid capable of surely determining a ground fault during independent operation.SOLUTION: A power supply system includes: a non-fundamental wave component injection unit that is connected to a power system via a circuit breaker and injects a non-fundamental wave component indicating a current and / or a voltage having a frequency different from that of a fundamental wave into a bus to which AC power having a predetermined frequency is supplied; a first measurement unit that is provided in a power line that electrically connects the bus and a load and into which the non-fundamental wave component is shunted and measures a zero phase current or a zero phase voltage including the non-fundamental wave component; a ground fault determination unit that determines a ground fault based on the zero phase current or the zero phase voltage measured by the first measurement unit in a state where the circuit breaker is opened; and a protection relay drive unit that opens a load circuit breaker that is the circuit breaker that opens and closes the power line in order to protect the load when the ground fault determination unit determines the ground fault.SELECTED DRAWING: Figure 1

A solid state circuit breaker module (17) for integration into a power converter, the circuit breaker module (17) having a housing (19) containing: a. A semiconductor switch (7) acting as a main overcurrent protection means; b. An electromechanical protection relay (9) serving as a fallback over-current protection device; c. A fuse (35) serving as a final overcurrent protection device; d, a current sensor used for detecting overcurrent; e. A controller for tripping the semiconductor switch (7) and the protective relay (9) when the current sensor detects an overcurrent; and f. A sealed gas chamber (29) filled with an arc extinguishing gas, the gas chamber (29) housing the semiconductor switch (7), the protective relay (9) and the fuse (35).

The utility model discloses a controllable soft start circuit of an electric welding machine. The controllable soft start circuit comprises a rectifier bridge, a PTC (Positive Temperature Coefficient) resistor, a filter circuit, a relay and an active control circuit, a pin 1 of the rectifier bridge is connected with an external live wire, and a pin 3 of the rectifier bridge is connected with an external zero wire; one end of the PTC resistor is connected with a pin 4 of the rectifier bridge; the filter circuit is connected with the other end of the PTC resistor and a pin 2 of the rectifier bridge and is used for filtering; the relay is connected with the PTC resistor and external 24V voltage; the active control circuit is connected with the relay and used for controlling the working state of the relay. According to the controllable soft start circuit of the electric welding machine, due to the fact that the network voltage of an alternating-current power grid is sine waves and the frequency is 50 Hz, a network voltage zero crossing point can be formed every 20 ms, on the basis of an original circuit, a relay is controlled to be opened at the zero crossing point of the alternating-current power grid, at the moment, the relay can be effectively protected, and the service life is prolonged.

The present disclosure provides an electronic circuit, which relates to the field of circuits. The electronic circuit provided by the present disclosure includes a power supply circuit and a protection circuit; wherein the power supply circuit includes a power supply, a load, and a relay, and the power supply supplies power to the load when the relay is closed; the protection circuit is connected in parallel with the load, and the protection circuit forms a loop with the load when the relay is disconnected. By adding a protection circuit, the present disclosure can absorb the induced electromotive force generated by the load when the relay is turned off, thereby avoiding damage to the contacts caused by the impact of the induced electromotive force when the relay is turned off, thereby effectively protecting the contacts of the relay and improving the reliability and safety of the relay.

The utility model discloses an anti-misoperation device for a universal circuit breaker, which comprises an under-voltage release, a shunt release, a closed electromagnet, an energy storage motor, a voltage monitoring module and a current monitoring module, and the voltage monitoring module and the current monitoring module are both used for increasing judgment conditions for internal line faults of the universal circuit breaker. According to the invention, the normally closed contact of the under-voltage protection relay is connected in parallel with the normally closed contact of the under-voltage release in the universal circuit breaker, and the normally open contact of the over-current protection relay is connected in series with the normally open contact of the shunt release, so that conditions for line fault judgment are added. The circuit breaker trips only when the internal intelligent tripper and the external monitoring module judge the line fault at the same time, so that tripping events caused by misoperation of the intelligent tripper are effectively reduced, and the accuracy and reliability of judging the line fault by the universal circuit breaker are remarkably improved.

The utility model discloses a car window locked-rotor control circuit and a car window switch, relates to the field of car accessories, and solves the problem that the cost is high when car window locked-rotor control is realized through an integrated chip. The forward rotation microswitch or the reverse rotation microswitch drives the motor to operate to drive the window glass to ascend or descend, when the motor is locked, the locked-rotor current is increased, the voltage of the first resistor is changed, the first transistor or the second transistor is triggered to be switched on, and then a coil of the protection relay is powered on; the normally-open static contact of the protection relay is closed, and the normally-closed static contact is opened, so that the motor is powered off and stops running. Through the circuit formed by discrete components, the programming control of a microcontroller with higher cost is avoided, the circuit design is simplified, the cost is reduced, and the quick response, the power supply cut-off and the motor damage prevention when the motor stalls are realized.

The present invention discloses a design method for an intelligent operation board. A MOSFET circuit is added to the internal circuit of a line protection box. When a circuit breaker fails, the MOSFET circuit can automatically cut off the control power supply of the operation circuit through a CPU control command, without generating arcing, thereby protecting the closing and opening coils of the circuit breaker from being burned. On the intelligent board, control output can be performed according to external information, and the circuit can be controlled according to feedback signals and an internally set opening and closing holding time. The design method of the intelligent operation board of the present invention can record various on-site operations, perform accident analysis, and protect the opening and closing coils of the circuit breaker and the opening and closing relay nodes on the measurement and control equipment, thereby solving the problem of only protecting the relay nodes and sacrificing the opening and closing coils of the circuit breaker.

The present invention provides a program generation device that can automatically generate programs to realize the functions of a protective relay device while reducing the amount of configuration work performed by humans. [Solution] The program generation device includes a database generation unit that generates a configuration database for each of a plurality of merging units. The configuration database includes connection configuration information and substation configuration information relating to substations, input / output information, and hardware type. The program generation device further includes a module generation unit that generates operation program modules for merging units based on the configuration database. The module generation unit selects a basic program module based on the hardware type and generates an operation program module by setting transmission setting information, reception setting information, and network address in the basic program module.

The invention provides a power supply control circuit of a welding machine tool, a power supply and the welding machine tool. The circuit comprises a main contactor, an overvoltage protection relay, an undervoltage protection relay, a high-temperature protection relay and a low-temperature protection relay. A movable contact of the first normally open contact of the main contactor is used for being connected with a phase line of a power supply, and a static contact of the first normally open contact of the main contactor is connected with a first end of a welding machine tool; a movable contact of a second normally open contact of the main contactor is used for being connected with a neutral line of the power supply, a static contact of the second normally open contact of the main contactor is connected with a second end of the welding machine tool, and a third end of the welding machine tool is grounded; a first end of a coil of the main contactor is connected with a phase line, and a second end of the coil of the main contactor is sequentially connected with a normally-closed contact of the low-temperature protection relay, a normally-closed contact of the high-temperature protection relay, a normally-open contact of the under-voltage protection relay, a normally-closed contact of the overvoltage protection relay and a neutral line. The welding condition of the welding machine can be controlled, and the welding effect is guaranteed.

A power converter is connected between a power supply line and a ground line, and the power supply line is connected to a battery. The power converter supplies converted power to a load by converting direct current power of the battery. A control circuit controls the power converter by a voltage applied from the battery. A reverse-connection protective relay is connected to the ground line, and interrupts a current flowing from the ground line to the power supply line via the power converter in a case where the battery is connected in a reverse direction. A voltage required for turning on the reverse-connection protective relay is applied to a gate of the reverse-connection protective relay in a case where the battery is connected in a forward direction, and is not applied to the gate of the reverse-connection protective relay in a case where the battery is connected in the reverse direction.

Systems and Methods for capacitance testing of a unit under test with parasitic capacitance directed to a guard rail. The system includes test points, wherein the plurality of test points are divided into at least two groups; a stimulus source; a first group guard relay electrically connected to each of the test points in a first; a second group guard relay electrically connected to each of the test points in a second; a guard rail coupled to the first group guard relay and the second group guard relay; a first group return relay electrically connected to each of the test points in a first group; a second group return relay electrically connected to each of the test points in a second group; a current measurement rail coupled to the first group return relay and the second group return relay; a current meter coupled to the measurement rail; and a controller.

The present invention discloses a method for diagnosing faults in a ship's power grid based on a DHNN neural network. By classifying faults in the ship's power grid, encoding switches and protection relays, constructing a fault diagnosis system for the ship's power grid, and training the DHNN network, the DHNN network is finally used to quickly identify the fault classification to which the data input belongs when a fault occurs in the ship's power grid. This application combines the DHNN neural network, is applicable to diagnosing various faults in the ship's power grid, quickly analyzes and locates faults, ensures the efficiency and safety of fault finding, and improves the efficiency of maintenance personnel.

The embodiment of the utility model provides an insulating property testing device. The insulation performance testing device comprises a water tank, a voltage supply assembly and at least two testing circuits connected to the voltage supply assembly in parallel, the water tank is used for placing an insulation wearable device, and each testing circuit comprises a protection relay, a breaking circuit and a connecting circuit which are sequentially connected in the direction away from the voltage supply assembly. The protection relay is provided with a movable joint which can move and through which current can pass, the breaking circuit is connected between the movable joint and a first end of the connecting circuit, a second end of the connecting circuit is used for being arranged in a conducting medium in the insulating wearable equipment, and the movable joint is triggered and moves when the insulating wearable equipment is broken down. Therefore, the breaking circuit disconnects the mobile joint and the first end of the connecting circuit. The insulating property testing device provided by the embodiment of the utility model has the advantages of high automation degree, high safety performance and high testing efficiency, and can test a large number of insulating wearable devices at the same time.

The application provides a kind of digital non-electric quantity protection method and device of on-load tap changer, and belongs to the field of transformer protection.The method comprises: obtaining the current oil flow rate instantaneous value of the detection point in the oil reservoir connecting pipe connected with the on-load tap changer to be measured;If the current oil flow rate instantaneous value is greater than the first preset protection action threshold value, a trip signal is sent to the protection relay, so that the protection relay disconnects the circuit breaker;If the current oil flow rate instantaneous value is not greater than the first preset protection action threshold value, the oil flow rate instantaneous value at the next time is obtained, and the oil reservoir connecting pipe unit mass transformer oil kinetic energy change rate is determined based on the current oil flow rate instantaneous value and the oil flow rate instantaneous value at the next time;If the kinetic energy change rate is greater than the second preset protection action threshold value, a trip signal is sent to the protection relay, so that the protection relay disconnects the circuit breaker.The application can improve the reliability of the protection device, and can avoid misoperation, solve the problem of low reliability and misoperation of mechanical gas protection at present.

1. The name of the design product: voltage switching protection relay. 2. The use of the design product: voltage protection and automatic switching for multi-path power supply. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best indicates the design points: perspective view.

According to an embodiment of the present disclosure, a relay assembly, a method of controlling the relay assembly, and a storage medium are provided. The relay assembly includes a first relay adapted to be arranged between a power supply circuit and a load; an auxiliary switching circuit disposed in parallel with the first relay between the power supply circuit and the load, and including a second relay and a transistor component connected in series, the closing time of the transistor component being less than a predetermined threshold; the control unit is coupled to the first relay, the second relay and the transistor component, and is configured as follows: when a loop between the power supply circuit and the load is switched on, the second relay is firstly switched on, then the transistor component is switched on at the voltage zero crossing point, and then the first relay is switched on; and when the loop is disconnected, the second relay and the transistor component are closed successively and then the first relay is disconnected, and then the transistor component and the second relay are disconnected successively. Therefore, impact current is reduced, the relay is protected, and the service life of the relay is prolonged.

The utility model discloses a protection relay and a double parallel starter, belonging to the starter technology field, the protection relay comprises a protector and a relay, the protector comprises a control circuit, a first lead of the protector is connected with a coil terminal of the relay, and a third lead is connected with a coil tail end of the relay; the protector further comprises a grounding end and a switch element, and the switch element is connected between the third lead and the grounding end. The double-parallel starter comprises two starters and the protection relay, the protection relay is connected between the ignition switch and the switch terminal of the electromagnetic switch, and the second lead of the protector is connected with the motor terminal of the electromagnetic switch. When the judgment condition that the starter has the tooth jacking condition or is not engaged successfully is met, the electromagnetic switch is powered off by disconnecting the relay, the situation that the coil of the electromagnetic switch of the starter is ablated after being powered on for a long time is avoided, and the tooth jacking protection function, the delayed power-off function and the active engagement function are achieved.

The utility model relates to a relay protection circuit, a control system and a door control device, the relay protection circuit comprises a voltage reduction time delay module, a switch module, a detection control module, a strong current control module, a direct current power supply and a relay, the input end of the voltage reduction time delay module is connected with the direct current power supply, and the output end of the voltage reduction time delay module is connected with the first end of a coil of the relay; the second end of the coil is connected with the switch module, the strong current control module is arranged on a branch where a contact of the relay is located, and the detection control module is connected with the direct-current power source and the strong current control module. The detection control module in the relay protection circuit sends the control signal to the strong current control module to disconnect the branch where the contact is located when the direct current power supply is powered down, the power-off time of the branch where the coil is located is later than the power-off time of the branch where the contact is located under the action of the voltage-reducing delay module, and the relay contact is disconnected after the large current disappears, so that the relay is protected. Ablation can be avoided, so that the relay and an electrical connecting piece thereof are protected.