94 results about "Protective relay" patented technology

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 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.

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.

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 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 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.

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.

The utility model relates to the technical field of input signal control, and discloses a control circuit for an external input signal of an internal connection system, which comprises a resistor R228, a capacitor C241, a triode Q13, a clamping diode D39, a relay K2 and an interface J9. According to the invention, accurate and stable control of external input signals is realized, damage of excessive current to subsequent elements is avoided based on current limiting of control signals, circuit safety is guaranteed, voltage fluctuation is reduced based on voltage stabilization, signal transmission is more stable, voltage abnormity is prevented based on clamping, and the relay K2 is protected. High and low levels are generated to control the switching action of the relay, three switching channels are output to the interface, a control signal is accurately transmitted to external equipment, and the interface is connected with a plurality of signals to adapt to the requirements of different external equipment, so that the problems of poor stability and low precision of a traditional control circuit are solved; and the requirements of external equipment with relatively high signal response requirements are met.

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.

A low power switch for use low voltage electrical monitoring circuits provided with signals from a low power instrument transformer such as found in substation facilities that signals via a communication protocol the operational status of potential, current and signal secondary circuits when connected to protection and monitoring devices (or test devices) such as protective relays, fault recorders or any other monitoring and controlling device. The low power switch includes various safety features to prevent damage to the equipment or harm to a technician.

According to the state monitoring method and system for the relay protection tripping outlet pressing plate, the physical state signal of the hard pressing plate is obtained through sensor fusion, the physical state signal is preprocessed to obtain multi-source signal data, and the data accuracy is guaranteed; feature extraction is carried out on the multi-source signal data to obtain state feature information of the hard pressing plate, and a basis is provided for judging the state of the hard pressing plate; judging whether the hard strap is in a connection state or not based on the state characteristic information, if yes, injecting a test current into a hard strap loop, collecting a voltage difference between the two ends of the hard strap, judging whether the hard strap is in a suspected virtual connection state or not, if yes, triggering multi-source signal data to verify whether the hard strap is in a determined virtual connection state or not, and if not, judging whether the hard strap is in a virtual connection state. The virtual connection type is judged and determined, and an alarm signal is sent to assist maintenance personnel to quickly solve problems; based on the state of the hard pressing plate, a historical operation curve of the hard pressing plate is generated and machine learning is performed on the historical operation curve, the abnormal state of the hard pressing plate is predicted, and maintenance personnel are helped to discover problems in time.

The utility model relates to a fan engine room dry type variable resistance relay protection device, apply to dry type transformer, including differential protection relay, first current transformer, second current transformer and third current transformer, dry type transformer is three winding transformer, first current transformer, second current transformer and third current transformer are all through -core type current transformer, the high voltage side of dry type transformer is connected high voltage side bus through high voltage side circuit breaker, the normally open contact of differential protection relay connects the tripping loop of high voltage side circuit breaker, the first current transformer is set in the high voltage side wire outside, the second current transformer is set in the medium voltage side wire outside, the third current transformer is set in the low voltage side wire outside, the output of first current transformer, the output of second current transformer and the output of third current transformer connect the differential coil of differential protection relay, the utility model discloses can cut out transformer low voltage side fault in time.

This invention provides a high-voltage contact protection relay for mining frequency converters, relating to the field of relay structure technology. It includes a fixed electrode, a movable electrode, and an electromagnet core. An elastic support structure is provided between the fixed and movable electrodes, and they are separated under the action of the elastic support structure. The electromagnet core is used to push the movable electrode to apply a thrust, causing the movable electrode to overcome the elastic force of the elastic support structure and slide into contact with the fixed electrode. The invention is characterized by: a first mounting hole being formed on the end face of the movable electrode facing the fixed electrode; a first contact and a support spring being disposed within the first mounting hole; and the bottom end of the support spring abutting against the upper end of the first contact. This invention, by changing the arc formation position, can effectively prevent the formation of an arc at the contact surface between the fixed and movable electrodes, thus protecting the contact between the fixed and movable electrodes, reducing poor contact caused by ablation, and improving the stability and reliability of the relay.

This disclosure relates to a protection assisting device configured to communicatively connect to a first protection system at a first substation and a second protection system at a second substation, the first and second substations electrically connected to a power line, the first and second protection systems communicatively connected via a primary communication network, said first and second protection systems cooperating to provide differential protection via respective first and second protection relays based on a power line measurement of the power line at the first substation and a power line measurement of the power line at the second substation. The protection assisting device is configured to provide protection assisting information to the first and second protection relays based on predetermined protection assistance condition(s) determined from operational data received from the first and second protection systems via a secondary communication network, which secondary communication network is a non-dedicated communication network.

The invention relates to the technical field of anti-surge valve testing, and discloses an anti-surge valve reciprocating action performance testing system which comprises a tested valve, a reciprocating action control system and a power source system. Wherein the reciprocating action control system comprises a PLC (Programmable Logic Controller), an analog quantity module, a touch display screen, a plurality of relays, a switching power supply, an air switch and a knob switch. The touch display screen is connected with the switching power supply through an electric wire and is powered by the switching power supply; meanwhile, the device is connected with the PLC and the analog quantity module through a network cable. The knob switch is connected with the PLC and analog quantity module through an electric wire to control the PLC and analog quantity module to be powered on and powered off; the air switch is connected with the switching power supply and the knob switch through wires, and the circuit is protected when the voltage is abnormal; the relay is connected with the PLC and the analog quantity module through an electric wire. The system can comprehensively and accurately test the reciprocating motion performance of the anti-surge valve and the stability of the valve by simulating the actual switching reciprocating motion of the anti-surge valve, and provides a reliable basis for the use of the anti-surge valve. The device has the advantages of being easy and convenient to operate, high in testing efficiency and accurate and reliable in testing result, and meets the performance testing requirements of reciprocating motion of the anti-surge valve.

Systems, methods, and computer-readable media are disclosed for monitoring and diagnosing power system assets. Examples of power system assets can include individual circuit breakers, switchgear that can include multiple circuit breakers, or any other asset that can be included in a power system. A system for monitoring and diagnosing these power system assets can include one or more intelligent protective relays and switchgear monitor device(s) that can be communicatively coupled in a master-slave or peer-to-peer configuration in a time-synchronized operational manner.

A method for a collaborative protection mask in a wide-area protection system is disclosed. The method comprises determining, in a first zone, whether a first pair of protection relays (R5, R6) detects a fault occurrence on a first line (L3) from a first activation mask (DI) based on a first weighting factor. The method comprises determining, in the first zone, whether the first pair of protection relays detects the fault from a second activation mask (DII) based on a second weighting factor, and determining, in a second zone, whether a second pair of protection relays (R3, R8) detects the fault from the second activation mask based on the second weighting factor. The method comprises determining detections from a third activation mask (DIII) using the first, second, and third pairs of relays (R1, R10), and performing one or more operations on the first pair of relays based on the collaborative determinations.

A power system includes a power supply, a common bus, and two or more receptacles coupled to the common bus. In addition, the power system includes two or more connectors, each connector coupled to a receptacle of the two or more receptacles. The power system further includes a protective breaker coupled to the common bus between the power supply and the receptacles, the protective breaker operated by a protective relay and a low voltage power supply. Further, the power system includes an umbilical cord, the umbilical cord passing from the low voltage power supply to the protective relay through each receptacle and each connector such that the removal of any connector from any receptacle breaks the electrical pathway between the low voltage power supply and the protective relay.