48 results about "Protective relay" patented technology

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.

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.

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 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.

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 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 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.

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.

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 common input unit capacitor (553) has a high-potential-side electrode connected to a power supply line (Lp) that is connected between a plurality of systems on the power converter (601, 602) side as compared to reverse connection protection relays (521, 522) of the systems. At initial check, a boost circuit (20) performs over-boost processing for temporarily raising a target voltage above a value at normal operation. A pre-charge circuit (30) applies the boosted voltage (VS) resulting from the over-boost processing to the high-potential-side electrode of the common input unit capacitor (553). A monitoring circuit (40) detects, one by one for the reverse connection protection relays (521, 522) of the systems, an OFF-state sticking abnormality according to a post-relay voltage (Vry) which is the voltage on the inverter side of the reverse connection protection relays.

The input conversion board, analog input board, and arithmetic processing board provided on the protective relay can be removed independently of each other. The analog input board (20) to be calibrated is mounted on the board mounting section (61) of the calibration system (60). The phase reference signal generation circuit (80) generates a phase reference signal (92) in response to the trigger signal (76). The calibration power supply (62) generates a sinusoidal calibration analog signal (64) based on the phase reference signal (92) and the amplitude setpoint (91). The control device (70), which outputs the trigger signal (76) and the amplitude setpoint (91), determines the gain correction value and phase correction value (94) of the analog input board (20) by comparing the amplitude and phase of the first digital conversion signal (93) generated by A / D conversion of the calibration analog signal (64) with the phase of the amplitude setpoint (91) and the phase reference signal (92).

The application discloses a kind of relay protection hard pressure plate position monitoring device, method and equipment, device includes: the direct current electric field of the wiring between relay protection tripping outlet terminal to hard pressure plate connection terminal is monitored in real time electric field monitoring module, and micro control unit;Electric field monitoring module, for the electric field signal of the direct current electric field of wiring is obtained electric field signal sequence according to sampling frequency N acquisition, electric field signal sequence is sequentially preprocessed and average processing, and the electric field signal average value sequence of containing polarity and size is obtained;Micro control unit, for comparing the continuous M electric field signal average values of electric field signal average value sequence with preset threshold condition respectively, and the hard pressure plate position condition is obtained according to comparison result.Thereby the technical problem that prior art cannot monitor relay protection hard pressure plate position in real time, accurately is solved.

The application discloses a memory single-bit flip test system and method for a relay protection device, and belongs to the technical field of relay protection device reliability testing. The system comprises: a relay protection device to be tested; an automatic test platform configured to issue a memory single-bit flip instruction to the relay protection device to be tested, read the running indicator light state, protection outlet state and event uploading message of the relay protection device to be tested, perform result judgment and write a test report; and a relay protection tester controlled by the automatic test platform and configured to apply an electrical fault quantity signal to the relay protection device to be tested, so as to verify the protection function state of the relay protection device to be tested. The application realizes the automation of the memory single-bit flip test of the relay protection device, effectively saves working hours and improves test efficiency.

The utility model discloses an abnormal protection circuit and ATE test system, abnormal protection circuit includes signal processing module and protection relay, signal processing module includes signal input and signal output, protection relay includes first connecting end, second connecting end and first switch control end, signal processing module's signal input is used for connecting the first output of main control module to detect whether main control module is normal work, signal processing module's signal output and protection relay's first switch control end are coupled, and the first connecting end of protection relay is used for connecting the power supply output of power supply module, and the second connecting end of protection relay is used for connecting the unit of being measured, adopts above -mentioned technical scheme, can real -time detection main control module output's electric signal, and when detecting abnormal signal, immediately take measures, ensure the safety of unit of being measured, and simultaneously do not influence normal test process.

A trip circuit for protecting a power distribution system includes a trip coil. The trip coil includes a first coil terminal coupled to a first bus line. Moreover the trip circuit includes a self-power relay that provides energy to the first bus line and a second bus line. Further, the trip circuit includes a normal setting contact and a reduced setting contact each coupled to the second bus line and a second coil terminal of the trip coil in parallel. The self-power relay provides energy to the first and second bus line via Impulse Outputs (POs). Additionally, the switch can control whether the trip circuit operates in a normal setting or a reduced setting.

A protective intelligent electronic device (IED), such as a protective relay, includes a processor to execute protection routines and / or data acquisition routines. The protective IED or an associated networking device may include, for example, a measurement module to monitor processor burden and control logic to detect Ethernet storms based on a dynamic burden function threshold. In response to storm detection, non-critical Ethernet traffic is throttled while critical protection functions are maintained. Auxiliary communication subsystems and / or critical protocols such as RSTP may continue to function during a storm mitigation mode. The systems and methods described herein leverage dynamic CPU burden assessments, traffic prioritization, and hysteresis logic to limit toggling between storm mitigation and normal operation modes.

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 system for time synchronization between multiple operating systems is provided, the system includes a Field Programmable Gate Array (FPGA) configured to obtain and maintain absolute time; and multiple operating systems (OS) that obtain the absolute time from the FPGA and perform time synchronization based on the obtained absolute time. According to the embodiments of the present disclosure, the system can solve the high accuracy time synchronization problem in a protection relay device with multiple operating systems.

The utility model belongs to the technical field of motor control circuits, and particularly relates to a steam turbine oil cooler pipeline booster pump motor frequency conversion control device. Comprising a frequency converter main circuit which comprises a circuit breaker QF1, a frequency converter and a contactor KM1; the three-phase power supplies L11, L21 and L31 are connected to the input ends R, S and T of the frequency converter through normally open contacts of the circuit breaker QF1, and the output ends U, V and W of the frequency converter are connected to the motor M through normally open contacts of the contactor KM1; the power frequency bypass circuit comprises a circuit breaker QF2, a contactor KM2 and an overload protection relay KH; the three-phase power supplies L11, L21 and L31 are connected to the input end of the overload protection relay KH through a normally open contact of the circuit breaker QF2, and the output end of the overload protection relay KH is connected to the motor M; by performing frequency conversion transformation on the motor, the current of the motor is reduced, the energy-saving requirement is met, meanwhile, the stability and reliability of motor operation are improved, and efficient operation of a power generation system is guaranteed.

The utility model discloses a loop protection relay module, which comprises a horizontally arranged circuit board, the upper surface of the circuit board is provided with a plurality of electrical components, four corners of the circuit board are respectively provided with an assembly hole in a penetrating manner, and the loop protection relay module is characterized in that the four corners of the upper surface of the circuit board are respectively provided with an elastic buffer ring; the four assembly holes are located in the inner sides of the corresponding buffer rings respectively, and nuts of the fastening screws can be tightly pressed on the buffer rings. According to the utility model, the risk that the circuit board is fractured by the nut of the fastening screw can be reduced, thereby ensuring the normal use of the relay module.

The invention discloses a relay protection potential defect monitoring method and system. The method comprises the following steps: establishing a data model containing primary equipment topological connection and secondary equipment association based on a data demand of potential defect monitoring; after the power grid trips, calling a fault recording file by uploading messages of multiple trigger sources, and detecting potential defects; determining a starting range for fault recording file calling based on the topological connection relation by taking the tripping equipment as a starting point; calling a fault recording file by adopting a priority queue and an increment retry mechanism in a range to be started; and analyzing the fault recording file, extracting analog quantity or switching value characteristics, and performing potential defect judgment based on a preset judgment condition. Potential defect analysis in multiple aspects of a sampling loop, an input and output loop, protection cooperation and the like can be carried out, so that the operation state of the device can be monitored, potential defect problems are found in time and eliminated in a targeted mode, and the influence range is prevented from being expanded after a power system breaks down.

This invention provides a protective relay device that can accurately detect CT wire breakage using a simple method. [Solution] The protective relay device includes a current acquisition unit that acquires a first instantaneous current value from a first current transformer and a second instantaneous current value from a second current transformer; a current differential relay unit that determines whether or not a fault has occurred in the protected object based on the operating amount and suppression amount calculated from the first instantaneous current value and the second instantaneous current value; and a wire break detection unit that determines that a wire break has occurred in the first current transformer when a specified condition is met. The wire break detection unit calculates the vector sum of the differential currents of each phase as the first vector, calculates the vector sum of the currents of each phase flowing to the first end as the second vector, and calculates the sum of the first vector and the inverse vector of the second vector as the third vector. The specified condition includes a first condition that the effective value of the third vector is less than a first threshold.

The present disclosure provides a battery control device, method and electric vehicle for the electric vehicle. The battery control device comprises a battery module, two charging circuits connected with the battery module, each charging circuit comprising a charging relay and a pair of charging ports connected in series, and a control module configured to: during the process that a first charging gun charges the battery module through the charging port of one charging circuit, when detecting that a second charging gun is connected with the charging port of the other charging circuit, first make the requested charging current of the battery module be 0, and then make the first charging gun and the second charging gun charge the battery module. The present disclosure can realize the single-gun charging function and the double-gun charging function, and can protect the performance of the relay during the switching from the single-gun charging mode to the double-gun charging mode.

[Problem] To provide a relay layout structure for an electric fan whereby a short circuit can be prevented to allow a relay to be placed in a fan shroud. [Solution] This relay layout structure for an electric fan comprises: a radiator 10; a fan shroud 30 provided on the vehicle-rear side of the radiator and supporting an electric fan 20; a relay 40 capable of switching the electric fan on and off; and a protector 50 protecting the relay. The relay has a case 41, a base 42 provided inside the case, and a resistor 43 provided outside the case and electrically connected to the base. The case is disposed on one side 30a of the fan shroud in the vehicle longitudinal direction, and is provided in an opening 31 of the fan shroud such that the resistor is disposed on the other side 30b of the fan shroud in the vehicle longitudinal direction. The protector is provided on the other side of the fan shroud and covers the resistor.