197results about "Electronic protection circuit testing" patented technology

Disclosed is a fault diagnosis device for diagnosing a fault in a bay Intelligent Electronic Device (IED) for a substation automation system, which includes an online IED diagnosis device and a backup IED. The online IED diagnosis device includes an IED selection unit, an IED switch unit, a fault diagnosis, and a result display unit. With reference to a Substation Configuration Description (SCD) file, the online IED diagnosis device designates an IED to be tested, and extracts backup information for the IED to be tested. A backup IED replaces the operation of the IED to be tested based on the extracted backup information. Further, the online IED diagnosis device determines the occurrence or non-occurrence of a fault in the IED to be tested by analyzing response information received in response to transmission of a test pattern to the IED to be tested.

A solid-state circuit breaker (SSCB) with self-diagnostic, self-maintenance, and self-protection capabilities includes: a power semiconductor device; an air gap disconnect unit connected in series with the power semiconductor device; a sense and drive circuit that switches the power semiconductor device OFF upon detecting a short circuit or overload of unacceptably long duration; and a microcontroller unit (MCU) that triggers the air gap disconnect unit to form an air gap and galvanically isolate an attached load, after the sense and drive circuit switches the power semiconductor device OFF. The MCU is further configured to monitor the operability of the air gap disconnect unit, the power semiconductor device, and other critical components of the SSCB and, when applicable, take corrective actions to prevent the SSCB and the connected load from being damaged or destroyed and/or to protect persons and the environment from being exposed to hazardous electrical conditions.

A software code operates with a circuit interrupting device having an auto-monitoring circuit including a controller for automatically testing various functions and structures of the device. The auto-monitoring circuit initiates the software code which includes an auto-monitoring routine which, among other things, establishes a self-test fault during the positive or negative half-wave of an AC power cycle and determines whether the detection mechanisms within the device properly detect the self-test fault. Moreover, the software code executed by the controller compares sensed voltages from test signals with a determined or set maximum voltage value and compares the sensed voltages with a set or determined minimum voltage value. The sensed voltages must be greater than the maximum voltage value or lower than the minimum voltage value for a predetermined number of counts before an end-of-life state is determined for the circuit interrupting device. The number of counts reduces the likelihood of false detections of error conditions by the auto-monitoring circuit when determining whether the circuit interrupting device has reached the end of its useful life.

A self-testing fault detector having a line side and a load side and a conductive path there between is provided. The self-testing fault detector includes an auto-monitoring circuit electrically coupled to a fault detection circuit and an interrupting device and it continuously monitors one or more signals to determine an operating state of the fault detector. At least one of the monitored signals includes a fault detection signal, wherein if said automonitoring circuit determines that the fault detection circuit is not properly driving the interrupting device, the automonitoring device converts an input-output port receiving the fault detection signal from an input to an output and drives the interrupting device into a tripped condition using the input-output port.

The present disclosure is directed to an automated apparatus and method for testing a crowbar circuit of power converter. The crowbar circuit includes an anti-parallel diode and a voltage-controlled switching element, e.g. a silicon-controlled rectifier (SCR). The method includes implementing a first test sequence for testing operability of the diode and a second test sequence for testing operability of the voltage-controlled switching element. More specifically, the first test sequence determines a first current-voltage feedback that is indicative of the operability of the diode and the second test sequence determines a second current-voltage feedback that is indicative of the operability of the voltage-controlled switching element.

A system comprises a battery including one or more cells, an energy source, a load, and a battery protection circuit coupled to the battery, the energy source and the load. The circuit determines if the charge of each cell is at/above a predetermined, band gap supplied threshold voltage, which results in disconnecting of the battery from the energy source. The circuit also may determine if the charge of any cell is at/below a second predetermined level, which may result in disconnecting of the battery from the load. The circuit may be radiation-hardened (e.g., via redundancy), through the use of two sets of field effect transistors, two logic gates, two groups of comparator circuits, and two relays. The circuit provides multiply redundant protection comprising: redundantly assessing the overvoltage determination; redundantly triggering battery isolation; and preventing inadvertent isolation and non-charging, occurring absent overvoltage, through redundant first and second relays.

Provided is a doubly-fed induction generator system and a self-test method for the active crowbar circuit of the doubly-fed induction generator system. The invention is featured by using the controller of the doubly-fed induction generator system to carry out a self-test procedure to detect the loop current of the active crowbar circuit for determining if the active crowbar circuit can be turned on and off normally. Also, the rotor-side converter and the active crowbar circuit of the doubly-fed induction generator system are forbidden to turn on simultaneously during the execution of the self-test procedure.

The invention relates to a high-voltage system (1) for a motor vehicle (26), comprising a high-voltage battery (2) that supplies at least one load (4), in particular an inverter (5), by means of lines (3), wherein at least one switching means (8, 9, 11) is provided in order to disconnect the high-voltage supply, a capacitor (7) connected in parallel with the load (4), and a discharge circuit (12) for discharging the capacitor (7), said discharge circuit having a discharge resistor (13) and a discharge switching means (14) that closes the discharge circuit, wherein a diagnostic device having a measuring device (16) for measuring a voltage course that describes the voltage course at the capacitor (7), in particular during the discharge process (17), and a control device (15) for evaluating said voltage course in regard to a malfunction of the high-voltage system (1) is provided.

Software code for operating a circuit interrupting device having an auto-monitoring circuit for automatically testing various functions and structures of the device. The auto-monitoring circuit initiates the software code which includes an auto-monitoring routine which, among other things, establishes a self-test fault during the positive or negative half-wave of an AC power cycle and determines whether the detection mechanisms within the device properly detect the self-test fault. An early detection signal indicates that the self-test fault was properly detected without interfering with the normal operation of the detection circuitry and without causing a false trip within the device. Additional functionality of the software code permits automatic verification that the device is properly wired, that is, not miswired, and determines whether the device has reached the end of its useful life.

The invention provides a high-voltage interlocking system and a detection method thereof, and relates to the technical field of electric power. In the high-voltage interlocking system, if it is determined that both the first constant power supply and the second constant power supply do not fail, the control module inputs a first driving signal to the source signal generation module, controls to output an alternating-current electric signal. If one of the first constant power supply and the second constant power supply is determined to have a fault, a second driving signal is input to the source signal generation module, a direct-current electric signal is controlled to be output, a detection result signal is received, and the fault of the high-voltage interlocking module is determined according to the detection result signal. The source signal generation module controls the first constant power supply and the second constant power supply to be alternately in a working state according to the first driving signal, and controls the power supply which does not fail to be in the working state continuously according to the second driving signal. The signal detection module outputs a detection result signal according to the electric signal of the detection resistor set. By means of the technical scheme, the reliability of the high-voltage interlocking system can be improved.

The invention discloses a fault inversion-based extra-high voltage direct-current protection device and system. The method includes the following steps that: S1, the historical fault information of adirect-current transmission system is acquired and synchronized; S2, corresponding fault inversion configuration information is determined: a protection measurement point table, a control and protection information point table and a protection constant value table are established; S3, a protection function type to be tested is selected; S4, test quantity data under a corresponding fault operationstate and direct-current control system control information data are generated based on the fault inversion configuration information according to the protection function type to be tested, and the test quantity data and direct-current control system control information data are transmitted to an extra-high voltage direct-current protection device to be tested; S5, protection logic operation and pre-judgment are performed to obtain the theoretical action behavior data of the direct-current protection device to be tested; S6, the actual action behavior data of the protection device to be testedare obtained; and S7, the actual action behavior data are compared with the theoretical action behavior data, so that the whether the corresponding protection function of the direct-current protection device to be test meets requirements can be judged. With the fault inversion-based extra-high voltage direct-current protection device and system of the invention adopted, the extra-high voltage direct-current protection device can be independently and effectively tested, and a guarantee can be provided for the long-term safe and stable operation of the direct-current protection system.

A lightning protection circuit includes a first lightning protection branch including at least one transient voltage suppression (TVS) protection element, and a testing element integral to the lightning protection circuit. The testing element is operable to test a functionality of the lightning protection circuit while he lightning protection circuit is installed in an electronic control system. A controller is connected to the testing element, such that the controller receives sensed signals from the testing element.

The invention provides a high-voltage interlocking circuit and a detection method thereof, and relates to the technical field of electric power. The high-voltage interlocking circuit comprises: an alternating current signal source module is connected with a detection resistor set and a high-voltage interlocking module, and the alternating current signal source module is used for outputting an alternating current signal. The detection resistor set is connected with the signal detection module and the high-voltage interlocking module. The signal detection module is used for collecting electric signals of the detection resistor set and outputting detection result signals according to the collected electric signals of the detection resistor set. The control module is connected with the alternating current signal source module and the signal detection module, and the control module is used for controlling the alternating current signal source module to output alternating current signals, obtaining detection result signals and determining faults of the high-voltage interlocking module according to the detection result signals. By utilizing the technical scheme of the invention, the positioning of the fault reason of high-voltage interlocking can be realized.

Embodiments are directed to a transient protection circuit configured for use in a SSPC having a plurality of power channels. The transient protection circuit includes a shared transient voltage suppressor, and a shared protection line communicatively coupled to the shared transient voltage suppressor. The shared protection line is configured to be communicatively coupled to and shared by the plurality of power channels. When the shared protection line is communicatively coupled to and shared by the plurality of power channels, energy above a threshold on any one of the plurality of power channels is dissipated through the shared protection line and the shared transient voltage suppressor.

The present invention discloses a self-checking method and a device for the active short-circuit protection circuit of a motor control system. The self-checking method for the active short-circuit protection circuit comprises the steps of controlling a multi-phase bridge type circuit, wherein an upper half-bridge corresponding to a first-phase winding and a lower half-bridge corresponding to a second-phase winding are switched on, while all other phase windings are not switched on; sampling the current of each phase winding multiple times, and conducting the split-phase accumulation; if the current cumulative sum of the above two correspondingly switched-on phase windings meets an approximation condition and the current cumulative sum of all the other phase windings is approximately zero, conducting the next detection until all upper and lower half-bridges of the multi-phase bridge type circuit are already detected once; if the current cumulative sum of the above two correspondingly switched-on phase windings meets the approximation condition, passing the self-checking of the active short-circuit protection circuit. Based on the method and the device, circuit faults can be actively precluded. Therefore, the IGBT burnout condition of the motor and the controller of a finished automobile due to circuit faults can be prevented. Meanwhile, no external circuit is added, so that the cost is saved. The power-on time of the finished automobile is saved.

A ground fault circuit interrupter device includes a switch module having a reset switch, a control switch mechanically linked to the reset switch, a ground fault detection module, a self-testing module and a tripping module. The switch module controls the electrical connection between the input and output ends of the device. The ground fault detection module detects a leakage current signal at the output end. The self-testing module is coupled to the ground fault detection module and periodically generates a self-test pulse signal which simulates the leakage current signal. The tripping module is electrically coupled to the ground fault detection module and mechanically coupled to the switch module and the control switch, to control the movement of the switch module and the control switch. The control switch, which opens and closes at the same time as the reset switch, controls the power supply to the self-testing module.

The invention relates to an unmanned aerial device for performing a resistance, current and/or voltage measurement at an object, in particular a lightning protection measurement at a wind turbine, comprising a contact element with an electrically conductive contact area, which can be brought into contact with a surface of the object, in particular with a lightning protection receptor of a rotor blade, of a nacelle or of a tower of a wind turbine, and comprising an electrically conductive measurement cable, which, with a first end, is connected in an electrically conductive manner to the contact area, and, with a second end, can be connected to a resistance, current and/or voltage measuring device and/or a grounding contact of the object.

A distributed safety monitoring system is provided with a first safety loop for connecting safety relays in series to a common power supply. The opening of any one of the safety relays can be detected by a current detector located in the safety loop. Each safety relay is part of a local safety monitoring device, which is provided with a local power supply and a test circuit, to allow local testing of the safety relay independently from the common power supply. Hence, the safety relays can be tested simultaneously.

The invention discloses a method and a device for detecting a state of an overcurrent protector of a battery. The method comprises the following steps of: acquiring voltage Uout of a power supply source, and voltage Ubat of the battery connected with the power supply source via the overcurrent protector, and calculating U, wherein U is equal to the absolute value of Uout minus Ubat; when U is more than or equal to UL and less than or equal to UH, and the absolute value of Ibat is less than or equal to Imin, adjusting the voltage of the power supply source to be U'out, wherein UL is the minimum value of a difference value between the voltage of the power supply source and the voltage of the battery, UH is the maximum value of the difference value between the voltage of the power supply source and the voltage of the battery, Ibat is a current value of the battery and Imin is a current detection precision value of equipment for detecting the current of the battery; acquiring the voltage of the battery U'bat after the voltage of the power supply source is adjusted, and calculating U', wherein U' is equal to an absolute value of U'out minus U'bat; and judging the state of the overcurrent protector of the battery according to a relation of U' and UH. By the invention, in case of a smaller difference value between the voltage of the battery and the voltage of the power supply, the state of the overcurrent protector of the battery can be precisely detected by adjusting the voltage of the power supply and comparing the difference value between the voltage at two ends of the overcurrent protector again, and the detection cost can be lowered.

The invention relates to a transformer station routine distributed line protective device test method, and suitable for a 66kV transformer station routine distribution station; the method comprises astep of AC loop detection: input contact detection; and a step of total group test: joint debugging the device and a monitoring backstage; the advantages are that the method can carry out the routinedistributed line protective device test work in each total drop transformer station in the power supply work areas in a more vivid mode with more pertinency and references, thus effectively preventingcertain function failure or missing hidden troubles, caused by rough tests, of the transformer station routine distributed line protective device, and preventing severe results and unnecessary losses.

The invention provides a noise generation circuit, a self-check circuit, an AFCI and a photovoltaic power generation system. The noise generation circuit comprises a power switch module, a noise generator and a capacitor; the noise generator is connected with the power switch module and the capacitor; the power switch module controls the noise generator to or not to generate a noise signal according to a self-check instruction; and the capacitor filters DC components from the noise signal when the noise generator generates the noise signal. According to the invention, noise signals are not generated beyond the self-check time, influence on the AFCI in the working state as well as on devices in a photovoltaic inverter in which the AFCI is arranged can be avoided, and normal work of the AFCI and the photovoltaic inverter are ensured.

The invention discloses a cutoff device and cutoff method for preventing electrification of primary equipment during relay protection debugging of a substation, and solves the problem of electrification by mistake of the primary equipment during the relay protection debugging of the substation. A closed detection loop comprises a detection circuit microprocessor (20), a voltage relay normally-open contact (14) and a detection circuit power supply (19), a current relay normally-closed contact (26) is connected in series to a connection line between a relay protection tester (9) and a relay protection tester external power supply (29), a cutoff circuit power supply (28), a current relay coil (25) and a triode switch (24) are connected in series to form a cutoff loop, an output control end of a cutoff circuit microprocessor (23) is connected to a base of the triode switch (24), and a cutoff signal is used for controlling the triode switch (24) to be conducted and the current relay normally-closed contact (26) to be disconnected by the cutoff circuit microprocessor (23).

A circuit protective system. The system has: (i) an input for sensing an operational voltage responsive to a current flowing through a transistor; (ii) circuitry for applying a forced voltage at the input; (iii) voltage-to-current conversion circuitry for outputting a reference current in response to the forced voltage at the input; (iv) circuitry for providing a reference trim current in response to a trim indicator; and (v) comparison circuitry for outputting a limit signal in response to a comparison of the reference current and the reference trim current.

Systems and methods for auto-monitoring a trip solenoid and a switching semiconductor in a circuit breaker comprises determining whether the trip solenoid or the switching semiconductor is open-circuited or otherwise non-operational. The trip solenoid has multiple windings therein and the switching semiconductor has multiple semiconductor switches therein. The circuit breaker automatically performs a designated action if one of the multiple windings or one of the semiconductor switches is determined to be open-circuited or otherwise non-operational. In some embodiments, the circuit breaker is a miniature circuit breaker.