50results about "Arrangements responsive to underload" patented technology

The invention relates to the technical field of protection circuits, and discloses an electric leakage protection circuit, electrical equipment and an electric leakage protection method.The electric leakage protection circuit comprises an electric leakage detection switch; the voltage detection unit is configured to detect the input voltage of the power supply end so as to generate a voltage detection signal; the driving unit is configured to determine the input voltage type of the power supply end according to the voltage detection signal; the threshold value generation unit is configured to generate a leakage protection threshold value according to the input voltage type; and the electric leakage protection unit is configured to detect the working current flowing through the electric leakage detection switch and control the load to be in an off state under the condition of judging that the electric leakage phenomenon exists. According to the invention, corresponding electric leakage detection protection can be carried out by detecting different input voltage types, the application scene is expanded, the accuracy and reliability of electric leakage protection under different voltage input conditions can be ensured, and the requirement of users for safe electricity utilization is fully met.

The invention discloses a control method for under-voltage tripping and voltage detection closing for a low-voltage switch, and relates to the technical field of power distribution automation. The problems of function separation, low detection precision, poor anti-interference capability and inconvenient maintenance in the prior art are solved. The method comprises the following steps: S1, acquiring a high-precision digital voltage through a voltage transformer, a voltage division network, an isolation amplifier and a 24-bit delta sigma ADC; s2, interference is suppressed by combining temperature compensation, FIR filtering, median filtering and an oversampling integration algorithm; s3, comparing the real-time voltage with a tripping / closing threshold value which can be configured online in parallel; s4 / S5, triggering a zero-crossing short pulse to drive opening / closing based on the threshold value and the time delay; s6, performing parallel fault monitoring, shielding misoperation and uploading fault data; according to the invention, the detection precision, the anti-interference capability and the operation and maintenance efficiency of the system are obviously improved.

A power distribution monitoring system (100) is provided that can include a number of features. The system can include a plurality of monitoring devices configured to attach to conductor(s) on a power grid distribution network. In some embodiments, a monitoring device is disposed on each conductor of a three-phase network and utilizes a complex platform of software and hardware to detect faults and disturbances that can be analyzed to determine or predict the risk of wildfires.

A power loss protection circuit includes: a first input terminal configured to receive, as an input voltage, a voltage generated by an intermediate bus converter configured to step down a DC bus voltage; a second input terminal configured to receive the DC bus voltage; a capacitor connection terminal to which an external capacitor is to be connected; an output terminal to which a load is to be connected; a first switch connected between the first input terminal and the output terminal; a charging circuit connected between the second input terminal and the capacitor connection terminal; and an internal converter configured to step down a voltage of the capacitor connection terminal and stabilize an output voltage generated at the output terminal to a target level.

An electronic device is provided. The electronic device includes a housing, a first printed circuit board disposed inside the housing and including a first antenna, a first connector connected to the first antenna, a second antenna, and a second connector connected to the second antenna, memory storing one or more computer programs, a second printed circuit board spaced apart from the first printed circuit board inside the housing and including a power management circuit, a third connector electrically connected to the first connector, a fourth connector electrically connected to the second connector, a first detection circuit, and one or more processors communicatively coupled to the first detection circuit and the memory, a first cable electrically connecting the first connector and the third connector, and a second cable electrically connecting the second connector and the fourth connector, wherein the first detection circuit includes a first resistor disposed between the one or more processors and the power management circuit, and the first printed circuit board includes a second resistor branched between the first antenna and the first connector and electrically connected to the ground, and a third resistor branched between the second antenna and the second connector and electrically connected to the ground.

The invention relates to a protective circuit breaker for protection of an electrical low-voltage circuit, comprising: - a housing with at least one grid-side connection and at least one load-side connection, and - a mechanical separating contact unit which is connected to an electronic interrupter unit in series, wherein - the serial connection is connected to the at least one grid-side connection and to the at least one load-side connection, - the mechanical separating contact unit can be switched by opening contacts in order to prevent a current flow or by closing the contacts for a current flow in the low-voltage circuit, - owing to the semiconductor-based switch elements, the electronic interrupter unit can be switched to a high-ohmic state of the switch elements in order to prevent a current flow or to a low-ohmic state of the switch elements for a current flow in the low-voltage circuit, - the level of the current in the low-voltage circuit, in particular between the grid-side phase conductor connection and the load-side phase conductor connection, is ascertained, - a process for preventing a current flow in the low-voltage circuit is initiated if current thresholds and / or current / time thresholds are exceeded, and - while the contacts of the mechanical separating contact unit are closed and the electronic interrupter unit is switched to a low-ohmic state, the electronic interrupter unit is switched to a high-ohmic state if the current of the low-voltage circuit reaches a level that falls below a first current threshold for a first duration of time.

The invention relates to a device for protecting an electrical circuit coupled to a power supply network, in particular a vehicle power supply network, from overvoltage, comprising: an electrical input for applying an input voltage; an electrical output for providing an output voltage to a power supply network or a connected circuit; and an electrical protection circuit having a detection section, a semiconductor switch and a limiting section, the semiconductor switch being arranged between the electrical input and the electrical output and being actuatable in such a way that the output voltage output at the electrical output can be interrupted, wherein the detection section is configured to actuate the semiconductor switch by means of an actuation voltage when a threshold value of the input voltage is reached in such a way that the output of the output voltage is interrupted, the detection section having a voltage threshold detection element, such as a Zener diode, and wherein the limit section is configured to limit the output voltage when the output voltage is interrupted. The control voltage for the semiconductor switch is limited.

The utility model discloses a resettable voltage protection switch, which relates to the field of power distribution and power utilization technical equipment of an electric power system and comprises a sensor, a voltage detection module, a voltage detection module and a voltage detection module, and is characterized in that the sensor is used for collecting current data and voltage data on a power grid line; the controller is embedded in the self-recovery voltage protection switch, is connected with the sensor, and is used for sending a switching-off signal to the switching-off assembly or sending a switching-on signal to the switching-on assembly based on the current data and the voltage data; a switching-off assembly which is installed in the self-recovery voltage protection switch in an embedded manner, is connected with the controller, and is used for carrying out switching-off processing after receiving a switching-off signal sent by the controller; and the closing assembly is embedded in the self-recovery voltage protection switch, is connected with the controller, and is used for performing closing processing after receiving the closing signal sent by the controller. According to the utility model, the technical problem of low power supply reliability caused by the fact that the low-voltage switch in the prior art cannot automatically restore power after the fault of the power grid line disappears is solved.

The invention discloses a GOOSE communication line protection method and equipment of a measurement and control device and a medium, and the method comprises the steps: obtaining a GOOSE communication line, and synchronizing the sampling period of a GOOSE communication line channel; setting a GOOSE communication line channel identification code, and performing channel connection response according to the identification code; monitoring the connected GOOSE communication line, and determining the fault type of the GOOSE communication line; and determining the protection type of the GOOSE communication line according to the fault type. By synchronizing sampling periods of GOOSE communication line channels, accuracy of data on two sides is guaranteed, GOOSE communication line channel identification codes are set, channel connection response is carried out according to the identification codes, the position of a fault point can be rapidly and accurately determined, a tripping signal is sent to the position closest to the fault point, the override tripping phenomenon is effectively prevented, and the reliability of the system is improved. And the protection type of the GOOSE communication line is determined according to the fault type, so that accurate protection can be realized, the influence of the fault on the whole power supply system is reduced, and the continuity and reliability of power supply are ensured.

The present disclosure relates to systems and methods to detect a fault in an electric power system. One embodiment may detect a single phase broken conductor in a multi-phase electric power system. An intelligent electronic device (IED) may receive a plurality of measurements over time of a current through an electrical conductor in the electric power system. Based on the measurements of the current, a fault detection subsystem may determine a zero-sequence current, a negative-sequence current, and a positive-sequence current. The fault detection subsystem may determine a ratio of the zero-sequence current, the negative-sequence current, and the positive-sequence current, and may monitor the ratio over time. The fault detection subsystem may identify the broken conductor condition based on the ratio and a fault detection region. A protective action subsystem may implement a protective action based on identification of the broken conductor condition.

Systems and methods for operating a PEM including control circuitry are provided herein. The operation includes detecting, using the control circuitry, a drop in output current of the PEM, detecting, using the control circuitry, an increase in output voltage of the PEM, and in response to detecting the drop in output current and detecting the increase in output voltage, turning off the PEM using the control circuitry. Turning off the PEM may protect circuitry of the PEM from an interruption of a continuous power flow.

To provide an abnormality detection circuit that can realize miniaturization and cost reduction.SOLUTION: An abnormality detection circuit 35 includes: a first current source CS11 configured to generate a first current flowing from an external terminal 11 toward a reference potential terminal; a second current source CS12 configured to generate a second current flowing from a power supply potential terminal VDD toward the external terminal 11; a comparator CMP1 configured to generate an abnormality detection signal S35 by comparing a detection voltage V11 corresponding to an application voltage of the external terminal 11 with a predetermined threshold voltage V12; and a controller CTL1 configured to switch between a first abnormality detection mode in which an operation of generating the first current is performed and a second abnormality detection mode in which an operation of generating the second current is performed.SELECTED DRAWING: Figure 2

Systems, methods, and devices presented herein are directed toward detecting a secondary arc extinction (SAE). SAE detection circuitry may identify the presence of arcing and bolted faults that persist through the end of a dead time (e.g., a predetermined time period between detection of a secondary arc and auto-reclosing). The SAE detection circuitry may detect the extinction of secondary arcing prior to the dead time expiring and provide output signals that may enable reclosing prior to the expiration of the dead time when secondary arc extinction is detected or to block reclosing when the secondary arc is still present at the end of the dead time. Further, the SAE detection circuitry may be implemented for transposed, untransposed, compensated, and uncompensated lines.

Electronic controller comprising: —a power supply (11) connectable to a power supply network (12); —at least one connector (13a, 13b, 13c) adapted to be connected to a load (14a, 14b, 14c) in order to supply it; —a microcontroller (15) connected to the power supply (11) and to the at least one connector (13a, 13b, 13c) in order to apply to the latter a supply voltage in a controlled manner; —at least one detection device (16a, 16b, 16c, 16d) configured to detect a current flow through the connector (13a, 13b, 13c). The microcontroller (15) is connected to the detection device (16a, 16b, 16c, 16d) and is configured to zero the supply voltage if, following application of the supply voltage, the detection device (16a, 16b, 16c, 16d) does not detect a current flow through the connector (13a, 13b, 13c).

To provide a PLP circuit 200 suitable for a system supplied with a high bus voltage.SOLUTION: A first input terminal in receives, as an input voltage VIN, a voltage generated by an intermediate bus converter 40, which steps down a DC bus voltage VBUS. A second input terminal bus receives the DC bus voltage VBUS. A capacitor connection terminal STR is connected to an external backup capacitor 102. A first switch SW1 is connected between the first input terminal in and an output terminal out. A charging circuit 110 is connected between the second input terminal bus and the capacitor connection terminal STR. An internal converter 120 steps up or down the voltage VSTR at the capacitor connection terminal STR, and stabilizes the output voltage Vout generated at the output terminal out to a target level.SELECTED DRAWING: Figure 2

The present disclosure relates to systems and methods to detect a fault in an electric power system. One embodiment may detect a single phase broken conductor in a multi-phase electric power system. An intelligent electronic device (IED) may receive a plurality of measurements over time of a current through an electrical conductor in the electric power system. Based on the measurements of the current, a fault detection subsystem may determine a zero-sequence current, a negative-sequence current, and a positive-sequence current. The fault detection subsystem may determine a ratio of the zero-sequence current, the negative-sequence current, and the positive-sequence current, and may monitor the ratio over time. The fault detection subsystem may identify the broken conductor condition based on the ratio and a fault detection region. A protective action subsystem may implement a protective action based on identification of the broken conductor condition.

The invention provides a no-load protection circuit controlled in a hysteresis current mode and a control method of the no-load protection circuit. The no-load protection circuit comprises an MOSFET and a current detection resistor. The inverting input end of the hysteresis operational amplifier is connected to the voltage detection point of the current detection resistor, the non-inverting input end of the hysteresis operational amplifier is connected to the output end of the error amplifier, and the output end of the hysteresis operational amplifier is connected to the grid electrode of the MOSFET; the non-inverting input end of the error amplifier is connected to a reference voltage, the inverting input end of the error amplifier is connected to a feedback voltage, and the output end of the error amplifier is connected to the non-inverting input end of the hysteresis operational amplifier and connected to the compensation capacitor; one end of the compensation capacitor is connected to the output end of the error amplifier, and the other end is grounded; the feedback resistor is connected in series between the output voltage and the ground and is used for dividing the output voltage to obtain feedback voltage; the hysteresis voltage and the compensation voltage are compared through the hysteresis operational amplifier, the on-off state of the MOSFET is controlled, transmission of input energy is adjusted, and stability and no-load protection of the output voltage are achieved.

The invention discloses an input protection circuit based on voltage detection and an air conditioning unit, and the input protection circuit based on voltage detection comprises a rectifier bridge connected with a three-phase power supply. The input end of the voltage detection module is connected between the three-phase power supply and the rectifier bridge, the judgment module is connected to the output end of the voltage detection module, and the judgment module judges whether the three-phase power supply is open-phase or reverse-phase according to the output of the voltage detection module. Compared with the prior art, the voltage detection module can be used for judging the voltage of the diode of the lower bridge arm of the rectifier bridge, judging the conduction condition of the diode of the lower bridge arm, analyzing the conduction condition and judging whether the three-phase power supply has abnormal conditions such as phase loss, phase inversion and overvoltage or not, so that the operation reliability of the air conditioning unit is ensured; and the controller is prevented from being damaged.

A respiratory apparatus (4000) includes components to protect operations of the apparatus. In some examples, the apparatus may include a fault mitigation integrated circuit (IC). The IC circuit may be included in the respiratory apparatus to detect one or more faults based on physical and system parameters of the apparatus. The fault mitigation integrated circuit may generate a signal to stop the motor based on the detected fault, and may digitally communicate with a processor information about the detected fault. The system may be configured to provide multiple sensor or detector signals to a common port or pin of the fault mitigation integrated circuit to share fault detection resources of the fault mitigation integrated circuit for different fault detections.

A switched capacitor bank assembly including a first capacitor, a first switch selectively connected between the first capacitor and a first phase line, and a first voltage sensor integrated within a housing of the first switch and configured to sense a voltage of the first phase line. The assembly further includes a controller including an electronic processor, the controller operably coupled to the first voltage sensor and the first switch. The first capacitor, the first switch, the first voltage sensor, and the controller are physically supported by a frame of the switched capacitor bank assembly.

The utility model discloses power supply equipment with a protection function. The power supply equipment comprises a power supply input circuit and an output protection circuit, one end of the power supply input circuit is connected with commercial power, the other end of the power supply input circuit is connected with the output protection circuit, and the output protection circuit is connected with a load; the power supply input circuit comprises an isolation transformation circuit and a power supply circuit; one end of the isolation transformation circuit is connected with commercial power, the other end of the isolation transformation circuit is respectively connected with the power supply circuit and the output protection circuit, and the power supply circuit is connected with the output protection circuit. According to the utility model, the technical problem of how to instantly judge the load state and control the on-off of the relay according to the load state so as to guarantee the circuit safety is solved.

Vehicle power supply network comprising means of protection against thermoelectric risk. The invention relates to a vehicle power supply network (1), comprising: - a power source (2), - distribution boxes (12, 13, 14) electrically connected to the power source (2) and comprising electronic switching components (Cl1, Cl2, Cl3, C1, C2, C3, T4, T5, T6, Cn) upstream of electrical consumers (A11, A12, E11, E12, L11, L12), the power supply network (1) comprising a monitoring device (122, 132, 142) for a measurement related to the use of one of the electronic switching components (C1, C2, T4, T5, T6) located upstream of one of the electrical consumers (A12, E12, L12), the measurement being distinct from a current measurement or temperature, the monitoring device (122, 132, 142) being capable of cutting off the power supply to the electrical consumer (A12, E12,L12) as soon as the measurement data exceeds a predetermined threshold. (Figure 1)

The utility model provides an overvoltage and undervoltage protection circuit and an overvoltage and undervoltage protector, and relates to the technical field of circuit protection. The overvoltage and undervoltage protection circuit provided by the utility model comprises a main processing module, a key detection module and a nixie tube module, the main processing module is used for acquiring an input voltage signal, a preset overvoltage value and a preset undervoltage value; the key detection module is connected with the main processing module and is used for generating a key signal in response to the switch-on condition of a circuit corresponding to a key on the overvoltage and undervoltage protector and transmitting the key signal to the main processing module, and the main processing module is also used for executing a response action according to the key signal and generating a response action signal; and the main processing module is connected with the nixie tube module and is used for transmitting the response action signal to the nixie tube module, so that the nixie tube module displays the response action signal. The overvoltage and undervoltage protector can solve the problem that an existing overvoltage and undervoltage protector can only carry out overvoltage and undervoltage protection on a circuit in a fixed voltage interval and lacks flexibility.

The present invention relates to a technology for preventing electrical disasters by detecting abnormal signs of a power grid in advance by measuring characteristics of a line such as electric power loss and line resistance of the line. The present invention detects abnormal signs of a fire that can occur in a distribution power network by using a communication technology such as Internet of Things (IoT) technology to measure physical quantities of a line at all times in a live state at a power supply end and a load end, thereby indirectly measuring electric power loss on the line and line resistance that is a cause thereof, detecting defects of the line, and thereby detecting a fire sign.

Methods and devices are provided for determining whether a phase is faulted or one or more phases are open in capacitor bank system. Detecting open and faulted phases may include determining a neutral current of the capacitor bank system. An open-phase event and a fault event may be distinguished based on a magnitude of a neutral current within a first or a second predetermined range. According to one embodiment, an IED may calculate an aggregate power phasor for the phases of the capacitor bank system with respect to each rotation. According to another detection method, in response to the magnitude of the neutral current being greater than a threshold value, an IED may calculate an individual power phasor for each of the phases of the capacitor bank system with respect to each rotation. Based on the angles of the power phases, the IED may determine which phases may be faulted.

A device for protecting a circuit that is connected to a power supply system from overvoltage, the device comprising an electrical input, an electrical output, and an electrical protective circuit including a detection section, a semiconductor switch and a limiting section, wherein the semiconductor switch is arranged between the electrical input and the electrical output, wherein the detection section is configured to activate the semiconductor switch using an activation voltage such that an output of the output voltage is interrupted when the input voltage reaches a threshold value; wherein the detection section includes a voltage threshold detector element configured to determine when the input voltage reaches the threshold value; wherein the limiting section is configured to limit the activation voltage when the output voltage is interrupted; and wherein the detection section includes a component configured to limit a current flowing through the voltage threshold detector element.

An electrical receptacle including an outlet and a testing circuit. The outlet is configured to connect to an external load. The outlet includes a phase line and a neutral line. The testing circuit is configured to output a signal to a phase line of the outlet, receive a response signal from a neutral line of the outlet, and determine when the external load is electrically connected to the outlet based on the response signal.

The invention provides a power supply control system and a power supply control method.The system comprises a scanner assembly, an articulated arm assembly, a power supply control module and a state detection module connected with the power supply control module, the power supply control module is connected with power voltage, and the state detection module is deployed in the articulated arm assembly; the scanner assembly is detachably connected with the articulated arm assembly; the state detection module is used for determining whether to generate a power supply trigger signal or not according to the working state of the articulated arm assembly and the connection state of the scanner assembly and the articulated arm assembly; if yes, the state detection module is further used for generating a power supply trigger signal and sending the power supply trigger signal to the power supply control module; the power supply control module is used for supplying power to the scanner assembly according to the power supply trigger signal and the power supply voltage, thereby improving the power supply safety of the scanner assembly.