2721 results about "Grounding line" patented technology

A waveguide includes a waveguide body which is hollow inside and made from a shape-retentive material, and a conductive inner coating layer which is electrically conductive and provided on an inner surface of the waveguide body. The waveguide uses an inner space of the conductive inner coating layer as a transmission path to transmit electromagnetic waves as signals. Two electric wires provided along the outer surface of the waveguide body serve respectively as a power line and a ground line to transmit electric power.

Display apparatus with reduced susceptibility to electro-magnetic interference includes a display including an array of pixels and a ground mesh located in proximity to the display. The ground mesh includes a plurality of electrically connected ground lines located between the pixels, so that electro-magnetic radiation emitted or received by the display is reduced.

A vehicle includes a charging inlet for connection with a ground line and a pair of power lines used to charge an electrical storage device from outside the vehicle; a terminal of the charging inlet for connection with the ground line; and a GND relay that connects the terminal to a body earth of the vehicle. Desirably, the vehicle further includes an ECU that controls charging of the electrical storage device. Before charging of the electrical storage device is started after the pair of power lines and the ground line are connected to the charging inlet, the ECU opens the GND relay and then determines whether there is a disconnection in the ground line.

The invention relates to a detection system and a detection method for single-phase grounding fault line selection in a small current grounding system. The system comprises a load switching device and a small current grounding line selection device, the load switching device comprises a load, a switching switch, a controller and a sampling device, the load is connected with the switching switch in series and further connected with an arc suppression coil in parallel, and the controller is respectively connected with the switching switch and the sampling device; the small current grounding line selection device is connected with each circuit in the small current grounding system, and the small current grounding line selection device is further connected with the controller in the load switching device. The system and the method can effectively solve the problem of difficulty in line selection of single-phase grounding fault in the small current grounding system, and improve the accuracy of line selection.

An electric motor (10) has a field pole formed by a field current passing through a field winding (50). A voltage booting converter (120) converts output voltage of a battery (B) and outputs the voltage between a power source line (107) and a grounding line (105). Field winding (50) is electrically connected onto an electric current channel between battery (B) and power source line (107) and formed so that voltage switched by a switching element (Q1) is applied to both ends. A controller (100) controls the field current so as to adjust density of magnetic flux between a rotor and a stator by performing switching control on switching element (Q1) and a switching element (Q3) connected in parallel to field winding (50) and converts the output voltage of battery (B) into voltage in accordance with a voltage command value.

A display panel and a method of forming a display panel are described. The display panel may include a thin film transistor substrate including a pixel area and a non-pixel area. The pixel area includes an array of bank openings and an array of bottom electrodes within the array of bank openings. A ground line is located in the non-pixel area and an array of ground tie lines run between the bank openings in the pixel area and are electrically connected to the ground line in the non-pixel area.

The invention provides an antenna device. The antenna device comprises a radio frequency receiving and transmitting circuit, a match circuit electrically connected to the radio frequency receiving and transmitting circuit and a metal shell; the metal shell is provided with at least one micro gap tape, and the radio frequency receiving and transmitting circuit is electrically connected with the metal shell through the match circuit, so that the metal shell is used as a radiating body of the antenna device; the metal shell is grounded through a grounding wire, and the grounding wire is provided with a switch used for controlling on-off of the grounding wire. According to the antenna device, the overall appearance effect of a mobile terminal can be guaranteed, signals of the antenna device can be prevented from being interfered, and the bandwidth of the antenna device can be increased. The invention further provides the mobile terminal.

The invention discloses an electric equipment abnormal heating detection method based on infrared inspection video data of power line inspection. The method comprises the following steps: an infrared video is used to capture the electric equipment to get an infrared sequence image frame of the electric equipment; an image is pre-processed; the pre-processed image is classified; an electric tower sequence image undergoes image segmentation so that images of an electric tower body, an insulator, a grounding line and electric tower fittings are segmented from the electric tower sequence image; the electric tower body, the insulator, the grounding line and the electric tower fittings in the image are extracted and positioned; insulator, grounding and the electric tower fittings; the electric tower body, the insulator, the grounding line and the electric tower fittings are diagnosed to obtain a fault diagnosis result; temperature outliers are marked out; and a fault diagnosis result report is generated according to the fault diagnosis results for human auxiliary judgment. The method of the invention does not need too much threshold setting, and is high in automation degree and high in efficiency.

The invention discloses an electric leakage protecting device with an arc detection function, and electric power consumption equipment. The electric leakage protecting device is provided with a power circuit, a controller, a switching circuit, an electric leakage detecting circuit, a series arc detecting circuit and a parallel arc detecting circuit. The controller detects the electric leakage fault and the arc fault of an AC input power supply through the electric leakage detecting circuit, the series arc detecting circuit and the parallel arc detecting circuit; and furthermore when a random fault is detected, the controller makes the switching circuit switch off an AC power supply line between the AC input power supply and an AC load, thereby performing fault protection. The electric leakage protecting device can realize the following functions on the electric power consumption equipment: live detection on a housing and a ground line, reverse-direction connection detection on a live line and the ground line, and detection protection for abnormities such as series arc and parallel arc. The electric leakage protecting device has advantages of realizing comprehensive protection for electric power consumption safety of the electric power consumption equipment, settling a problem of error power-off on the electric power consumption equipment caused by malfunction of an existing electric leakage protecting product, and remarkably improving operation reliability of the electric power consumption equipment.

The invention discloses a fault diagnosis comprehensive positioning method for an intelligent distribution network, and belongs to the field of fault monitoring. Based on a fault indicator, a wirelesscommunication technology and a ground fault line selection technology, the method comprises the following steps: monitoring zero-sequence voltage of a transformer neutral point in real time, startingzero-sequence fault diagnosis when detecting that a zero-sequence voltage change value exceeds a preset value, and identifying whether the zero-sequence voltage change value is a single-phase grounding fault; if the zero-sequence voltage change value is single-phase grounding fault, performing grounding line selection through a fault diagnosis device in a station, and positioning the grounding fault on a certain phase of a certain line; when the single-phase earth fault is judged to be a stable fault, recalling the real-time current data of the fault indicators on the fault phase line, comparing the signals collected by the fault indicators, comparing the difference of the real-time current data before and after a fault point, judging the two fault indicators with abrupt changes, and thendetermining the specific section of the fault. The method can be widely applied to the field of power distribution network operation fault monitoring and positioning.

Plural communication areas are provided, and plural electronic control units for mutually making communication in each of the communication areas are provided. A vehicular power line communication system includes a power line coupling the respective communication areas to one another, branch power lines coupling the respective electronic control units in each of the communication areas to one another, and a battery for supplying electric power to the electronic control units through the power line and the branch power lines. The power line is formed of a +B line turning to a positive polarity and a ground line turning to a negative polarity, which are cabled to be spaced from each other in a part of the power line. The branch power lines superpose communication data thereon, thereby making data communication.

The invention provides an antenna system which comprises a system ground unit, a metal back casing, a frame serving as an antenna radiator, a grounding line, a feeder line and a tuning switch. The antenna radiator comprises a main radiator and a sub-radiator. The main radiator comprises a first main radiator which forms a first main slit with the metal back casing, a second main radiator which extends from the first main radiator and forms a second main slit with the metal back casing, and a first fracture which divides the first main radiator into two parts. The sub-radiator comprises a first sub-radiator which forms a first sub-slit with the metal back casing, a second sub-radiator which extends from the first sub-radiator and forms a second sub-slit with the metal back casing, and a second fracture which divides the first sub-radiator into two parts. Compared with the related art, the antenna system provided by the invention has the advantages of wide frequency band, high efficiency and good overall appearance.

The invention discloses a temporary bridge covered excavation method for constructing a box culvert below a traffic ground line of an operating track, which comprises the following steps of: constructing supporting piles and pile top beams at two sides of the existing line, temporarily removing the line, and constructing prestressed concrete box type beams on the top beams to form a temporary bridge supporting system to be used as a temporary supporting structure of the line; and then, recovering the line, excavating soil bodies at the lower part step by step under the protection of the temporary bridge supporting system, and casting the box culvert structure in the field section by section. In the construction process of the box culvert, stress conversion of the supporting piles needs to be carried out, partial supporting piles are removed to enable the box culvert to become the supporting structure of the line, and the top beams and the constructing prestressed concrete box type beams are reserved for the permanent supporting structure of the line, thereby reducing the influence of construction on the operation of the traffic line of the existing track.

The invention relates to the field of single-phase grounding fault detection for a distribution network of an electric power system, and particularly relates to a line selection method for a different-phase two-point successive grounding fault of a distribution network line. The line selection method specifically comprises the steps of (1) real-time data acquisition, (2) grounding fault start judgment, (3) grounding line selection, (4) short circuit fault start judgment, (5) two-point grounding line selection and (6) fault return judgment. According to the invention, a line selection task is started when zero-sequence voltage is detected to exceed a set value, a single grounding fault line is selected, then short circuit fault start judgment is performed in a cyclic manner in a fault period, a different-phase two-point grounding fault is judged to occur if zero-sequence current is detected to exceed a short circuit set value, two lines with the maximum fundamental wave amplitude are found, and the two lines are judged to be grounding lines if the two lines are equal in amplitude and opposite in phase. The line selection method effectively solves a problem of line selection for the different-phase two-point successive grounding fault of the distribution network line, thereby being conducive to improving the work efficiency, reducing the power failure range, guaranteeing safe running of the system and reducing personal casualties.

A method for measuring the electric conduction loop resistance of a circuit breaker is provided. The method comprises the following steps that: with grounding wires at two sides of the circuit breaker being not dismantled, I+ and U- of an HR loop resistance tester are directly connected with one side of a measured resistor RX; I- and U- of the HR loop are resistance tester are connected with the other side of the measured resistor RX; and then, testing is performed. According to the method for measuring the electric conduction loop resistance of the circuit breaker, self resistance of the grounding wires at the two sides of the circuit breaker, equipment grounding downlead resistance values, resistance values generated by frequent contact are far more larger than the resistance value of a switching-on loop inside the circuit breaker; equipment wire clamps at the two sides of the circuit breaker, which are connected with high-voltage leads, do not need to be dismantled; high-altitude?ascending and operation are not required; it does not need to dispatch and report to a work ticket signer and a work ticket licensor as well as apply to the work ticket signer and the work ticket licensor for dismantling the grounding wires at the two sides; testing can be accurately and fast performed on the electric conduction loop resistance of the circuit breaker (switch); and the method can assist in greatly shortening testing time, and greatly reducing outage time and significantly improving work efficiency and economic benefits.

The invention discloses a method for verifying a polarity of a zero-sequence current transformer. A hardware part comprises a signal acquisition system; a software part comprises a waveform analysis system; and the method comprises the following steps of: capturing an instant single-phase earth fault signal which mainly includes a bus zero-sequence voltage and a zero-sequence current of each line through the signal acquisition system by utilizing the characteristic of frequent instant single-phase earth fault of a distribution network system; and identifying whether a polarity connecting wire of the zero-sequence current transformer of each line is correct through the waveform analysis system based on the maximum zero-sequence amplitude value of a fault line and the characteristic that the phase position is opposite to that of the zero-sequence current of a non-fault line. The method for verifying the polarity of the zero-sequence current transformer solves the polarity verification difficulty of the zero-sequence current transformer in a small-current grounding line selection system efficiently without adding any device or tool, is very time-saving, convenient and fast, and solves a big difficulty in the practical application of small-current products.

The invention provides a multi-rotor-wing patrolling aircraft and a power transmission line patrolling system. The multi-rotor-wing patrolling aircraft comprises a multi-rotor-wing flight device, a line falling walking device, a patrolling device, a control device and a flight end wireless transmission interface, wherein the multi-rotor-wing flight device comprises a cabin, a plurality of rotor wings and an undercarriage; the line falling walking device comprises a support frame, a guide camera and a moving mechanism; the patrolling device comprises a patrolling camera; the flight end wireless transmission interface is wirelessly connected with a ground command device; the control device receives a command sent by the ground command device, controls the rotor wings to fly and controls the moving mechanism to move along a to-be-mounted conductive ground line. The power transmission line patrolling system comprises the multi-rotor-wing patrolling aircraft and the ground command device, wherein the ground command device particularly comprises an action command device, an image analyzing device, a display and a ground end wireless transmission interface. The power transmission line patrolling system has an accurate power line mounting function; the patrolling view field is widened; the patrolling efficiency is improved; the labor cost for patrolling is lowered.

The invention discloses a method for automatically designing and optimizing a railway vertical profile. The method comprises the steps of carrying out ground line smoothening processing to an original ground line, fitting an initial slope to the smoothened ground line, carrying out vertical profile design constraint condition processing to the initial slope, forming a vertical profile automatic slope design scheme, optimizing the vertical profile based on a differential evolution algorithm, setting optimization control parameters, initializing the populations according to the vertical profile automatic slope design scheme, using a target function to assess the advantages and disadvantages of the individual vertical profile scheme, calculating an individual target function value, carrying out evolution among the populations by using a mutation operation, an interlace operation, a restoring operation, setting of railway tunnel and a selecting operation until the final evolution condition is reached, and outputting a vertical profile diagram and a standard check table. The method for automatically designing and optimizing railway vertical profile has the advantages of high automation degree, strong practicality, fast computing speed, and high promotion and application value in design and optimization of the railway vertical profile.

An organic light emitting diode display includes a substrate including a display area and a non-display area, a display unit that is formed in the display area and includes a plurality of subpixels arranged in a matrix form, a main ground line that is positioned at a first side of the non-display area and is formed using the same material as source and drain electrodes included in each subpixel, and an auxiliary ground line that is formed to surround the non-display area, overlaps at least a portion of the main ground line at the first side of the non-display area, is electrically connected to the main ground line, and is formed using the same material as a lower electrode included in each subpixel.

The invention relates to a complete set of compound grounding devices of the controllable reactor and the small resistor for the power grid. The invention is characterized in that the invention comprises a grounding transformer (1), a controllable reactor (2), a small resistor (3) and a controller (4); the secondary winding of the grounding transformer (1) is connected with the neutral point (PT) of the power grid and connected with the grounding point (CT) through the controllable reactor (2), and the small resistor (3) is connected in series with a high voltage switch (5), and the small resistor (3) and the high voltage switch (5) are connected in parallel with the controlled reactor (2); the two inputs of the controller (4) are connected with PT and CT respectively, and the control signal output of the controller (4) is connected with the control input of the high voltage switch (5). The invention solves the problems that various prior protection devices for the grounding fault of the power grid are very difficult to be grounded in isolation, and the grounding lines are very difficult to be found. The invention implements the fast removal of the fault without tripping, and is an ideal set of grounding fault protection device for the distribution network.

To provide an electric power steering apparatus in which ground processing for respective sections requiring a ground can be reduced to necessary minimum to improve assemblability. An electric power steering apparatus includes a steering column 3 having inserted therein a steering shaft 2 to which steering torque is transmitted and an electric motor 5 that transmits a steering assisting force to the steering shaft 2 via a reduction mechanism in a conductive reduction gear box 4. A control unit 19 including boards 23 and 25 mounted with control circuits that control to drive the electric motor is mounted on the reduction gear box 4, a connecting section of the electric motor 5 is electrically connected to the control unit 19 directly, and connection of the reduction gear box 4 and the control unit 19 to a ground is performed via a grounding line 29 disposed between the control unit 19 and a power feeding unit 30.

The invention discloses a ground line selection method for a small current grounding system. The method solves the problem that the prior line selection method is low in sensitivity and generates errors in line selection. The method comprises the following steps: 1, single-circuit lines and double-circuit lines are numbered and placed in a microcomputer; 2, the microcomputer judges whether the system is grounded or not and identifies a grounding phrase of the system; 3, according to the number of the single-circuit lines and the double-circuit lines, the microcomputer calculates a grounding transfer characteristic formula with zero sequence current which is measured during the normal operation of the system, zero sequence current of the single-circuit lines, zero sequence voltage of a bus and zero sequence current of the double-circuit lines which are measured when the system is grounded, and zero sequence voltage of a bus, zero sequence current of the double-circuit lines and zero sequence current of the single-circuit lines which are measured during grounding transfer of the system; the result of the calculation is compared with grounding current IJ passing through a split phase switch of the grounding phase during grounding transfer to determine a fault line. The method has the advantages of the characteristics of high sensitivity and accurate line selection and great significance on accurate identification of grounding circuit, grasp of grounding and arc-suppression coil conditions of the system, and promotion and improvement of safe and reliable operation of the system.

The invention provides an online monitoring method of grounding current of an iron core of a transformer, and the method comprises the following steps: (1) sheathing a straight-through current transformer on a grounding wire of the iron core of the transformer for getting a primary iron core grounding current signal; (2) utilizing the straight-through current transformer to convert the acquired primary current signal into a secondary current signal and converting the secondary current signal into a voltage signal; (3) performing gear position switching and amplification treatment on the voltage signal, and further sending the signal to an AD (analog/digital) circuit arranged in a controller via a voltage signal conditioning circuit; and comparing with a pre-set alarm threshold, and using the controller to control a display screen to display an alarm signal when the signal is abnormal; and (4) on the one hand, displaying the signal after calculation treatment in the step (3) through the display screen, on the other hand, storing measurement result and measurement time in a FLASH memory. The method is widely suitable for online monitoring of the grounding current of the iron cores/clamping pieces of the transformers, reactors and other electrical equipment.