191 results about "Neutral line" patented technology

One aspect of the invention relates to a bidirectional on-board charger 2 for a vehicle 1, comprising:a bidirectional AC-to-DC converter 8 designed to supply power to an electrical power supply socket 6 for an external electrical device;means for detecting an electrical insulation fault 9, connected to a phase line 12 and to a neutral line 13 of said electrical power supply socket 6; a switch 16 arranged on said phase line 12; a switching means 18 designed to control the switch 16 between a first position P1 in which the means 9 are connected to the socket 6 and a second position P2; a resistor 20 which, when the switch 16 is in the second position P2, is electrically connected to the switch 16 and to a ground 10 of the vehicle.

A grid-connected distribution box is provided, comprising: a housing having an internal space; a first terminal block module disposed in the internal space and having a control board and a secondary input terminal, the control board being configured to control power distribution and the secondary input terminal being connected to at least one secondary power source; and a second terminal block module disposed to partially overlap the first terminal block module and having a neutral terminal connected to a neutral line.

The utility model relates to a three-phase four-wire electric energy metering combined junction box, which comprises a base, a detachable anti-theft cover arranged on the base, a bottom plate sealed at the bottom of the base, and a neutral line connecting group, at least three current connecting groups and at least four fuse connecting groups arranged at the bottom of the base and arranged between the base and the bottom plate, the neutral line connecting group is located at the top end of one side of the bottom of the base, and the fuse connecting groups and the current connecting groups are alternately arranged at adjacent positions of one side of the neutral line connecting group and extend to the top end of the other side of the base. According to the utility model, the key components such as the neutral line connecting group, the current connecting group and the fuse connecting group are integrated between the base and the bottom plate, so that the compactness of the structure is realized, the design of the detachable anti-theft cover effectively prevents unauthorized access and tampering, and the safety of equipment is enhanced; the anti-theft cover made of a transparent material enables a user to visually observe the internal state of the junction box, thereby facilitating daily maintenance and troubleshooting.

The invention provides a circuit and an EMI filter. Exemplary embodiments of a circuit for integrating and / or combining an electromagnetic interference (EMI) filter with a power line without using a capacitor are disclosed. In an exemplary embodiment, a circuit includes a common mode inductor including a first inductor and a second inductor. The first inductor is configured to be operable to provide a first impedance along a live line of the circuit. The second inductor is configured to be operable to provide a second impedance along a neutral line of the circuit. The circuit also includes a third inductor configured to be operable to provide a third impedance along a ground of the circuit.

A method, electronic device, and readable storage medium for rapid optimization of neutral bus arrester parameters are disclosed. Based on the main circuit topology of a symmetrical bipolar flexible DC system composed of a half-bridge submodule MMC converter, the method establishes equivalent circuits for different fault conditions, including DC pole-to-ground faults, single-phase-to-ground faults in the valve-side windings connected to the transformer delta connection, and neutral line open-circuit faults. It obtains the energy absorbed by the neutral bus arrester and, based on the relationship between the energy absorbed by the neutral bus arrester and its protection level, optimizes the energy absorption of the arrester under different fault conditions with the goal of balancing the energy absorbed. This allows for rapid optimization of the neutral bus arrester parameters, offering advantages of speed, economy, and efficiency.

This invention provides a fault early warning method for low-voltage power distribution systems in smart factories, belonging to the field of low-voltage power distribution fault early warning technology. Based on the low-voltage power distribution system topology, it deploys synchronous current and voltage acquisition terminals and ambient temperature sensors to acquire real-time current waveforms, voltage sag events, neutral current values, and ambient temperature for each circuit. The real-time current waveforms are decomposed into harmonic sequences using Fourier transform, generating a harmonic spectrum distribution matrix. A joint probability table of voltage sag and neutral overcurrent events is constructed by correlating timestamps. Combining the harmonic amplitude growth trend with the characteristics of coupled events whose joint occurrence probability exceeds a set threshold, a candidate circuit set for insulation degradation risk is screened, and temperature field inversion calculation is performed to generate a conductor surface temperature rise distribution map. This method can quantify the temporal coupling relationship between the two types of events, narrowing the fault investigation scope, reducing false alarms and missed detections, accurately reflecting the insulation degradation state of the circuits, and achieving accurate fault early warning for low-voltage power distribution systems.

The present application provides a neutral wire joining method that can suppress damage or deformation of a neutral busbar even when the neutral busbar is gripped by multiple gripping devices. The present application provides a neutral wire joining method that joins a first U-phase neutral wire, a first V-phase neutral wire, and a first W-phase neutral wire to a neutral busbar by welding in a state where the first U-phase neutral wire and the neutral busbar are gripped by a first gripping device, the first V-phase neutral wire and the neutral busbar are gripped by a second gripping device, and the first W-phase neutral wire and the neutral busbar are gripped by a third gripping device, the neutral wire joining method including a step of providing a predetermined gap between a reference jig branch portion and a support jig and a neutral busbar to position the neutral busbar.

The application discloses a kind of station with alternating current system residual current monitoring method and system, the method includes: cloud server receives the current signal sent by monitoring field mobile terminal, the current signal includes the current signal of three phase lines and one neutral line;Based on the deviation change trend of historical measurement results of residual current sensing device, correct current signal;Based on the current signal of four lines after correction, vector synthesis is carried out, and residual current signal is obtained;Based on current residual current signal, extract feature vector, based on feature vector analysis whether fault occurs and the fault type that occurs.The application uses mobile terminal and cloud to jointly realize residual current monitoring, improve the accuracy and efficiency of residual current monitoring analysis, uses the fault analysis of residual current signal by cloud, realizes the monitoring of line electrical safety.

A stator for a rotating electrical machine includes: a stator coil in which four or more sets of coil portions for each phase are connected as a parallel circuit between a neutral line terminal and a power line terminal for each phase; and a stator core that has a plurality of slots and around which the stator coil is wound. Stator coil includes slot insertion portions each inserted in corresponding slot, and a crossover portion exposed from an axial end face of stator core and extending in a circumferential direction so as to connect a pair of slot insertion portions. In each phase, a plurality of slot insertion portions in each set includes a first slot insertion portion directly connected to the power line terminal. First slot insertion portion for each phase is located on radially outermost side in corresponding slot on one side in axial direction of stator core.

The application discloses a method for anti-electricity stealing based on abnormal connection of user single-phase electric meter, and relates to the technical field of electric power metering, which comprises the following steps: installing sampling units on the incoming line side and the outgoing line side of the user single-phase electric meter, synchronously collecting single-phase voltage, current, neutral line current and temperature and humidity signals of the meter box, and generating synchronous electrical data sequences through standardization and time stamp alignment. Single-phase voltage and current fundamental phase angles are calculated based on voltage and current instantaneous value sequences, and a phase angle difference map is constructed. The effective value of the neutral line current is calculated, and an abnormal flag sequence is generated in combination with a normal load reference range. The environmental temperature and humidity abnormal fluctuation period is extracted. The above-processed features are input into a connection mode recognition model to identify suspected electricity stealing connection mode categories, improve the accuracy of meter connection abnormality recognition, and reduce misjudgment. The method can effectively identify meter connection abnormalities and improve the accuracy of electricity stealing identification.

The invention discloses a low-voltage power supply cable fault detection method and system. The method comprises the steps of obtaining cable fault data; preprocessing the cable fault data; the pre-processed data are input to a cable fault detection model for classification diagnosis of low-voltage cable faults so as to obtain a detection result, and the cable fault detection model is used for injecting characteristic frequency signals into a low-voltage power supply cable neutral line and collecting multi-source cable fault data through a coupling mutual inductor; performing deep feature extraction and weighted fusion on the preprocessed signal by using a multi-channel one-dimensional convolutional neural network in combination with an attention mechanism, and realizing fault type identification through a full-connection network; and outputting a detection result. According to the method, cable fault diagnosis is carried out by adopting the deep learning model, so that the accuracy of fault identification is improved, and excellent performance is shown in the aspects of processing complexity and nonlinear problems.

Wave gear (1) with a ring-shaped, fixed, internally toothed gear (2), a flexible, externally toothed gear (3) arranged inside the internally toothed gear (2), and a wave generator (4) which is inserted into the externally toothed gear (3), wherein the flexible, externally toothed gear (3) has a flexible, cylindrical body region (301) and an annular membrane (302) extending radially from a rear end (301a) of the cylindrical body region (301), and wherein a toothed region formed in a region of the cylindrical body region (301) near an open region at the front end (301b) is deformed into an elliptical shape by the wave generator (4) over a region extending from a rear end region near the diaphragm (302) to a front end region near the opening, such that the deformation is substantially proportional to the distance from the diaphragm (302), wherein the wave gear (1) has a compound tooth profile which is engaged during positive deformation, wherein: the fixed, internally toothed gear (2) is designed as a spur gear with a module (m); the flexible, externally toothed gear (3) is designed as a spur gear with a module (m); a number of teeth of the flexible, externally toothed gear (3) is smaller by the size 2n, where n is a positive integer, than the number of teeth of the fixed, internally toothed gear (2); the deformation of a principal axis of an elliptical boundary neutral line of the flexible, externally toothed gear (3) in a cross-section which is perpendicular to an axis and is hereinafter referred to as the principal cross-sectional area, and which is selected at a predetermined position of the toothing of the flexible, externally toothed gear (3) in a tooth path direction, is set to 2κmn (κ>1); the engagement of the teeth of the fixed, internally toothed gear (2) and the flexible, externally toothed gear (3) in the main cross-sectional area is approximated by rack engagement in order to calculate a motion position curve (M) of the teeth of the flexible, externally toothed gear (3) in relation to the teeth of the fixed, internally toothed gear (2) in connection with a rotation of the shaft generator (4); characterized by the fact that a curve region (AB) is obtained from a region of the motion position curve (M) extending from the main axis of the deepest engagement position of the two gears (2, 3) to a side where the engagement of the teeth is disengaged, such that the curve region (AB) begins at position (A) of the deepest engagement of the two gears (2, 3), which is the position where the inclination angle is 90°, and reaches a position (B) where the inclination angle of the motion position curve (M) relative to a radial line of the fixed, internally toothed gear (2) is α° (0°<α°<30°); and a main area of ​​the tooth profile (30) of the flexible, externally toothed gear (3) is defined by a first similarity transformation curve (AC) in which the curve area (AB) is enlarged by a multiple of λ, and by a straight line (33) smoothly connected to an endpoint of the first similarity transformation curve (AC); a main region of a tooth profile (20) of the fixed, internally toothed gear (2) by a second similarity transformation curve (AD) in which the curve region (AB) is enlarged by a multiple of (λ+1), and is defined by a straight line (24) smoothly connected to an endpoint of the second similarity transformation curve (AD); and a value of λ is less than a maximum value of λ, where the maximum value of λ is obtained when the curve region (AB) is subjected to a similarity transformation with the factor (λ+1), where the origin of the similarity transformation of the curve region (AB) is placed at the position of the deepest intervention (A), such that a remote end of the second similarity transformation curve (AD) is arranged on the motion position curve (M).

The application discloses a wiring protection method and device and a power supply system, and belongs to the technical field of power supply. The method is used for a power supply system, the power supply system comprises at least two power supply devices connected in parallel, the power supply devices are connected with a power grid and a load through two power supply lines respectively, the two power supply lines are a first power supply line and a second power supply line, the second power supply line comprises a neutral line switch and at least two phase line switches, and the method comprises the following steps: acquiring power supply states of the first power supply line and the second power supply line; in the case that the first power supply line is in a power supply state and the second power supply line is in a non-power supply state, outputting a first control instruction, the first control instruction is used for instructing the at least two power supply devices to control the switches on the corresponding second power supply line to be closed in turn according to a preset closing time sequence. The method can reduce the risk of phase-to-phase short circuit caused by wiring errors.

The invention discloses an offshore wind power double-channel output flexible direct current power transmission system and a control method thereof, and relates to the technical field of direct current power transmission. The system comprises a positive offshore commutation channel, a negative offshore commutation channel, a positive onshore commutation channel and a negative offshore commutation channel, the positive electrode of the positive offshore commutation channel is electrically connected to the positive electrode of the positive onshore commutation channel through a positive wire cable; the negative electrode of the positive offshore commutation channel and the positive electrode of the negative offshore commutation channel are electrically connected to a grounding end through a neutral line cable, and the negative electrode of the positive land commutation channel and the positive electrode of the negative land commutation channel are electrically connected to the grounding end; the cathode of the cathode offshore commutation channel is electrically connected to the cathode of the cathode onshore commutation channel through a cathode wire cable; and the alternating current side of the positive overland commutation channel and the alternating current side of the negative overland commutation channel are electrically connected to corresponding alternating current power grids through corresponding overland alternating current buses respectively. According to the embodiment of the invention, the power transmission reliability of the power transmission system can be effectively improved.

A fixing structure for fixing a neutral wire and a temperature sensor fixes the neutral wire forming a neutral point of a stator coil and the temperature sensor. The fixing structure has a plurality of protruding portions that protrude from the neutral wire in a direction away from a current path in the neutral wire during energization and are opposed to each other. The temperature sensor is sandwiched between a plurality of protruding portions facing each other.

The invention relates to an asymmetric bidirectional rectifier structure with leg reconfiguration for multi-phase operation. There is provided an apparatus (100) comprising a rectifier stage (110) having a neutral line (N) and configured to convert between an AC signal and a DC signal. The rectifier stage (110) includes at least one rectifier branch (112A) having a neutral point connection topology and at least one rectifier branch (112C) having a flying capacitor topology. The reconfiguration switch (130) is configured to switch between a single-phase operation and a three-phase operation of the rectifier stage (110).

Electric vehicle charging cable (1) for connecting a charging station and an electric vehicle according to the Type 2 standard as defined in IEC 62196-2, comprising: - at least three power lines (2a, 2b, 2c) for three-phase power transmission, - a neutral conductor (3), - a protective conductor (4), - a control pilot signal line (5) as defined in IEC 61851-1, - a proximity pilot signal line (6), - a Type 2 connector (7a, 7b) at each end, characterized in that: - an electronic unit (10) is integrated into the cable or into at least one of the connectors (7a, 7b), - the electronic unit (10) comprises a microcontroller (11) with an analog-to-digital converter, - the microcontroller (11) is connected to the control pilot signal line (5) via a voltage divider (12) and continuously monitors the voltage of this line, - the electronic unit (10) includes at least one acoustic signal generator (13) includes,- the microcontroller (11) is programmed,to distinguish the voltage states of the control pilot line (5) according to IEC 61851-1 (State A: +12 V; State B: +9 V; State C: +6 V; State E: 0 V),- the electronic unit (10) emits a first acoustic signal when transitioning from State A to State B,- the electronic unit (10) emits a second acoustic signal, distinguishable from the first acoustic signal, when transitioning from State B to State C,- the electronic unit (10) emits a third, warning acoustic signal if State B persists for a predefined period of 5 to 15 seconds without transitioning to State C.

The invention provides a low-voltage power distribution network grounding leakage fault positioning and identification system and method, and the system comprises a first measurement unit which is disposed at a low-voltage power distribution main line and is used for synchronously collecting the synthesized residual current of a three-phase phase line and a neutral line; the second measuring unit is arranged on a neutral point grounding wire of the distribution transformer and is used for collecting grounding leakage current; the reference measurement unit is used for synchronously acquiring three-phase voltage information; and a data synchronization and communication module and a central analysis terminal. The central analysis terminal compares the residual current with the grounding current under the synchronization condition, judges that the leakage fault is located at the upstream or downstream of the measurement point, and identifies the fault phase based on the phase or correlation between the grounding current and the three-phase voltage; according to the invention, rapid positioning, phase identification and operation state discrimination of grounding leakage faults can be realized.

The present invention relates to a junction box having a leakage current limiting function, in which a leakage current is limited by using an area difference between conductor electrodes respectively connecting end portions of single-phase three-wire input-side phase voltage lines (R lines), neutral lines (N lines), and ground lines (G lines) and output-side phase voltage lines (R lines), neutral lines (N lines), and ground lines (G lines), so that an electric shock accident can be more effectively prevented.

The utility model relates to an electric driving system and a vehicle. The electric driving system comprises a charging port; the three-phase winding comprises a first-phase winding, a second-phase winding and a third-phase winding; the driving module is provided with a first driving end, a second driving end and a third driving end; wherein a first phase line is connected between the first driving end and the first phase winding, a second phase line is connected between the second driving end and the second phase winding, a third phase line is connected between the third driving end and the third phase winding, and a neutral line is connected between a neutral point of the three-phase winding and the charging port; and the magnetic ring assembly sleeves the first phase line, the second phase line, the third phase line and the neutral line. Therefore, by arranging the magnetic ring assemblies on the first phase line, the second phase line, the third phase line and the neutral line in a sleeving mode, EMC can be effectively restrained, the electric corrosion phenomenon of the bearing is prevented, and meanwhile the working temperature rise of the magnetic ring assemblies is remarkably reduced.

A power converter device and a method of controlling the same are disclosed. The method comprises: in a single-phase mode, connecting a first switching branch and a second switching branch to a first phase line of a single-phase source; connecting the third switch branch and the fourth switch branch to a neutral line of the single-phase source; and control switching of the first switching branch, the second switching branch, the third switching branch and the fourth switching branch to generate an output signal at the high side terminal and the low side terminal; and in a three-phase mode, connecting the first switching branch to a first phase line of the three-phase source; connecting the second switching branch to a second phase line of the three-phase source; connecting the third switching branch to a third phase line of the three-phase source; and controlling switching of the first switching branch, the second switching branch and the third switching branch to generate an output signal.

The invention relates to the technical field of data center bus duct temperature monitoring, in particular to a data center bus duct operation environment intelligent monitoring method. The method comprises the following steps: firstly, monitoring temperature through distributed temperature measurement optical fibers laid on the surface of a large bus, and positioning a high-temperature section; calling data of the four-channel infrared temperature sensor at the connector joint of the high-temperature section, and identifying abnormal high temperature of the neutral line; main and branch harmonic data are called, whether harmonic exceeds the standard or not is evaluated through weighted calculation, and whether the high temperature of the neutral line is caused by the harmonic or not is judged. If it is judged that the heat source is caused by harmonic waves, a phase comparison method is adopted to lock a main harmonic source branch and the contribution ratio of the main harmonic source branch, harmonic spectrum characteristics of the branch are analyzed to identify an abnormal type, an automatic treatment strategy is generated, and then generation of the heat source is blocked from the source. According to the invention, deep perception, root cause diagnosis and active intervention of the running state of the bus duct are realized, and the reliability and the operation and maintenance intelligence level of a data center power supply system are improved.

The utility model discloses a multipath switchable alternating current atmosphere lamp, which relates to the technical field of lighting equipment and comprises an upper cover, a lower shell is fixedly arranged on the lower side of the upper cover, a bottom cover is fixedly arranged on the lower side of the lower shell, and a PCB (printed circuit board) lamp panel is fixedly arranged in the lower shell and positioned below the upper cover. The lower side of the lower shell is provided with more than two wire grooves, each wire groove is fixedly provided with a hardware terminal, and the hardware terminals are electrically connected with the PCB lamp panel. The design that the null line is shared in the middle and the live lines are independent on the two sides is adopted, the one-lamp multi-path control mode is supported, a user can switch different lighting programs (such as color temperature and brightness) according to needs, scene adaptability is improved, the number of cables is reduced by sharing the null line, installation complexity is lowered, and the internal space utilization rate is optimized.

Provided is an apparatus comprising a rectifier stage having a neutral line and configured to convert between an AC signal and a DC signal. The rectifier stage comprises at least one rectifier leg with neutral-point connected topology and at least one rectifier leg with flying capacitor topology. A reconfiguration switch is configured to switch between single-phase and three-phase operation of the rectifier stage.

The utility model relates to the technical field of fracturing command shelters, and discloses an integrated fracturing command shelter intelligent power distribution system, which comprises a three-phase power taking circuit and a single-phase power taking circuit. The three-phase electricity taking circuit comprises three live wires for taking three-phase electricity and a null line connected with a neutral line, the three live wires and the null line form three independent electricity utilization loops respectively, the three live wires are connected with a first contactor used for controlling the three live wires to be conducted, the single-phase electricity taking circuit comprises a single-phase live wire, and the single-phase live wire is connected with a second contactor used for controlling the three live wires to be conducted. The single-phase live wire is divided into three single-phase live wires which are connected in parallel, the three single-phase live wires are firstly connected with a second contactor and then are respectively connected to the wire inlet sides of the three power utilization loops, one of the three power utilization loops is connected with an uninterruptible power supply in parallel, and the other one of the three power utilization loops is connected with a three-phase power taking circuit in parallel. And various power supply requirements of the fracturing command square cabin are ensured.

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.

The application provides a neutral line overlapping switching mechanism which comprises a common rotating shaft, a standby rotating shaft, an interlocking mechanism, a first spring and a second spring, the common rotating shaft is connected with the standby rotating shaft through the interlocking mechanism, the common rotating shaft is connected with a common N-phase contact through a first tension spring, and the standby rotating shaft is connected with a standby N-phase contact through a second tension spring, characterized in that the interlocking mechanism comprises a first limiting piece, a second limiting piece and a fixing base, the first limiting piece and the second limiting piece are symmetrically installed on the fixing base, and the first limiting piece is connected with the second limiting piece through a spring; the first limiting piece is connected with the common rotating shaft through a first connecting rod, a first adjusting mechanism is installed on the first limiting piece and used for adjusting the rotation angle of the first limiting piece, and a second adjusting mechanism is installed on the second limiting piece and used for adjusting the rotation angle of the second limiting piece.

The invention relates to a method for operating a charger (1) for a motor vehicle, in particular an on-board charger for a motor vehicle, the charger (1) having a multi-phase input connection (3) for connection to a multi-phase supply network connection (4) of an in particular stationary supply network, and a voltage converter (5), the voltage converter (5) has at least one intermediate circuit (13) with at least one intermediate circuit capacitor (14, 15). According to the invention, after the input connection (3) is connected to the supply network connection (4), a first intermediate circuit voltage of the intermediate circuit (13) is detected by means of a voltage sensor (V13) of the intermediate circuit (13) before the intermediate circuit (13) is connected to a neutral phase (N) of the input connection (3) by means of an actuatable switching element (S4), and detecting a second intermediate circuit voltage of the intermediate circuit (13) after the intermediate circuit is connected to the zero line of the input connection; furthermore, on the basis of a comparison of the second intermediate circuit voltage with the first intermediate circuit voltage, it is determined whether the supply network connection (4) has a neutral line connected to the neutral line phase (N).

The invention relates to a connector (1) configured for connection to a terminal (2) connected to a power source (3) of a vehicle (4), wherein the connector (1) has a primary control line (PP), a secondary control line (CP), at least two, in particular exactly three, phase lines (L1, L2, L3), a neutral conductor (N), and in particular a protective conductor (PE). The connector (1) is configured to signal on the primary control line (PP) and / or the secondary control line (CP) that a connector configured for drawing power from the terminal (2) is connected, and to signal on the secondary control line (CP) that either a single-phase or a multi-phase voltage output is requested. The invention also relates to a connector device (50) with such a connector (1) as a first connector and a second connector (21, 21').