32results about How to "No saturation" patented technology

A terahertz wave detector comprises a chopper (1) and a polyethylene lens (2) and is characterized by further comprising a neon lamp (3), wherein the neon lamp (3), a direct-current power supply (4) and an ampere meter (5) form a closed loop circuit. The output end of the neon lamp (3), a capacitor (6), an amplifier (7) and an oscilloscope (8) or a phase-locked amplifier (11) form a closed loop circuit. The chopper (1) is arranged in front of the polyethylene lens (2), the neon lamp (3) is arranged at the focus position of the polyethylene lens (2), and a modulating signal of the chopper (1) is input into the oscilloscope (8) to serve as a reference signal. The terahertz wave detector uses the cheap neon lamp as a detecting element, thereby reducing the production cost and improving the response speed. In addition, a response wave band is wide. When the power of terahertz waves is high, the detector is not damaged, and an equilibration phenomenon does not occur.

A multifunctional integrated high-pressure metering device is used for improving metering precision, and the volume and cost of the device are reduced. The technical scheme is that the multifunctional integrated high-pressure metering device comprises a three-phase voltage mutual inductor, a three-phase current mutual inductor, a metering control circuit and a high-voltage switch controlled by anelectric operation mechanism; the three-phase voltage mutual inductor and the three-phase current mutual inductor respectively collect the voltage and current signals of a high-voltage power supply circuit; the metering signals outputted by the three-phase voltage mutual inductor and the three-phase current mutual inductor are connected to the signal input end of the metering control circuit; thehigh-voltage switch is serially connected in the high-voltage power supply circuit; the control end of the electric operation mechanism is connected to the control signal output end of the metering control circuit. The device of the invention is integrally designed; while the metering precision is improved, the repeated setting of functional elements is avoided, so that the volume of the meteringdevice is decreased, and the manufacture cost is reduced.

The invention relates to an on-site verification apparatus for an optical fiber current sensor, a usage method of the on-site verification apparatus and application of the on-site verification apparatus. The on-site verification apparatus for the optical fiber current sensor includes an optical fiber current detection sensing module and an optical fiber current detection processing and display module. The optical fiber current detection sensing module is composed of a light source, a linear polariscope, a polarization separator, a modulator, a transmission optical fiber, a 1 / 4 wavelength filter, an optical fiber sensing head, a reflector and a photoelectric detector. Proceeding from installation and debugging of the optical fiber current detection sensing module, the optical fiber current sensor on-site verification apparatus has reasonable control steps, is easy to operate, and can carry out efficient, economic and accurate error detection and quantity transmission on a DC heavy current sensor working on site for a long time; the optical fiber current sensor on-site verification apparatus is suitable for detecting and verifying a current detection sensor working on site for a long time in fields of electrolytic aluminum, electrolytic copper, electric smelting, electroplate and other electrochemical engineering; the on-site verification apparatus for the optical fiber current sensor is good in safety performance, large in measuring dynamic scope, high in frequency response degree, small in size and light in weight; and by adopting the on-site verification apparatus for the optical fiber current sensor, the measuring precision of a current detection apparatus can be raised, and needs of safety and stabilization of a power supply system are met.

The invention relates to a detection circuit for the partial discharge of a capacitor, which is used for detecting the partial discharge signals of a high-voltage capacitor. The detection circuit comprises a self-balancing coupling transformer, an inducer and a capacitor, wherein the self-balancing coupling transformer comprises an iron core and three coils, and the first coil has the same structure as that of the second coil. The head end of the first coil is an unbalanced input end connected with a test power supply through a sampling capacitor, and the tail end of the first coil is connected with the tail end of the second coil through the inducer and connected with the head end of the second coil through the capacitor. The head end of the second coil is connected with a signal public end, and partial discharge signals outputted from the two ends of the third coil are connected with a partial discharge tester. The invention can work at two test modes: unbalanced mode and balanced mode, and can separate out partial discharge pulse current signals when an impedance magnetic core is approximate to zero magnetic flux at either test mode. The self-balancing coupling transformer can not be saturated, therefore the sensitivity of partial discharge detection can not be influenced by the current size in a main loop.

The invention relates to the field of permanent magnet motors, and discloses a built-in permanent magnet motor. The built-in permanent magnet motor comprises a case, a regular polygonal stator iron core, an asymmetric hybrid rotor iron core, permanent magnets, a shaft, windings and insulating frames. The regular polygonal stator iron core is defined by a plurality of T-shaped tooth connection yokes. The contact part of the regular polygonal stator iron core and the case forms a contact area, and a gap between the regular polygonal stator iron core and the case forms a filling area. The asymmetric hybrid rotor iron core comprises a shaft sleeve, a shaft hole, a fan area, connecting bridges and supporting protrusions and contains full-connecting-bridge-type laminations and a half-connecting-bridge-type lamination. The full-connecting-bridge-type laminations are located at the two ends of the asymmetric hybrid rotor iron core, and the half-connecting-bridge-type lamination is clamped by the full-connecting-bridge-type laminations in a wrapped mode in the axial direction. Tooth parts of all the T-shaped tooth connection yokes are wrapped with the insulating frames. The windings are wound around the insulating frames. According to the built-in permanent magnet motor, the production technology of the motor can be simplified, and the structural strength of the motor can also be improved.

The invention discloses a plug-and-play series power quality compensator and a compensation control method and belongs to the field of power compensators. The plug-and-play series power quality compensator is characterized in that a voltage detection module is used to detect real-time voltage of a load; a voltage is applied to a secondary side of a special transformer via an inverter to generate feedback voltage; the special transformer includes a primary side winding and a secondary side winding, the primary side winding is used as a busbar connected to a power grid, the secondary side winding is tightly stacked in the axial direction and connected with the output end of an inversion control module; the input end of the inversion control module is connected with direct-current side voltage, the control end of the inversion control module is connected to the output end of the voltage detection module, and the inversion control module is used for outputting feedback control voltage forthe secondary side of the special transformer according to a reference voltage signal. The plug-and-play series power quality compensator is simple to connect, has no influence on the structure of a power grid, has flexible control modes and meets the needs of different scenes.

The invention discloses a digital zero sequence current transformer for a column switch, relates to the electronic transformer technology and eliminates magnetic saturation and ferroresonance problemsas the electronic transformer contains no core. The digital zero sequence current transformer includes a sensor module and a signal processing module, wherein the sensor module is used for outputtinga three-phase current in the column switch to the signal processing module, the sensor module is composed of an integrated PCB Rogowski coil, the integrated PCB Rogowski coil is formed by uniformly arranging a printed lead on a printed circuit board (PCB), and the signal processing module is used for converting the signal inputted by the sensor module into a digital signal and outputting the digital signal.

The invention relates to a method for suppressing voltage saturation out-of-control control of a permanent magnet synchronous motor controller of a new energy automobile. The method comprises the steps of setting a voltage utilization rate threshold k; querying Idq_Map according to a Vcu torque instruction to obtain corresponding d-axis reference current Id_Map and q-axis reference current Iq_Map;calculating an adjustment current [delta]Is according to the current voltage vector amplitude and a control strategy; and calculating to obtain output reference currents Id_ref and Iq_ref according to the current motor output power and the adjustment current [delta]Is. According to the invention, the method for suppressing voltage saturation out-of-control control of permanent magnet synchronousmotor controller of the new energy automobile is adopted, an anti-saturation control strategy of the permanent magnet synchronous motor is provided, the strategy is based on calibration of flux weakening control, under the premise that the output torque precision is ensured to the maximum extent, it is guaranteed that when the motor is started to a high speed in a cold state, the output voltage ofan inverter is not saturated, and the control safety and reliability of the motor are improved.

The invention relates to an automatic electricity getting flexible mutual inductor, the inductor comprises an inductor body which comprises an upper body and a lower body, the upper body and the inner wall of the lower body form a wire hole, the upper body is rotatably connected with one end of the lower body, a rotating shaft is interspersed, an opening and closing mouth is arranged between one end of the upper body relative to the lower body, a hook is arranged on the outside of the end of the upper body above the opening and closing mouth, a buckle matched with the hook is arranged on the outside of the end of the lower body below the opening and closing mouth, two threaded holes are parallel and penetrate through the middle of the upper body, two compression screws are respectively connected with the two threaded holes in a threaded way, the bottom end of each compression screw comprises an arc compression sheet, and a puncture needle is fixedly arranged on the middle of the inner ring of the lower body. According to the invention, the method comprises the advantages of high security, extensive applicability, quick and convenient mounting and stable and reliable sampling signal.

The invention discloses a power transmission line transient current collecting device. The power transmission line transient current collecting device comprises a current sensing module, a collecting module, a traveling wave triggering module and a controller. The current sensing module is used for detecting the transient current of a power transmission line and outputting a corresponding traveling wave analog signal. The collecting module is used for performing analog-digital conversion on the traveling wave analog signal, and storing a converted traveling wave digital signal. The traveling wave triggering module is used for detecting whether the traveling wave analog signal exceeds a preset traveling wave threshold, if yes, emitting a first triggering signal and triggering the collecting module to stop the analog-digital conversion. The controller is used for reading and storing the traveling wave digital signal stored by the collecting module to a preset memory when the first triggering signal is detected. The current sensing module comprises a flexible Rogowski coil collecting a differential signal of the transient current and an active integral circuit restoring the differential signal output by the flexible Rogowski coil into the transient current. According to the invention, the sampling precision and reliability are improved, the traveling wave signal of the transient current can be restored effectively, and the fault of the power transmission line is precisely positioned.

A terahertz wave detector comprises a chopper (1) and a polyethylene lens (2) and is characterized by further comprising a neon lamp (3), wherein the neon lamp (3), a direct-current power supply (4) and an ampere meter (5) form a closed loop circuit. The output end of the neon lamp (3), a capacitor (6), an amplifier (7) and an oscilloscope (8) or a phase-locked amplifier (11) form a closed loop circuit. The chopper (1) is arranged in front of the polyethylene lens (2), the neon lamp (3) is arranged at the focus position of the polyethylene lens (2), and a modulating signal of the chopper (1) is input into the oscilloscope (8) to serve as a reference signal. The terahertz wave detector uses the cheap neon lamp as a detecting element, thereby reducing the production cost and improving the response speed. In addition, a response wave band is wide. When the power of terahertz waves is high, the detector is not damaged, and an equilibration phenomenon does not occur.

The invention relates to a nuclear phase device for substation lines and particularly relates to a nuclear phase device for GIS substation lines, which comprises a signal transmitter and a signal receiver. The signal receiver is connected with a flexible coil in a plugging mode through a coil lead. The flexible coil is provided with a gap, wherein a lock catch is arranged at the gap. The signal transmitter which is arranged on one end of a line transmits high frequent signals. The flexible coil is connected with a grounding end through a voltage transformer arranged at the other end of the line by the gap and induces the high frequent signals sent by the signal transmitter. Then the flexible coil amplifies through the signal receiver and displays in the form of numerical values to carry out the nuclear phase. The nuclear phase device for the GIS substation lines has the advantages of convenient use, safety and reliability, simple operation, easy transportation, strong ability in anti-interference, accurate nuclear phase in an environment with high induced voltage and high induced current, fast response, no saturation, small angle error, high measuring accuracy and small phase shift. The nuclear phase device for the GIS substation lines has wide range of frequency parts and ample output signals, which effectively solves the difficulty of the nuclear phase for the GIS substationlines.

The invention relates to the field of permanent magnet motors and discloses a permanent magnet motor. The permanent magnet motor comprises a shell, a stator core and a rotor core, wherein the stator iron core is circumferentially arranged along the inner wall of the casing, and the rotor iron core is installed in a space enclosed by the stator iron core; the rotor iron core comprises at least two full-bridge type lamination groups and at least one half-bridge type lamination group, and the laminations in the full-bridge type lamination groups comprise a plurality of full-bridge punching sheets which are connected with the first central connection bridges and are distributed along the circumferential direction; the laminations in the half-bridge type lamination groups comprise at least one separation punching sheet which is disconnected from a second central connection bridge and is distributed along the circumferential direction, and the full-bridge type lamination groups and the half-bridge type lamination groups are laminated along the axial direction, so each half-bridge type lamination group is positioned between two full-bridge type lamination groups; therefore, the adjacent sectors of the rotor core are asymmetric. The power density of the motor can be improved.

The invention discloses a shell activated carbon descaling ceramic material which comprises the following raw materials in parts by weight: 10-15 parts of shell powder, 7-12 parts of phosphate ore, 10-15 parts of zeolite, 20-25 parts of argil, 8-12 parts of silicon ore, 6-15 parts of stone needle, 10-15 parts of activated carbon, 9-12 parts of selenium ore and 8-15 parts of kieselguhr. According to the invention, shell powder and activated carbon are added; smashed shell powder and activated carbon are added as raw materials into a ceramic liner, so that the shell powder has an absorbing function, is free from saturability, is long in service life, can absorb hazardous substances for a long time and can protect health of families; the added phosphate ore and silicon ore can stabilize various carbonates in water, can convert water-insoluble calcium carbonate into water-soluble calcium hydrophosphate and can keep the water-soluble calcium hydrophosphate stable under heating state, so asto achieve the purpose of controlling scaling; a liner made from the ceramic material has the functions of healthcare, sterilization, absorption, water purification and scaling prevention.

The invention relates to an optical current transformer anti-interference method and an optical current transformer system, wherein a current detection module is arranged; the optical current transformer and the current detection module detect current signals of the same line; when the optical current transformer vibrates, and the current signal detected by the optical current transformer replacedwith the current signal detected by the current detection module to output the current signal detected by the current detection module. The system ensures that the system works normally when the optical current transformer vibrates, eliminates the influence caused by vibration interference, avoids the misoperation of a relay protection device, and is very suitable for a power system, particularlya high-voltage grade system. According to the scheme, the structure of the optical current transformer is not modified, so that the detection precision of the optical current transformer is not influenced; and the modification is made from the source, no matter what vibration the optical current transformer is subjected to, the current detection module can output normal current signals in a modeof replacing the optical current transformer, so that the detection precision is improved.

The invention relates to an on-site verification apparatus for an optical fiber current sensor, a usage method of the on-site verification apparatus and application of the on-site verification apparatus. The on-site verification apparatus for the optical fiber current sensor includes an optical fiber current detection sensing module and an optical fiber current detection processing and display module. The optical fiber current detection sensing module is composed of a light source, a linear polariscope, a polarization separator, a modulator, a transmission optical fiber, a 1 / 4 wavelength filter, an optical fiber sensing head, a reflector and a photoelectric detector. Proceeding from installation and debugging of the optical fiber current detection sensing module, the optical fiber current sensor on-site verification apparatus has reasonable control steps, is easy to operate, and can carry out efficient, economic and accurate error detection and quantity transmission on a DC heavy current sensor working on site for a long time; the optical fiber current sensor on-site verification apparatus is suitable for detecting and verifying a current detection sensor working on site for a long time in fields of electrolytic aluminum, electrolytic copper, electric smelting, electroplate and other electrochemical engineering; the on-site verification apparatus for the optical fiber current sensor is good in safety performance, large in measuring dynamic scope, high in frequency response degree, small in size and light in weight; and by adopting the on-site verification apparatus for the optical fiber current sensor, the measuring precision of a current detection apparatus can be raised, and needs of safety and stabilization of a power supply system are met.

The invention discloses a rapid charging pile harmonic wave detection device. The device comprises a current detection module, a filter group, a comparer and an indication module. The current detection module is used for detecting current signals in the circuit. The input end of the filter group is connected with the output end of the current detection module and the filter group is used for detecting each harmonic wave and each base wave of each current signal. The input end of the comparer is connected with the output end of the filter group. The comparer is used for judging the size between each harmonic wave and the corresponding base wave and outputting corresponding driving signals. The indication module is used for indicating corresponding frequency of harmonic waves exceeding the standard according to corresponding driving signals. The wave detection device is simple, practical and low in manufacturing cost.

The invention relates to a doubly-fed wind power hybrid direct current sending-out system alternating current fault control method and control system, an active power outer ring is transformed and optimized, when an alternating current fault occurs, an actual power instruction value of a wind generating set can quickly follow the grid-connected point output power of the wind generating set, and when the alternating current fault is cleared, the actual power instruction value of the wind generating set can quickly follow the grid-connected point output power of the wind generating set. The actual power instruction value of the wind generating set is gradually recovered to the power instruction value before the fault at a certain slope, and smooth processing is carried out on switching between a low-voltage fault ride-through link and a conventional active power control link, so that the wind generating set can stably and gradually recover output after the fault is cleared, and the power utilization rate of the wind generating set is improved. The power impact on the MMC is reduced, sufficient adjustment time is reserved for the MMC, and the phenomena that the voltage of the sub-module rises and serious overvoltage occurs on the direct current side and the alternating current side due to the fact that serious power surplus occurs in the MMC in the alternating current fault recovery period are avoided.

An electronic voltage transformer with capacity or resistance being series-connected to hollow coil is prepared as forming primary coil by hollow coil, series-connecting capacity or resistance in primary coil and connecting output end of secondary coil to induction voltage signal processing circuit.

The invention discloses a double-framework common-winding current transformer structure and a design method thereof, the current transformer structure comprises an ultracrystalline iron core and a silicon steel sheet iron core, the ultracrystalline iron core is a closed iron core, and the silicon steel sheet iron core is provided with an air gap. In the structural design of the current transformer, when the exciting current and the iron core error are solved, two conditions of opening and closing an iron core and an air gap iron core are solved respectively. The current transformer adopts a double-iron-core framework design, the iron core which is mainly used for protection is provided with an air gap, so that adverse effects caused by protection can be effectively avoided, a measurement function can be realized in case of low current, and when a power system has a fault and has relatively high current, the closed iron core for measurement is saturated, and the current flows through the air gap iron core, so that the measurement is realized. Because the magnetic resistance of the air gap iron core is far greater than the magnetic resistance of the closed iron core, a saturation phenomenon does not exist under a large current condition, so that large current monitoring can be realized to achieve a protection effect.

A multifunctional integrated high-pressure metering device is used for improving metering precision, and the volume and cost of the device are reduced. The technical scheme is that the multifunctional integrated high-pressure metering device comprises a three-phase voltage mutual inductor, a three-phase current mutual inductor, a metering control circuit and a high-voltage switch controlled by anelectric operation mechanism; the three-phase voltage mutual inductor and the three-phase current mutual inductor respectively collect the voltage and current signals of a high-voltage power supply circuit; the metering signals outputted by the three-phase voltage mutual inductor and the three-phase current mutual inductor are connected to the signal input end of the metering control circuit; thehigh-voltage switch is serially connected in the high-voltage power supply circuit; the control end of the electric operation mechanism is connected to the control signal output end of the metering control circuit. The device of the invention is integrally designed; while the metering precision is improved, the repeated setting of functional elements is avoided, so that the volume of the meteringdevice is decreased, and the manufacture cost is reduced.

The invention relates to the technical field of circuit breakers, and discloses a secondary fusion complete column-mounted circuit breaker synchronous measurement system. Thesecondary fusion complete column-mounted circuit breaker synchronous measurement system comprises a power-on module, an alternating current detection module, a direct current detection module, a contact detection module, a receiving module, a storage module, a processing module and a display module. The output end of the power-on module is connected with the input end of the alternating current detection module, the output end of the alternating current detection module is connected with the input end of the direct current detection module, the output end of the direct current detection module is connected with the input end of the contact detection module, and the output end of the contact detection module is connected with the input end of the receiving module. The output end of the receiving module is connected with the input end of the storage module, the output end of the storage module is connected with the input end of the processing module, the output end of the processing module is connected with the input end of the display module, and the display module and the power-on module work in a matched mode.

The invention relates to an optical current transformer anti-interference method and an optical current transformer system, wherein a current detection module is arranged; the optical current transformer and the current detection module detect current signals of the same line; when the optical current transformer vibrates, and the current signal detected by the optical current transformer replacedwith the current signal detected by the current detection module to output the current signal detected by the current detection module. The system ensures that the system works normally when the optical current transformer vibrates, eliminates the influence caused by vibration interference, avoids the misoperation of a relay protection device, and is very suitable for a power system, particularlya high-voltage grade system. According to the scheme, the structure of the optical current transformer is not modified, so that the detection precision of the optical current transformer is not influenced; and the modification is made from the source, no matter what vibration the optical current transformer is subjected to, the current detection module can output normal current signals in a modeof replacing the optical current transformer, so that the detection precision is improved.