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 capacitor partial discharge detection circuit is used for detecting high-voltage capacitor partial discharge signals. The technical solution is: the detection circuit includes a self-balancing coupling transformer, an inductor and a capacitor, the self-balancing transformer is composed of an iron core and three coils, the first coil and the second coil have the same structure, and the head end of the first coil is The unbalanced input terminal is connected to the test power supply through the capacitor of the test product, and its tail end is connected to the tail end of the second coil through the inductor, and connected to the first end of the second coil through the capacitor. The first end of the second coil is connected to the signal common end, and the third The partial discharge signal output from both ends of the coil is connected to the partial discharge tester. The invention can work in two test modes of unbalanced and balanced. In both test modes, the partial discharge pulse current signal can be separated when the impedance magnetic core is close to zero magnetic flux, and the balanced coupling transformer will not appear saturation phenomenon. , so the magnitude of the main loop current will not affect the PD detection sensitivity.

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 plug-and-play series power quality compensator and a compensation control method thereof, belonging to the field of power compensators. The compensator uses the voltage detection module to detect the real-time voltage on the load side and the feedback voltage generated by the voltage applied by the inverter on the secondary side of the special transformer; the special transformer includes a primary winding and a secondary winding, and the primary winding serves as The busbar is connected to the power grid, and the secondary side windings are closely stacked along the axial direction, and are connected to the output terminal of the inverter control module; the input terminal of the inverter control module is connected to the DC side voltage, and the control terminal of the inverter control module is connected to The output end of the voltage detection module, the inverter control module is used to output the feedback control voltage for the secondary side of the transformer according to the reference voltage signal. The invention is simple to connect and has no influence on the structure of the power grid itself, and the control method is flexible and changeable, and can be applied to the requirements of different scenarios.

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 provides an optical fiber vibration identification system based on a phi-OTDR technology and an optical fiber vibration identification method thereof. The monitoring distance of the system is greatly enhanced through a dual-path detection structure; the adaptability of the system for environmental noise changes is enhanced by the method of characteristic threshold dynamic updating, and a vibration event is accurately positioned; background noise in signals can be greatly reduced through spectral subtraction noise reduction under the condition of maintaining the signal characteristic and energy of the vibration signals, and the signal-to-noise ratio of the signals and the sensitivity of system detection can be enhanced; and multi-characteristic parameter mode identification is performed on the vibration signals from the time domain and the wavelet domain so that the influence of other complex time-dependent interference noise can be effectively avoided, the correct rate of vibration event detection and vibration type classification can be enhanced, the false alarm rate of the system can be reduced, the detection performance of a vibration detection system based on the OTDR technology in the actual complex noise environment can be enhanced, and the national major project application requirements in the aspects of boundary safety and long-distance pipeline safety can be met.

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 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 the field of a permanent magnet motor and discloses a high-power density permanent magnet motor. The motor comprises a casing, a stator core and a rotor core, wherein the stator core is arranged along the circumferential direction of an inner wall of the casing, the rotor core is mounted in the space enclosed by the stator core, the rotor core comprises at least two full-connection bridge type lamination groups and at least one semi-connection bridge type lamination group, laminations in the full-connection bridge type lamination group comprise a plurality of full-connection bridge punching sheets which are connected with a first central connection bridge and are distributed along the circumferential direction, laminations in the semi-connection bridge type lamination group comprise at least one separation punching sheet which is disconnected with a second central connection bridge and is distributed along the circumferential direction, and the full-connectionbridge type lamination groups and the semi-connection bridge type lamination group are stacked in the axial direction, so each semi-connection bridge type lamination group is positioned between the two full-connection bridge type lamination groups, and adjacent sectors of the rotor core are asymmetric. The motor is advantaged in that power density of the motor can be improved.

The invention discloses a continuous current dynamo speed derivative feedback control device and method. The device is composed of a touch screen, a programmable controller, a digital-to-analog conversion module, a power driving unit, a servo object, an optical-electricity encoder and a high-speed counter module, wherein the servo object is composed of a continuous current dynamo and a mechanical load. The control method comprises the steps of inputting a speed digital quantity command signal after initializing an integrator, reading a feedback signal of the optical-electricity encoder, conducting first difference operation on the feedback signal, conducting second order difference operation on the first difference signal, multiplying the result and a second order difference coefficient to obtain a second order difference product, calculating the error between the input speed digital quantity command signal and the sum of the first difference operation result and the second order difference product, conducting accumulated integration on an error signal obtained, multiplying the result and an integral coefficient to obtain an integral product, and conducting digital-to-analog conversion on the integral product to obtain an analog quantity control signal to control the servo object through a servo amplifier.

The invention relates to the field of a permanent magnet motor and discloses a built-in permanent magnet motor. The motor comprises a casing, a stator core, a rotor core and a permanent magnet, wherein the rotor core comprises at least two full-connection bridge type lamination groups and at least one semi-connection bridge type lamination group, laminations in the full-connection bridge type lamination groups comprise a plurality of full-connection bridge laminations which are connected with a first central connection bridge and are distributed along the circumferential direction, laminationsin the semi-connection bridge type lamination group comprise at least one separation punching sheet which is disconnected with the second central connection bridge and is distributed along the circumferential direction, and the full-connection bridge type lamination groups and the semi-connection bridge type lamination group are stacked in the axial direction, so each semi-connection bridge typelamination group is located between the two full-connection bridge type lamination groups, adjacent sectors in the same lamination layer of the full-connection bridge type lamination groups are asymmetric, and the permanent magnets are placed in grooves between the adjacent sectors. The motor is advantaged in that the production process of the motor can be simplified, and the structural strength of the motor can be improved.

The invention discloses a repair method of heavy metal polluted soil based on a blade eccrine mechanism. Heavy metal enrichment plants with a blade eccrine function are planted in the heavy metal polluted soil; leaching liquid collecting devices are arranged at base parts of all the heavy metal enrichment plants with the eccrine function; during raining or leaching, blade eccrine heavy metal is leached, and is recovered through the leaching liquid collecting devices; and the leaching liquid collecting devices comprise leaching liquid collecting discs sleeving the base parts of the plants, leaching liquid collecting ports formed in the bottoms of the collecting discs, and leaching liquid storage barrels positioned below the leaching liquid collecting ports. Heavy metal pollutants can be continuously extracted from the soil to prevent poison and harm caused by excessive accumulation of the heavy metal in the plants; and heavy metal cleaning liquid is simply treated after concentration, so that the trouble of treating a lot of plant residues is prevented, and the risk of secondary pollution is prevented.