18results about "Resistor electrostatic/electromagnetic shielding" patented technology

This utility model relates to a surge arrester shielding device, including an insulating cover. The insulating cover comprises two bodies, which are combined to form a platform shape. The interior of the insulating cover is hollow, and both the top and bottom ends are missing. A connecting plate is provided on the outer side of each of the two bodies, and the two connecting plates are hinged together by a hinge shaft. A locking assembly is provided on the outer side of the two bodies, opposite to the connecting plate. This surge arrester shielding device uses a platform-shaped shielding cover with different opening diameters at the top and bottom. It can fit onto the outer side of surge arrester flanges of different sizes, eliminating the need for custom-made insulating covers for different sizes of surge arresters. When the flange diameter varies within a certain range, the platform-shaped conical shielding cover can adaptively wrap by adjusting its height. This avoids the problems of traditional cylindrical insulating covers being too loose and causing leakage, or too tight and difficult to install, which are caused by fixed dimensions. It significantly reduces the types of spare parts and lowers equipment management costs.

The utility model discloses an electrostatic shielding aluminum shell resistor which comprises an electrostatic aluminum shell resistor machine, the electrostatic aluminum shell resistor machine comprises a shielding shell, a first sliding groove is formed in the upper end of the interior of the shielding shell, and a second sliding groove is formed in the lower end of the interior of the shielding shell. The interior of the first sliding groove is slidably connected with a first sliding rod, the interior of the second sliding groove is slidably connected with a third sliding rod, and the shielding shell is tightly connected with the sliding rods of the resistor body to form a relatively closed environment, so that propagation of electromagnetic waves penetrating through pores and gaps is reduced; the shielding effectiveness on a high-frequency electromagnetic field can be remarkably enhanced, electromagnetic interference is reduced, and the performance and stability of the whole circuit are improved.

A ceramic electronic component (101) comprises a laminate (1) that is formed by laminating a plurality of ceramic layers and has a bottom surface (3) and a plurality of lateral surfaces. A GND terminal (16) and an IO terminal (17) are disposed on the bottom surface. Eighty percent or more of the total area of the plurality of lateral surfaces is covered by a shield film (8) electrically connected to the GND terminal (16). The bottom surface (3) includes a flat plane. The GND terminal (16) is disposed to reach the outer periphery of the flat plane. The IO terminal (17) is disposed separately from the outer periphery of the flat plane.

The invention discloses a resistor with adjustable pin positions, which comprises a first conduction part and a second conduction part, and the first conduction part and the second conduction part can be relatively and rotatably connected through a rotating shaft structure, so that the leading-out directions of a first pin and a second pin can be flexibly adjusted. Meanwhile, the shaft body, the sleeve body and the insulating ring in the rotating shaft structure are matched, so that smooth rotation is ensured, a coaxial current conduction structure is formed, magnetic field interference is reduced, and the measurement accuracy and stability of the resistor in a circuit are improved. In addition, the locking structure can fix the first pin and the second pin at required relative positions. According to the resistor disclosed by the invention, the universality and applicability are greatly improved, the circuit design and debugging cost is reduced, and convenience is provided for compact layout and flexible wiring of a circuit board.

The invention relates to the technical field of field suppression resistors, in particular to a field suppression resistor material based on silicon carbide and a preparation method of the field suppression resistor material. The modified silicon carbide is prepared by adding silicon carbide powder, a sodium hydroxide solution, 3-thiopropyltrimethoxysilane, deionized water and absolute ethyl alcohol. The conductive filler is prepared by adding graphite powder, a strong acid mixed solution, polyvinyl alcohol, an ascorbic acid solution and silver nitrate. And mixing the modified silicon carbide, a conductive filler and absolute ethyl alcohol, and carrying out ball milling and drying to obtain the composite silicon carbide. And performing chemical vapor deposition on the pretreated silicon carbide to form a diamond nano layer to obtain the composite heat-conducting powder. Adding sodium silicate, deionized water, composite heat-conducting powder and composite silicon carbide to obtain a mixed material; and pressing and sintering the mixed material, and coating the metal slurry on the surface to obtain a finished product. The finished product prepared by the invention has excellent heat-conducting property, so that the finished product has a wide application prospect in the technical field of de-excitation resistors.

The utility model relates to an explosion-proof lightning arrester for switch equipment and the switch equipment with the explosion-proof lightning arrester, the explosion-proof lightning arrester comprises a lightning arrester shell, the lightning arrester shell comprises a transverse shell and a vertical shell extending from the transverse shell along the vertical direction, the transverse shell is provided with a connecting opening, and the vertical shell is provided with a mounting cavity extending along the vertical direction; the upper conductive terminal is arranged on the transverse side, far away from the switch equipment main body, of the connecting opening and vertically extends out of the connecting opening until entering the upper side of the mounting cavity; the shielding sleeve is sleeved on the periphery of the section, extending out of the connecting opening, of the upper conductive terminal and extends out of the lower end surface of the upper conductive terminal along the vertical direction; the lightning arrester core body is arranged in the mounting cavity and is in close contact with the lower end surface of the upper conductive terminal; and the lower conductive terminal is arranged in the mounting cavity and is in close contact with the lower end surface of the lightning arrester core body, and the lower conductive terminal is in close joint with the vertical shell and can be separated from the vertical shell when high-pressure gas is generated in the vertical shell due to high-pressure current.

The invention provides a thermistor. According to the thermistor, a thermistor body is wrapped in a glass shell, and a specially-made signal lead extends into the glass shell to be connected with an electrode of the thermistor. The signal lead is sequentially provided with a nickel-iron wire core, a copper plating layer, a connecting layer and a gold plating layer from inside to outside, and the connecting layer is a nickel plating layer or a nickel alloy plating layer. The thermistor not only can comprehensively protect the thermistor body from being damaged in a humid and corrosive environment, but also can isolate water vapor through the inert gold-plated layer on the outer layer while ensuring that the signal lead and the glass shell have similar temperature expansion coefficients, and copper ion migration of the copper-plated layer for transmitting signals is inhibited. In addition, the gold plating layer is matched with the connecting layer, so that the electric signal of the thermistor is not interfered by an electromagnetic environment during transmission, and the transmission quality of the signal is effectively improved. The thermistor provided by the invention has the advantages of moisture resistance, corrosion resistance, high working reliability and electromagnetic environment interference resistance.

The utility model relates to the technical field of safety piezoresistors and discloses a safety piezoresistor which comprises an insulating block, a ceramic block is fixedly connected to the outer wall of the insulating block, an insulating sleeve is fixedly connected to the outer wall of the ceramic block, filler is fixedly connected to the lower surface of the insulating sleeve, and a protection assembly is arranged on the outer wall of the insulating sleeve. The protection assembly is used for protecting the pins, and the outer wall of the filler is fixedly connected with a waterproof sleeve. The protection assembly comprises a protection sleeve, the outer wall of the protection sleeve is fixedly connected to the outer wall of the insulation sleeve, and pins are fixedly connected to the interior of the protection sleeve. According to the utility model, the ceramic block on the outer wall of the insulation block has good insulation performance and can preliminarily block interference of an external electric field, a magnetic field and the like and prevent the interference from influencing internal elements, and the insulation sleeve on the outer wall of the ceramic block further enhances the insulation effect and forms a double-layer insulation barrier, so that the influence of external factors on the internal elements can be effectively reduced.

The invention belongs to the field of lightning arresters, and particularly relates to a shielding type plug-in lightning arrester with an electricity testing function. The lightning arrester is provided with an electricity testing terminal; the electricity testing terminal is installed on the peripheral side of the upper flange, the tail end of the electricity testing terminal sequentially penetrates through the upper flange and the outer insulating layer to be electrically connected with the inner shielding layer, and the electricity testing terminal is electrically insulated from the upper flange and the outer insulating layer. According to the invention, the electricity testing terminal is electrically connected with the internal shielding layer and is insulated from the external shielding layer. When the lightning arrester operates normally, the live-line indicator can be connected to the live-line testing terminal so as to display whether the lightning arrester is live-line or not. In addition, a partial discharge tester can be connected to the electricity verification test terminal, the partial discharge capacity of the lightning arrester can be detected without dismounting the lightning arrester, the workload is small, and the test cost is low.

The utility model is suitable for the technical field of piezoelectric ceramic wafers, and provides a variable resistor body, the variable resistor body is connected with a first lead-out wire, a second lead-out wire and a third lead-out wire, and the first lead-out wire and the second lead-out wire are connected to two ends of the variable resistor body to form a flowing current area. The third leading-out wire is connected to the middle position or another specific point of the variable resistor body to form a non-flowing current area, a first capacitor is connected between the end point of the first leading-out wire and the ground and used for absorbing interference signals sensed by the non-flowing current area, and a second capacitor is connected between the end point of the second leading-out wire and the end point of the third leading-out wire and used for absorbing interference signals sensed by the non-flowing current area. The first lead-out wire is used for forming an alternating-current loop and reducing interference signals superposed at the end point of the first lead-out wire; through the arrangement of the first leading-out wire, the second leading-out wire and the third leading-out wire and the arrangement of the first capacitor and the second capacitor, the accuracy of resistance change signals is integrally improved, the signal processing speed is increased, and the influence of interference signals is reduced.

The application belongs to the technical field of power system protection and safe operation, and discloses a damping resistor for compact GIS and a cable line charge discharge device. The resistor module composed of multiple series resistors is arranged in the tank, and the two ends are connected by shielding covers and insulating pots, so that the integration packaging of the high damping resistor is realized. In the resistor, the series resistor structure disperses the voltage stress, the shielding cover uniformizes the electric field, and the insulating part prevents short circuit. The compact design ensures high resistance while greatly reducing the volume. The resistor effectively solves the bottleneck of large volume of damping resistor in the large-capacity cable line without high resistance, provides sufficient damping to suppress LC oscillation, accelerates the discharge of residual charge, avoids the damage of voltage transformer caused by impact current, and thus improves the system safety and recovery efficiency, and adapts to emerging working condition requirements.

The utility model relates to the technical field of circuit protection, in particular to a non-inductive lead-free winding resistor suitable for a high-frequency circuit, which comprises a resistor body, the resistor body comprises a base, a resistance wire is arranged on the surface of the base, a shielding cover is arranged on the outer surface of the base, the shielding cover is coated outside the resistance wire, and the resistance wire is arranged in the shielding cover. The non-inductive leadless winding resistor comprises a base, a resistance wire is arranged in the base, a shielding cover is arranged in the base, an identification layer for identification is arranged on the surface of the shielding cover, two ends of the base are fixedly connected with a pair of electrodes, and the electrodes are electrically connected with two ends of the resistance wire respectively. Therefore, the inductive effect of the resistor itself is almost completely eliminated, and inductive reactance caused by magnetic field interference is avoided. Therefore, the resistor can work stably in a high-frequency circuit, the influence on the phase and the amplitude of the signal is extremely small, and the quality and the transmission stability of the signal are effectively guaranteed.

The invention discloses a portable multifunctional dummy load resistor for pulse source debugging, and solves the problems that the resistance value of an existing resistive dummy load is unstable, or the rated power is low, and the large current impact stability is poor. The bottom end of the insulation outer cylinder is closed, the top of the insulation outer cylinder is covered with the grounding metal ring, the insulation inner cylinder is arranged in the insulation outer cylinder, the N resistor assemblies are arranged in the insulation outer cylinder and distributed around the insulation inner cylinder, and the high-voltage cable plug connector and the coil assembly are arranged on the top of the grounding metal ring. N > = 3; the device is compact in structure and flexible to move, can simultaneously realize three functions of dummy load, voltage measurement and current measurement, is suitable for debugging hundreds of kV pulse sources, and is convenient to carry.

The application provides a thermistor. The thermistor wraps a thermistor body in a glass shell, and adopts a special signal lead wire to extend into the glass shell to connect electrodes of the thermistor. The signal lead wire has a nickel-iron wire core, a copper plating layer, a connecting layer and a gold plating layer from inside to outside. The connecting layer is a nickel plating layer or a nickel alloy plating layer. The above thermistor can comprehensively protect the thermistor body from damage in a humid and corrosive environment, and can ensure that the signal lead wire and the glass shell have similar temperature expansion coefficients, and can isolate water vapor through the inert gold plating layer on the outer layer to inhibit copper ion migration of the copper plating layer for signal transmission. In addition, the cooperation of the gold plating layer and the connecting layer can prevent the electric signal of the thermistor from being disturbed by the electromagnetic environment during transmission, and effectively improve the transmission quality of the signal. The thermistor provided by the application has the advantages of moisture resistance, corrosion resistance, high working reliability and anti-electromagnetic environment interference.

The invention relates to a power resistor unit (1) which has an integrated electromagnetic interference damping function. The direct integration of at least one inductance element (4) into the resistor element (2) or within the power resistor unit (1) results in an effective damping of electromagnetic emissions which arise when switching the resistor element (2). This integration makes it possible to combat electromagnetic interference at the source thereof.

The present invention comprises a power resistor unit (1) equipped with integrated electromagnetic interference suppression. By directly integrating at least one inductor element (4) into the resistor element (2) or within the power resistor unit (1), effective suppression of electromagnetic emissions generated during switching of the resistor element (2) is achieved. This integration enables the mitigation of electromagnetic interference at its source.

The invention discloses a multistage fin superposition heat dissipation type pre-charging resistor, and relates to the technical field of pre-charging resistors, the multistage fin superposition heat dissipation type pre-charging resistor comprises a metal aluminum shell, the inner side of the metal aluminum shell is provided with a resistor structure, the resistor structure comprises a resistor main body, the outer side of the resistor main body is packaged with an insulating layer, the outer side of the insulating layer is packaged with a filler layer, and the outer side of the filler layer is provided with a shielding layer. A heat dissipation assembly is arranged on the metal aluminum shell, the heat dissipation assembly comprises a plurality of air inlet square pipes, the multiple air inlet square pipes are arranged between the resistor bodies, the tops of the resistor bodies are connected with air outlet pipes in a penetrating mode, and second fins, first fins and waved plates are arranged on the outer sides of the air outlet pipes; the air inlet square pipes are distributed at the snakelike back-bending position of the resistor body in a staggered mode and cooperate with the first flow deflector and the second flow deflector to guide air in a partitioned mode, air flowing between the resistor body is accelerated, meanwhile, the first fins and the second fins on the outer side of the air outlet pipe are arranged in a stacked and staggered mode and cooperate with the top waved plate to form a three-dimensional heat dissipation space, and the problem that a traditional pre-charging resistor is insufficient in heat dissipation is solved.