30results about How to "No partial discharge" patented technology

The invention relates to a preparation method of a silicon nitride ceramics ring for a polysilicon reduction furnace, comprising the following steps: weighing various raw materials, and stirring in media to obtain evenly mixed slurry; after the slurry is dried, prilling to prepare base stock; pressing and shaping to prepare a green body; processing by a lathe or a grinder into preset shape and size; sintering the processed green body into an atmosphere pressure sintering furnace; and carrying out finish machining to a sintered finished product to obtain the ceramics ring finished product. Thepreparation method has the beneficial effect that silicon nitride ceramics ring has good insulativity, high toughness, and good thermostability and antiknock characteristic, the service life can be prolonged, and added agglomerant is favourable for densification. The invention can satisfy environment use requirement of a polysilicon reduction furnace, has long service life and improves work efficiency.

The invention relates to an inductive power-taken high-voltage power verifying displayer and aims to solve the problem that the conventional high-voltage power verifying display device is deficient. The inductive power-taken high-voltage power verifying displayer comprises a passive induction power-taken part, wherein the passive induction power-taken part is connected to a reception controlling module; the reception controlling module is connected to a trigger displayer; the passive induction power-taken part, the reception controlling module and the trigger displayer are connected to an inductive power-taken device; the inductive power-taken device is connected with a storage battery rectifying circuit; the storage battery rectifying circuit is connected with a storage battery; the passive induction power-taken part is mounted on high-voltage electrical equipment; the inductive power-taken device is a plate condenser positioned in an alternating electric field. According to the invention, the mounting and maintenance are simple and convenient, the normal operation of a power network cannot be influenced, a power source doesn't need to be added, and the inductive power-taken high voltage power verifying displayer is suitable for working environment indoors and outdoors.

The invention discloses a four-in-one mica tape, which comprises a first polymer thin film, a reinforced fiber cloth, mica paper and a second polymer thin film, wherein the layers of materials are adhered by using a high temperature resistant adhesive. The invention further discloses an insulating method for applying the four-in-one mica tape to a motor leading-out wire connection part. The four-in-one mica tape provided by the invention replaces ordinary mica tapes and serves as wrapping insulation materials for the leading-out wire connection part, has excellent flexibility, is tightly attached to the leading-out wire connection part of a high-voltage motor, is high in tensile strength, and is not prone to crumple; further, the internal structure of the four-in-one mica tape is even, compact and voidless, is not prone to be layered, and has good moisture-proof effect. By adopting the insulating method provided by the invention, the insulation structure of the leading-out wire connection part is fully sealed and insulated integrally, the interior of the insulation structure is compact and voidless, and partial discharge cannot be produced.

The invention provides a lightning protection high-voltage live-line digital display and blocking apparatus. The apparatus comprises a sensor, an input protection unit, a lightning arrester, a filter, a signal processing unit, an output driving unit, an LED display screen and a blocking contact, wherein the sensor is connected with the input protection unit, the input protection unit is successively connected with the filter, the signal processing unit and the output driving unit through a lead wire, the output driving unit is respectively connected with the LED display screen and the blocking contact through the lead wire, and a self-check unit and the lightning arrester are respectively connected between the input protection unit and the filter through the lead wire. In case of stormy weather or normal weather, the apparatus can be used for indicating live-line conditions and size of voltages of high-voltage equipment and can also block correlation electrical equipment in a forced mode, so that the operation safety of switch electrical equipment is improved, output voltage data is synchronized to a monitoring room, and real-time monitoring is realized.

The invention discloses a casting mould for a high-voltage coil for a dry-type transformer, which comprises an inner mould and an outer mould, wherein the inner mould is arranged in a vacuum chamber, and the outer mould is arranged on the outer layer of the inner mould. The casting mould for the high-voltage coil for the dry-type transformer is characterized in that the upper ends and the lower ends of the inner mould and the outer mould are respectively provided with bottom plates connected with the end parts of the inner mould and the outer mould; a coil casting cavity is formed among the inner mould, the outer mould and the bottom plates; the outer mould is provided with a casting hole; the casting hole is also provided with a coil outlet template; and the coil outlet template is locked on the outer mould through fixed sword iron. By adopting the casting mould for the high-voltage coil for the dry-type transformer, the structure is simple, and the use is convenient; the coil can be conveniently cast and shaped under a vacuum condition; partial discharge does not happen; the coil has the excellent property of not generating bubbles; after being manufactured and shaped, the produced coil can be easily taken out, and the product precision is accurate. Moreover, the labor strength of workers is reduced, the labor cost is saved, and the production efficiency is improved. Moreover, the casting mould for the high-voltage coil for the dry-type transformer is highly flexible and is easy to popularize and apply.

The invention relates to an arrangement having a sensor body (7a) and a frame (1). The sensor body (7a) is disposed on the frame (1). The frame (1) has flanges (13). The sensor body (7a) has a sensitive surface (8) that is coaxially bent relative to an axis (2). The flanges (13) protrude over the sensitive surface (8). An insulating material body (3) surrounded by the frame (1) is incorporated into the frame (1) in fluid form, and solidifies in the frame (1).

The invention discloses a voltage guiding device, a sealing device and a method for manufacturing an insulating hydrophobic coating layer. The surface of the voltage guiding device is coated with an insulating hydrophobic coating layer for increasing a surface contact angle. The voltage guiding device comprises a lead, an external mounting flange, an internal mounting flange, an outer side grading shield, and an inner side grading shield. The lead penetrating a wall body of a sealing device is used for guiding a needed voltage into the inside of the sealing device. The external mounting flange is installed at the outer side of the wall body; and a screw hole for fixation is arranged at the connection part of the external mounting flange and the outer side of the wall body, thereby realizing fixed connection between a guiding rod and the wall body. The internal mounting flange is installed at the inner side of the wall body; and a screw hole for fixation is arranged at the connection part of the internal mounting flange and the inner side of the wall body, thereby realizing fixed connection between the guiding rod and the wall body. The outer side grading shield is connected to the external mounting flange detachably in a covering mode; and the inner side grading shield is connected to the internal mounting flange detachably in a covering mode. Therefore, a high voltage can be guided safely to carry out a high-humidity environment voltage test and corona discharging caused by water drops can be prevented effectively.

The invention provides a shielding box for a high potential control panel of a high-power thyristor device. The shielding box comprises a substrate A, a substrate B, a side plate A and a side plate B. The substrate A and the substrate B are connected to form a cuboid frame with a semi-closed space, and the side plate A and the side plate B are respectively arranged on two sides of the cuboid frame perpendicular to the substrates and are provided with cooling fins. The high potential control panel of the thyristor device is fixed on the side plate B through four nylon struts, a square heat conduction silica gel piece adheres between the high potential control panel and an inner wall of the side plate B, a rectangular groove is formed in the substrate A and used for placing the high potential control panel, and a square heat conduction silica gel piece adheres between the high potential control panel and the rectangular groove. Compared with the prior art, the shielding box for the high potential control panel of the high-power thyristor device is of a compact plug type structure, has good shielding performance, is resistant to dust and dirt, meets the electromagnetic compatibility test requirements, is high in heat dissipation efficiency and free of partial discharge and improves reliability of the control panel.

The invention relates to a 3-35kV electromagnetic multi-functional voltage transformator which comprises an iron core, a primary winding and a main secondary winding; the primary winding and the main secondary winding are wound on the iron core; an auxiliary secondary winding is also wound on the iron core; and a tap is arranged on the auxiliary secondary winding. According to the voltage transformator, the auxiliary secondary winding with the tap is additionally arranged on the iron core, so that the functions of a grounded transformator and a non-grounded transformator are realized on the same transformator, and the 3-35kV electromagnetic multi-functional voltage transformator has a simple and compact structure, low losses and no local discharge, is convenient to use, has high safety performance, is maintenance-free, and is applicable to 3-35kV voltage systems.

The invention discloses a switching device for a high voltage loop. The switching device for the high voltage loop comprises a low voltage end, a high voltage end and a connection unit, wherein the low voltage end is connected to a low voltage loop and is used for receiving a control signal from the low voltage loop; the high voltage loop is switched off or conducted under the control of the control signal; the high voltage end comprises a high voltage end cavity; a gap in the high voltage end cavity is totally filled with a solid insulated filler; the connection unit comprises a first end and a second end; the first end is connected to the low voltage end; the second end is connected to the high voltage end. By the switching device, partial discharge cannot be generated when a switch controls a high voltage power transmission system to carry out safe conduction and switching-off operations.

The invention belongs to the field of dry type reactor, in particular to a wire and foil mixedly winding coil grounding transformer, comprising an iron core, a high pressure coil and a support frame, wherein, the high pressure coil comprises an inner coil and an outer coil; an airway is arranged between the inner coil and the outer coil; the inner coil adopts an enameled flat type copper wire as a conductor to wind in separated layers; a vacuum dipping glass grating plate is arranged between each layer; an inner connecting terminal which is used for coating a high pressure shrinkable tube is arranged respectively at two ends of the inner coil; the outer coil adopts copper foil to serve as the conductor to wind in separated layers; an electric insulating basal membrane is arranged between each circle; the two ends of the outer coil are provided with outer connecting terminals; the middle part is provided with a tapping terminal; and the inner side of the inner coil, the inner side and the outer side of the outer coil are respectively wound with an insulating layer. In the invention, the interturn capacitance of the transformer is distributed in equalization; and the invention has excellent electric insulating performance of no partial discharge and thunder impact resistance and is mainly applied to a 10-35 kV power grid grounding protection system.

The invention relates to an arrangement having a sensor body (7a) and a frame (1). The sensor body (7a) is disposed on the frame (1). The frame (1) has flanges (13). The sensor body (7a) has a sensitive surface (8) that is coaxially bent relative to an axis (2). The flanges (13) protrude over the sensitive surface (8). An insulating material body (3) surrounded by the frame (1) is incorporated into the frame (1) in fluid form, and solidifies in the frame (1).

The invention discloses a surface acoustic wave temperature sensor with a locking device. The surface acoustic wave temperature sensor comprises an outer cover, a sensor antenna, a sensor temperature sensing chip, a printed board, a metal bottom plate, a locking mechanism and a metal ribbon, the metal cable ties comprise the first metal cable tie and the second metal cable tie, one end of the first metal cable tie is connected to one side of the metal bottom plate in a buckled mode, and the other end of the first metal cable tie is connected to the adjusting part of the locking mechanism. One end of the second metal cable tie is buckled and connected to the other side of the metal bottom plate, and the other end of the second metal cable tie is connected to the fixing part of the locking mechanism; the locking mechanism is configured to adjust the length of the first metal cable tie between the metal bottom plate and the locking mechanism through the adjusting part; the printed board is welded and fixed on the metal bottom plate, and the sensor temperature sensing chip and the sensor antenna are welded on the printed board and are connected through a microstrip line on the printed board; and the outer cover is arranged outside the sensor antenna and is fixed on the metal bottom plate.

The invention relates to a preparation method of a silicon nitride ceramics ring for a polysilicon reduction furnace, comprising the following steps: weighing various raw materials, and stirring in media to obtain evenly mixed slurry; after the slurry is dried, prilling to prepare base stock; pressing and shaping to prepare a green body; processing by a lathe or a grinder into preset shape and size; sintering the processed green body into an atmosphere pressure sintering furnace; and carrying out finish machining to a sintered finished product to obtain the ceramics ring finished product. Thepreparation method has the beneficial effect that silicon nitride ceramics ring has good insulativity, high toughness, and good thermostability and antiknock characteristic, the service life can be prolonged, and added agglomerant is favourable for densification. The invention can satisfy environment use requirement of a polysilicon reduction furnace, has long service life and improves work efficiency.

The cable wire system for high voltage cable oscillation wave partial discharge detection system comprises a side connection mechanism of units under test, a side connection mechanism of solid switches and high voltage connecting lines, wherein the side connection mechanism of units under test includes a connecting piece of units under test and a first cable connector and the connecting piece of units under test is connected with the units under test. The side connection mechanism of solid switches includes a solid switch connecting piece and a second cable connector and the solid switch connecting piece is connected with the solid switch. The two ends of high voltage connecting line are respectively connected with the first cable connector of the side connection mechanism of units under test and the second cable connector of the side connection mechanism of solid switches. The system is simple in structure. Further, the cable wire system is not easy to generate corona and to discharge through the design which the cable wire part has a large distance from cable oscillation wave testing device, so that the system is stable and reliable in connection, capable of no partial discharge and beneficial to site test.

The invention discloses a voltage guiding device, an enclosing apparatus, and a manufacturing method of an insulating hydrophilic coating. The surface of the voltage guiding device is coated with an insulating hydrophilic coating material. The voltage guiding device comprises a lead, an external mounting flange, an internal mounting flange, an outer side grading shield, and an inner side grading shield. The lead penetrating the wall body of the enclosing apparatus is used for guiding a needed voltage into the inside of the enclosing apparatus. The external mounting flange is arranged at the outer side of the wall body and a screw hole for fixation is arranged at the connection part of the external mounting flange and the outer side of the wall body; and the external mounting flange is fixedly connected with a guiding rod and the wall body. The internal mounting flange is arranged at the inner side of the wall body and a screw hole for fixation is arranged at the connection part of the internal mounting flange and the inner side of the wall body; and the internal mounting flange is fixedly connected with a guiding rod and the wall body. The outer side grading shield is connected to the external mounting flange detachably in a covering mode. The inner side grading shield is connected to the internal mounting flange detachably in a covering mode. Therefore, a high voltage can be guided securely to carry out high-humidity environment voltage testing and thus water drops absorbed to the surface can be laid to form a water film in a wetting mode, thereby preventing a corona discharging phenomenon caused by the water drops effectively.

Disclosed is a PDP wherein the configuration of the periphery of a protection film is improved, excellent secondary electron emission characteristics are exhibited, and high efficiency and long service-life can be expected. Furthermore, generation of a discharge delay is eliminated when the PDP is being driven, and high-quality image display performance can be expected even in the high-speed driven and highly fine PDP. Specifically, on the dielectric layer (7) surface on the discharge space side, a crystalline film is formed as a protection film (8) to be a surface layer having a film thickness of approximately 1 [mu]m, said crystalline film having Sr at a concentration of 11.8-49.4 mol% added to CeO2. On the crystalline film, high-[gamma] fine particles (17) having secondary electron emission characteristics higher than those of the protection film is disposed, thereby improving the secondary electron emission characteristics, luminance, efficiency and reliability of the protection film.