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

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 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 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 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.