Bundled current transformer for GIS and manufacturing method of transformer
A current transformer, integrated technology, applied in the direction of inductors, transformers/inductor coils/windings/connections, circuits, etc., can solve the problems affecting product performance, axial movement, heavy weight of secondary coils, etc. Appearance quality, guaranteed reliability, optimized effect of strapping structure
Active Publication Date: 2013-02-13
CHINA XD ELECTRIC CO LTD +1
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
However, the epoxy casting process of the current transformer with this structure is complicated, the workload is large, the process time is long, the secondary coil is heavy, and the cost is high, and the coil is prone to radial rotation and axial displacement during transportation or vibration during circuit breaker operation. movement, affecting product performance
Method used
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Embodiment Construction
[0027] The present invention is described in further detail below in conjunction with accompanying drawing:
[0028] see Figure 1 to Figure 7 As shown, a bundled current transformer for GIS includes a coil 7, a casing 9, a shielding cylinder 10, a shielding cover 13, a connecting plate 17, a pressing plate 18, a polyurethane castable 19, a φ7 sponge rubber strip 20, an insulating washer 21, The terminal board 22 and the terminal box 23 are sealed. The coil 7 includes an iron core 1 , a thin cotton tape 2 , a polyester film 3 , an enameled wire 4 , a white PVC tape 5 and a lead wire 6 . The iron core 1 is provided with a thin cotton tape 2, a first polyester film layer, and an enameled wire 4 in sequence, and the enameled wire 4 is sequentially provided with a second polyester film layer, a white PVC tape 5, and a third polyester film layer from inside to outside. film layer. The bundled current transformer for GIS is a three-phase common box structure. The three phases ar...
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Abstract
The invention discloses a bundled current transformer for a GIS (Gas Insulated Switchgear) and a manufacturing method of the transformer. The current transformer comprises coils, a shell, a shielding barrel, a shielding cover and a connection board, wherein each coil orderly comprises an iron core, a thin cotton tape, a first polyester film layer, a varnished wire, a second polyester film layer, a white PVC (polyvinyl chloride) tape and a third polyester film layer from inside to outside; the shielding barrel is provided with an insulating washer, the insulating washer is provided with several coils sleeved on the shielding barrel, and a sponge rubber strip is arranged between the neighboring coils; and the polyurethane castable is used for sealing the space between the coils and the insulating barrel in a pouring manner. According to the bounded current transformer, the bounded structure of the coils are optimized, the sponge rubber strips are placed when the coils are stacked, and the coils are pre-pressed by toolings, thus gaps among the coils are avoided, and the castable is prevented from permeating out among the coils when pouring; and the coils and the inside of the CT are shielded in a manner of polyurethane single-face pouring sealing, thus the coils and the shielding barrel are glued together, and the coils are prevented from rotating or moving axially in during transportation.
Description
【Technical field】 [0001] The invention relates to the field of high-voltage electrical appliances, in particular to a bundled current transformer for GIS and a preparation method thereof. 【Background technique】 [0002] As one of the important components of Gas Insulated Switchgear (GIS for short), the current transformer unit adopts an epoxy casting structure, and the current transformer of this structure encapsulates the secondary coil with epoxy resin. The mechanical strength of the coil is improved, which can ensure that the performance of the assembled coil will not change under the action of external force. However, the current transformer epoxy casting process of this structure is complicated, the workload is large, the process time is long, the secondary coil is heavy, and the cost is high, and the coil is prone to radial rotation and axial displacement during transportation or vibration during circuit breaker operation. movement, affecting product performance. 【C...
Claims
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IPC IPC(8): H01F38/30H01F27/36H01F27/29H02B13/035
Inventor 吴薇杨育京赵华锋马小琴
Owner CHINA XD ELECTRIC CO LTD