阅读说明：本技术 一种252kV GIS用三相共箱式电流互感器 (Three-phase common-box type current transformer for 252kV GIS ) 是由 王汉徽 徐园园 赵伟 李强 于 2020-12-09 设计创作，主要内容包括：本发明涉及输变电设备领域,具体的讲是一种252kV GIS用三相共箱式电流互感器,包括单相电流互感器、端头盖板、吸附剂罩、球阀、密度继电器,左侧气隔绝缘子与互感器外壳之间设有变径筒,电流互感器支持筒安装在互感器外壳的内部,右侧气隔绝缘子与互感器外壳相连,电流互感器支持筒的右端与右侧气隔绝缘子之间设有屏蔽罩,接线盒将密封端子板固定在互感器外壳上,端头盖板安装在互感器外壳的上端,吸附剂罩和球阀装设在端头盖板上,密度继电器安装在球阀上。与现有技术相比,简化了三相电流互感器结构,可应用于252kV及以上电压GIS产品,且内部共用一个密封端子板,提高了CT的可靠性,又显著降低了制造成本。(The invention relates to the field of power transmission and transformation equipment, in particular to a three-phase common-box type current transformer for a 252kV GIS, which comprises a single-phase current transformer, an end cover plate, an adsorbent cover, a ball valve and a density relay, wherein a reducer is arranged between a left gas-insulated insulator and a transformer shell, a current transformer supporting cylinder is arranged inside the transformer shell, a right gas-insulated insulator is connected with the transformer shell, a shielding cover is arranged between the right end of the current transformer supporting cylinder and the right gas-insulated insulator, a terminal box fixes a sealing terminal block on the transformer shell, the end cover plate is arranged at the upper end of the transformer shell, the adsorbent cover and the ball valve are arranged on the end cover plate, and the density relay is arranged on the ball valve. Compared with the prior art, the three-phase current transformer structure is simplified, the three-phase current transformer can be applied to 252kV and above voltage GIS products, a sealing terminal board is shared inside the three-phase current transformer, the reliability of CT is improved, and the manufacturing cost is obviously reduced.)

1. The utility model provides a 252kV GIS is with box current transformer altogether of three-phase, includes single-phase current transformer, transformer shell (6), sealed terminal board (9), terminal box (10), end apron (13), adsorbent cover (14), ball valve (16), density relay (17), its characterized in that: three single-phase current transformers are arranged in a transformer shell (6) in parallel, each single-phase current transformer comprises a left air-insulated insulator (1), a contact seat (2), a reducer cylinder (3), a conducting rod (4), a current transformer supporting cylinder (5), a current transformer coil (7), a transformer outgoing line (8), a right air-insulated insulator (11) and a shielding cover (12), the contact seats (2) are arranged on the left air-insulated insulator (1) and the right air-insulated insulator (11), the conducting rod (4) is arranged on the contact seats (2), the left air-insulated insulator (1) is connected with one end of the reducer cylinder (3), the other end of the reducer cylinder (3) is connected with the transformer shell (6), the current transformer supporting cylinder (5) is arranged in the transformer shell (6), the left end of the current transformer supporting cylinder (5) is fixed in the transformer shell (6), the right side gas-insulated insulator (11) links to each other with mutual-inductor shell (6), be equipped with shield cover (12) between the right-hand member of current transformer support barrel (5) and right side gas-insulated insulator (11), install on current transformer support barrel (5) current transformer coil (7), the one end of current transformer lead-out wire (8) is drawn forth from current transformer coil (7), the other end is connected with sealed terminal board (9), terminal box (10) are fixed sealed terminal board (9) on mutual-inductor shell (6), the upper end at mutual-inductor shell (6) is installed in end apron (13), install on end apron (13) adsorbent cover (14) and ball valve (16), density relay (17) are installed on ball valve (16).

2. The three-phase common-box type current transformer for the 252kV GIS according to claim 1, wherein: and the adsorbent cover (14) is filled with an adsorbent (15).

3. The three-phase common-box type current transformer for the 252kV GIS according to claim 1, wherein: the transformer shell (6) is a welded shell or a cast shell.

4. The three-phase common-box type current transformer for the 252kV GIS according to claim 1, wherein: the inside of the current transformer supporting cylinder (5) is an independent air chamber.

5. The three-phase common-box type current transformer for the 252kV GIS according to claim 1, wherein: the three single-phase current transformers share one density relay (17).

Technical Field

The invention relates to the field of power transmission and transformation equipment, in particular to a three-phase common-box type current transformer for a 252kV GIS.

Background

GIS is because area is little, and the reliability is high, and the security is strong, and more quilt state net adopts and replaces traditional high-voltage switch technique. The current transformer is one of the most important components of the GIS, is used for measuring and protecting the GIS, is distributed on two sides of a circuit breaker in the GIS, and has a built-in structure and an external structure, wherein the built-in structure is mainly used.

The built-in current transformer structure of the current 252kV GIS factory is mainly divided into two categories: one type is a three-phase three-cylinder type current transformer which is used by most GIS manufacturers at present; the other type is a three-phase one-cylinder type current transformer which can only be used together with a three-phase common-box isolation combination switch, but the isolation combination switch applied to a bus side does not meet the requirement that a GIS bus isolation switch with 252kV and above is forbidden to adopt a design structure which is in common with a bus in eighteen measures of a national grid, and is only applied by ABB and domestic individual manufacturers at present.

According to the latest acceptance requirements of national grids, namely ' the breaker and the current transformer require air distribution chambers ', the original three-phase three-cylinder ' type current transformer of the box-divided GIS needs one air chamber for each phase current transformer, and is additionally provided with an adsorbent, an explosion-proof sheet and a density relay, so that the structure of a product is complicated, and the cost is obviously increased.

Therefore, it is necessary to design a three-phase common-box type current transformer for 252kV GIS.

Disclosure of Invention

The invention breaks through the difficult problems in the prior art and designs the three-phase common-box type current transformer for the 252kV GIS.

In order to achieve the purpose, the invention designs a three-phase common-box type current transformer for a 252kV GIS, which comprises a single-phase current transformer, a transformer shell, a sealing terminal board, a junction box, an end cover plate, an adsorbent cover, a ball valve and a density relay, wherein the three single-phase current transformers are arranged in the transformer shell in parallel, the single-phase current transformer comprises a left air-insulated insulator, a contact seat, a reducer cylinder, a conducting rod, a current transformer supporting cylinder, a current transformer coil, a transformer outgoing line, a right air-insulated insulator and a shielding cover, the contact seats are respectively arranged on the left air-insulated insulator and the right air-insulated insulator, the conducting rod is arranged on the contact seat, the left air-insulated insulator is connected with one end of the reducer cylinder, the other end of the reducer cylinder is connected with the transformer shell, the current transformer supporting cylinder is arranged inside the transformer shell, and the left end of the current, the right side gas-insulated insulator links to each other with the mutual-inductor shell, is equipped with the shield cover between the right-hand member of current transformer support section of thick bamboo and the right side gas-insulated insulator, and the current transformer coil is installed on the current transformer support section of thick bamboo, and the one end of current transformer lead-out wire is drawn forth from the current transformer coil, and the other end is connected with sealed terminal board, and the terminal box is fixed sealed terminal board on the mutual-inductor shell, and the end apron is installed in the upper end of mutual-inductor shell, and adsorbent cover and ball valve are installed on the end apron.

The adsorbent cover is filled with adsorbent.

The transformer shell is a welded shell or a cast shell.

An independent air chamber is arranged inside the current transformer supporting cylinder.

The three single-phase current transformers share one density relay.

Compared with the prior art, the invention simplifies the structure of the three-phase current transformer, can be applied to 252kV and above voltage GIS products, and shares a sealing terminal board in the interior, thereby improving the reliability of CT and obviously reducing the manufacturing cost.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a top view of the present invention.

Detailed Description

The invention is further described with reference to the accompanying drawings.

With reference to fig. 1-2, the invention designs a three-phase common-box type current transformer for a 252kV GIS, which comprises a single-phase current transformer, a transformer housing 6, a sealed terminal board 9, a junction box 10, an end cover plate 13, an adsorbent cover 14, a ball valve 16, and a density relay 17, wherein three single-phase current transformers are installed in the transformer housing 6 in parallel, the single-phase current transformer comprises a left air-insulated insulator 1, a contact base 2, a reducer cylinder 3, a conductive rod 4, a current transformer support cylinder 5, a current transformer coil 7, a transformer lead-out wire 8, a right air-insulated insulator 11, and a shielding cover 12, the contact base 2 is installed on the left air-insulated insulator 1 and the right air-insulated insulator 11, the conductive rod 4 is installed on the contact base 2, the left air-insulated insulator 1 is connected with one end of the reducer cylinder 3, the other end of the reducer cylinder 3 is connected with the transformer housing 6, the transformer housing, the current transformer supporting cylinder 5 is arranged inside the transformer shell 6, the left end of the current transformer supporting cylinder 5 is fixed in the transformer shell 6, the right side air-insulated insulator 11 is connected with the transformer shell 6, a shielding cover 12 is arranged between the right end of the current transformer supporting cylinder 5 and the right side air-insulated insulator 11, the inside of the current transformer supporting cylinder 5 is an independent air chamber, the current transformer coil 7 is arranged on the current transformer supporting cylinder 5, one end of a current transformer lead-out wire 8 is led out from the current transformer coil 7, the other end is connected with a sealing terminal board 9, the sealing terminal board 9 is fixed on the transformer shell 6 by a junction box 10, an end cover plate 13 is arranged at the upper end of the transformer shell 6, an adsorbent cover 14 and a ball valve 16 are arranged on the end cover plate 13, an adsorbent 15 is filled in the adsorbent cover 14, and a density relay 17 is arranged, and three single-phase current transformers share one density relay 17.

According to the invention, the three-phase mutual inductors share one sealed terminal board 9, so that the structure is simplified, and the reliability of CT is improved; different from common current transformers, the invention does not have a communicating air pipe, but adopts an air-insulated insulator, a shielding case 12, a ball valve 16 and the like, thereby not only ensuring the sealing property in the transformer, but also ensuring the insulation distance and reducing the manufacturing cost.