• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In order to provide an electrically insulated and fluid-tight assembly for securing a current transformer to the inside of a dynamoelectric machine housing, a screw is inserted through an aperture in the machine's housing to secure the current transformer to a portion of the inner surface of the housing wherein a first insulating material is used to insulate the current transformer from the housing; a second insulator is used to insulate the screw from the housing; and an insulating cap is secured over the top of the screw. An O-ring provides a fluid-tight seal between the cap and the machine housing and a retaining ring is utilized to secure the cap over the screw's head within the machine housing. Secured to the lower part of the current transformer is a soft iron magnetic shield which is threaded to engage the screw and serves to support the current transformer.
    公开号:SU856398A3
    申请号:SU772519252
    申请日:1977-09-08
    公开日:1981-08-15
    发明作者:С.Линскотт Филлип (Младший)
    申请人:Сандстрэнд Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to electrical machines with an integrated current transformer, which is commonly used in three phase machines for measuring the current in each of the three phase neutral terminals in the main stator coils. Electric machines with an integrated current transformer tlD are known. However, current transformers are usually attached to the inner surface of the machine body with screws or bolts that pass through the machine body, resulting in quite often leakage of cooling oil from the inside of the body using injection cooling oil. . In addition, fastening the transformer with screws and bolts that build the case can be dangerous, because the montastic screws are often in contact with significant electrical potentials inside the machine. The purpose of the invention is to improve the reliability of sealing. To achieve this goal, the electric machine is equipped with two insulating elements and a Kuai, the first ionic element is made with a hole through which the fastening element passes and is installed under the head of the latter, the second insulating element is installed between the housing and the current transformer, it is made of insulating material and installed the opening of the housing of the electric machine and has a sealing element and an internal cavity in which the head of the fastening element is located. The sealing element can Sit is made in the form of an O-ring, or in the form of an Inta. In the case of the machine there is a groove perpendicular to the hole in which the retaining is located. At the bottom of the transform-. Torah 6ka installed a magnetic screen, in the threaded hole of which is placed a self-stitching insert. At 1, an electrical section is shown, a partial longitudinal section, including a longitudinal cross section of the current transformer mounting structure, the cross section in FIG. 2 - wiring diagram of the stator of an electric machine; in fig. 3 n "aspect of the magnetic screen containing a spiral coil used as a self-zapirakksegos insert.
    Inside the casing 1 (usually metal) there is a shaft 2 that supports the rotor 3 and is mounted on the casing 1 of the stator coil 4, electrically connected to the neutral wire 5. As in conventional three-phase AC machines, there are three neutral leads connecting the stator coils neutral clamp 6.
    On the schematic diagram of the machine, the stator circuit of the three-phase generator (figure 2) has 3 stator coils
    4.7, 8 and three current transformers 9-11. Current transformers 9-11 are used to measure the amount of current flowing in the neutral terminals.
    5. FIG. 2, the stator coil 4, the current transformer 9 and the terminals 5 and 12 correspond to the stator coil 4, the current transformer 9 and the terminals 5 and 12, respectively, of FIG. To protect the generator from electrical faults, frequencies, it is necessary to measure the current in each of the neutral leads. For this, the method of measuring the current in a neutral output using a current transformer, such as a coil 11, is widely used.
    The neutral lead 5 is connected to the transformer support element 13 in a spooled form, which serves to conduct a neutral current output through the center of the coil 9, and as a support for the coil 9. Preferably the support element 13 of the Coil is made of copper with maximum conductivity. A pin 12 is connected to the upper hook 14 of the support member 13, which connects a neutral current lead with a neutral clamp 6.
    The fastening device 14, for example a metal screw (Fig. 1), passes / through the opening 15 in the housing 1 of the machine. The housing 1 comprises an extended annular recessed area 16 coaxial with the opening 15 for accommodating the screw head 17 14. The spaced lower edge of the coil support element 13 is an annular element 17 of the screen of a transformer made of soft metal, which has an iBt coupling with a thread 19 for screw-screw connection 14. In addition to providing a mechanical screw connection 14, the element 17 acts as a magnetic shield to reduce the electrical effect on the coil 9 of the magnetic fields that generate pilots at the stator 4 .; In order for the screw 14 in the current transformer to be placed, there is a C-1 drop-in contribution, for example, a spiral coil 20 (fit-3). which is screwed on {n 19) into clutch 18, lto &
    prevent rotation of the screw or fastener 14 that occurs | From vibration.
    FIG. 3, the spiral coil 20 is shown partially inverted from the transformer screen 17, although usually the coil 20 must be completely inside the sleeve 18. The spiral coil may be made of diamond-shaped wire 21, which prevents the threaded member from rotating. In the preferred embodiment, the spiral tube 20 is screwed along the thread 19 into the sleeve 18, and the screw 14, in turn, is screwed into the spiral coil 20. Between the housing 1 and the upper edge of the support element
    13 coils are placed annular disk of insulating material 22 in order to isolate the support element 13 from the housing 1. In addition, using ring-shaped disks 23, as well as ring 24, the coil
    9 is insulated from the copper support member 13, and thus, as the coil 9 rotates, it is not in electrical contact with the support member 13.
    The upper part of the screw 14 is placed and isolated from the case 7 by means of an insulating washer 25, which also supports the head 17 of the screw 14. The insulator 25 contains a part of the coupling 26, which is located in the lower part of the hole 15 and serves to electrically isolate the screw from Enclosures 1. A cap 27 is attached to the screw head 17 of the enclosure. It is desirable that the cap 17 be made of an insulating material, such as molded plastic or metal, such as aluminum with an insulating varnish coating placed on the outer surface. The clamping ring 28, which is inserted inside the recess 29 into the annular part 16 of the housing 1, holds the cover 27 inside the annular part 16. The 0-ring 30 is placed in the recess 31 of the cover 27 and creates a liquid-tight seal that prevents the cooling oil from escaping through the screw 14 and housing 1 outward. Thus, the cover 27 in combination with the O-ring 30 serves as a seal. enclosures against leakage of the cooler and to protect the screw
    14 from entering the electrical contact with the wire that is outside the case, thereby eliminating any danger from the electrical potentials on the screw 14.
    权利要求:
    Claims (6)
    [1]
    1. An electric machine with a built-in current transformer, in which the case has an opening through which a mounting screw with a head passes, with which the current transformer is attached to the machine body, in order to increase the reliability of the sealing, the electric machine is equipped with two insulating elements and a cover, the first insulating element is made with a hole through which the fastener passes and is installed under the head of the latter, the second insulating element is installed between the body and the transport With a current format, the cover is made of an insulating material and is installed in the hole in the housing of the electric machine and has a sealing element and an internal cavity in which the head of the fastening element is located.
    [2]
    2. Machine according to Claim 1, characterized in that the sealing element is designed as a 0-ring.
    [3]
    3. The machine according to claim 1, so that the fastening element is designed in the form of a screw.
    [4]
    4. Machine pop. 1, characterized in that the body of the machine has a groove perpendicular to the hole in which the holding member is located
    in the form of a ring installed around the perimeter of the lid.
    [5]
    5. The machine according to claim 1, characterized in that it is provided with a magnetic screen mounted at the bottom of the current transformer, the screen has a threaded hole in which a self-locking liner is installed.
    [6]
    6. Machine on PP. 1 to 5, that is, the self-locking liner is a spiral coil.
    Sources of information taken into account in the examination
    1. Become J, K. Taulbee, - Westinghouse Engineer. 1971, 31, No. 1, 15-19, Fig.6.
    30 g 77
    I /
    15
    g1 f /
    go
    nineteen
    17
    fae
    类似技术:
    公开号 | 公开日 | 专利标题
    SU856398A3|1981-08-15|Electric machine with build-in transformer
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    US2742582A|1956-04-17|Gas-cooled high voltage bushing for large generator
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    US2311758A|1943-02-23|Electrical fitting
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    US3219860A|1965-11-23|Brush rigging for dynamoelectric machines
    SE7613984L|1977-06-20|ARRANGEMENT OF THE STRATCH POWER CONNECTIONS IN A HIGH POWER TURBO Generator
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    GB1489675A|1977-10-26|Generator having shielded current transformers positioned therein
    US2300195A|1942-10-27|Electrical apparatus
    US2359186A|1944-09-26|Electric apparatus
    US4030057A|1977-06-14|Inductive voltage transformer
    同族专利:
    公开号 | 公开日
    GB1541540A|1979-03-07|
    IL52648A|1982-04-30|
    JPS5333322A|1978-03-29|
    CA1064562A|1979-10-16|
    FR2364561A1|1978-04-07|
    FR2364561B1|1982-06-18|
    IL52648D0|1977-10-31|
    US4054856A|1977-10-18|
    DE2718331A1|1978-03-09|
    JPS6333377B2|1988-07-05|
    DE2718331C2|1985-09-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US1736994A|1927-02-01|1929-11-26|Westinghouse Electric & Mfg Co|Current transformer|
    DE604257C|1931-06-28|1934-10-17|Aeg|Low-voltage switchgear, especially encapsulated switchgear|
    GB498756A|1937-07-09|1939-01-09|British Sangamo Co Ltd|Improvements in or relating to construction of electrical transformers|
    US3175174A|1961-04-11|1965-03-23|Gen Electric|Centering and fastening means for internally supported transformer|
    FR1293745A|1961-05-25|1962-05-18|Thomson Houston Comp Francaise|Further training for processors|
    FR1517094A|1967-02-03|1968-03-15|Ind Electr De La Seine L|Improvements to toroidal detection and measurement transformers|
    JPS447960Y1|1967-06-22|1969-03-27|
    US3525964A|1968-08-15|1970-08-25|Federal Pacific Electric Co|Zero-phase-sequence transformer|
    US3742411A|1971-10-15|1973-06-26|Westinghouse Electric Corp|Core and coil with protective covering|
    JPS494914U|1972-04-13|1974-01-17|
    JPS4924991U|1972-06-05|1974-03-02|
    US3867657A|1974-03-29|1975-02-18|Westinghouse Electric Corp|Generator having shielded current transformers positioned therein|US4321493A|1980-04-02|1982-03-23|Sundstrand Corporation|Current transformer support assembly|
    DE3140221A1|1981-10-09|1983-08-11|Wilhelm Sedlbauer GmbH Fabrik für Feinmechanik und Elektronik, 8000 München|HOLDING DEVICE FOR WINDING RING CORES|
    JPH0220807Y2|1984-04-25|1990-06-06|
    US4754250A|1985-08-05|1988-06-28|Firma Wilhelm Sedlbauer Gmbh|Holding device for toroidal cores provided with windings|
    US4689546A|1985-12-18|1987-08-25|General Electric Company|Internal armature current monitoring in large three-phase generator|
    JPH0445223Y2|1987-10-27|1992-10-23|
    US4968912A|1989-08-21|1990-11-06|Sundstrand Corporation|Single piece punched and bent neutral lead|
    DE4113198A1|1991-04-23|1992-10-29|Oplaender Wilo Werk Gmbh|ELECTRIC MOTOR, IN PARTICULAR CANOPY MOTOR FOR A CENTRIFUGAL PUMP OR A FAN|
    EP0510252B1|1991-04-26|1995-06-07|International Business Machines Corporation|Coaxial isolation mounting of a toroidal transformer|
    CA2055109A1|1991-11-07|1993-05-08|Eugene Y. G. Yao|Explosion resistant, oil insulated, current transformer|
    US5307043A|1992-09-14|1994-04-26|Square D Company|Transformer assembly with improved retainer and insulator|
    ES1049585Y|2001-07-10|2002-04-16|Aparellaje Electrico Sl|TACO TO EMPOTRAR|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/721,256|US4054856A|1976-09-08|1976-09-08|Current transformer assembly for dynamoelectric machines|
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