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Inductive device and manufacturing method thereof

A technology of inductance device and structure, applied in the direction of circuit devices, emergency protection circuit devices, inductors, etc., can solve the problems of limiting the allowable power of coils, heavy molding resin, low thermal conductivity, etc., and achieve size reduction and simple manufacturing Effect

Inactive Publication Date: 2010-02-03
SWEDISH NEUTRAL AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One problem with molded resin is that molded resin is heavy and requires a lot of resin around the coil
In addition, molded resin has low thermal conductivity, which severely limits the allowable electrical power in the coil compared to an oil-insulated device of the same size

Method used

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  • Inductive device and manufacturing method thereof
  • Inductive device and manufacturing method thereof
  • Inductive device and manufacturing method thereof

Examples

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Embodiment Construction

[0032] exist figure 1 In , a polyphase AC power network 1 is shown, which is arranged to distribute electricity. The power grid 1 comprises three coils 3 , which can be, for example, three coils in a transformer or in a generator generating the alternating current of the power grid. The three coils 3 coincide at zero point 5, and the potential at zero point 5 is zero during normal operation. Other types of mains coils can be connected in such a way that the zero point is not obtained. In this case, zero points can be generated using a zero point former. Zero formers are well known in the art.

[0033] exist figure 1 In , a ground fault 7 between the first conductor 9a of the power network and ground 11 is shown. Such a ground fault 7 may occur, for example, if a tree falls on the conductor 9a, or if a conductor falls on the ground 11 . This ground fault7 can also occur if the conductor is placed below the ground and there are holes in the insulation of the conductor. ex...

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PUM

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Abstract

The invention relates to an inductive device (27) intended to be connected to a multiple phase alternating current power network in connection with a zero voltage point of the power network. The device comprises a coil (35) having an induc not tance and which is connected between the power network and an earth potential, wherein the device (27) is designed to allow a reactive current through thecoil (35) in connection with a possible earth fault. The invention also relates to a method for manufacturing such an inductive device.

Description

technical field [0001] The invention relates to an inductive device intended to be connected to a polyphase alternating current power network, said inductive device being connected to the zero voltage point of the power network. The inductive means comprises a coil and is arranged to allow reactive current to pass through the coil connected to a possible ground fault. The invention also relates to methods of producing such devices. Background technique [0002] Multiphase AC power grids are used to transmit power over long distances. A polyphase AC power network comprises at least two, but usually three electrical conductors, each carrying alternating current. The phases of the alternating current are displaced relative to each other so that their combined potential is zero. The point where the conductors are connected to each other is called a null point because the potential at this point is zero. Such zeros are typically found at the generators that produce the altern...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/08
CPCH01F27/288H01F30/04H01F30/06H01F37/00H02H9/08H01F27/2823H01F27/42H01F2027/2833
Inventor 托尔斯滕·许特克劳斯·温特
Owner SWEDISH NEUTRAL AB
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