JPS61193415A - Reactor - Google Patents

Abstract

PURPOSE:To form the reactor with which the dielectric breakdown caused by the overvoltage induced on a non-current applied winding by a method wherein a voltage suppressing liqhtening arrestor and a switch are series-connected, they are formed in a set and connected between each winding terminal. CONSTITUTION:Windings 1 and 2 are formed in parallel or in series, terminals 3 or 5 is led out, and terminals 3-5 are selected. The circuit wherein a voltage suppressing lightening arrestor 7 and a switch 6 are series-connected, is connected between terminals 4 and 5 using an inductance or a capacity-variable reactor. The dielectric breakdown can be prevented by the abnormal voltage added to the winding 1 or the induction voltage applied to the winding 2 by the entering lightening surge by turning ON the switch 6 when current is not applied to the winding 2.

Description

[Detailed Description of the Invention] Field of Application of the Invention] □ The present invention provides protection against dielectric breakdown by providing a frost protector for suppressing excess pressure in order to avoid high voltage induced in windings that are not energized. Regarding the reactor.

[Background of the invention]

・Conventionally, (Japanese Unexamined Patent Publication No. 15591.0/1989), as shown in FIGS. 4 and 5, a plurality of windings 1 and 2 are provided concentrically and surrounded by a magnetic shield 10, and the necessary゛To obtain the inductance or required capacity; □Select the winding to be energized and connect it to an external power source. When there is a winding that is not energized, a voltage is induced in that winding by the magnetic flux linkage of the energized winding.The voltage is determined by the turns ratio, but in a variable capacitance reactor, there is a non-energized winding. The voltage between terminals 3 and 4, or between terminals 3 and 5 or 5' of the windings generated is equivalent to or higher than that of the winding. There was a risk of destruction.

[Purpose of the invention]

An object of the present invention is to provide a reactor that prevents dielectric breakdown due to overvoltage induced in non-current-conducting windings when a plurality of windings installed concentrically are used as variable capacitance or variable inductance. .

[Summary of the invention]

The key point of the present invention is that when an overvoltage occurs in a reactor having multiple windings installed concentrically, a voltage suppressing arrester and a switch are connected between the terminals of each winding to suppress the voltage. be.

[Embodiments of the invention]

The present invention will be explained using an air-core reactor shown in FIGS. 1 and 2.

Winding 1. By connecting terminals 2 in parallel or series, pulling out terminals 3 to 5, and selecting terminals 3 to 5, the voltage suppressing arrester 7 and the switch 6 are connected in series with a reactor whose inductance or capacity is variable. Connect the circuit between terminals 4 and 5.

According to this embodiment, by closing the switch 6 when the winding 2 is not energized, the abnormal voltage of the system applied to the winding 1 can be reduced.
Alternatively, dielectric breakdown can be prevented by magnetic pressure induced in the winding 2 by an incoming lightning surge.

In the figure, lO is a magnetic shield, 11 is the outermost winding of the three windings, and 12 is a reactor storage tank.

In FIG. 3, the voltage suppression arrester 7 and the switch 6 in FIGS. 1 and 2 are all linked together, and the switching switch 8 for selecting the winding to be energized is interlocked.

That is, when only the winding 1 is energized, the switching switch 8 selects the terminal A, and the switch 6 is interlocked and closed. When both windings 1 and 2 are energized, the switching switch 8 selects terminal B, and at the same time, the switch 6 becomes open.

In this way, it is possible to select the winding when not energized and at the same time protect against abnormal voltage.

This embodiment can be adapted to a plurality of windings, and the same effect can be obtained whether the windings are connected in series or in parallel.

The same applies to iron core reactors.

〔Effect of the invention〕

According to the present invention, when an overvoltage is induced in the winding when it is not energized due to an abnormal voltage rise in the system or a lightning surge, the resistance becomes extremely small, so that high voltage is not applied between the terminals. 1. dielectric breakdown can be prevented.

[Brief explanation of drawings]

Fig. 1 is a plan view of the air-core model of the present invention, Fig. 2 is a sectional view of the air-core model of the invention, Fig. 3 is a sectional view of a modification and application example of the invention, and Fig. 4 is an air-core model of the conventional structure. FIG. 5 is a cross-sectional view of a conventional structure with three air-core windings. 1...Inner winding, 2...Outer winding, 1o...Magnetic shield.

Claims (1)

[Claims] 1. In a reactor having a plurality of windings arranged concentrically and connected in series or in parallel, each winding is provided with a terminal so that the winding to be energized can be selected, A reactor characterized in that a voltage suppressing lightning arrester and a switch are connected in series as a set, and connected between each winding terminal. 2. The reactor according to claim 1, wherein the switch is opened when the winding is energized and closed when the energization is energized. 3. Claim 1 or 2 is characterized in that a switching switch is provided that allows selection of the winding to be energized, and the switching switch and the switching switch are interlocked. reactor. 4. A reactor according to claim 1 or 2, characterized in that the voltage suppression arrester and the switch are housed in a tank.