JPH0982539A - Neutral grounding reactor apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the fabrication by providing a non-inductive winding auxiliary coil to provide a pure resistance on the outside, upper and lower side of a main coil to provide a reactor and resistance. SOLUTION: A reactor coil 1 formed as an air core coil has a main coil 2 inside and auxiliary coil 3 outside in a case 4 which has an insulation oil or inert gas sealed therein and a bushing 5 for leading a circuit to outside. The main coil 2 is composed of a conductor formed as a coil and the coil 3 is composed of an extension of this conductor to form a non-inductive winding structure with an additional conductor 10 so as to flow currents in reverse directions on the adjacent conductors connected at a grounding point 9. This facilitates fabrication of the coil as the main coil is integrated with the resistor and allows the installation space to be reduced as the apparatus is compact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a neutral grounding reactor device.

[0002]

2. Description of the Related Art Recently, in congested areas such as urban areas,
It is difficult to secure space for the substation,
In order to store the equipment in a limited space, it is necessary to reduce the size of the equipment. Moreover, not only is the device compact, but the cost of the device is also being reviewed, and it is necessary to manufacture a device that is easy and inexpensive to manufacture. FIG. 4 is a configuration diagram of a conventional neutral grounding reactor device. The main coil 2 in the container 4 is connected to the resistor 6 via a lead wire 11,
It is connected to a bushing 5 for drawing the circuit out of the container 4. Since the direct current component is superimposed on the ground fault current generated when the system is short-circuited to the ground fault, the resistor 6 requires a resistance of 10% of the impedance of the main coil 2 and the auxiliary coil 3 in order to quickly attenuate the direct current component. And The resistor 6 is composed of a resistor body 8 in which bent resistor plates 7 are connected to each other as shown in FIG.

[0003]

However, the resistor 8 has a structure in which there are many connecting points between the resistor plates 7 and it takes time to manufacture. Therefore, the present invention uses the main coil 2
It is an object of the present invention to provide a neutral point grounded reactor device which is integrated with the resistor 6 and can be manufactured at the same time.

[0004]

The neutral point grounded reactor device of the present invention is provided with a non-induction winding auxiliary coil for obtaining resistance only outside, above or below a main coil for obtaining resistance with the reactor. And

[0005]

According to the above construction, the resistance of the winding can be adjusted by generating only resistance by the non-inductive winding auxiliary coil and combining it with the reactor and the main coil for obtaining resistance.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a neutral point grounding reactor device according to a first embodiment of the present invention. In this figure, a reactor coil 1 formed as an air-core coil is housed in a container 4 with a main coil 2 inside and an auxiliary coil 3 outside. Insulating oil or inert gas is enclosed in this container 4, and a bushing 5 for attaching the circuit to the outside is attached. The main coil 2 is formed in a coil shape with one conductor wire, and the auxiliary coil 3 has the non-induction winding structure by continuously using the one conductor wire forming the main coil 2, so that the additional conductor wire 10 is added. The two conductors are connected to each other by the ground point 9 so that the opposite currents flow in the adjacent conductors.
If the main coil 2 forms an air-core coil with a conductive wire in order to obtain a required reactance, the existing resistance exists according to the formula, but the existing resistance of the main coil 2 alone cannot obtain a resistance value of 10% of the impedance. Since the transient DC current generated at the time of a system ground fault cannot be early attenuated, the auxiliary coil 3 obtains a resistance component of the main coil 2 and a resistance component capable of early attenuation of the transient DC current.

In the above, the length of the conductor wire of the reactor coil 1 is determined by the following equation. R = ρL / A ... where R: resistance value of reactor coil 1 ρ: specific resistance value of conductor wire A: cross-sectional area of conductor wire L: length of conductor wire

The length of the conductor that attenuates the transient direct current is
The length of the conductor wire for obtaining the required reactance in the main coil 2 can be calculated by the formula
As a matter of course, since it is shorter than the difference, the length of the resistance component of the difference can be supplemented by the auxiliary coil 3, and the transient DC current component at the time of a system fault can be early attenuated. Since the main coil 2 and the auxiliary coil 3 use the same conductive wire, they can be integrated, which facilitates manufacturing. Further, the temperature rise during current application is also the same, and by integrating the resistor 6 and the main coil 2 shown in FIG. 5, the device can be made compact and the installation space of the device can be reduced.

FIG. 2 is a block diagram of the neutral grounding reactor device according to the second embodiment of the present invention. In FIG. 2, a reactor coil 1 formed as an air-core coil has a structure in which a main coil 2 is arranged in an upper part and an auxiliary coil 3 is arranged in a lower part, and is housed in a container 4. The main coil 2 is formed into a coil shape with a single conductor wire, and the auxiliary coil 3 is formed by adding the additional conductor wire 10 to the adjacent conductor wire in order to continuously use the conductor wire of the main coil 2 to form a non-inductive winding structure. The two wires are connected by the connecting wire 9 so that the current flows in the opposite direction. When an air-core coil is formed by a conductive wire for the main coil 2 in order to obtain a required reactor, the existing resistance exists from the formula, but the resistance value of 10% of the impedance cannot be obtained only by the existing resistance of the main coil. Since the transient DC current generated in the power failure cannot be attenuated early, the resistance value of 10% of the impedance is obtained by the resistance component of the main coil and the auxiliary coil 3. FIG. 3 is a configuration diagram of a neutral-point grounding reactor device according to a third embodiment, in which the main coil 2 is provided below and the auxiliary coil 3 is provided.
Is arranged on the upper side to form the reactor coil 1.

[0010]

According to the present invention, the following effects can be obtained. 1) The main coil and the resistor are integrated to facilitate the production of the reactor coil. 2) Installation space can be reduced by downsizing the equipment. 3) The resistor is simplified and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a neutral grounding reactor device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a neutral-point grounding reactor device showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a neutral point grounding reactor device showing a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional neutral grounding reactor device.

FIG. 5 is a detailed view of a conventional resistor.

[Explanation of symbols]

 1 Reactor coil 2 Main coil 3 Auxiliary coil 4 Container 5 Bushing 6 Resistor 7 Resistor plate 8 Resistor 9 Connection point 10 Additional conductor wire 11 Lead wire

Claims (2)

[Claims] 1. A neutral grounding reactor device in which a main coil for obtaining reactance and resistance is provided inside a winding, and a non-inductive winding auxiliary coil for obtaining resistance only is provided outside. 2. A neutral grounding reactor device in which a non-inductive winding auxiliary coil for obtaining only resistance is arranged above or below a main coil for obtaining reactance and resistance.