JPS59178713A - Variable reactor - Google Patents

Abstract

PURPOSE:To significantly improve transient stability of inductance by inserting a non-magnetic reservoir for accommodating magnetic fluid into a part of ring- shaped iron core and continuously changing amount of inductance through adjustment of amount of magnetic fluid. CONSTITUTION:A tanks 8 and 9 are filled with a high pressure gas such as N2 gas and the surface of magnetic fluid 11 is equilibrated through pressure balance. When gas pressure is lowered by opening a valve 13B of tank 8, the fluid 11 in the tank 8 increases and inductance of reactor also increases. On the contrary, when gas pressure is lowered by opening a valve 13A of tank 9, the fluid 11 in the tank 8 reduces and inductance of reactor also reduces. Here, a compressor 14 is used for always filling the tanks 8 and 9 with high pressure gas. An inductance can be changed continuously by adjusting the amount of inductance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable reactor whose inductance can be continuously changed from zero.

A general conventional example of a variable reactor is the system shown in FIG. 1A and 1B are terminals, 2 is an axle main body, and a plurality of taps 3 drawn out from the middle of the coil are changed over by a tap changer 4.

Next, the operation of the circuit shown in FIG. 1 will be explained. The inductance of the reactor body 2 is changed by switching the taps 3 using a tap changer 4. However, the first
In the case of the conventional variable reactor shown in the figure, the tap 3 of the reactor body 2 is
Since the inductance is not switched continuously, the change in inductance is gradual. Secondly, when switching the tap 3 in the energized state, spark discharge is inevitable and the contacts of the tap changer 4 are worn out.

Thirdly, when the current flowing to the load increases, tap 3
There are limits to switching, making it extremely difficult. The fourth is tap 3
There were drawbacks such as a switching surge that occurred when switching, causing noise disturbances.

The present invention has been made to eliminate the above-mentioned drawbacks, and in order to continuously and as quickly as possible change the magnetic resistance of an annular core whose inductance is variable by changing the magnetic fluid, the magnetic fluid is transferred. The object of the present invention is to provide a variable reactor whose inductance can be continuously changed from zero by controlling the inductance.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 2, the same parts as in FIG.
Similarly, 6 is the second coil. 7 is an annular iron core and the first
The coil 5 and the second coil 60 are magnetically coupled to each other. 8 is a first container made of a non-magnetic material such as aluminum, and 9 is a second container. The first container 8 and the second container 9 are connected by a pipe 10. 11 is the first container 8
, a magnetic fluid stored in the second container 9 and the piping 10 in communication with each other. Further, 12A and 12B are the first containers 8
13 is a gas valve that controls the gas pressure of the high-pressure gases 12A and 12B; and 14 is a compressor, through which the gas is fed under pressure through gas piping 15.

Next, the operation of the present invention will be explained below. Considering the case where the magnetic fluid 11 does not exist in the first container 8 made of a non-magnetic material constituting the leakage magnetic path, the inductance I, a between the terminals 1 and 18 is expressed by the following equation.

La; Inductance of the glue handle when the magnetic fluid 11 is not present in the first container 8 made of non-magnetic material Lla; if Self-inductance L23 of the coil 5; Self-inductance Ma of the second coil 6; First coil 5 and second coil Mutual inductance with Equation (1) above ±2 M a
The sign of is negative when the magnetic fluxes of the first coil 5 and the second coil 6 are added to each other (additive), and is positive when they cancel each other (-differential). Whether the mutual inductance M is additive or differential is determined by the winding direction of the first coil 5 and the second coil 6. Since the inductance La of the reactor can be made smaller in the differential type, the following explanation will be given assuming that the winding directions of the first coil 5 and the second coil 6 are in a differential relationship.

Mutual inductance Ma is expressed by equation (2).

Ma = k3 Lla e L21-
- Kaiken - (2) Here, ka is the coupling coefficient of magnetic flux, and when there is no leakage magnetic flux, k=1. In reality, 0
<ka<1. When the magnetic fluid 11 is not present in the first container 8, the leakage magnetic flux is extremely small and is 1 in k.

Therefore, L a *O. Next, consider the case where the first container 8 is filled with the magnetic fluid 11. The inductance Lb between the terminals IA and 1B is expressed by equation (3).

I, b; Inductance Llb of the glue handle when the first container 8 is filled with magnetic fluid; Self-inductance L2b of the first coil 5; Self-inductance Mb of the second coil 6; First coil 5 and second coil The inductance mutual inductance Mb with 6 is expressed by equation (4).

Mb-kbV image bottom -1 几 -----(41)
kb is a coupling coefficient of magnetic flux, which is kb-0 when all of the magnetic flux is leakage flux. In reality, it is 0<kb<1.

When the first container 8 is filled with the magnetic fluid 11, the leakage magnetic flux increases and k approaches zero. Therefore, when the first container 8 is filled with magnetic fluid, the inductance b of the accelerator body 2 has a constant value. That is, when changing the amount of magnetic fluid 110 in the first container 8 from zero to full, the inductance Lb of the reactor body 2
It can be seen that changes from zero to b.

By the way, the temperature of the magnetic fluid 11 with fluidity is 25°C.
There are some with a viscosity of about 3 Q cps. (For example, Tohoku Metal Co., Ltd., 7 Jericho, Lloyd HC-50
). Since the viscosity of 30 cps is approximately equal to the viscosity of lubricating oil, a method of pumping liquid magnetic fluid 11 as shown in FIG. 2 is possible. That is, high-pressure gas 12, for example, N2 gas, is added to the first container 8 and the second container 9 to a pressure of t# to balance the pressure, thereby balancing the liquid level of the magnetic fluid 11. Therefore, the first
When the pulp 13B of the container 8 is opened to lower the gas pressure, the magnetic fluid 11 in the first container 8 increases and the inductance of the reactor increases. Conversely, the pulp 1 of the second answering device 9
When 3A is opened to lower the gas pressure, the magnetic fluid 11 in the first container 8 decreases, and the inductance of the reactor decreases. The gonglesser 14 has a first container 8 and a second container 9.
It is used for the purpose of keeping the interior filled with high pressure gas 12 at all times.

In addition to the means for transferring the magnetic fluid 11 by controlling the high-pressure gases 12A and 12B, for example, a coil is wound around 100 circumferences of a pipe made of a non-magnetic material, and a DC voltage is applied to the coil. It is also possible to control the flow direction of the magnetic fluid 11 by switching the polarity. -Although this device has been explained assuming a variable reactor for electric power, it is not limited to this example.
It is clear that it can be applied to electronic variable reactors that control the leakage magnetic flux by controlling leakage magnetic flux, and can also be applied to phase adjustment reactors,
Can you name resonance reactors, power flow control reactors, fault current suppression devices, etc.? In addition, the above-mentioned fault current suppression device sets the inductance to zero during steady state, and when a huge fault current is about to flow, the magnetic fluid 11
By rapidly transferring the current, the inductance increases rapidly and the fault current is suppressed.

The present invention is not limited to the above embodiments, but the first coil 5
If the second coil 6 and the second coil 6 are made independent and used as the primary and secondary windings of a transformer, it can also be used as a leakage transformer used in a welding machine or the like.

As described above, according to the present invention, a non-magnetic container containing a magnetic fluid is inserted into a part of the annular core, and the inductance is continuously changed from zero by adjusting the amount of the magnetic fluid. Therefore, there is no need for a tap changer, there are no consumable parts such as contactors, there is no effect of the current flowing when changing taps, there is no surge, etc., and the transient stability when changing the inductance is greatly improved. In addition, it has extremely excellent effects as a variable reactor, such as being able to be used as a fault current suppression device or a leakage transformer.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing the principle of a conventional variable reactor, and FIG. 2 is a configuration diagram of a variable reactor according to an embodiment of the present invention. IA, IB...terminal, 5...first coil, 6...
Second coil, T... Annular core, 8... First container, 1
1...Magnetic fluid. Agent Shin Kuzuno - (1 other person) Figure 1 Chiku 2 Figure A Mr. Commissioner of the Japan Patent Office 1. Indication of the case: Japanese Patent Application No. 58-55599 2, title of the invention: Variable reactor 3, section 5 to Kata Yuhito, representative of the person making the amendment, column 6 for detailed explanation of the invention in the specification subject to the amendment, contents of the amendment ( 1) Delete the statement "Inductance variable" from the second to third lines of page 3 of the specification. (2) In pages 6, lines 15 to 16 of the specification, "inductance LbJ" is corrected to "inductance."that's all

Claims (2)

[Claims] (1) An annular core having a magnetic leakage portion in a part to form a closed magnetic path, a coil wound around the annular core so that the inductance can be changed, and a main force applied to a part of the annular core. a magnetic fluid containing a variable amount of fluid in the non-magnetic container such that the inductance can be changed; and an amount of the magnetic fluid contained in the non-magnetic container. A variable reactor equipped with a magnetic fluid transfer means such as a compressor that can control the (2) A coil is wound around the circumference of the piping through which the magnetic fluid passes through the magnetic fluid transfer means, and a direct current voltage is applied to the coil to switch the direction of the direct current voltage, thereby directing the flow of the magnetic fluid. The variable reactor according to claim 1, characterized in that the variable reactor is configured to control.