RU22580U1 - MAGNET SHUNT - Google Patents

Description

Magnetic shunt.

The utility model relates to the field of electrical engineering, in particular to electric reactors, and in particular to magnetic shunts and can be used for shunting; their reactors with continuously variable reactive power.

Known magnetic shunt of an electric reactor, made in the form of a parallelepiped, laden from plates of electrical steel, while the length of the shunt is wider than the yoke, and the remaining dimensions require calculation and are associated with a coefficient depending on the ratio of the sizes of the magnetic circuit, windings and other parameters (patent of the Russian Federation No. 2063084, IPC: H01 F 37/00, 1996).

The disadvantage of this device is its multi-parameter dependence on the size of the magnetic circuit, the fill factors of the cross section with steel, on the selected induction in the reactor rod and in shunts, as well as the remaining magnetic field scattering regions.

Known magnetic ntyHT electric reactor, made in the interior of the split ring. (USSR author's certificate No. 1809470, class H01 F 29/14, 1993. prototype). The ring is made of steel tape having a radial cut. The disadvantage of the prototype is the increased metal consumption due to the increased window height of the magnetic circuit due to the presence of high rings, as well as increased additional losses due to the inevitable relatively large technological gap

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between the ring and the yoke of the reactor, as well as the complexity of the design of twisted rings.

The technical result of the utility model is the elimination of non-heating of the extreme turns of the windings of the electric reactor, the simplicity of the calculations of the magnetic system, the shunt and the transformer (reactor), increasing the service life of the insulation of transformers and electrical steel.

The technical result is achieved in that the magnetic shunt of the electric reactor, made in the form of a split ring, is made of sectors drawn in the form of packets of parallel plates of electrical steel. The cross section of the ring can be made stepwise.

The essence of the utility model is illustrated in FIG. 1, 2, 3, 4,5.

In FIG. 1 is a schematic cross-sectional view of an electric reactor, where 1 is a magnetic shunt, 2 is a schematic representation of the yoke of an electric reactor, 3 is a schematic illustration of the main rod of an electric reactor, 4 is a schematic view of the space filled with the windings of an electric reactor.

In FIG. 2 shows a diagram of the closure of the scattering flux in ring shunts, where 1 is a magnetic shunt, 2 is a schematic representation of the yoke of an electric reactor, the arrows show the direction of closure of the scattering fluxes.

In FIG. 3 shows a fragment of the location of the shunt on the reactor during planar shunt execution, where 1 is a magnetic shunt, 2 is a schematic diagram of the yoke of an electric reactor, 3 is a schematic diagram of the main rod of an electric reactor, 4 is a schematic diagram of the space filled

windings of an electric reactor, 5 - insulation of an electric reactor.

In FIG. 4 shows a fragment of the location of the shunt on the electric reactor with a step-by-step execution of the shunt, where 1 is a magnetic Ш5ШТ, 2 is a schematic diagram of the yoke of an electric reactor, 3 is a schematic diagram of the main core of an electric reactor, 4 is a schematic diagram of the space filled by the windings of an electric reactor, 5 is isolation of an electric the reactor.

On the . 5 is a schematic cross-sectional view of an electric reactor for illustrating a plate-sector use of a magnetic shunt, where 1 is a magnetic shunt, 2 is a schematic representation of a yoke, 3 is a schematic illustration of a main rod, 4 is a schematic illustration of an arrangement of windings of an electric reactor.

When the transformer is operating under load, a flow occurs outside the main rod 3 of the magnetic core of the electric reactor, called the scattering flux, in the area occupied by the windings 4 of the electric reactor (Figs. 1, 3, 4, 5).

With the great mobility of electric reactors (transformers), this flow reaches Weber fractions (O, Wb). Such a flow, being uncontrollable, permeates the structural elements of the reactor (beams with a jug, 1 neck and walls of the tank, wires of the windings) and causes their significant overheating and, accordingly, additional losses. As a result of such overheating, the accelerated aging of the insulation of 5 electric reactors and the destruction of electric steel occurs.

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covering the windings of the reactor from below and from above (in particular, as shown in Fig. 3.4).

The disadvantages of such shunts are the complexity of their manufacture, including bending according to coolness and a radial section to prevent short circuit of the flow along the shunt spiral, the need to increase the height of the magnetic circuit to the height of two shunts.

Taking into account that the scattering flux is closed along ring shunts in four different directions (Fig. 2), it is advisable to divide the shunts into four (Fig. 4) identical parts (four sectors) adjacent to the yoke from two sides (the adjoining of the shunts is shown in Fig. 2). 3, 4) using the commonly used form of yoke 2 (Fig. 3, 4,5) with decreasing width as it approaches the windings of the electric reactor. In this clause 1, it is not necessary to increase the height of the magnetic circuit; the consumption of electrical steel for the manufacture of magnetic shunts 1 is reduced.

All sectors of each shunt 1 are packages of parallel sheets of electrical steel, the manufacture of which is much simpler than ring twisted twigs.

This magnetic shunt can be called sectorial. Sector magnetic shunts provide practical parallelism of magnetic lines along the entire height of the reactor windings and even in the space between the windings and shunts, which eliminates overheating of the extreme turns of the windings and simplifies calculations of the entire magnetic system of the reactor.

Since all sectors are identical, their manufacturing is technological, because you can create a production line of everything.

one sector. Such single sectors can be supplied as duplicate elements (spare parts).

Magnetic shunts cover the entire surface of the end parts of the windings 4 of the electric reactor (Fig. 5). The thickness (height) of the shunts is determined by the collected value of the scattering flux (approximately 1/8 of the total scattering flux) and for high-power reactors is up to 10 12 cm.

Claims (2)

1. The magnetic shunt of an electric reactor, made in the form of a split ring. characterized in that the ring is made of sectors drawn in the form of packets of parallel plates of electrical steel. 2. The magnetic shunt of the electric reactor according to claim 1, characterized in that the cross section of the ring is made stepwise.