RU2685221C1 - Shunting reactor with mixed excitation (versions) - Google Patents

Abstract

FIELD: electrical engineering.SUBSTANCE: invention relates to electrical engineering and is used in electrical systems. In series with triples of power windings (1 and 2), additional magnetising coils (7, 8) connected to open triangles are connected. Rectifier (5) controls current of independent excitation windings (3, 4). Windings (7, 8) intensify effect of windings (3, 4).EFFECT: disclosed shunting reactor with mixed excitation.2 cl, 2 dwg

Description

The proposal relates to electrical engineering and is used in electrical systems.

The well-known and used scheme / 1 /, shunt reactor (hereinafter referred to as CSR), contains power inputs, bias windings connected to a thyristor rectifier. The disadvantage of such a device is complexity.

The prototype of the proposal for the first version is a CSR-magnetic amplifier / 2 / containing in each phase the first and second network windings connected by one output and the odd and odd windings connected to the inverse leads of the diodes, and the ground windings connected to the rectifier and grounding . The disadvantage of such a device is a relatively complex circuit; a large number of diodes (12) is required, since in this case three more diodes must be included in the gap of each phase in order to form a diode bridge whose rectified diagonal should include a phase bias winding.

By the second variant, the prototype is CSR / 3 /, containing in each phase the first and second network windings, connected together by one terminal and even windings and odd windings being connected by the second terminals into two common points that are grounded. This CSR has, like the previous common drawback, a low current gain, which requires an increase in the bias winding.

The technical problem solved by this invention is to simplify, increase speed and reduce weight and size.

The task is solved in the first version due to the fact that CSR is equipped with a second set of windings connected in series in two open triangles, one point of these triangles is connected to the poles of the diode bridge, and the others are connected to ground.

The task is solved in the second version due to the fact that CSR is equipped with a second set of windings connected in series in two open triangles, one point of these triangles is connected to ground, and the others are connected to the zero points of the stars.

FIG. 1, 2 shows the scheme of CSR. Two groups of three-phase power windings 1 and 2 are connected together by one output and are intended for connection to the network. The windings 3, 4 independent field windings are connected to controlled rectifier 5, powered by transformer 6. There are additional series bias windings 7 and 8, which are included in open triangles and connected to ground 9. In FIG. 1, the power windings 1 and 2 of the same phase by the second terminals are connected together and connected to a diode bridge 10, the poles of which are connected to the second output of triangles 7.8 additional windings. And in FIG. 2 windings 1 and 2 are connected by second leads into star circuits, the common point of which is connected to the second lead of triangles 7, 8 additional windings.

CSR works as follows. It is a continuously adjustable three-phase inductance and is connected to high-voltage power lines and networks. In fact, it replaces the synchronous compensator. Changing the constant excitation current (magnetization) supplied by the rectifier 5 to the windings 3, 4, in a known way, change the inductance of the CSR, and hence the reactive power consumed by the windings 1 and 2 of the CSR from the network.

The regulation of this current is provided not only by the magnetomotive direct current (ppm) in the windings 3,4, but also by the ppm windings 7 and 8 respectively. That is, there is both independent magnetization by windings 3 and 4, and sequential magnetization by windings 7 and 8 by the operating current, which allows us to call the device with mixed excitation. Due to the placement of the windings 7 and 8 on the same terminals as the windings 1 and 2, the gain of the CSR increases. This reduces the power of the rectifier 5. The inductance of the excitation windings 3 and 4 also decreases (since they are performed with a smaller number of turns), which leads to an increase in speed. However, the introduction of positive current feedback increases the no-load current of CSR. In the diagram of FIG. 1 for bridge 10, a small number of diodes is used, which simplifies the device and reduces losses. Relatively low voltage diodes are used.

Information sources:

1. The patent for the invention of the Russian Federation №2451353, C.H01F 29/14, 27/26, 10.21.2010.

2. USSR author's certificate No. 886204, cl. H03R 9/00, 03/24/1980.

3. Patent for useful model of the Russian Federation No. 136919, cl. НРР 29/14, Н02Р 13/00, 07.17.2013.

Claims (2)

1. Shunt reactor with mixed excitation, containing in each phase the network winding, one output, designed to connect to the network, control windings connected to a controlled rectifier and grounding, characterized in that it is equipped with a second set of windings connected in series in two open triangles, one point of these triangles is connected to the poles of the diode bridge, while the others are connected to ground. 2. Shunt reactor with mixed excitation, containing in each phase the first and second network windings, some of the conclusions connected together to connect to the network, and the second conclusions of the even and odd windings of different phases are connected to the stars, the control windings connected to the controlled rectifier and grounding, characterized in that it is provided with a second set of windings connected in series in two open triangles, one point of these triangles is connected to ground, and the others are connected to zero points of stars.

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