SU1394249A1 - Power smoothing reactor of gate converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in valve converters for a high-power DC and AC electric drive, as well as in high-power static converters for various branches of the national economy. The purpose of the invention is to increase the reliability of high-power valve converters. The device contains a short-circuit magnetic circuit 1 with gaps 2, on two rods of which there is a winding of two galvanically not connected branches 3 and 4, the state. - 5, 6 and 7, 8 parallel-connected coils 9 in branch 3 and 10 in branch 4 having the same winding direction on each rod of the magnetic circuit 1, Coils 9 and 10 of branches 3 and 4, respectively, connected in series on the rods; evenly distributed on both rods of the magnetic circuit and alternate with each other, and the beginners of the 11 branches 3 and 4 are formed by the beginnings of groups of coils 5 and 7 located on one rod and connected in series with groups 6 and 8 located on the other core of the magnetic circuit, the ends of which are to image There are conclusions of the ends of 12 branches 3 and 4. 2 Il. i cl

Description

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11394249

The invention relates to electrical engineering and can be used in valve converters for high-power electric drives of direct and alternating current, as well as in static converters of high power in various industries.

The purpose of the invention is to increase the reliability of a powerful valve converter containing smoothing reactors by reducing the emergency current of the valves.

Fig. 1 is a diagram of the connection of the coils of the winding branches of the smoothing reactor; Fig. 2 is a diagram of a high-power valve converter element with winding branches of a smoothing reactor connected to two thyristor bridges.

The smoothing reactor contains a closed magnetic circuit J with gaps 2, on two rods of which there is a winding of two galvanically not connected branches 3 and 4, consisting of sequentially connected on rods groups 5,6 and 7,8 parallel connected coils 9 in branch 3 and. JOB coils of branch A, having the same winding direction on each rod of magnetic conductor J. Coils 9 and -10 branches 3 and 4 are evenly distributed on both rods of the magnetic circuit and alternate between each other, and conclusions A .and A of the beginnings of JJ branches 3 and 4 are formed by the beginnings of groups of coils 5 and 7 located on the same rod and connected in series with groups 6 and 8 located on the other core of the magnetic circuit, the ends of which form the steps X and Chl, the ends 12 of branches 3 and 4.

In the converter, containing parallel operating bridges 13 and 14, powered from one winding of the J5 transformer, the beginnings J1 of branches 3 and 4 of the smoothing reactor windings are connected to the bridges, and their ends 12 are connected to the load

In the nominal mode of conversion, the pva-: bodies along the branch m 3 and 4 windings flow - equal unidirectional currents (on

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When a valve is broken, for example, 16 in bridge J3, a short-circuit is formed, which also includes valve J 7 of this bridge. An emf of the two phases of the transformer winding is applied to the branches of the reactor 3 and 4, causing the flow of reverse current through branch 3 (the current in the short-circuit mode is shown by solid lines). Different current directions of the same amplitude in coils 9 and JO of branches 3 and 4 located on the same cores of the magnetic core and having the same winding direction on the same rod, leads to compensation of the magnetic flux of the reactor and, accordingly, a sharp decrease in inductance between terminals and A. At that, a significant part of the emergency current flows through the gate J8 of the bridge 14, loading the gate 17 of the damaged bridge 3, which increases the reliability of the converter.

When using the known solutions, no change in inductance occurs in the reactor branch connected to the untransformed bridge, and the entire short circuit current flows through the valves of the damaged bridge.

The positive effect of the implementation of the invention is the enclosed-ps in increasing the reliability of powerful valve converters.

In addition, in the case when the number of gates in the bridges of a high-power converter is determined by the magnitude of the emergency current during internal short shut-offs (breakdown or overlap. -Plen), an economic effect can be obtained by reducing the number of gates connected in parallel.

Claims (1)

Invention Formula A smoothing reactor of a powerful valve converter containing a closed magnetic core, the rods of which are filled with gaps, a winding placed on the rods and made of two galvanically unrelated branches, each of which consists of figure 2 is shown by the dotted line). In this case, 55 DIVIDED groups in parallel among the winding branch have the same specified inductance necessary for smoothing the pulsations and dividing the load current between the bridges. coils with the same direction of winding, each rod is not, protruding, so that, in order to increase the reliability 0 five 0 five 0 five 0 five 0 When a valve is broken, for example, 16 in bridge J3, a short circuit is formed, which also includes valve J 7 of this bridge. An emf of the two phases of the transformer winding is applied to the branches of the reactor 3 and 4, causing the flow of reverse current through branch 3 (the current in the short-circuit mode is shown by solid lines). Different current directions of the same amplitude in coils 9 and JO of branches 3 and 4 located on the same cores of the magnetic circuit and having the same direction of winding on one rod. This leads to compensation of the magnetic flux of the reactor and, accordingly, a sharp decrease in inductance between the terminals A and A In this case, a significant part of the emergency current flows through the valve J8 of the bridge 14, unloading the valve 17 of the damaged bridge 3, which increases the reliability of the converter. When using the known solutions, no change in inductance occurs in the reactor branch connected to the untransformed bridge, and the entire short circuit current flows through the valves of the damaged bridge. The positive effect from the implementation of the invention is the enclosed-ps in increasing the reliability of powerful valve converters. In addition, in the case when the number of gates in the bridges of a high-power converter is determined by the magnitude of the emergency current during internal short-circuits (breakdown or overlap. -Cap), an economic effect can be obtained by reducing the number of gates connected in parallel. Claims; A smoothing reactor of a powerful valve converter containing a closed magnetic core, the rods of which are filled with gaps, a winding placed on the rods and made of two galvanically unrelated branches, each of which consists of There are no random groups of parallel coils having the same direction of winding on each rod, so that, in order to increase the reliability the converter by reducing the emergency valve current, the number of coils of each winding branch on both their cores of the magnetic circuit is the same, with the coils of different branches alternating with each other, the terminals of the branches formed by the beginnings of successively connected groups of coils are placed on one rod, the terminals ends of branches, formed by ends of series-connected groups of coils. . Editor A. Kozoriz Compiler B, Kvasnikov Tehred M. Khodanich Proofreader Oh, Kravtsova Order 2223/47 Circulation 746 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 f Subscription