SU1339534A1 - Device for supplying electric process installations - Google Patents

Abstract

The invention relates to electrical engineering and m. used in those sectors of the national household that require the conversion of an AC to a stabilized post and high demands on energy performance, in particular in the power sources of high-power electrolysis units and cores. The purpose of the invention is the increase: power factor devices and reducing the consumption of capacitors of a parametric current source. For this, a device containing a parametric current source 1, the transformer 2 of which is connected by a valve winding 4 to the termination unit 5, is equipped with an artificial switching unit 8 with a frequency of the operating voltage of the capacitor corresponding to the harmonics of the current of the transformer winding 4 6k11, where to 1,3,5, ..., while the valve winding 4 is split into an even number of parts, half of which are connected into a star, and the other into a triangle. 3 il. i (L SAO 00 with SD 00 AI.

Description

Shaving is related to electrical engineering and can be used in national households, de converting alternating current into a stabilizing constant is required and high demands are placed on energy performance, in particular in high-power electrolysis units.

 and etc.

The purpose of the invention is to increase the power factor of the device and reduce the consumption of capacitors of a parametric current source.

Figure 1 shows the block diagram of the proposed device; FIG. 2 is a diagram with an artificial switching node connected to the transformer mains winding; FIG. 3 is a diagram with an artificial switching node formed by the additional winding of the transformer.

The device contains a parametric DC source 1, comprising a three-phase transformer 2 with mains 3 and valve A windings, the last of which is connected to the rectifying units 5, reactive reactor elements b and capacitors 7, which together with the phases

The network winding 3 is connected in a parametric scheme and connected to the mains. Device extra

equipped with an artificial switching unit 8, which is connected to the transformer. The valve winding 4 of the transformer 2 is split into two parts, one of which is connected into a star, and the other into a triangle. The devices shown in FIGS. 2 and 3 have a transformer 2, executed on two magnetic cores, while the valve winding 4 placed on one magnetic core is connected in a star, on the other in a triangle. The artificial valve switching node 8 in one case (Fig. 2) is a three-phase reactor, shunted by capacitors and connected to parallel-connected parts of the power winding, in the other (Fig. 3) the node is formed by an additional winding of the transformer and capacitors.

The embodiments of the device can be much more. They may differ according to the method of connecting the node - artificial switching (to the power winding, to the valve winding, to the additional winding

transformer, as fig.Z, etc.),

constructive implementation of the transformer, method of obtaining - the shift of the linear voltage of the parts of the valve winding, etc.

The network windings 3 of the transformer 2, which is made of two magnetic cores, are connected in parallel through an equalization reactor, shunted by a capacitor bank. In network

the windings 3 are transformed by the currents of the valve windings 4. Moreover, the harmonic amplitudes of the current of the winding bridge of the rectifier connected to a star are equal to the amplitudes of the harmonics of the same name of the winding of the winding connected in triangle and harmonics with numbers 6k t1, where k 0,2,4 ,. . . are in phase and harmonics with numbers 6k t1, where k

1,3,5, ..., - in antiphase. Since the currents of the mains and valve windings are proportional, the harmonics that are in phase flow through the windings of the reactor, ensuring the balance of the two turns of its two windings, and the harmonics that are in the antiphase is closed through a capacitor bank. In this case, the voltage of the harmonic current of the capacitor with the norms

6k ± 1, where k 1,3, ..., is transformed into a valve winding 4, being added to the voltage of the main frequency and providing ahead of the rectifier valves for kig. By selecting the parameters of the artificial switching node, it is possible to ensure the shear power of the main harmonic of the converter current close to unity. The second subcircuit device consists of reactive elements, reactors, and capacitors connected in a star with a network circuit: the windings 3 of the transformer. With equal resistances of reactive elements, this

The subschema provides current stabilization in the transformer mains windings and, accordingly, direct current.

Thus, the device provides a high power factor close to one (0.99 + l) while stabilizing the load current, thus increasing the efficiency of the source.

3G3395

and reducing the consumption of capacitors makes it possible to perform it at high power. This reduces the maximum voltage of the parametric source capacitors.

current, and hence their power.

Claims (1)

Invention Formula A device for powering electrical installations, comprising a parametric DC source, including a three-phase transformer with mains and valve windings, reactive reactor elements and capacitors with equal resistance at the mains supply frequency, and rectifier blocks, with the transformer’s main winding phases and reactive the elements are connected in a three-phase parametric scheme and connected to the supply network, and the valve winding of the transformer is connected to rectification units, characterized in that, in order to increase the power factor and reduce the consumption of capacitors, it is additionally equipped with a valve switching center with an operating frequency the voltage of the capacitors corresponding to the harmonics of the current of the transformer's valve winding is 6k ± 1, where k 1,3,5, ..., while the transformer's winding is split into an even number of parts, half of which is connected in a star, and the other half - in a triangle. FIG. 2 Editor I.Gorn Compiled by L.Krasnov Tehred M.Hodanich Order 4221/38 Circulation 863 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 Phi Proofreader N.Korol