RU2548171C2 - Device providing electromagnetic compatibility of electric equipment operation with adjustable magnetic flux - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: device providing electromagnetic compatibility of electric equipment operation with adjustable magnetic flux contains the E-shaped core with winded induction, boosting and control coils. Excitation windings W₁₁ and W₁₂ have identical number of turns and are series opposition connected. Boosting coils W₂₁ and W₂₂ are connected in series with a loading by such polarity that one of them operates for voltage rise and another one - for voltage dip on a load. Control windings W₃₁ and W₃₂ are connected through thyristor pairs in such a way that W₃₁ + W₃₂ = W₃ = const.

EFFECT: expansion of range of adjustment.

1 dwg

Description

The invention relates to electric power equipment and can be used for individual voltage regulation at remote sites and for responsible consumers, mainly in the mining industry. Mining enterprises are characterized by voltage fluctuations at remote consumers over a wide range, which is due to voltage changes at the main step-down substations, interchangeable operation of enterprises and cyclic mining loads.

A device for the stabilization of AC voltage (copyright certificate No. 440654, class G05f 1/20), containing n voltage boost transformers, the primary windings of which are shunted by switches. The number of turns of the secondary windings relate to each other, like numbers in binary code. Several transformers can be switched on simultaneously.

The disadvantage of this device is the need to use n separate transformers, which increases the size and weight of the device.

A device for switching booster transformers of a discrete m-phase transistor thyristor AC voltage regulator (copyright certificate No. 696582, class G05F 1/14). A method for switching thyristor switches in the secondary windings of boost transformers involves the removal of pulses from an included group of thyristors to eliminate the short circuit of power transformers. The device contains a separate group of power transformers and a separate group of boost transformers.

The disadvantage of this device is the complexity of the design and control algorithm of the circuit.

A device is known that contains a multi-winding booster transformer with a W-shaped core, on the side rods of the transformer there are two network, two booster (booster and volt residues) and two control windings, control windings connected in series (“Electric Machines and Power Systems”, No. 16, with 225-238, 1989). Five pairs of taps from the control winding are shunted with five keys from on-parallel connected thyristors. Voltage regulation is carried out by switching on only one of the five keys, and both thyristor switches are turned on with a zero control angle and conduct current for a full voltage period. The boost windings and control windings are turned on in such a way that the sequential and alternating switching on of the thyristor switches leads to regulation of the output voltage from minimum (lower than rated) to maximum (higher than rated).

The disadvantage of this device is the design complexity and low reliability.

A device for discrete control of alternating voltage (certificate for utility model No. 6478), adopted for the prototype, which contains a W-shaped core with coils of excitation, voltage boost and control. Field windings W ₁₁ and W ₁₂ have the same number of turns and are turned on in series. The voltage boost coils W ₂₁ and W _{22 are} connected in series with the load with such polarity that one of them works to increase and the other to lower the voltage at the load. The control windings W ₃₁ and W _{32 are} connected through thyristor pairs in such a way that W ₃₁ + W ₃₂ = W ₃ = const.

The main disadvantage of this device is the small voltage regulation range.

The technical result of the invention is to expand the range of voltage regulation of the boost transformer.

The technical result is achieved by the fact that the converter blocks made in the form of coils with coils wound around them change the voltage control range at remote sites and for responsible consumers while changing the number of turns of voltage boost and voltage calculation with a constant total number of them.

The device comprises a W-shaped core with excitation, voltage boost and control coils wound around it. Field windings W ₁₁ and W ₁₂ have the same number of turns and are turned on in series. The voltage boost coils W ₂₁ and W _{22 are} connected in series with the load with such polarity that one of them works to increase and the other to lower the voltage at the load. The control windings W ₃₁ and W _{32 are} connected through thyristor pairs in such a way that W ₃₁ + W ₃₂ = W ₃ = const. With an increase in W ₂₁ and a simultaneous decrease in W ₂₂ , but with W ₂₂ + W ₂₁ = const, the interval at which voltage addition occurs is reduced, and the interval at which the increase in voltage decrease occurs. With a decrease in W ₂₁ and a simultaneous increase in W ₂₂ , but with W ₂₂ + W ₂₁ = const, the interval at which the voltotag is increased increases, and the interval at which the increase in voltage is increased is reduced. With a decrease in the total number of turns in the winding of the voltage boost, the voltage regulation range at the output of the VDT decreases.

The proposed device is illustrated by the drawing shown in FIG. 1, which shows a diagram of a device that provides electromagnetic compatibility of electrical equipment with adjustable magnetic flux, W ₁₁ and W ₁₂ - field windings, have the same number of turns and are turned on in series; W ₂₁ and W ₂₂ are boost coils, connected in series with a load of such polarity that one of them works to increase, and the other to lower the voltage across the load; W ₃₁ and W ₃₂ - control windings - are connected through thyristor pairs in such a way that W ₃₁ + W ₃₂ = W ₃ = const.

Claims (1)

A device that provides electromagnetic compatibility of the operation of electrical equipment with adjustable magnetic flux, containing two converter units providing voltage boost and voltage isolation, which are connected in series to a three-phase load, characterized in that the converter blocks, made in the form of coils with coils wound on them, change the voltage control range at remote sites and at responsible consumers while changing the number of turns of voltage boost and volts deductions with the constancy of their total number.