On-load capacity-regulation distributing transformer

Abstract

The invention discloses an on-load capacity-regulation distributing transformer, comprising a transformer body, a detection unit, a control unit and a capacity regulation device, wherein the detection unit is connected with the transformer body, a signal output end of the detection unit is connected with a signal input end of the control unit, a signal output end of the control unit is connected with a signal control end of the capacity regulation device, and a signal output end of the capacity regulation device is respectively connected with a high-voltage coil and a low-voltage coil of the transformer body; the capacity regulation device comprises a contactor and a combination switch, wherein the combination switch has 5KW or below 5KW voltage class and is connected in parallel to an electronic switch of a thyristor; and the control unit can be used for eliminating overcurrent on a high-voltage side and overvoltage on a low-voltage side by selecting a control strategy of nonsynchronous actions on the high-voltage side and the low-voltage side. The invention solves the problems on the voltage class, cost, volume and reliability of the on-load capacity-regulation combination switch of the distributing transformer, and provides the on-load capacity-regulation transformer with the advantages of high automation degree, low cost and easiness in implementation, so as to realize the reliable and economic capacity-regulation operation of the distributing transformer.

Description

technical field [0001] The invention relates to the field of power distribution in electric power systems, in particular to an on-load capacity regulating power distribution transformer. Background technique [0002] The traditional on-load capacity regulating transformer uses a mechanical switch and its electric mechanism as a composite switch for capacity regulation. When the composite switch is switched with load, a large arc is generated, which is easy to ablate the contacts and cause oil pollution, which affects the insulation characteristics and use of the transformer. The service life is long, the maintenance workload is large, and the cost is also high. [0003] The existing on-load capacity-regulating transformer with a composite switch as a capacity-regulating switch solves the fast and arc-free capacity regulation of distribution transformers, such as the Chinese patent authorization announcement number CN201170985Y "a composite switch for on-load capacity-regulat...

AI Technical Summary

Problems solved by technology

[0002] The traditional on-load capacity regulating transformer uses a mechanical switch and its electric mechanism as a composite switch for capacity regulation. When the composite switch is switched with load, a large arc is generated, which is easy to ablate the contacts and cause oil pollution, which affects the insulation characteristics and use of the transformer. Life expectancy, heavy maintenance workload, and high cost

[0003] The existing on-load capacity-regulating transformer with a composite switch as a capacity-regulating switch solves the fast and arc-free capacity regulation of distribution transformers, such as the Chinese patent authorization announcement number CN201170985Y "a composite switch for on-load capacity-regulating distribution transformers" It is recorded in "and its distribution transformer", in which, because there is no structure and control scheme to reduce or suppress the steady-state high voltage and transient overvoltage and overcurrent of the high-voltage composite switch, the electronic switch needs to use many thyristors in series to realize the switch 10KV Withstand voltage, the reliability of the product is significantly reduced, and the cost is increased; the mechanical switch in the high-voltage composite switch needs to use a 12KV high-voltage vacuum switch, which significantly increases the cost, and even the price of the composite switch is higher than the price of the transformer body

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