A transformer over-current blocking on-load voltage regulation automatic switching method and device

Abstract

The invention discloses an automatic overcurrent-blocking and on-load voltage regulation switching method and an automatic overcurrent-blocking and on-load voltage regulation switching device of a transformer. The method comprises the following steps: step 1: mounting a signal acquisition and transmission module and acquiring a switching position signal; processing the signal by utilizing a central processing system and transmitting the processed signal to a processing terminal; step 2: receiving the switching position signal sent by the step 1 by the processing terminal and transmitting the switching position signal to a central processing system; judging that a No.1 main transformer and a No.2 main transformer are in a parallel operation state or an independent operation state by the central processing system according to high-voltage switching position signals and sectional switching position signals of the No.1 main transformer and the No.2 main transformer; step 3: based on a selection module, selecting the judging result of the step 2; and step 4: outputting a relay branch circuit selected by the step 3 to an overcurrent-blocking and on-load voltage regulation circuit through an output module. The technical effects that the overcurrent-blocking and on-load voltage regulation of the transformer can be automatically switched, the efficiency is relatively high, the automatic digital control precision is relatively high and the safety is relatively high are realized.

Description

technical field [0001] The invention relates to the field of transformer automatic control, in particular to a transformer overcurrent blocking on-load voltage regulation automatic switching method and device. Background technique [0002] According to DL / T574-2010 "Guidelines for Operation and Maintenance of Transformer Tap-Changer" "5.2.1.3 The control circuit of the motor mechanism of the on-load switch should be equipped with a transformer over-current blocking device, and its setting value is 1.2 times the rated current of the transformer.", "6.4.5.6 When two on-load tap-changing transformers are running in parallel, it is allowed to perform tap change operation under the condition of 85% of the rated load current of the transformer and below." At present, the on-load tap-changing transformers are all equipped with pointer-type Over-current blocking on-load voltage regulating device. When the transformer is running independently, the operator can set the over-current se...

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Problems solved by technology

[0005] The invention provides a transformer over-current blocking on-load voltage regulation automatic switching method and device, which solves the problems of low efficiency, poor accuracy and potential safety hazards in the existing transformer over-current blocking on-load voltage regulation switching mode problem, realized the technical effect of being able to automatically switch over-current blocking on-load voltage regulation of the transformer, with high efficiency, high precision of automatic digital control, and high safety

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