Group-switchable transformer for box-type substation vehicle and usage method thereof

Abstract

The invention discloses a group-switchable transformer for a box-type substation vehicle and a usage method thereof. The group-switchable transformer comprises a high-voltage winding and a low-voltage winding and also comprises a high-voltage change-over switch, wherein the high-voltage change-over switch includes gears 1 and 2, the high-voltage winding consists of an A-phase winding, a B-phase winding and a C-phase winding, the A-phase winding consists of a winding section I, a winding section II and a winding section III, the B-phase winding consists of a winding section IV, a winding section V and a winding section VI, the C-phase winding consists of a winding section VII, a winding section VIII and a winding section IX, and the winding sections are connected through the gear 1 or 2 of the high-voltage change-over switch. Two groups Dyn11 and Yyn0 of the same transformer can be switched, meanwhile invariant output of a low-voltage output end can be ensured after switching, the transformer has the functions of phase detection and parallel protection after switching, and accordingly the paralleling failure or safety problem caused by parametric variation or phase difference after group switching of the transformer is avoided.

Description

technical field [0001] The invention relates to a transformer and its use method, in particular to a switchable group transformer for box-to-vehicle conversion and its use method. Background technique [0002] With the continuous improvement of people's living standards, the load of residents' electricity consumption is increasing, and people's requirements for the reliability of power supply are getting higher and higher, and power outages are basically not allowed for domestic electricity consumption. Urban distribution network transformers are the key equipment for distribution network operation. , the reliability of its operation directly affects the reliability of the power supply of the distribution network, and in order to ensure the continuous and stable operation of the distribution network transformer, the staff need to regularly repair, replace or increase the capacity of the distribution network transformer, but these tasks require the transformer to be short-term...

AI Technical Summary

Problems solved by technology

[0004] Due to the limited space in the mobile box car, only one fixed group of transformers can be installed, but the currently used distribution network transformer groups are mainly Dyn11 and Yyn0, and the mobile box car is used for non-stop maintenance or replacement of distribution network transformers. At the same time, in order to ensure that the user will not be powered off during maintenance or replacement of the distribution network transformer, it is necessary to run the transformer in the mobile box transformer and the distribution network transformer in parallel, but one of the necessary conditions for the parallel operation of the transformers is that the groups of the two transformers are the same In order to realize the parallel operation of transformers, the problem of group consistency must be solved first. Therefore, at present, two mobile box-transformer vehicles carrying different groups of transformers are used, and the transformers with the same group are used according to the distribution network transformer group to be repaired or replaced. Other mobile boxes are converted into vehicles; although this method can solve the situation of non-stop operation, the staff need to choose between two vehicles when performing maintenance on different transformers, thus wasting the resources of an additional vehicle

[0005] In the currently known technology, there is no technical method to realize the group switching of the transformer and to ensure that the output of the low-voltage output terminal remains unchanged after switching.

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