Working method for replacing 10kV transformer through spare power automatic switching technology in electrified mode

Abstract

According to the working method for replacing a 10kV transformer through the spare power automatic switching technology in an electrified mode, a load wheeling system with two power supply spare power automatic switching control devices is adopted for work. The load wheeling system comprises a first power supply (1), a second power supply, a movable wheeling transformer or low-voltage electric generator set (2), a first power supply spare power automatic switching switch (1DL), a second power supply spare power automatic switching switch (2DL), an external cable (L), a first load switch (K1) and a second load switch (K2), wherein the first power supply spare power automatic switching switch (1DL), the second power supply spare power automatic switching switch (2DL) and the external cable (L) are arranged between the two power supplies. When the 10kV transformer at the front end of a cut-off point (3) of a power supply circuit of a low-voltage user (4) needs to be overhauled, electricity supply is achieved for the low-voltage user through the movable wheeling transformer or low-voltage electric generator set (2) instead; after the transformer (1) is overhauled, electricity supply is achieved for the low-voltage user through the transformer again; according to the principles of the bypass technology and the spare power automatic switching technology, load wheeling is not limited by time or place or power supply any more, power outage prevention is ensured for the user, and power supply reliability of a power distribution network is improved.

Description

technical field [0001] The invention belongs to the technical field of bypass live operation, and is suitable for the situation that a low-voltage distribution transformer is transferred to maintenance, and realizes uninterrupted power supply to the back-end load of the maintenance transformer by using the principle of bypass live operation and dual-power backup self-injection. Background technique [0002] Continuous power supply is the basic requirement of all sectors of the national economy for electricity. With the continuous development of my country's economic construction, the reliability of urban power supply has become a key assessment index for power supply units. Improving the reliability of power supply has become an important task for the current power sector. Vigorously promoting 10kV line live work is the key to future maintenance of urban distribution networks. The development direction of management is also the main measure to replace power outage maintenance...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the low-voltage load transfer equipment is limited by the parallel operation conditions of the transformers and cannot provide reliable power supply, and to provide a method of replacing the 10kV transformer with the technology of standby self-switching when live

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