A power supply system for safety section of a generating set and switching method thereof

Abstract

The invention discloses a security section power supply system of a generating set and a switching method thereof, which includes an off-site security isolation transformer, a first security section power supply unit and a second security section power supply unit, wherein the first security section power supply unit and the second security section power supply unit The power supply unit of the security section includes the low-voltage side switch 1 of the off-site security isolation transformer, the first incoming line switch of the 400V security PC section of the No. 1 generator set, the generator set unit, the first power supply module and the second power supply module, the system and its switching method It can effectively improve the safety, reliability and flexibility of the power supply system in the security section.

Description

Technical field [0001] The present invention belongs to the technical field of the power supply system of the power generator, which relates to a power supply system and a switching method therefor. Background technique [0002] The security segment power system of the generator set is an important part of the power plant. The security segment bus contacts the important load of the security downtime to ensure the safety of the unit, and the power loss of the security segment is one of the most serious failures. The security segment of the conventional generator set The power supply system reserve power is only configured with diesel generator sets, and the factory security isolation transformer is not configured. At the same time, the security segment power supply system switching logic is usually implemented by the PLC, from the projection or ASICO switch, which mainly exists as follows : [0003] (1) Poor security: The reserve power is only configured in diesel generator. When ...

AI Technical Summary

Problems solved by technology

[0003] (1) Poor safety: the backup power supply is only equipped with a diesel generator set. When the power supply of the security section of the generator set loses power, it can only rely on the diesel generator set to provide power, and the backup power supply is single.

[0004] (1) Poor reliability: It is stipulated in the "Technical Regulations for Power Design of Thermal Power Plants" (DL / T5153-2014) that diesel generator sets should adopt fast self-starting emergency, and the power supply will be restored by self-starting for the first time after power failure The best time is 15~20s

During the self-starting process of the diesel generator set, the busbar in the security section is in a power-off state, and the power-off time is long

[0005] (2) Poor flexibility: single switching starting mode, single switching mode, single closing mode

[0006] To sum up, the power supply system of the security section of the existing generator set is difficult to meet the safety, reliability and flexibility requirements of the current power system

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