Secondary voltage acquisition system for main transformer low-voltage side of new energy booster station

Abstract

The invention discloses a secondary voltage acquisition system for a main transformer low-voltage side of a new energy booster station. The secondary voltage acquisition system comprises a main transformer, an all-insulation tubular bus, a # 1 35kV main transformer incoming cabinet, a # 2 35kV main transformer incoming cabinet, a PT cabinet, a 35kV I-section bus and a 35kV II-section bus. The low-voltage side of the main transformer is connected with the input end of the # 1 35kV main transformer inlet wire cabinet, the input end of the # 2 35kV main transformer inlet wire cabinet and the PT cabinet through all-insulation tubular buses, the output end of the # 1 35kV main transformer inlet wire cabinet is connected with the 35kV I-section bus, and the output end of the # 2 35kV main transformer inlet wire cabinet is connected with the 35kV II-section bus. According to the system, the cost of a grid-connected new network energy system can be reduced, and the stability of the grid-connected new network energy system is improved.

Description

technical field [0001] The invention relates to a voltage acquisition system, in particular to a secondary voltage acquisition system on the low-voltage side of a main transformer of a new energy step-up station. Background technique [0002] Due to the limitation of 35kV circuit breaker manufacturing level, the low-voltage 35kV side of the main transformer with a capacity greater than 180MVA generally adopts the expansion unit connection, that is, the low-voltage side of the main transformer is connected to two 35kV busbars through two 35kV main transformer incoming cabinets. Usually, for this type of wiring, one PT cabinet is installed on the two sections of 35kV bus, and two PT cabinets are configured in total. Each PT cabinet is used for the measurement and control protection device, metering device and main transformer protection and measurement and control device of each circuit on the 35kV section where it is located. , Measure and protect the secondary voltage; there...

AI Technical Summary

Problems solved by technology

Usually, for this type of wiring, one PT cabinet is installed on the two sections of 35kV bus, and two PT cabinets are configured in total. Each PT cabinet is used for the measurement and control protection device, metering device and main transformer protection and measurement and control device of each circuit on the 35kV section where it is located. , Measure and protect the secondary voltage; there are two secondary voltage collection points, which are 35kV Section I busbar and 35kV Section II busbar; when the number of unit connections in the grid-connected new grid energy system increases, it will lead to The increase in the demand for PT cabinets increases the cost of the system sharply, and at the same time the complexity of the system is high, resulting in a decrease in the stability of the system

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