Current transformer capable of switching transformation ratios for metering off-grid energy of wind power plants

Abstract

A current transformer capable of switching transformation ratios for metering off-grid energy of wind power plants belongs to the technical field of wind power plant metering transformers and facilitates metering of the off-grid energy of wind power plants. According to the technical scheme, the current transformer capable of switching transformation ratios for metering the off-grid energy of wind power plants comprises a first winding circuit and a second winding circuit, wherein the second winding circuit comprises a signal actuating circuit, a signal acquisition circuit, a signal converting circuit and an overload protecting circuit, the second winding circuit comprises intermediate relays of ZJ1, ZJ2 an ZJ3, an overcurrent relay LJ1, an inverse power relay NGJ1, an outage delay time relay SJ1, an electrifying delay time relay SJ2, an electrifying delay time relay SJ3, a protection stop button SB1 and a bell D1. The current transformer capable of switching transformation ratios for metering the off-grid energy of wind power plants is suitable for an electric power sector.

Description

technical field [0001] The invention discloses a switchable variable ratio current transformer for off-grid electricity metering in a wind farm, belonging to the technical field of wind farm metering transformers. Background technique [0002] At present, the power grid is ushering in the climax of large-scale wind farms connected to the system. As a new type of clean energy, wind power is of great significance for improving the energy structure. Determinism puts forward high requirements on power grid operation and management. [0003] From the perspective of electricity marketing, the off-grid electricity metering of wind farms has become one of the important problems to be solved urgently. The configuration is set according to the needs of on-grid electricity and on-grid power transmission. The wind farm has a large on-grid current, so it is necessary to configure a current transformer with a large transformation ratio to measure the on-grid electricity; when off-grid, t...

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Problems solved by technology

[0003] From the perspective of electricity marketing, the off-grid electricity metering of wind farms has become one of the important problems to be solved urgently. The configuration is set according to the needs of on-grid electricity and on-grid power transmission. The wind farm has a large on-grid current, so it is necessary to configure a current transformer with a large transformation ratio to measure the on-grid electricity; when off-grid, the load and the corresponding current are only the average current on the grid Taking a wind farm with an installed capacity of 100,000 kilowatts as an example, the maximum power on the grid can reach 100,000 kilowatts, while the maximum off-grid power is only more than 3,000 kilowatts. In the non-linear region of extremely small current, the measurement error is very large. Therefore, it is very prominent and urgent to try to solve the problem of inaccurate measurement of off-grid electricity in wind farms

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