Method and device for checking power-factor angle of high voltage line of intelligent substation on site

Abstract

The invention discloses a method and a device for checking a power-factor angle of a high voltage line of an intelligent substation on site. Phase adjustable high voltage and large current experimental conditions are generated through a voltage regulator, a large current generator, a high voltage experimental power supply and a phase shifter, large current generated by the large current generatoris connected to a standard current transformer and an electronic current transformer, high voltage generated by the high voltage experimental power supply is connected to a standard voltage transformer and an electronic voltage transformer, a digital signal processed by the electronic transformers and a combination unit and an analog signal of the standard voltage and current transformers are simultaneously connected to an electronic transformer comprehensive checking instrument, and the electronic transformer comprehensive checking instrument compares an error of two power-factor angles. By the invention, the influence of electronic transformers, the combination unit, a data transmission network and the like on errors of the power-factor angles can be obtained, so that related parametersare regulated to ensure the power-factor angle measuring and electric energy metering accuracy.

Description

technical field [0001] The invention belongs to the field of electric energy measurement, and particularly relates to an on-site calibration method and device for measuring high-voltage line power factor angle errors based on electronic transformers and merging units in an intelligent substation, which can perform on-site calibration on the error of the high-voltage line power factor angle of the substation test. Background technique [0002] At present, my country has incorporated smart grid into the implementation plan in the field of power transmission and distribution engineering technology, and smart substations using the latest cutting-edge technology have begun pilot construction and operation. The accuracy and reliability of power parameter measurement and electric energy metering is an important guarantee for the successful application of this new technology. Electronic transformers in smart substations are used as voltage and current transformers for measurement, ...

AI Technical Summary

Problems solved by technology

In this method, the insulation voltage of the standard current transformer and the current booster to the ground is low, and it cannot simulate the actual working environment of the transformer installed on site, that is, it does not have the conditions of high voltage and high current at the same time, and it is impossible to realize the primary line. Measurement of voltage and current power factor angle

Moreover, the phase angle between the primary high voltage and the large current output by the traditional step-up and step-up device is also difficult to adjust from 0 to 360°; Function of power factor angle between current transformers

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