Calibrating apparatus for electronic transducer calibration instrument based on alternating current bridge balance principle

Abstract

The invention relates to a calibrating apparatus for an electronic transducer calibrator based on an alternating current bridge, which comprises a frequency and voltage stabilization source, an alternating current bridge, a standard sampling device, a protocol conversion unit and a synchronous signal generator, wherein the frequency and voltage stabilization source provides an alternating currentvoltage with adjustable frequency and amplitude of 0-100V to be output to a calibrated electronic transducer calibrator (ELTC) and the alternating current bridge; the alternating current bridge can adjust the amplitude ratio, the phase difference and the accuracy between the input voltage and the output voltage of the alternating bridge to reach 0.2 level; the standard sampling device digitally samples the output of the alternating current bridge; the protocol conversion unit carries out data range conversion on the output of the standard sampling device and then forms the output to a data frame which is sent to the EITC through Internet; and the synchronous signal generator generates two paths of square wave signals with completely synchronous pulse porches, one path of square wave signals is sent to the detected EITC and the other path is sent to the standard sampling device to enable an analog-to-digital converter inside the EITC and the standard sampling device to be synchronouslystarted for sampling. The device can effectively obtain errors which are introduced when the EITC measures the errors of the electronic transducer.

Description

technical field [0001] The invention relates to a verification device, which is used to verify the measurement error of an electronic transformer calibrator (EITC) based on the principle of AC bridge balance. Background technique [0002] The electronic transformer (EIT) is different from the traditional transformer, its output is a digital quantity, which is transmitted by the IEC61850-9-1 standard. As a new type of power equipment, electronic transformers have begun to be used in digital substation pilot projects. [0003] The function of the electronic transformer calibrator (EITC) is to test the measurement error of the electronic transformer. At present, there are relatively mature technical solutions. EITC generally has three signal inputs: one is the network signal input port, which receives the input signal from the EIT. Digital output; one is a standard signal input port, which receives the secondary analog output from a traditional standard transformer (two grades...

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Problems solved by technology

[0004] But until today, the error verification of EITC itself has not been well resolved. The reason is that everyone uses a program-controlled digital source to generate two AC voltages with a certain amplitude ratio and phase difference in EITC, and the program-controlled digital source phase The poor setting value can never achieve the accuracy of 1' (1 / 60 degree relative to the power frequency), but according to the national standard, the phase error of EITC is required to be within 1'

This causes the phase error of EITC to be unable to be accurately defined

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