Measurement of the Phase Angle Errors of High Current Shunts at Frequencies up to 100 kHz

Abstract

This paper describes a new method for determining phase angle errors of shunts with rated currents at 50 and 100 A at frequencies from 25 to 100 kHz. The method is based on the use of a three-branch binary inductive current divider to measure the phase angle errors of high current shunts against a phase angle reference standard with only one step. An inductive high current shunt has been designed using a 100:1 current transformer connected in parallel with a 1-Ω shunt. The phase angle errors of resistive high current shunts and the inductive high current shunt have been measured. The level dependence in phase angle errors of three different types of high current shunts has been evaluated at currents from 1 to 100 A. The measurement results and standard uncertainties of the phase angle errors of high current shunts are reported.Index Terms-Binary inductive current divider (BICD), current transformer (CT), inductive high current shunt, inductive voltage divider (IVD), level dependence, phase angle errors.

Wideband Current Transducer Traceable Calibration up to 10 A and 1 MHz

“…The calibration methods used in metrology laboratories to characterize current shunts are limited in frequency to 100 kHz for 10 A and allow the measurement of a single parameter: either the AC–DC difference or the phase angle. These methods are based on the following principles: the direct comparison method [ 33 , 34 , 35 , 36 ], thermal transfer method [ 37 ], potentiometer method [ 38 ] and Vector Network Analyzer (VNA) method [ 39 ]. The VNA is an instrument that measures the frequency response of a component (passive in our case) and is mainly used for RF and high frequency (typically frequencies above 1 MHz) applications.…”

“…For the magnitude calibration of current transducers, it is mainly necessary to characterize the AC–DC difference of the current shunts. For currents of 10 A, the calibration methods based on the direct comparison principle [ 33 , 34 , 35 , 36 ] and the thermal transfer principle [ 37 ] are limited in frequency to 100 kHz, and do not allow for guaranteeing the traceability of the current transducer calibration between 100 kHz and 1 MHz. This limitation is mainly due to the standards used, calibrated up to 100 kHz, and to the supply source, which does not allow the generation of 10 A and 1 MHz.…”

Field Test Method and Equivalence Analysis of Delay Characteristics of DC Electronic Current Transformer

“…According to the requirements of GB/T 26216.1, IEC 61869, and other related stand ards, the field test system of the DC electronic transformer delay characteristics [6][7][8][9][10] i built as shown in Figure 6. This equipment is designed to obtain a greater primary current output with smal impedance.…”

“…Reference [6] proposes a 3D magnetic-field model to analyze the impact of the magnetic sensor circular array position on current measurements, which successfully maintains accuracy class 1.0 under various position deviations in balanced or unbalanced three-phase power delivery systems. References [7,8] study from the perspective of shunt to improve measurement accuracy. Reference [9] proposes that the disparity in practical environmental conditions, which influences the proximity electric field, is a significant reason for active electronic voltage transformers exhibiting excessive errors at substation sites.…”

LabVIEW‐based real‐time error compensation system for measurement current transformer using piecewise linearisation

“…The behaviour of CTs in the presence of harmonic distortion according to the frequency response approach is discussed in [29]. In [30], a method to measure the phase angle errors of a high current shunt by comparison against a low current phase angle reference in step at frequencies from 25 to 100 kHz is described. The method is based on the use of a three-branch binary inductive current divider to measure the phase angle errors.…”