Integration challenges of high-accuracy LPIT into MV recloser

Abstract

This paper presents the lessons learned and challenges of developing an integrated solution of high accuracy LowPower Instrument Transformer (LPIT) into a medium voltage (MV) recloser. The challenges from a design, testing and end user acceptance will be presented. The main conclusion of this paper is that integration of typically separate network components requires careful design choices and testing beyond existing industry standards for LPIT and MV reclosers in order to achieve higher accuracy classes.

Measurement of Dynamic Voltage Variation Effect on Instrument Transformers for Power Grid Applications

“…If the two measuring device are assumed identical, linear and accurately synchronised, and are used to measure the same distorted voltage signal, the evaluated quantities (2), (4) and (5) can represent the errors introduced by the VT under test when it is used for syncrophasor measurement. Same consideration ca be done if the PQ event measurement is considered.…”

“…Nowadays, several new kinds of voltage and current instrument transformers (active or passive, generally referred to as Low Power Instrument Transformers, LPIT) are available [5], but inductive voltage and current transformers (VTs and CTs) are still widely employed. The metrological performances of these sensors in presence of distorted signals significantly depend on their operating principles [6]- [11].…”

Low-Power Voltage Transformer Smart Frequency Modeling and Output Prediction up to 2.5 kHz, Using Sinc-Response Approach

“…In terms of accuracy assessment, Ref. [ 3 , 4 , 5 ] represent the efforts on the installation, traceability and challenges of integration in LPVTs. The uncertainty analysis of the ITs and their calibration test bed as a key factor for measurement, is performed in [ 6 , 7 , 8 , 9 , 10 ], while the nonlinearity compensation is assessed in [ 11 ] for voltage and current ITs.…”