Accuracy and Suitability of the CT Circuit in the Ref and Differential Relay Functions in the Digital Substation System

EasyChair Preprint 15248

Abstract

The perturbation of Transformer #2 at Digital Substation System (DSS) Baturaja, which results in the operation of the Restricted Earth Fault (REF) LV, has resulted in numerous enhancements. One of these enhancements is the replacement of the neutral LV positioning of the current transformer (CT). This was initially located in SAM600-CT2 and has since been relocated to SMU615, which is located in the 20kV SAS Panel. The SAM600-CT2 processes data using a digital substation system-based standardization, specifically the IEC61850 Standard, which is a protocol for digital data exchange between devices and can process data in digital form. In this enhancement, it is necessary to evaluate the replacement of this position, either from the circuit or the position's accuracy. In order to guarantee this, a stability test was implemented. The CT differentiator and CT REF circuits were subjected to testing. It is assembled as required with AC system injection, and the anticipated outcomes are consistent. Stability testing is conducted on a 3-phase transformer with a capacity of 60 MVA in this journal. The transformer is connected to a digital substation system with a voltage of 150 kV/20 kV and an Alternate Current (AC) circuit. A process bus is present in one of the digital substation system architectures to facilitate the digitization process. In order to render the substation automation system measurable, flexible, and efficient, all analog values are converted to digital values. Digital values are directly derived from the digitally measured value data stream by protection relays.

Keyphrases: Digital Subtation System, Restricted Earth Fault, Stablility, differential

@booklet{EasyChair:15248,
  author    = {Mohamat Abdul Khoir and Jangkung Raharjo and Kharisma Bani Adam},
  title     = {Accuracy and Suitability of the CT Circuit in the Ref and Differential Relay Functions in the Digital Substation System},
  howpublished = {EasyChair Preprint 15248},
  year      = {EasyChair, 2024}}