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Instrument transformers, comprising voltage transformers (VTs) and current transformers (CTs), play crucial roles in power substations by providing isolated replicas of current or voltage for measurement and protection purposes. Voltage transformers reduce the primary voltage to levels suitable for relay operation and measurement, while current transformers scale down the primary current. The primary winding of a current transformer often consists of a single turn, achieved by threading the...

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Related Experiment Video

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A Simple Approach to Perform TEER Measurements Using a Self-Made Volt-Amperemeter with Programmable Output Frequency

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Published on: October 5, 2019

An accurate continuous calibration system for high voltage current transformer.

Yue Tong¹, Bin Hong Li

¹College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, Hubei Province, China.

The Review of Scientific Instruments

|March 3, 2011

Summary

This summary is machine-generated.

This study introduces a continuous calibration system for high voltage current transformers (HVCTs). The novel system allows energized calibration, improving efficiency and reducing costs with high accuracy.

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Area of Science:

Electrical Engineering
Metrology
Instrumentation

Background:

Traditional calibration of high voltage current transformers (HVCTs) is time-consuming and costly.
Existing calibration methods often require de-energizing power systems, leading to significant downtime and revenue loss.
There is a need for efficient, accurate, and on-site calibration solutions for HVCTs.

Purpose of the Study:

To develop and validate a continuous calibration system for HVCTs.
To enable in-service calibration of HVCTs without power interruption.
To achieve high accuracy and reliability in complex electromagnetic environments.

Main Methods:

Utilized an electronic instrument current transformer with a clamp-shape air core coil as the sensor.
Employed an optical fiber transmission system for signal transmission and power supply.
Implemented a digital integrator and a fourth-order convolution window algorithm for error calculation via a virtual instrument and PC.

Main Results:

The system successfully calibrated HVCTs while energized, avoiding system downtime.
Demonstrated a wide dynamic range and frequency band suitable for various applications.
Achieved a high accuracy class of 0.05, even in challenging electromagnetic field conditions.
On-site operations confirmed ease of use and reliability.

Conclusions:

The developed continuous calibration system offers a practical and efficient solution for HVCT calibration.
The system significantly reduces calibration time and associated costs.
Its high accuracy and operational simplicity make it suitable for practical power system applications.