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IEC 61869-15:2018

Instrument transformers - Part 15: Additional requirements for voltage transformers for DC applications

Edition date: 2018-07-17
In Force
Available languages: English, French
Summary: IEC 61869-15:2018 provides all requirements specific to voltage transformers to be used in DC applications (DCVTs), whatever the technology used. The output signal can be analogue or digital.
It is applicable to newly manufactured voltage transformers used for measuring, protection and/or control applications in DC power systems with a rated voltage above 1,5 kV.
This document covers passive voltage dividers as well as active voltage transformers, used for measurement, control and protection.
The general configuration of a single-pole low-power instrument transformer is described in Figure 601 of IEC 61869-6:2016.
IEC 61869-15:2018 applies to voltage transformers (VT) intended to be used in DC applications with the following functions:
• measure DC voltage (with significant harmonics);
• withstand DC voltage.
Two main technologies of DC converters exist today: LCC and VSC
• Line-commutated converters (LCC) are based on thyristor converters. They are characterized by a single direction of current flow, and a voltage polarity reversal possibility. Significant voltage and current harmonics exist up to frequencies of about 3 kHz to 4 kHz.
• Voltage source converters (VSC) are based on transistor converters. They are characterized by a bi-directional current flow and a single voltage polarity. Voltage and current harmonics exist up to frequencies of about 20 kHz.

IEC 61869-15:2018 couvre toutes les exigences particulières concernant les transformateurs de tension utilisés dans les applications en courant continu (transformateurs de tension pour courant continu), quelle que soit la technologie utilisée. Le signal de sortie peut être analogique ou numérique.
Elle s'applique aux transformateurs de tension fabriqués récemment et utilisés pour des applications de mesure, de protection et/ou de commande sur des systèmes d'alimentation électrique en courant continu dont la tension assignée est supérieure à 1,5 kV.
Le présent document couvre les diviseurs de tension passifs et les transformateurs de tension actifs utilisés à des fins de mesurage, de commande et de protection.
La configuration générale d'un transformateur de mesure de faible puissance unipolaire est décrite à la Figure 601 de l'IEC 61869-6:2016.
IEC 61869-15:2018 s'applique aux transformateurs de tension (VT, Voltage Transformer) destinés à être utilisés dans les applications en courant continu avec les fonctions suivantes:
• mesurage de la tension continue (avec des harmoniques élevées);
• tension continue de tenue.
Il existe aujourd'hui deux principales technologies de convertisseur de courant continu: les convertisseurs commutés par le réseau (LCC, Line-Commutated Converter) et les convertisseurs de source de tension (VSC, Voltage Source Converter)
• Les convertisseurs commutés par le réseau (LCC) sont basés sur les convertisseurs à thyristor. Ils se caractérisent par un flux de courant unidirectionnel et la possibilité d'inverser la polarité de la tension. Des harmoniques de tension et de courant élevées existent jusqu'à des fréquences d'environ 3 kHz à 4 kHz.
• Les convertisseurs de source de tension (VSC) sont basés sur les convertisseurs à transistor. Ils se caractérisent par un flux de courant unidirectionnel et une polarité de tension unique. Des harmoniques de tension et de courant élevées existent jusqu'à des fréquences d'environ 20 kHz.
ICS: 17.220.20-Measurement of electrical and magnetic quantities
CTN: TC 38 - 1241

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