BS EN IEC 61869-14:2019
$189.07
Instrument transformers – Additional requirements for current transformers for DC applications
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 48 |
IEC 61869-14:2018 provides all requirements specific to current transformers to be used in DC applications (DCCTs), whatever the technology used. The output signal can be analogue or digital. It is applicable to newly manufactured current transformers used for measuring, protection and/or control applications in DC power systems with a rated voltage above 1,5 kV. The general configuration of a single-pole low-power instrument transformer is described in Figure 601 of IEC 61869-6:2016. The DCCTs intended for current measurement in the transistor branch of the VSC valve (referred to as CT4a and CT4b in Figure 1403 and Table 1402) are not covered by this document, and will be considered in a future revision. IEC 61869-14:2018 applies to current transformers intended to be used in DC applications with at least one of the following functions: • measure DC current (with significant harmonics); • withstand DC voltage. Depending on the position on the DC system, different kinds of application exist, which are briefly described below, together with the approximate voltage or current wave shape.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 5 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 7 | English CONTENTS |
| 9 | FOREWORD |
| 12 | INTRODUCTION Figures Figure 1401 – Example of LCC scheme |
| 13 | Figure 1402 – Typical scheme for VSC – symmetrical monopole Tables Table 1401 – Current and voltage in current transformers for LCC application |
| 14 | Figure 1403 – Typical scheme for VSC – asymmetrical monopole or bipole |
| 15 | Table 1402 – Current and voltage in current transformers for VSC application |
| 16 | 1 Scope 2 Normative references 3 Terms and definitions |
| 19 | Figure 1404 – Typical step responses of a system |
| 21 | 5 Ratings |
| 22 | Table 3 – Partial discharge test voltages and permissible levels |
| 24 | Figure 1405 – Accuracy limits of a DCCT Table 1403 – Limits of ratio error for DCCT (classes from 0,1 to 1) |
| 25 | 6 Design and construction |
| 26 | Table 7 – Static withstand test loads |
| 27 | Table 8 – Arc fault duration and performance criteria |
| 28 | Table 1404 – Markings of terminals |
| 29 | Table 1405 – Rating plate marking for common rating plate Table 1406 – Rating plate marking for each secondary converter |
| 30 | 7 Tests Table 1407 – Rating plate marking for auxiliary power supply |
| 31 | Table 10 – List of tests |
| 35 | Figure 1406 – Polarity reversal test profile |
| 37 | Figure 1407 – Measurement of the step response time |
| 42 | Annex 14A(informative)Equivalent thermal current in CTs for DC application 14A.1 General 14A.2 Current harmonic content Figure 14A.1 – Typical waveform of current flowing in the primary conductor for LCC applications |
| 43 | 14A.3 Losses in primary conductor due to harmonic content Table 14A.1 – Typical harmonic current values (800 kV LCC) |
| 44 | Figure 14A.2 – The two terms that make up the total losses in the primary conductor |
| 45 | 14A.4 Thermal test with AC current Figure 14A.3 – Additional losses in conductors due to typical current harmonics Figure 14A.4 – Power-frequency losses in conductors compared to DC losses |
| 46 | Annex 14B(informative)Proposed rated insulation level applicable tocurrent transformers for DC application Table 14B.1 – Proposed rated primary terminal insulation levels for current transformers for DC application |
| 47 | Bibliography |
