BS EN IEC 61869-10:2018
$189.07
Instrument transformers – Additional requirements for low-power passive current transformers
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 48 |
This part of IEC 61869 is a product standard and covers only additional requirements for low-power passive current transformers. The product standard for low-power passive current transformers comprises IEC 61869‑1 , together with IEC 61869‑6 and this document with specific requirements.
This document is applicable to newly manufactured low-power passive current transformers with analogue output for use with electrical measuring instruments or electrical protective devices having a rated frequency from 15 Hz to 100 Hz.
This document covers low-power passive current transformers used for measurement or protection and multi-purpose low-power passive current transformers used for both measurement and protection.
Subclause 5.6.1001 covers the accuracy requirements that are necessary for low-power passive current transformers for use with electrical measuring instruments.
Subclause 5.6.1002 covers the accuracy requirements that are necessary for low-power passive current transformers for use with electrical protective relays, and particularly for forms of protection in which the prime requirement is to maintain the accuracy up to several times the rated current. If required, the transient accuracy of low-power passive current transformers during fault is also given in 5.6.1002.
Low-power passive current transformers have analogue voltage output only (for digital output or for technology using any kind of active electronic components refer to IEC 61869‑8 2 ). Such low-power passive current transformers can include the secondary signal cable (transmitting cable). The principle of operation of derivative low-power passive current transformers using air-core coils (Rogowski coils) is given in Annex 10B and the principle of operation of proportional low-power passive current transformers using iron-core coils with integrated shunt is given in Annex 10C.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 7 | English CONTENTS |
| 9 | FOREWORD |
| 13 | INTRODUCTION Figures Figure 1001 – General block diagram of a single-phase low-powerpassive current transformer |
| 14 | 1 Scope 2 Normative references |
| 15 | 3 Terms and definitions 3.1 General definitions 3.4 Definitions related to accuracy |
| 18 | 3.7 Index of abbreviations 5 Ratings 5.3 Rated insulation levels and voltages |
| 19 | 5.5 Rated output 5.6 Rated accuracy class |
| 20 | Tables Table 1001 – Limits of ratio error and phase error for measuring passive LPCT |
| 21 | 5.1001 Standard values for rated primary current (Ipr) 5.1002 standard values for rated extended primary current factor (Kpcr) 5.1003 Standard value of rated continuous thermal current (Icth) Table 1002 – Limits of errors |
| 22 | 5.1004 Standard values of rated secondary voltage (Usr) 5.1005 Short-time current ratings 5.1006 Rated phase offset (φor) 6 Design and construction 6.11 Electromagnetic compatibility (EMC) 6.13 Markings |
| 23 | Figure 1002 – Marking of terminals |
| 24 | 6.601 Requirements for optical transmitting system and optical output link 6.602 Requirements for electrical transmitting system and electrical wires for output link 6.603 Signal-to-noise ratio 6.604 Failure detection and maintenance announcement 6.605 Operability 6.606 Reliability and dependability Table 1003 – Pin assignment for RJ45 connectors used in passive LPCT |
| 25 | 6.607 Vibrations 7 Tests 7.1 General Table 10 – List of tests |
| 26 | 7.2 Type tests |
| 29 | Figure 1003 – Test set up for impact of magnetic field from other phases |
| 30 | 7.4 Special tests 601 Information to be given with enquiries, tenders and orders 601.1 Designation |
| 31 | 601.2 Dependability Table 1004 – Designation of a passive LPCT |
| 32 | Annex 10A (informative) Designation of accuracy class when using the corrected transformation ratio and ratio correction factor 10A.1 General |
| 33 | 10A.2 Designation of accuracy class based on rated transformation ratio 10A.3 Designation of accuracy class based on individual ratio correction factor 10A.4 Example of application Figure 10A.1 – Accuracy class designation improved basedon individual ratio correction factor CFI |
| 34 | Figure 10A.2 – Accuracy test of passive LPCT Table 10A.1 – Ratio, ratio error based on mean value,and corresponding primary current |
| 35 | Figure 10A.3 – Accuracy class of 1 % designated based on rated transformation ratio Table 10A.2 – Measured ratio error, correction factor and ratio error basedon ratio correction factor for five passive LPCT |
| 36 | Figure 10A.4 – Accuracy class of 0,1 % designated based on using the ratio correction factor and corrected transformation ratio |
| 37 | Annex 10B (informative) Principle of operation of Rogowski coils 10B.1 General 10B.2 Principle of operation |
| 38 | 10B.3 Designs 10B.4 Accuracy |
| 40 | 10B.5 Frequency dependence and response Figure 10B.1 – Rogowski coil Equivalent Circuits Figure 10B.2 – Integrated and non-integrated Rogowski coil output signals |
| 41 | Figure 10B.3 – Rogowski coil frequency dependence test |
| 42 | Annex 10C (informative) Principle of operation of low-power iron core current transformers (proportional LPCT) 10C.1 General 10C.2 Principle Figure 10C.1 – Principle of iron core current transformer |
| 43 | 10C.3 Accuracy Figure 10C.2 – Equivalent circuit of the iron corecurrent transformer with voltage output |
| 44 | Annex 10D (normative) Test for accuracy with respect to the positioning of the primary conductor 10D.1 General 10D.2 Designation of accuracy class extension Figure 10D.1 – Definition of the angle between the primary conductor and the LPCT Table 10D.1 – Limits for the position of the primaryconductor with respect to the passive LPCT |
| 45 | 10D.3 Test procedure Figure 10D.2 – Illustration of the primary conductorposition according to the position factor |
| 46 | Figure 10D.3 – Accuracy measurement test set up |
| 47 | Bibliography |
