BS EN 60255-151:2009:2010 Edition
$167.15
Measuring relays and protection equipment – Functional requirements for over/under current protection
| Published By | Publication Date | Number of Pages |
| BSI | 2010 | 36 |
IEC 60255-151:2009 specifies minimum requirements for over/under current relays. It includes a specification of the protection function, measurement characteristics and time delay characteristics. Defines the influencing factors that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | English CONTENTS |
| 8 | 1 Scope and object 2 Normative references 3 Terms and definitions |
| 10 | 4 Specification of the function 4.1 General 4.2 Input Energizing quantities / energizing quantities Figures Figure 1 – Simplified protection function block diagram |
| 11 | 4.3 Binary input signals 4.4 Functional logic |
| 12 | Figure 2 – Overcurrent independent time characteristic Figure 3 – Undercurrent independent time characteristic |
| 13 | Figure 4 – Dependent time characteristic |
| 15 | Figure 5 – Definite time reset characteristic |
| 16 | Figure 6 – Definite time reset characteristic (alternative solution with instantaneous reset after relay operation) |
| 17 | Figure 7 – Dependent time reset characteristic |
| 18 | 4.5 Binary output signals 4.6 Additional influencing functions/conditions 4.7 Specific characteristics Figure 8 – Dependent time reset characteristic (alternative solution with instantaneous reset after relay operation) |
| 19 | 5 Performance specification 5.1 Accuracy related to the characteristic quantity Figure 9 – Voltage restrained characteristics Figure 10 – Voltage controlled characteristics |
| 20 | 5.2 Accuracy related to the operate time 5.3 Accuracy related to the reset time Tables Table 1 – Multiplier factor on operated time assigned error |
| 21 | 5.4 Transient performance 5.5 Current transformer requirements Table 2 – Multiplier factor on reset time assigned error |
| 22 | 6 Functional test methodology 6.1 General 6.2 Determination of steady state errors related to the characteristic quantity |
| 25 | 6.3 Determination of steady state errors related to the start and operate time 6.4 Determination of steady state errors related to the reset time Table 3 – Test points for overcurrent elements Table 4 – Test points for undercurrent elements |
| 26 | 6.5 Determination of transient performance Table 5 – Test points for overcurrent elements Table 6 – Test points for undercurrent elements |
| 27 | Figure 11 – Typical test waveform for transient overreach |
| 28 | Figure 12 – Test waveform Table 7 – Recommended values for the test |
| 29 | 7 Documentation requirements 7.1 Type test report 7.2 Other user documentation |
| 31 | Annex A (normative) Constants for dependent time operating and reset characteristics Table A.1 – Constants for dependent time operating and reset characteristics |
| 32 | Annex B (informative) Reset time determination for relays with trip output only Figure B.1 – Dependent reset time determination |
| 33 | Bibliography |
