MEASURING RELAYS AND PROTECTION EQUIPMENT - PART 149: FUNCTIONAL REQUIREMENTS FOR THERMAL ELECTRICAL RELAYS
International Electrotechnical Committee
FOREWORD<br>1 Scope<br>2 Normative references<br>3 Terms and definitions<br>4 Specification of the function<br>5 Performance specification<br>6 Functional test methodology<br>7 Documentation requirements<br>Annex A (informative) - Simple first-order thermal <br> model of electrical equipment<br>Annex B (informative) - Thermal electrical relays <br> which use temperature as setting parameters<br>Bibliography
Defines minimum requirements for thermal protection relays and also contains specification of the protection function, measurement characteristics and test methodologies.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 95 |
| Supersedes |
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