Insulation Resistance Testing of Low Voltage （低电压的绝缘电阻测试）.pdfVIP

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Insulation Resistance Testing of Low Voltage （低电压的绝缘电阻测试）.pdf

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Insulation Resistance Testing of Low Voltage （低电压的绝缘电阻测试）

Insulation Resistance Testing of Low Voltage Cables in the Field 25 June 2010 Table of Contents 1. Background3 1.1. Before Making Measurements3 1.2. How to Apply the Temperature Correction Factor 4 1.2.1. Calculation4 1.2.2. Multiplication Factor Lookup4 1.3. “Go / No Go” Minimum Acceptable Insulation Resistance Value5 2. Installation Testing 5 2.1. Procedure 6 3. Preventative Maintenance Testing 6 3.1. Procedure 7 4. Summary7 Appendix A: Insulation Resistance Temperature Correction Factors10 Notes 11 References CSA C22.2 No. 2556 / UL 2556, “Wire and Cable Test Methods” IEEE 525, “Guide for the Design and Installation of Cable Systems in Substations” NETA ATS-2009, “Standard for Acceptance Testing Specifications for Electrical Power Equipment and Systems” Warning: Insulation resistance testing should be done by qualified personnel, familiar with both insulation resistance testing and with the safe operation of the test equipment. Consult the insulation resistance test equipment manual or manufacturer for insulation resistance testing procedures and recommended safety guidelines. This document is intended to be a guideline only. Page 2 of 12 25 June 2010 1. Background The following is a summary of insulation resistance (IR) testing (commonly referred to as “megger testing”) of low voltage cables (rated less than 5 kV), recognized by Nexans. This document will focus only on the tests that are of importance for field installer