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PD IEC TR 63436:2026 Insulation monitoring device — Marine AC application example, 2026
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- CONTENTS
- FOREWORD
- INTRODUCTION
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, symbols and abbreviated terms [Go to Page]
- 3.1 Terms and definitions
- 3.2 List of symbols and abbreviations
- Tables [Go to Page]
- Table 1 – List of abbreviations
- 4 General considerations [Go to Page]
- Table 2 – Minimum values of insulation resistances
- 5 IT system in marine application
- Figures [Go to Page]
- Figure 1 – General schematic principle at first fault
- Figure 2 – System impedance
- 6 Touch voltage [Go to Page]
- Figure 3 – Simplified schematic and fault current equation
- 7 Application example [Go to Page]
- Table 3 – Example of ship contribution and situations
- Table 4 – Example of ship leakage capacitance
- Figure 4 – Fault current IF (A) versus RN (Ω) with RF = 0,01 Ω
- Figure 5 – Touch voltage Vc (V) versus RF(Ω) with RA = 0,2 Ω, RN = 1 MΩ and 1 500 Ω
- Figure 6 – Touch voltage Vc versus RF (Ω) with RA = 2 Ω, C1max and RN = 1 MΩ, 1 500 Ω, 100 Ω, and 10 Ω, voltage system at 690 V
- Figure 7 – Touch voltage Vc (V) versus RF (Ω) with RA = 2 Ω or 0,2 Ω with limit of 50 V and 25 V on Y axis
- Figure 8 – Fault current IF(A) versus RN (Ω) for different low values of RF (0,1 Ω, 1 500 Ω, 13,2 kΩ, 100 kΩ) and 30 mA in Y axis at 690 V
- Figure 9 – Setting of IMD (Ω)
- 8 Setting of IMD
- 9 IMD injection method: AC/DC
- 10 Insulation resistance tests
- 11 Conclusion [Go to Page]
- Table 5 – Summary of results
- Bibliography [Go to Page]
