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Direct-current resistive volt ratio boxes
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Available format(s): Hardcopy, PDF
Language(s): English
Published date: 15-07-1999
Publisher: British Standards Institution
National forewordCooperating organizations1 Scope2 Terms and definitions2.1 D.C. resistive volt ratio box (hereinafter designated "VRB")2.2 Rated voltage(s)2.3 Nominal voltage ratio2.4 True voltage ratio2.5 Circuit installation voltage (nominal circuit voltage)2.6 Auxiliary equipment2.7 Leakage current screen (circuit)2.8 Electrostatic screen2.9 Ripple content2.10 Common mode voltage2.11 Influence quantity2.12 Variation with influence quantity2.13 Reference conditions2.14 Reference value2.15 Reference range2.16 Nominal range of use2.17 Limiting values of an influence quantity2.18 Fiducial value2.19 Error2.20 Error expressed as a proportion of the fiducial value2.21 Intrinsic error2.22 Accuracy2.23 Accuracy class2.24 Class index2.25 Parasitic voltage3 Classification4 Limits of intrinsic error4.1 Permissible limits of intrinsic error4.2 Multiple ratio VRBs4.3 D.C. parasitic voltages5 Conditions for the determination of intrinsic errors6 Permissible variations6.1 Limits of variation6.2 Conditions for the determination of variations6.3 Variation due to common mode voltage (see Appendix A)7 Additional electrical and mechanical requirements7.1 Effect of self-heating7.2 Voltage tests and other safety requirements7.3 Insulation resistance test7.4 Limiting temperature for storage, transport and use8 Information, markings and symbols8.1 Information8.2 Markings, symbols and their locations8.3 Documentation8.4 Examples of the marking of a VRBAppendixA Determination of the effect of common mode voltage (see Figure 2)
Terms and definitions, classification, limits of intrinsic error, permissible variations with influence quantities, additional electrical and mechanical requirements, markings and symbols.
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