IEC 61557-12:2007

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
  3.1 General definitions
  3.2 Definitions related to uncertainty and performance
  3.3 Definitions related to electric phenomena
  3.4 Definitions related to measurement techniques
  3.5 Notations
4 Requirements
  4.1 General requirements
  4.2 PMD general architecture
  4.3 Classification of PMD
  4.4 List of applicable performance classes
  4.5 Operating and reference conditions for PMD
  4.6 Start-up conditions
  4.7 Requirements for PMD functions (except PMD-A)
  4.8 Requirements for PMD-A functions
  4.9 General mechanical requirements
  4.10 Safety requirements
  4.11 Analog outputs
5 Marking and operating instructions
  5.1 Marking
  5.2 Operating and installation instructions
6 Tests
  6.1 Type tests of PMD
  6.2 Type tests of PMD-A
  6.3 Routine tests
Annex A (informative) Definitions of electrical parameters
Annex B (normative) Definitions of minimum, maximum, peak
        and demand values
Annex C (informative) Intrinsic uncertainty, operating uncertainty,
        and overall system uncertainty
Annex D (informative) Recommended sensor classes for the
        different kinds of PMD
Annex E (normative) Requirements applicable to PMD and to PMD-A
Bibliography

Specifies requirements for combined performance measuring and monitoring devices that measure and monitor the electrical parameters within electrical distribution systems. These requirements also define the performance, in single and three-phase a.c. or d.c. systems having rated voltages up to 1 000 V a.c. or up to 1 500 V d.c. These devices are fixed installed or portable. They are intended to be used indoors and/or outdoors. This standard is not applicable for: - electricity metering equipment that complies with IEC 62053-21, IEC 62053-22 and IEC 62053-23. Nevertheless, uncertainties defined in this standard for active and reactive energy measurement are derived from those defined in the IEC 62053 standards series. - simple remote relays or simple monitoring relays. This standard is intended to be used in conjunction with IEC 61557-1 (unless otherwise specified), which specifies the general requirements for measuring and monitoring equipment, as required in IEC 60364-6. The standard does not include the measurement and monitoring of electrical parameters defined in Parts 2 to 9 of IEC 61557 or in IEC 62020. Combined performance measuring and monitoring devices (PMD), as defined in this standard, give additional safety information, which aids the verification of the installation and enhances the performance of the distribution systems. For instance, those devices help to check if the level of harmonics is still compliant with the wiring systems as required in IEC 60364-5-52. The combined performance measuring and monitoring devices (PMD) for electrical parameters described in this standard are used for general industrial and commercial applications. A PMD-A is a specific PMD complying with requirements of IEC 61000-4-30 class A, which may be used in "power quality assessment" applications.