IEC 61557-13 pdf download.Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. – Equipment for testing, measuring or monitoring of protective measures
1 Scope
This part of IEC 61 557 defines special performance requirements for hand-held and hand- manipulated current clamps and sensors for measurement of leakage currents in electrical distribution systems up to 1 000 V a.c. and 1 500 V d.c., taking into account the influence of high external low-frequency magnetic fields and other influencing quantities. This standard does not apply to current clamps or sensors which are used in combination with devices for insulation fault location according to IEC 61 557-9, unless it is specified by the manufacturer.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61 000-4-8:2009, Electromagnetic compatibility (EMC) – Part 4-8: Testing and measurement techniques – Power frequency magnetic field immunity test IEC 61 01 0-1 , Safety requirements for electrical equipment for measurement, control and laboratory use – Part 1: General requirements IEC 61 01 0-2-030, Safety requirements for electrical equipment for measurement, control, and laboratory use – Part 2-030: Particular requirements for testing and measuring circuits IEC 61 01 0-2-032:2002, Safety requirements for electrical equipment for measurement, control, and laboratory use – Part 2-032: Particular requirements for hand-held and hand-manipulated current sensors for electrical test and measurement IEC 61 326-1 , Electrical equipment for measurement, control and laboratory use – EMC requirements – Part 1: General requirements IEC 61 326-2-2, Electrical equipment for measurement, control and laboratory use – EMC requirements – Part 2-2: Particular requirements – Test configurations, operational conditions and performance criteria for portable test, measuring and monitoring equipment used in low- voltage distribution systems
3 Terms and definitions
For the purposes of this document, the definitions given in IEC 61 557-1 and the following definitions apply.3.1 hand-held and hand-manipulated current clamps and sensors portable or hand-held device for measurement, display or for indication of types of leakage currents in distribution systems without interruption of these circuits including defined attached equipment NOTE In the following text, only the expression “current sensors” is used. 3.2 fixing device device to fix the position of a conductor in relation to the current sensors 3.3 measurement category coordination of maximum transients to the working voltage according to IEC 61 01 0-2-030 3.4 variation E 1 1 variation due to external low frequency magnetic fields 3.5 variation E 1 2 variation due to load current during measurement using the differential method (see Annex A, Figure A.2) 3.6 variation E 1 3 variation due to touch current caused by common mode voltage during hand-manipulation 3.7 variation E 1 4 variation due to frequency 3.8 variation E 1 5 repeatability of the measurement readings due to at least 1 0 open / close cycles 3.9 operating class performance class defining the influence of external low frequency magnetic fields on the current sensors (see 4.2) 3.1 0 leakage current current driven by active conductors of a distribution system and/or loads to earth and/or protective conductors [IEC 60050-1 95:1 998, 1 95-05-1 5, modified] 3.1 1 load current current flowing through the line conductor/s 3.1 2 rated burden the value of the burden on which the accuracy requirements of a specification are based [IEC 60050-321 :1 986, 321 -01 -26]
4 Requirements
4.1 General The following requirements as well as those given in IEC 61 557-1 shall apply. Current sensors according to this standard shall comply with IEC 61 01 0-2-032. Current sensors according to this standard shall have the ability to measure leakage currents from 1 mA to 1 0 A a.c. and/or d.c. as a minimum and shall be designed for a load current of at least 60 A. Multiple ranges are allowed. The resolution shall be 0,1 mA a.c. and/or d.c or better. The indicated current values shall be r.m.s. values. The frequency range of the current sensors shall include the range beginning at 40 Hz up to the third harmonic of the rated mains frequency at the minimum. NOTE 1 For railway applications a frequency range beginning at 1 5 Hz is recommended. NOTE 2 For industrial applications a frequency range up to 1 kHz is recommended. NOTE 3 For testing the leakage current of appliances a measuring range starting at 0,1 mA with a resolution of 0,01 mA is recommended. 4.2 Operating classes 4.2.1 General According to their sensitivity for low frequency magnetic fields according to IEC 61 000-4-8 within the range of 1 5 Hz up to 400 Hz, current sensors are classified into 3 operating classes. 4.2.2 Operating class 1 Current sensors of operating class 1 shall be applicable to operate within external low frequency magnetic fields according to 4.2.1 up to a field strength of 1 00 A/m. The upper limit of field strength shall be marked on the pictogram according to 5.1 . 4.2.3 Operating class 2 Current sensors of operating class 2 shall be applicable to operate within external low- frequency magnetic fields according to 4.2.1 up to a field strength of 30 A/m. The upper limit of field strength shall be marked on the pictogram according to 5.1 .
IEC 61557-13 pdf download
