1 Scope
This part of GB/T 3048 specifies terms and definitions, test equipment, specimen preparation, test procedure, precautions, calibration of test instruments and test records for partial discharge test.
This test method is applicable to partial discharge measurements on lengths of extruded power cable, i.e., to measure and check that the discharge magnitude does not exceed a specified value, at a specified voltage with a given sensitivity.
Reference is made to IEC 60270:1981 which gives the techniques and considerations applicable to partial discharge measurements in general.
This part shall be used in combination with GB/T 3048.1.
2 Normative references
The following documents contain provisions which, through reference in this part of GB/T 3048, constitute provisions of this part. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 2900.19 Electrotechnical terminology - High- voltage test technique and insulation co-ordination
GB/T 3048.1 Test methods for electrical properties of electric cables and wires - Part 1: General
GB/T 3048.8-2007 Test methods for electrical properties of electric cables and wires - Part 8: AC voltage test
JB/T 10435 Inspection methods for partial discharge testing system of electric cables
IEC 60270:1981 Partial discharge measurements
3 Terms and definitions
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test instruments
5 Specimen preparation
6 Test procedure
7 Precautions
8 Calibration of test instruments
9 Test records
Annex A (Informative) Comparison between this part and IEC 60885-3: 1988 in clause number
Annex B (Normative) Plotting double pulse diagram
Annex C (Normative) The requirement for the terminal impedance
C.1 Composition of terminal impedance
C.2 RC elements
C.3 RLC element series resonance line)
Annex D (Informative) Technical conditions for fully shielded partial discharge test system
D.1 Independent power supply
D.2 Filtering system of power supply
D.3 Isolation floor
D.4 Fully shielded room
D.5 Test equipment and testing instrument
D.6 Precautions
