IEEE 82-2002 pdf free.IEEE Standard Test Procedure for Impulse Voltage Tests on Insulated Conductors.
Insulated conductors in service are subjected to voltage surges from lightning. switching, and other sources. These surges vary widely in wave shape, magnitude. and frequency of occurrence. Laboratory tests cannot duplicate the wide variety of surges met in service. Standard test procedures. however, make it possible to compare the impulse strength of different insulations measured by different laboratories, at different times.
1.1 Scope
This test procedure applies to both switching impulse and lightning impulse tests on cables or cable systems incorporating laminated or extruded insulations. The term 1aininced cable, as used in this procedure. includes high-pressure pipe cable, low-pressure gas-filled cable, self-contained liquid-filled cable, solid- paper cable, and other taped cable designs. A cable system is a cable with one or more accessories attached.
This test procedure is not intended to replace any existing or future standards covering cable or cable accessories, impulse generators, impulse testing, or voltage measurements. It is intended to supplement such standards by indicating specific procedures for a specific type of cable system or cable system component.
This test procedure does not apply to cables or cable systems that utilize gas or gas spacers as the sole insulating medium. This test procedure applies to individual cable accessories only when referenced by the specific accessory standard.
3. Testing equipment
3.1 Impulse generator
The impulse generator should have sufficient capacity to deliver the required wave shape and magnitude to the test sample within the tolerances set.
3.2 Wave shape
A standard 1.2/50 p.s wave shall be used for lightning impulses. When possible, a standard 250/2500 p.s wave shall be used for switching impulses. These waves are defined fully in IEEE Std 4-1995.
3.2.1 Wave shape measurement
A calibrated voltage divider and transient recorder or oscilloscope shall be used to observe and record the impulse wave shape. The wave shape and magnitude shall be determined according to IEEE Std 4-1995. The wave shape shall be determined first at reduced voltage with the test sample connected to the test circuit.