IEEE 82-2002 pdf download IEEE Standard Test Procedure for Impulse Voltage Tests on Insulated Conductors
1.Overview
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 cannotduplicate the wide variety of surges met in service. Standard test procedures, however, make it possible tocompare 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 systemsincorporating laminated or extruded insulations. The term laminated 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 acces-sories, impulse generators, impulse testing, or voltage measurements. It is intended to supplement such stan-dards 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 insu-lating medium. This test procedure applies to individual cable accessories only when referenced by the specific accessory standard.
1.2 Purpose
This test procedure is intended as a guide for impulse testing of insulated conductors (cables) and cableswith accessories installed (cable systems) It can be used as a design or qualification test for cables or cable
systems.
2.References
This standard shall be used in conjunction with the following standard. When the following standard issuperseded by an approved revision, the revision shall apply.
IEEE Std 4TM_1995EEE Standard Techniques for High-Voltage Testing.1.2
3. Testing equipment
3.1 Impulse generator
The impulse generator should have suflicient capacity to deliver the required wave shape and magnitude tothe test sample within the tolerances set.
3.2 Wave shape
A standard 1.2/50 us wave shall be used for lightning impulses. When possible, a standard 250/2500 uSwave shall be used for switching impulses. These waves are defined fully in IEEE Std 4-1995.
3.21 Wave shape measurement
A calibrated voltage divider and transient recorder or oscilloscope shall be used to observe and record theimpulse wave shape. The wave shape and magnitude shall be determined according to IEEE Std 4-1995. Thewave shape shall be determined first at reduced voltage with the test sample connected to the test circuit.
3.2.2 Lightning wave shape tolerance
A wave within the following tolerances shall be used for lightning impulses:
Wave front time: 1.2 + 0.36 usa
bWave time to half-value: 50+ 10 us
cWave peak value: + 3% of required magnitude
When test circuit constraints or a large capacitance of the test sample make it impractical to meet the light-ning impulse wave specifications above, a wave front time of up to 5 us may be used with mutual agreementof the parties involved.
IEEE 82-2002 pdf download
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