Transformer Lightning Impulse Test
Lightning-impulse testing for transformer insulation verification using the specified wave shape, polarity, voltage sequence, and acceptance method.
Impulse testing requires an approved connection, calibrated divider and recording system, atmospheric correction where applicable, chopped or full-wave sequence as specified, and comparison of voltage and current oscillograms. The insulation level and terminal under test must match the approved design.
Test scope and acceptance basis
Lightning-impulse testing for transformer insulation verification using the specified wave shape, polarity, voltage sequence, and acceptance method.
Impulse testing requires an approved connection, calibrated divider and recording system, atmospheric correction where applicable, chopped or full-wave sequence as specified, and comparison of voltage and current oscillograms. The insulation level and terminal under test must match the approved design.
Wave tolerances, correction method, oscillogram comparison, external flashover rules, witness, and report.
Products Supported by Transformer Lightning Impulse Test
The test scope and quality files must match the actual product, rated data, applicable standard, and confirmed order specification.
How the work is controlled
Confirm terminals, insulation level, polarity, wave sequence, connection, earthing, chopping arrangement, and acceptance criteria.
Check generator, divider, measuring system, lead arrangement, atmospheric conditions, and reduced-level reference shots.
Apply the specified full and, where required, chopped impulses while recording voltage and current oscillograms.
Review peak, front and tail times, corrections, oscillogram differences, flashover, and other evidence before acceptance.
Project inputs and acceptance basis
| Insulation data | Highest voltage for equipment, specified impulse withstand level, line and neutral terminals, insulation coordination, and clearances. |
|---|---|
| Test sequence | Standard and edition, polarity, full and chopped waves, reduced/full levels, number of applications, and terminal connections. |
| Measurement | Generator, divider, current shunt, recorder, sampling, calibration, lead layout, and atmospheric data. |
| Acceptance | Wave tolerances, correction method, oscillogram comparison, external flashover rules, witness, and report. |
Available project records
Technical questions: Transformer Lightning Impulse Test
Does Transformer Lightning Impulse Test apply to every transformer?
Applicability depends on product type, rating, applicable standard, and the order specification. Routine tests normally apply to each unit; type or special tests are confirmed by project.
What is the acceptance basis for Transformer Lightning Impulse Test?
Acceptance should use the approved data sheet, applicable standard and edition, guaranteed values, tolerances, agreed deviations, procedure, and order requirements.
What should be confirmed before the work starts?
Highest voltage for equipment, specified impulse withstand level, line and neutral terminals, insulation coordination, and clearances.
What test or quality records can be produced?
Approved impulse-test procedure, Test circuit and terminal connection, Atmospheric and correction data, Voltage/current oscillograms, Wave-shape and peak-value evaluation, Signed acceptance report
Discuss your transformer project
Send the available specification, drawing, single-line diagram, test requirement, quantity, destination, and target schedule. We will confirm the applicable equipment and document scope.