AC hipot test set

Data records

• Alternating voltage is the preferred form for substation apparatus testing because most of the tests performed are overvoltage withstand tests, which stress the insulation in the way service voltage does. Source: High Voltage, Inc. application page, web page edition. Verified 2026-10-27. Record instr.ac-hipot-test-set.ac-versus-dc
• AC hipot test sets are used on rotating machines, transformers and instrument transformers, switchgear, cable samples, bushings, capacitors, arresters, connectors, line hardware and insulating materials, and some models are supplied in mobile form for test objects that are hard to bring to a test area. Source: Hipotronics product page, web page edition. Verified 2026-10-27. Record instr.ac-hipot-test-set.applications
• The size of test object an AC hipot test set can energize is limited by its output current, because a capacitive specimen such as a cable length or a winding draws a charging current in proportion to its capacitance; higher-capacitance loads call for sets of higher kilovolt-ampere rating or for resonant sets. Source: High Voltage, Inc. product page, web page edition. Verified 2026-10-27. Record instr.ac-hipot-test-set.capacitive-load
• The output voltage and the current drawn by the test object are read on a voltmeter and an ammeter, and a guard mode routes stray capacitive currents around the ammeter so that the leakage current of the test specimen alone is measured. Source: Phenix Technologies product page, web page edition. Verified 2026-10-27. Record instr.ac-hipot-test-set.leakage-current-readout
• An adjustable overcurrent trip point de-energizes the output when the specimen current exceeds the set level, as it does at breakdown, and a breakdown memory voltmeter holds the voltage at which the trip occurred. Source: Phenix Technologies product page, web page edition. Verified 2026-10-27. Record instr.ac-hipot-test-set.overcurrent-trip
• The instrument class is written AC hipot test set. Value: AC hipot test set. Source: Electrical Testing Reference editorial taxonomy, 2026-10 edition. Verified 2026-10-27. Record instr.ac-hipot-test-set.title
• Portable sets place the control and regulator in one enclosure and the oil-insulated high-voltage transformer in a separate cylindrical housing, and a corona-free shielding electrode on the output keeps the discharge of the set itself low, which matters when the set is the source for partial discharge testing. Source: Phenix Technologies product page, web page edition. Verified 2026-10-27. Record instr.ac-hipot-test-set.variants
• An AC hipot test set applies a power-frequency alternating voltage above the service voltage to the insulation of a test object and holds it for a set time, so that the insulation is shown to withstand the voltage without breakdown. Source: High Voltage, Inc. product page, web page edition. Verified 2026-10-27. Record instr.ac-hipot-test-set.withstand-purpose
• A zero-start interlock prevents the high voltage from being energized unless the voltage control is at its minimum, so that every test begins from zero voltage and the voltage is raised under control. Source: Hipotronics product page, web page edition. Verified 2026-10-27. Record instr.ac-hipot-test-set.zero-start-interlock