IEC 60156:2025 PDF
Insulating liquids - Determination of the breakdown voltage at power frequency - Test method
Insulating liquids - Determination of the breakdown voltage at power frequency - Test method
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 52
- Дата публикации:
- 31 января 2025 г.
- Издание:
- IEC IS 60156 edition 4 version 1
- ICS:
- 29.040
IEC 60156:2025 specifies the method for determining the dielectric breakdown voltage of insulating liquids at power frequency. The test procedure is performed in a specified apparatus, where the oil sample is subjected to an increasing AC electrical field until breakdown occurs. The method applies to all types of insulating liquids of nominal viscosity up to 350 mm2/s at 40 °C. It is appropriate both for acceptance testing on unused liquids at the time of their delivery and for establishing the condition of samples taken in monitoring and maintenance of equipment.
Abstract
Overview
IEC 60156:2025 - Insulating liquids - Determination of the breakdown voltage at power frequency - Test method - specifies a standardized AC test method to determine the dielectric breakdown voltage (power-frequency) of insulating liquids. The procedure defines required apparatus, sample handling, test-cell geometry and electrodes, and test control so results are comparable worldwide. It applies to insulating liquids with nominal viscosity up to 350 mm2/s at 40 °C and is suitable for both acceptance testing of new liquids and condition assessment during equipment monitoring and maintenance.
Key topics and technical requirements
- Scope: Method for measuring breakdown voltage at power frequency (48 Hz to 62 Hz sinusoidal supply).
- Apparatus components: Voltage regulator, step-up (or resonant) transformer, switching system, current‑limiting resistors and measuring system.
- Voltage control: Automatic, uniform rate of rise; voltage increments shall be smooth and without overshoot. Incremental steps should not exceed 2% of the expected breakdown voltage.
- Electrical integrity: Transformer secondary centre-point earthed; AC source free from significant harmonics (
Технические детали
- Технический комитет
- TC 10 - Fluids for electrotechnical applications
- SKU
- IEC 60156:2025
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