The 0kVA power frequency withstand voltage test equipment is an AC high-voltage generating device with an output capacity of 10 kilovolt-amperes (kVA) and a frequency of 50Hz (or 60Hz).
I. Core Applications
This device is used to conduct withstand voltage strength tests on the main insulation of electrical equipment such as power transformers, high-voltage switch cabinets, cables, insulators, and motors, to verify whether the equipment can withstand overvoltages during operation. It is a crucial destructive test item in insulation preventive tests.
II. Test Nature
A power frequency test voltage much higher than the rated working voltage of the equipment (usually several times higher) is applied to the insulation of the equipment for a specified duration (e.g., 1 minute). By observing whether the insulation is punctured or flashover occurs, the insulation performance of the equipment is determined to meet the requirements.
III. Key Parameter Interpretation (Taking “10kVA/100kV” as an Example)
Rated Capacity (10kVA)
The rated capacity determines the maximum apparent power that the device can output and also limits the capacitance of the test sample. For an output voltage of 100kV, the maximum output current can be calculated using the formula: I=S/U
Substituting the data, we get
I = 10000 VA / 100000 V = 0.1 A 。 This indicates that the device can perform full-voltage tests on test samples with a capacitive current not exceeding 0.1A (approximately 3.1nF@50Hz). For large-capacity test samples such as large cables and long overhead lines, this capacity may not be sufficient to meet the test requirements.
Rated output voltage (e.g., 100kV)
Refers to the maximum AC voltage that the device can output at power frequency.
Output voltage waveform distortion rate
High-quality test equipment requires this parameter to be less than 5% to ensure that the test voltage is a sine wave and complies with relevant standards.
Overcurrent protection setting range
Typically 20% to 100% of the rated current, and adjustable, providing protection for the device and the test sample during the test process.
IV. Application Scope
The 10kVA capacity is considered a medium to small-sized test equipment. This characteristic makes it most suitable for performing power frequency withstand voltage tests on equipment with relatively small capacitive loads and medium voltage levels. Its main application scenarios are concentrated in distribution and power consumption equipment at 10kV and below.
Distribution system equipment (core application area)
This is the primary and most typical application scenario for the 10kVA device, commonly used in factory tests, handover acceptance tests, and preventive tests. It can perform withstand voltage tests on the ground and phase-to-phase insulation of busbars, circuit breakers, disconnectors, and transformers in 10kV high-voltage switch cabinets; conduct main insulation withstand voltage tests on newly laid or repaired 10kV power cables (note the length limit, suitable for medium and short-length cables, such as cross-section ≤ 300mm², length ≤ 2km, specific capacitance needs to be calculated); perform external power frequency withstand voltage tests on the windings and bushings of 10kV distribution transformers; conduct withstand voltage tests on the primary windings of 10kV voltage/current transformers (PT/CT); perform power frequency discharge voltage tests on 10kV surge arresters (note the test method); and test the dry flashover or wet flashover performance of 10kV insulators, insulating cross-arms, and wall bushings.
Rotating machinery
Suitable for medium and low-voltage motors/generators, such as AC withstand voltage tests on the stator windings of medium and small-sized motors with a rated voltage of 6kV or 10kV, and can also be used for regular insulation checks on auxiliary motors in power plants/factories.
Other electrical equipment and materials
It can be used to test high-voltage electrical components (such as load switches, fuses, insulated operating rods, etc.); in laboratory settings, it can conduct power frequency breakdown voltage tests on insulating material samples such as insulating boards and bushings; and perform periodic withstand voltage tests on safety tools such as insulating boots and gloves (a dedicated test electrode water tank is required).
V. Typical User Units
Medium and small-sized power equipment manufacturing plants, county and city power supply companies and distribution operation and maintenance zones, power or equipment maintenance departments of factories and enterprises (such as petrochemical, steel, and cement industries), power engineering installation companies, third-party testing institutions, and electrical laboratories of universities and research institutes.
Post time: Jan-06-2026