Product Overview:
This product is a lightweight test device manufactured based on the principle of utilizing the saturation characteristics of the magnetization curve of silicon steel sheet cores in the power frequency grid, inducing zero-sequence third harmonic electromotive force in the secondary coil connected in an open delta configuration of the transformer.
It can be provided as a complete set including control equipment and chassis. This generator is one of the basic devices for conducting frequency-doubled induced high voltage tests on small-capacity power transformers and cascade high-voltage potential transformers in power systems, power plants, substations, and power distribution networks. It can also be used for frequency-doubled and voltage-doubled tests on various low-voltage electronic and instrument power transformers, inductor coils, and electrical appliance coils. Additionally, it can serve as a frequency-doubled power source with a power not exceeding 1 kilowatt for power supply or testing of certain special electrical equipment.
This product is a static frequency conversion device with low noise and small size, which can completely replace traditional frequency conversion units in high-voltage systems.
Working Principle:
For the model and specifications of the triple frequency complete withstand voltage test device, three single-phase transformers have their primary sides connected in a star configuration and secondary sides in an open delta. When a symmetrical three-phase sinusoidal power source is applied to the primary side and the voltage is raised to saturate the iron core magnetic circuit, the third harmonic component in the magnetic flux increases, correspondingly increasing the third harmonic voltage induced in the iron core coil.
The 150 Hz (three times the power frequency) induced voltage output from the secondary side of the open delta generator serves as the triple frequency test power supply voltage.
When the triple frequency generator is loaded (for example, with a JCC——220 type high-voltage cascade potential transformer), the current changes from inductive to capacitive. Due to the low power factor, the generator's efficiency is relatively low, generally around 20%. Therefore, a reactor can be connected to a certain empty winding of the test object for current compensation to improve the power factor of the entire test circuit.
Technical Parameters
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Technical Parameter Table |
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Output Capacity (KVA) |
Transformer Primary Rated Data |
Transformer Secondary Rated Values |
Third Harmonic Ratio |
Compensation Reactor |
Load Test Time (Seconds) |
Dimensions Length×Width×Height (mm) |
Weight (kg) |
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Voltage (V) |
Current (A) |
Frequency HZ |
Connection Method |
Voltage (V) |
Current (A) |
Frequency HZ |
Connection Method |
Inductance (mH) |
Maximum Current (A) |
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10 |
380± 10% |
20A |
50 |
Y |
500± 10% |
30 |
150 |
△ |
0.5 |
3~20 |
59~ 60 |
60 |
Control box 500x440×700 |
45 |
