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 of a transformer connected in an open delta configuration.
Complete sets of products including control equipment and chassis can be provided. This generator is one of the basic equipment for performing 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 supply and distribution networks. It can also be used for frequency-doubled and voltage-doubled tests on various low-voltage electronic, instrument power transformers, and inductor coils, as well as serving 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, fully capable of replacing traditional frequency conversion units in high-voltage systems.
Working Principle:
For the model and specifications of the triple frequency complete withstand voltage test device, the primary sides of three single-phase transformers are connected in a star configuration, and the secondary sides are connected in an open delta. When a symmetrical three-phase sinusoidal power supply is applied to the primary side and the voltage is raised to saturate the iron core magnetic circuit, the content of third harmonic components in the magnetic flux of the iron core increases, correspondingly increasing the third harmonic voltage induced in the iron core coil.
For the model and specifications of the triple frequency complete withstand voltage test device, 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), its current changes from inductive to capacitive. Due to the low power factor, the efficiency of the generator is relatively low, generally only about 20%. Therefore, a reactor can be connected to a certain idle 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 |
Voltage (V) |
Current (A) |
Frequency Hz |
Connection |
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 |
