Overview of Triple Frequency Complete Test Device: This product is a lightweight testing device that utilizes the saturation characteristics of the magnetization curve of silicon steel sheets in the power frequency grid, inducing a zero-sequence third harmonic potential in the secondary coil of a transformer connected in an open delta configuration.
It can be provided as a complete set including control equipment and chassis. This generator is one of the basic devices 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 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, fully capable of replacing traditional frequency conversion units in high-voltage systems.
Working Principle:
For the model 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 supply 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 coils.
Triple frequency complete withstand voltage test device model specifications: The 150 Hz (triple 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 only about 20%. Therefore, a reactor can be connected to an 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)
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Dimensions
Length×Width×Height
(mm)
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Weight
(kg)
|
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Voltage
(V)
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Current
(A)
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Frequency
HZ
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Connection
|
Voltage
(V)
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Current
(A)
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Frequency
HZ
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Connection
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Inductance
(mH)
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Maximum
Current
(A)
|
|
10
|
380±
10%
|
20A
|
50
|
Y
|
500±
10%
|
30
|
150
|
△
|
0.5
|
3~20
|
59~
60
|
60
|
Control box 500x440×700
|
45
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Operating Instructions:
5.1 Connect the working circuit according to the schematic. Ensure that the generator housing, control box housing, and common ground wire are properly grounded. Do not arbitrarily connect them to water pipes, as this may endanger personal safety and equipment.
5.2 Set the action values of the overcurrent setting device and the timing alarm according to the current level and withstand voltage time required for the normal induced withstand voltage test of the test object.
5.3 After preparation and checking the circuit for correctness, close the main power switch of the generator. The power indicator light will illuminate.
5.4 Press the start button; the green button indicator light will illuminate. Then, rotate the voltage regulator handle uniformly and slowly in a clockwise direction. The voltage will gradually increase. Closely monitor the voltmeter indication and the condition of the test object until the required test voltage is reached.
5.5 To test the withstand voltage time of the product, set the desired time on the timer. The product will be subjected to the test voltage for the specified duration, after which the main circuit will automatically disconnect. At this point, return the voltage regulator handle to zero, press the stop button, and turn off the main power switch.
