Product Details

<sub><sup>Triple Frequency Power Generator



 The induced overvoltage withstand test of transformers and instrument transformers is an important test to verify whether the product meets national standards. The longitudinal insulation induction test of interlayer, inter-turn, segment, and phase-to-phase insulation of windings is an important item to verify whether the windings meet the requirements. In order to increase the test voltage of the winding without causing the core of the transformer or instrument transformer to saturate excessively and lead to excessive excitation current, the test frequency needs to be increased, generally to 100Hz-400Hz. There are various methods to obtain a 100Hz-400Hz power supply, among which the more applicable ones are: ① combination of three variable-frequency generators (100Hz-400Hz); ② combination of three single-phase transformers (150Hz), and the most convenient is the second method. The combination of three single-phase transformers: the primary side is star-connected, and the secondary side is open-delta connected. When the core is not saturated, the main flux it produces must be a flat-topped wave. Since the main flux of the flat-topped waveform contains a large component of the third harmonic magnetic energy Φ3, and the frequency of the third harmonic flux is f3=3f1, the main flux induces a third harmonic phase electromotive force. Because the primary side is star-connected and the secondary side is open-delta connected, the core operates in a saturated state, and the no-load current I is a peaked wave. In addition to the fundamental wave, it also contains higher harmonics. Among the higher harmonics, the amplitude of I is relatively large. Due to the open secondary side, the three-phase fundamental components cancel each other out, leaving only the third harmonic output. The triple frequency power generator utilizes the saturation characteristics of the magnetic circuit to extract the third harmonic voltage, which has the largest component among the harmonics, as the power supply for the generator. It is used for inter-turn, inter-segment, and interlayer frequency multiplication and voltage multiplication tests on inductive coil-type electrical products such as transformers and instrument transformers, to assess the insulation strength and withstand voltage level of the coils.

Technical Parameters:

1. Working power supply: Three-phase AC 380V ±10% 50Hz

2. Rated capacity: 3KVA-30KVA (optional)

3. Input voltage: 380V 50Hz sine wave

4. Output voltage: 250V-1000V 150Hz, waveform distortion ≤5%

5. Output capacity: 3kVA, 5kVA, 10kVA, 20kVA, 50kVA

6. No-load operation time: ≤5 minutes

7. Load operation time: 40-60s</sup></sub>