The HASB-219-5KVA/360V/150HZ induced withstand voltage test device is designed to meet the requirements of
The induced withstand voltage test for 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 winding meets requirements. In order to increase the test voltage of the winding without causing over-saturation of the transformer or instrument transformer core and excessive excitation current, the test frequency is usually increased 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.
Combination method of three single-phase transformers: the primary side is star-connected, and the secondary side is open-delta connected. When the iron core is not saturated, the main magnetic flux it produces must be a flat-topped wave. Since the flat-topped main magnetic flux contains a large component of third harmonic magnetic energy Φ3, and the third harmonic magnetic flux frequency f3=3f1, the main magnetic flux induces a third harmonic phase electromotive force.
Since the primary side is star-connected and the secondary side is open-delta connected, the iron 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 entire device outputs a 150Hz power supply, which is tuned to produce resonance. When the voltage increases, a certain squealing sound during resonance is normal.
2. Electrical Parameters of the Product Tuning Power Supply
Input voltage: three-phase 380V 50Hz
Output voltage: 0-500V 150Hz
Waveform: sine wave, distortion less than 1%
Capacity: 5KVA
Load characteristics: resistive, inductive, capacitive all applicable
3. Product Completeness
1. HASB-219 induced withstand voltage test device 1 unit
2. HASB-219 induced withstand voltage test device voltage control box 1 unit
3. Power connection cable (two-core) 1 piece
4. Power connection cable (three-core) 1 piece
Different specifications can be customized according to user requirements!
HASB-219-5KVA/360V/150HZ induced withstand voltage test device
