The HASB-219-5KVA/360V/150HZ induced voltage withstand test device is designed to meet the requirements of
The induced voltage withstand 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 is an important item to verify whether the winding meets requirements. In order to increase the test voltage of the winding without causing the transformer or instrument transformer core to over-saturate and lead to excessive excitation current, the test frequency must 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). 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 core is not saturated, the main flux it produces is necessarily a flat-topped wave. Since the flat-topped main flux contains a relatively large component of third harmonic magnetic energy Φ3, and the third harmonic flux frequency f3 = 3f1, the main flux induces a third harmonic phase electromotive force.
Since 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 component, it also contains higher harmonics. Among the higher harmonics, the amplitude of I is relatively large. Because the secondary side is open, the three-phase fundamental components cancel each other out, leaving only the third harmonic output.
The entire device achieves voltage output by tuning to resonance under a 150Hz power supply. When the voltage rises, 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 acceptable
3. Product Completeness
1. HASB-219 induced voltage withstand test device 1 unit
2. HASB-219 induced voltage withstand 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 voltage withstand test device
