10KVA/400V Induced Withstand Voltage Test Device

10KVA/400V Induced Withstand Voltage Test Device - Yangzhou DARUI Co., Ltd.

Published: 2020-08-15 09:54:32

Category: Triple Frequency Generator

Product Description

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The triple frequency power generator, triple frequency voltage generator, and triple frequency high voltage generator are designed to meet the requirements of <>, <> and >—1995 for triple frequency induced withstand voltage tests and partial discharge tests.

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 windings meet requirements. In order to increase the test voltage of the windings without causing over-saturation of the transformer or instrument transformer core leading to excessive excitation current, the test frequency should be increased, generally to 100Hz—400Hz.

There are multiple methods to obtain 100Hz—400Hz power, among which the most applicable are:

① Combination of three variable frequency generators (100Hz—400Hz);

② Combination of three single-phase transformers (150Hz), and the most convenient is still the second method

Combination method of three single-phase transformers: the primary side is star-connected, and the secondary side is open delta. When the core is not saturated, the main flux it produces must be a flat-topped wave. Since the flat-topped main flux contains a 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 presents 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, the three-phase fundamental components cancel each other out, leaving only the third harmonic output.

The entire machine's voltage output is achieved by tuning to produce resonance under 150Hz power supply. When the voltage rises, a certain squealing sound from resonance is normal.

Technical Parameters

Rated Capacity: 5-100kVA

Input: Three-phase 380V, 50Hz sine wave

Output: 0-300V, 0-500V, 0-1000V (custom voltage available), 150Hz,

Waveform Distortion: ≤1%

Capacity: 3-150kVA

No-load Operation Time: ≤5 minutes

Load Operation Time: 40-60 seconds

Note: The above information and technical parameters are compiled and released by Yangzhou DARUI Electric Co., Ltd.

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Product Details

10KVA/400V Induced Withstand Voltage Test Device - Yangzhou DARUI Co., Ltd.

10KVA/400V Induced Withstand Voltage Test Device