Interturn impact voltage tester

NegotiableUpdate on 05/12

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

The RZJ-6 interturn impulse voltage tester is a testing instrument that uses pulse waveform comparison method to simulate overvoltage detection of coils or windings using high-voltage impulse waves, and uses an oscilloscope to distinguish the waveform differences between the two windings. It can not only quickly and accurately diagnose various faults such as insulation corona discharge between coils or windings, local or phase to phase short circuits, open circuits, wiring errors, coil balance, etc., but has also been widely used in related industries.

Product Details

Domestic cost-effective and reliable manufacturer of turn to turn impact voltage tester - Shanghai Huyi Electric Technology Co., Ltd

　　I. Overview

RZJ - 6Interturn impulse voltage tester is a testing instrument that uses pulse waveform comparison method to simulate overvoltage detection of coils or windings using high-voltage impulse waves, and uses an oscilloscope to distinguish the waveform differences between the two windings. It can not only quickly and accurately diagnose various faults such as insulation corona discharge between coils or windings, local or phase to phase short circuits, open circuits, wiring errors, coil balance, etc., but has also been widely used in related industries.

The inter turn impulse withstand voltage tester is suitable for detecting the inter turn insulation of windings in various medium-sized high and medium voltage, AC and DC motors; It can also be used for inter turn insulation detection of transformer windings and electrical coil windings. Due to the inconsistent insulation structure and insulation materials of motor and transformer windings, especially the different levels of operator craftsmanship, insulation damage can occur to varying degrees in processes such as winding, wire embedding, wire scraping, joint end shaping, and handling, resulting in various forms of inter turn insulation faults in the windings. Therefore, inter turn insulation is a weak link in motors and transformers.

The basic principle is the symmetrical balance of impedance. The shock wave comparison method is used to conduct non-destructive simulation tests on the equivalent overvoltage of motor and transformer windings using high-frequency and high-voltage pulses. The oscilloscope of the instrument itself is used to observe the waveform for comparative analysis, which can intuitively, quickly and correctly test winding turn to turn short circuits and various impedance imbalance faults.

　　2、 Noun Explanation

1. Reference motor (coil):

Any motor (coil) can be selected and compared with multiple tested motors (coils) of the same specification. If the waveforms displayed on the screen coincide, the motor (coil) can be used as a reference motor (coil);

2. Tested motor (coil):

-Motors (coils) without knowing whether there is inter turn insulation problem in the coil before testing;

-Motor (coil) connection: Connect the red high-voltage output line and the black high-voltage output line to the reference motor (coil) first, store the waveform, and then compare it with the waveform of the measured coil;

3. Fault identification:

-When the oscilloscope display screen shows that the waveform of the tested coil does not coincide or shakes with the reference coil, it indicates that there is a fault in the tested coil (waveform discrimination can be seen in the discrimination diagram). Generally, the test of a set of motors (coils) can be completed in only 2-3 seconds:

-Common faults in inter turn impulse withstand voltage testing (see fault discrimination diagram on the last page):

-Interturn short circuit, inter turn open circuit, coil corona discharge, local short circuit, wiring error, coil balance, etc;

　　3、 Technical indicators

-Input voltage: 220V+5%; Frequency 50Hz/60Hz+2%

-Test range: Continuous adjustable within 500~5kV range: ± 5%

-Trigger frequency (repetition rate): 25 times/second

-Wavefront time: 0.5-1.2 μ s (standard specification)

-The tolerance is: (+0.3)/(-0.1) μ s

-Power consumption: 300VA

-Insulation resistance: The insulation resistance of the power input terminal to the rack is ≥ 20M Ω;

-Dielectric strength: The power input terminal can withstand 1500V/50Hz for 1 minute with no flying fox or breakdown phenomenon in the withstand voltage test on the rack

-Environmental temperature: 0~40 degrees;

-Relative humidity: ≤ 80% at 40 degrees Celsius; Waveform tolerance: ± 3%

-Dimensions: 520x460x280mm

-Weight: 30kg

-Style: Desktop

　　4、 Working principle

The power supply is boosted by a voltage regulator and transformer, rectified by a high-voltage rectifier tube, and charged to the peak value of the pulse capacitor. The discharge switch is triggered synchronously with the power supply to discharge the energy stored in the pulse capacitor to the load coil through a current limiting resistor, forming an attenuated oscillation wave. When a direct solid short circuit fault occurs in the coil, a short-circuit turn will be formed, which will significantly change the inductance of the coil. For weak insulation points between turns that still have a certain degree of insulation, the winding inductance will not change until the breakdown voltage is reached. Only when the test voltage exceeds the withstand value of the weak insulation point, will it cause inter turn insulation, spark discharge, accompanied by discharge sound. At the same time, the coil inductance L will decrease, and the attenuated oscillation frequency will increase. The attenuated waveform signal will be sampled by a pulse divider and displayed by an oscilloscope. Adjusting the input voltage of the voltage regulator can change the magnitude of the peak impulse voltage, which is displayed on the peak voltage meter.