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- Automotive＆EV
- ECG KOKUSAI DWIT-05
ECG KOKUSAI New Impulse Winding Tester DWIT-05
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The DWIT series from ECG KOKUSAI builds on the DWX series' legacy, providing precise impulse winding testers with enhanced performance and reliability. It boasts high accuracy and diverse functions, including improved operability and comprehensive communication interfaces. These testers efficiently assess winding quality through nondestructive tests, detecting defects and evaluating degradation over time. The system stores 1000 test results, assisting in consistent quality control.
Features
12bit resolution x 300MHz sampling
High resolution and high speed sampling ADC circuitry enables acquisition of higher resolution waveforms.
Memory of up to 16384 points ensures that waveform disturbances and partial discharge noise are supplemented, and waveforms can be enlarged and displayed after testing.
A cursor allows confirmation of waveform rise time, pulse width, and peak voltage.
Visualization of inspection process by database management
Master waveform, Determination conditions, Test results( Save the test waveform and the judgment value ) in the built-in database.
You can browse remotely from a computer using SQL client software.
In addition, test results can be searched by pass or fail, by date and time, which is useful for analysis such as NG generation rate.
Abundant Additional Options
PD (Partial Discharge) detection antenna / 3ch+GND built-in switching circuit / 4-terminal measurement circuit / Additional applied energy / Current measurement, and many other additional functions are available. (*Some functions cannot be installed at the same time.)
Pleasant Functions
10.1-inch color TFT LCD touch panel for improved operability
External memory (USB, SD) storage of screen shots
Creation of master waveforms by [Averaging / Composite / Test Waveforms
Overview
The impulse winding tester efficiently and nondestructively performs electrical tests on test objects in their wound state.
The principle of the test is to apply an impulse voltage to a reference winding (master coil) and a winding under test (test object), and compare the transient waveforms to determine whether the test is acceptable or not.
The transient waveforms, i.e., the damped vibration waveforms that occur in the coil, are the inductance and Q values, and the number of coil turns, layer shorts, and core material differences can be determined at the same time.
Furthermore, by applying a high impulse voltage, insulation defects can be detected from the occurrence of corona discharge.
In other words, most of the characteristics required for winding quality can be tested in a very short time.
New mode of DWIT-05
Aging Test (Continuous Printing) Mode
The DWIT-05 is equipped with a function that allows continuous application of impulse voltage for an arbitrary time or number of times.
This mode is used to evaluate the degradation of samples caused by the continuous application of impulse voltage for a long period of time.
By adding an optional PD sensor, the time (number of times) until discharge occurs can be observed.
Test Result Mode
Test result values are stored in the main unit's memory.
In addition, the number of times the test item was judged as OK, NG, or NG is displayed in graphs and numerical values.
In addition, the test screens of the past 1000 impulse tests can be saved and reviewed.
Existing determination items
More detailed measurement with improved resolution, sampling frequency, and number of samples
Break Down Voltage Test
BDV test mode, which automatically boosts the applied voltage to find the breakdown voltage, is included as a standard feature.
New test items added!
Introducing a new indicator of the characteristics of the test object, measurement of actual values
1.Frequency judgment
Judgment by resonance frequency
The frequency is calculated from the average of the measured cycles of self-resonant waveforms.
The frequency change is indicated by changes in the impedance and capacitor components of the test object, or by losses.
2.Logarithmic decrement judgment
Judgment by logarithmic attenuation rate
The amplitude of the self-resonant waveform is measured, and the logarithmic decrement is calculated from its average.
The waveform attenuation varies depending on the change in inductance and capacitance of the test object or loss.
3.Peak stability judgment
Judgment by peak voltage V of resonance waveform
The amplitude strength is measured from the peak voltage value of the self-resonant waveform.
The peak voltage varies due to distortion of the waveform and disturbances caused by discharge, and thus the loss caused in the test object is indicated.
Specifications
| Applied voltage ・ Energy | 100-5000V・0.12J | |
| Voltage accuracy | ±5.0% | |
| Applied step | 1V | |
| Inductance range | 5μ-1H | |
| Resolution / Sampling speed | 12bit / Max. 300MHz (20 steps) | |
| Sampling data | 16384 , 8192 , 4096 , 2048 , 1024 , 512 | |
| Screen display | 10.1” color TFT LCD (1280 x 800 (WXGA)) Touch panel | |
| Test mode | Impulse Test, BDV（PDIV） Test, Aging Test（NEW） | |
| Judgment Item | Existing judgment | Area (area comparison), Dif-Area (waveform difference comparison), Flutter (discharge volume comparison), Laplacian (discharge volume comparison) |
| New Judgment (NEW) | Pkstb(peak voltage), Freq(resonant frequency), Ldec(logarithmic decay rate) | |
| Partial discharge judgment*Option | – | |
| Safety protection function | Emergency stop button, Interlock | |
| Internal memory | Master waveform 1000 models (100 models/10 pages), test results, voltage waveform (csv), screenshot (png) | |
| External interface | RS-232C (max. 115,200 bps) Control(NPN/PNP transistor (changeover by wiring), D-sub 37pin) Ethernet communication (1000BASE-T), protocol (UDP/IP, TCP/IP) USB2.0 host (max. 3Mbps) Trigger output (impulse voltage applied synchronous signal output) |
|
| External storage | USB memory (2 ports), SD card, SDHC card (max. 32GB) | |
| Operating environment | 0°C to 40°C, 80%RH (no condensation) | |
| Input power supply | AC100 ～ 240V, 50Hz/60Hz | |
| Dimensions ・ Weight | 342(W)×188(H)×366(D) (*Excluding protruding parts *in mm) ・ Approx. 9.8kg | |
| Accessories | Test cable, Power cable (A type, with 3-pin adapter), Fuse, Operation manual, Test report | |
Additional option
| 3ch + GND switching circuit | Built-in test circuit switching for 3-phase coil U, V, W, and GND can be set as desired. Compatible with IEC standard recommended circuit testing. In preparation |
| Partial discharge detection circuit | – |
| 4-terminal test circuit | Separates the voltage application and measurement circuits to more accurately measure the voltage at both ends of the coil. |
| Charging capacitor change | The capacity of the charging capacitor has been doubled, increasing output energy and providing countermeasures for samples that are difficult to apply voltage to. |
| Carry Handle | Used for carrying and placing the instrument face up (not included as standard). (Not included as standard.) |
| Rack Mount | Can be mounted on a 19-inch rack. |
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