ST-3006变压器Winding Deformation Tester-扬州达瑞

ST-3006 Transformer Winding Deformation Tester

Darui Electric recommends

Main Features:

Adopts Windows platform, compatible with Windows 2000/Windows XP.

Can load 2 curves simultaneously, automatically calculate relevant parameters of each curve, automatically diagnose winding deformation, and provide diagnostic reference conclusions.

Powerful software management functions, fully considering field use needs, automatically save environmental condition parameters to provide basis for transformer winding deformation diagnosis. Measurement data automatically saved, with color printing function, convenient for users to generate test reports.

Obvious user-friendly features, most measurement conditions are options, reducing on-site input, making it more convenient for users.

High software intelligence, after connecting input and output signals, only one button is needed to complete all measurement work.

Software interface is simple and intuitive.

Safety Work Guidelines

Before using the transformer winding tester, please read this chapter carefully to familiarize yourself with important safety points and warnings.

Please use this tester in accordance with the instructions in this manual, otherwise the protection provided by the tester may be impaired.

In this manual:

[Warning] refers to situations or operations that pose a risk to the user or the acquisition instrument.

[Caution] refers to situations or operations that may cause damage to the tester or the transformer under test.

[Note] refers to situations or operations that may cause errors in test results.

To avoid personal injury and damage to the tester or transformer under test, please follow the guidelines below:

[Warning] The transformer core must be reliably grounded to the shell. The tester shell and measurement impedance shell must be reliably grounded to the transformer shell.

[Warning] Do not start the winding deformation test until the tester's "ground" is correctly connected.

[Warning] Before testing, fully discharge the transformer terminals.

[Note] Before use, check the appearance of the tester, check whether the power switch is in the "off" position, and whether all terminals are normal.

[Note] Winding deformation testing should be performed after disconnecting all transformer leads (including overhead lines, enclosed busbars, and cables), and keep these leads as far away from the transformer bushings as possible (surrounding grounding bodies and metal floating objects should be at least 20cm away from the transformer bushings), especially for transformers connected to enclosed busbars.

[Note] During testing, correctly record the tap changer position. The tap changer of the transformer under test should be placed at the first tap as much as possible, especially for on-load tap-changing transformers, to obtain comprehensive winding information. For off-load tap-changing transformers, ensure each measurement is at the same tap position for comparison.

[Note] Ensure that the wiring clamp of the measurement impedance is in close contact with the bushing terminal. If there is conductive paste or rust on the bushing terminal, wipe it clean with sandpaper or a dry cotton cloth.

Preparation

Note: Basic operations involving the computer and Windows operating system are not covered in this manual; please refer to relevant computer books.

Note: The basic operations of the Windows operating system in this manual are based on Windows XP; differences between Windows 2000 and Windows XP operations are not covered in this manual; please refer to relevant computer books.

Acquisition Instrument USB Driver Installation

Driver Installation

After connecting the hardware circuit to the computer, if it is the first connection, the computer will prompt that new hardware is found. Insert the driver CD into the computer to install the driver. When the hardware circuit is first connected to the computer, the microcontroller on the card has no program yet, and its default ID is: VID:0x04B4; PID:0x8613. Through this ID, the computer finds the wdgtldr.sys file, which contains the microcontroller program. It transfers the microcontroller program to the microcontroller on the acquisition card in some way and runs it. After that, the microcontroller has a new ID, through which the computer finds the ezusb.sys file. ezusb.sys is provided by Cypress and supports USB data transfer. In the application software, data transfer and control are performed through it. Due to the use of online loading technology in the system design, new hardware may be found twice; follow the prompts to proceed.

System Introduction

The Transformer Winding Deformation Tester (Frequency Response Method) is used to test power transformers of 6kV and above voltage levels and other special-purpose transformers. Power transformers inevitably suffer from various fault short-circuit currents or physical impacts during operation or transportation. Under the strong electromagnetic force generated by short-circuit currents, transformer windings may lose stability, leading to local distortion, bulging, or displacement, which seriously affects the safe operation of the transformer. According to the national power industry standard DL/T911-2004, the frequency response analysis method is used to measure transformer winding deformation. It detects the amplitude-frequency response characteristics of each transformer winding and performs longitudinal or horizontal comparison of the test results. Based on the degree of change in the amplitude-frequency response characteristics, it determines the possible deformation of the transformer winding.

The Transformer Winding Deformation Tester (Frequency Response Method) consists of a measurement part and analysis software. The measurement part is a black box that generates and measures signals. The analysis part is completed by a laptop. The measurement part connects to the laptop via USB or network.

Main technical features of the Transformer Winding Deformation Test System:

Testing can be performed without lifting the transformer cover or disassembling it.

Uses the most popular sweep frequency method for measurement.

This instrument can measure transformers above 6kV.

Adopts a split structure, with USB connection between the test host and the main control computer, plug-and-play.

Simple on-site wiring and easy to use.

Wide measurement dynamic range: -100dB to 20dB.

Powerful analysis software, with software and hardware indicators meeting the national standard DL/T911-2004.

Main technical specifications of the Transformer Winding Deformation Tester (Frequency Response Method):

Test host to PC interface: USB.

Signal source: The instrument has one channel signal output as the sweep excitation signal; the signal output is a standard sine wave, the output amplitude can be adjusted by software, maximum amplitude ±10V, output impedance 50Ω.

Two acquisition channels: one for acquiring the excitation signal, one for acquiring the response signal, used to calculate the transfer function.

Acquisition channel quantization accuracy: 14 bits.

Maximum storage capacity per channel: 64K samples.

Maximum sampling rate per channel: 25Msps.

Acquisition channel input impedance: 1MΩ.

Sweep frequency measurement range: 500Hz - 2000kHz.

Scanning method: Linear distribution sweep frequency measurement.

Sweep frequency accuracy: The frequency accuracy of the sine signal output by the signal source is no more than 0.01%.

Sweep frequency measurement points: Fixed mode or user-defined.

Complies with national power industry standard: DL/T911-2004.

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