全自動變壓器消磁器

描述

DEM60R是專為變壓器去磁設計的三相全自動測試裝置。變壓器磁芯去磁需要施加幅值減小到零的交流電。DEM60R通過內部改變受控直流電流的極性來提供這種交流電。在去磁過程中，儀器按照專有軟體的標準程序，每一步都以遞減的幅度提供電流。DEM60R基於最先進的科技，採用當今最先進的技術。該測試裝置可用於單相和三相變壓器的去磁。
對於三相操作，儀器連接至待去磁變壓器的所有三相。如果為不同類型的變壓器選擇了特定的矢量圖，DEM60R將為每種類型的變壓器執行特定的去磁程序（即single phase、delta, wye/star, zig-zag），而無需切換測試連接電纜。

應用時機

當懷疑剩磁或當有不同的測試結果，例如頻率響應分析或磁化/激磁電流，顯示可能留有剩磁時，可使用DEM60R執行完全自動的消磁。

優點和特點

消除剩磁產生的問題

當設備在進行直流電流測試後，如繞組電阻測量，電力變壓器或變比器的磁芯可能會被磁化（剩磁）。此外，當將變壓器從服務中斷開時，鐵芯中可能存在一定量的磁通量。
剩磁所導致的各種問題，例如錯誤診斷、變壓器測量不準確、電力變壓器啟動時的高湧入電流，保護電驛的錯誤操作等。為了消除這一潛在問題的來源，應該進行去磁處理。

V-TR 軟體

標準配備DV-TR軟體，在消磁過程中，可使電流波形及數值顯示在軟體所產生的圖形上。
即時的消磁電流圖形顯示，讓使用者能監視變壓器鐵芯的消磁過程。
當消磁過程結束，可儲存所產生的圖形。
提供測試後就每個步驟的電流波形、數值及過程持續時間的消磁過程分析。

電源

• 連接:根據IEC/EN60320-1; UL498, CSA 22.2
• 電源供應:90-264VAC
• 頻率:50/60 Hz
• 輸入功率:2250VA
• 保險絲：15 A / 250 V，type F，但不是用戶可更換的。

輸出數據

• 測試電流 5 mA – 60 A DC

顯示

• LCD 屏幕 :20 個字符， 4 行
• 帶背光的 LCD 顯示屏

界面

• USB（標準）
• RS232（可選）

尺寸及重量

• 尺寸（寬 x 高 x 深）： 480 x 190 x 385 mm
• 重量： 13.1 公斤

操作環境

• 工作溫度：20 ºC – + 55 ºC
• 儲存條件： -40 ºC – + 70 ºC
• 濕度：5 % – 95 % 相對濕度，非冷凝

適用標準

• 安裝/過壓類別：II
• 污染程度：2
• 安全：LVD 2014/35/EU（符合CE ） 標準 EN 61010-1:2010
• EMC：指令 2014/30/EU（符合CE ） 標準 EN 61326-1:2013

Description

DEM60R is a three-phase, fully automatic test set specially designed for transformer demagnetization. Transformer magnetic core demagnetization requires alternating current applied with magnitude decreasing to zero. DEM60R provides this alternating current by internally changing the polarity of a controlled DC current. During the demagnetization process the instrument supplies the current at decreasing magnitude for each step, following a proprietary software solution. DEM60R is based on a state-of-the-art technology, using the most advanced technique available today. The test set can be used to demagnetize single-phase and three-phase transformers.
For a three-phase operation, the instrument is connected to all the three phases of a transformer to be demagnetized. If specific vector diagrams are selected for different types of transformers, DEM60R will run a specific demagnetization procedure for each transformer type (i.e., single phase, delta, wye/star, zig-zag.) without a need to switch the test hookup cables.

Application

When suspecting remanent magnetism, or when various test results, like FRA or magnetization/excitation current, show possible remanence, DEM60R can be used to perform fully automatic demagnetization.

Benefits and Features

Eliminating Problems Created by Remanent Magnetism
After a DC current test, such as a winding resistance measurement, the magnetic core of a power or instrument transformer may be magnetized (remanent magnetism). Also, when disconnecting a transformer from service, some amount of magnetic flux trapped in the core could be present. The remanent magnetism can cause various problems such as erroneous diagnostics, inaccurate measurements on a transformer, an inrush current at a start-up of power transformer, or an incorrect operation of protective relays due to magnetized CT cores. To eliminate this source of potential problems, demagnetization should be performed.

DV-TR Software
The DV-TR software is included in the purchase price, and all its regular updates are free of charge. The software allows full control of DEM60R functions from a PC, is capable of plotting demagnetization current graph in a real time and provides results of remanent magnetism. The graphical display of demagnetizing current enables monitoring the transformer core demagnetization process. The generated graph can be saved on a computer. This option provides easy after-the-test analysis of the demagnetization process, in terms of current waveforms and values for each step, along with the duration of the complete process.
 

Mains Power Supply

• Connection: according to IEC/EN60320-1; UL498, CSA 22.2
• Mains supply: 90 – 264 V AC
• Frequency: 50/60 Hz
• Input power: 2250 VA
• Fuse: 15 A / 250 V, type F, but not user replaceable

Output Data

• Test current 5 mA – 60 A DC

Display

• LCD screen 20 characters by 4 lines
• LCD display with backlight, visible in bright sunlight

Interface

• USB (standard)
• RS232 (optional)

Dimensions and Weight

• Dimensions (W x H x D): 480 x 190 x 385 mm 18.9 x 7.48 x 15.16 in
• Weight: 13.1 kg / 28.8 lbs

Environmental Conditions

• Operating temperature: -20 ºC – + 55 ºC / -4 ºF – +131 ºF
• Storage & transportation: -40 ºC – + 70ºC / -40 ºF – +158 ºF
• Humidity: 5 % – 95 % relative humidity, non-condensing

Applicable Standards

• Installation/Overvoltage category: II
• Pollution degree: 2
• Safety: LVD 2014/35/EU (CE Conform) Standard EN 61010-1:2010
• EMC: Directive 2014/30/EU (CE Conform) Standard EN 61326-1:2013