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英国美国Megger AVO 产品总揽
MEGGER AVO变压器测量分析仪器仪表总揽

MTO 210变压器直流电阻测试仪

一、MTO 210变压器直流电阻测试仪主要特点：

• 直接数字读数
• 内置放电电路
• 内置消磁电路
• 双向测试能力（减少测试时间）
• 两独立测试通道
• 带载分接变换器测试操作
• 可升级式硬件
• 含PowerDB lite 软件
  

• 直接数字读数，节省时间，不需平衡。
• 内置放电装置，测试完或导线接错或仪表电源掉电时安全放电。
• 可同时测量变压器高低绕组的直阻。
• 敏感的浪涌探测电路监控断路前分接变换器适当的接触操作，如开路时，仪表迅速关闭。
• 四端桥路提供高精度，不再需要补充导线。
• 电子发生和调节电路迅速克服了高感应，可以很快测量，等测试电流稳定可显示测量结果。
• 宽阻抗范围适合检测各种变压器。
• 轻便，易携带。
• 过温保护具有自动断电和LED显示防止仪器损坏。
• 仪器和附件装在可以运输的箱内。

三、产品应用：

• 验证厂内测试读数；
• 作为定期维修的部分项目；
• 对有载分载开关进行联通检查；
• 协助定位变压器的现在缺陷，如松连接。

变压器欧姆表通常用于以下设备的测试：
1）功率变压器
2）配电变压器
3）仪表变压器
4）辅助控制绕组
5）步进调压器
6）电动机
7）发电机
8）断路器触点
9）各种连接（栓接、焊接、压接等）
    此测试装置也能检查带载分接变换器的适当操作，这包括断路器操作的闭合和接触电阻的测量。

特性和优点仪器规格
输入：120/230 V ±10%, 50/60 Hz, 350 VA
输出：
电流量程：高达10A（d.c.）
开路测试电压：50Vd.c.
量程
阻抗: 1 μΩ 到 2000 Ω
精确度: 读数的±0.25%,全量程的±0.25%
过量程: 可显示
环境
操作: 0 to 50°C
储存:‐40 to +65°C
湿度：90%
显示：两高温，18㎜ 3 1/2液晶数字显示，速率大约每秒三次
仪器尺寸：216 H X 546 W X 330 D mm
仪器重量: 大约14 kg
打印：可以通过可选的4 inch的热敏打印机打印

DESCRIPTION
The MTO210 Transformer Ohmmeter is a line-operated, field-portable instrument designed specifically to measure the dc resistance of all types of magnetic windings safely and accurately. It can test transformers and rotating machine windings and perform low-current resistance measurements on connections, contacts and control circuits.
The dual set of potential inputs measures the resistance of the primary and secondary windings of a single- or three-phase transformer simultaneously. This dual reading, dual injection characteristic, also helps to speed up the measurements when used to test LV windings on large three-phase power transformers.
The Transformer Ohmmeter is extremely useful when testing the windings and contact resistance of tap-changers with “make-before-break” contacts and voltage regulators. This action will check for pitted or misaligned contacts as the instrument will give an indication if either condition occurs.
Users are also protected by the auto-shutdown safety feature. Any inadvertent disconnection of a test lead or loss of power to the instrument will safely discharge the energy stored in the unit under test (UUT).
APPLICATIONS
The MTO210 Transformer Ohmmeter is used:
Ÿ To verify factory test readings.
Ÿ As part of a regular maintenance program.
Ÿ To help locate the presence of defects in transformers, such as loose connections.
Ÿ To check the “make-before-break” operation of on-load tap-changers.
A regular maintenance program that includes winding resistance measurements is the most effective way to use this instrument. Once a benchmark is established, subsequent test results can be compared to determine if changes are occurring in the transformers and associated control wiring, voltage regulators, motors, generators, breaker contacts, and all types of connections (bolted, soldered, crimped, etc.).
Tap-changers are mechanical devices and the most vulnerable part of a transformer. Tap-changers result in more failures and outages than any other component and so require frequent testing and attention to ensure reliable and safe operation.
FEATURES AND BENEFITS
Ÿ Direct 2-channel digital reading allows for testing two windings at a time.
Ÿ Very fast discharge time.
Ÿ High-contrast, large alphanumeric displays can be seen in bright sunlight.
Ÿ User-selectable maximum current range ensures protection of small transformers.
Ÿ Beacon drive circuit is provided for use with optional beacon strobe light.
Ÿ Built-in demagnetization circuitry allows the operator to de-magnetize the transformer core upon completion of resistance testing, or as a stand-alone feature before SFRA testing or when the transformer is put back in service.
Ÿ The MTO210 allows for test of transformers with on-load tap-changers and provides a “break-before-make” indicator, in the event of any discontinuity.
Ÿ For those users who choose to create an external interlock safety perimeter, a safety interlock circuit is provided.
Ÿ Remote trigger switch is also provided for testing transformers with tap-changers.
Ÿ Internal flash memory allows for mass storage of dataset records, for later recall, printing, and analysis.
Ÿ Ruggedized clamps, with 4 inch (100 mm) jaws, are provided eliminating the need for bushing adapters.
Ÿ Kelvin clamps/cables (optional) for easy connection to the transformer
Ÿ Compatible with Power DB software package.
Ÿ Built-in discharge circuit safely discharges the specimen when test is completed, if lead accidentally disconnects, or if power is lost.
Ÿ Output RS232 serial port is provided for optional printing of results and/or data analysis on a PC.
Ÿ Detachable lid for ease of use.
Ÿ Unit can be operated while in transit case.
Ÿ Leads can stay connected while in transit case.