Merel AOS-125

Merel AOS-125

Apparatus for oxidation of insulating liquids

merel instruments

Merel AOS-125

merel instruments

Change the way you look at measurement of fluid aging.

We have designed an apparatus which suits your needs. A clean, minimalistic design with the minimal number of components results in simplicity of use and looks the part too!

Oxidation Stability Procedure

Why is it important?

Because of its properties and price, mineral oil is the most commonly used oil in power transformers. Downside is that during operation, it is subjected to thermal and electrical stress in an oxidizing athmosphere, which causes deterioration of its insulating properties. With time, acidity increases and causes mud formation.

Oil aging analysis helps determine the ‘age’ of the oil. More precisely, it means that we are able to predict when the oil needs to be changed. This results in more efficient use of oil throughout its full lifespan and prevents potential damage to the transformer due to aged oil.

Oxidation Stability Procedure

How can we make it simpler?

With this method it is important to sustain a consistent temperature and flow of oxygen during the entire test, otherwise the results may be inaccurate. The problem with these tests is that they are long lasting. For better control over the entire test period we have developed a ground breaking user interface with data logging and plotting of all parameters.

We are not only able to see real time oxygen/air flows and temperatures but store and process them for future analysis as well. We are aware of the importance and seriousness of your work, which is why we are striving towards making your work as fluent and simple as possible.

Overview

Apparatus

Apparatus has a unique design in its class. With its outstanding user interface it will change the way you look at measurement of fluid aging. The single module consists of a rigid aluminum frame enclosed by matte finish polymer sides. It hosts a dry bath for oil ageing analysis with 6 glassware positions. Temperature and air flow is kept regulated with extreme stability and reliability. We have used a dry bath method which keeps the procedure clean, doesn’t produce toxic fumes and reduces cleaning time of glassware. Apparatus has a separate sample holder, which can be easily detached for further analysis.

Its modular design enables you to move it around with ease and allows you to stack together multiple modules if necessary. The single module can operate as an independent device or multiple modules can be connected together and operate as a single device for larger sample quantities. They can be monitored via only one user interface. Our system offers a low-cost solution for analysis of samples and makes simple upgrading to a larger system possible.

Usage

According to standards and more

Apparatus for oxidation of insulating liquids has been build according to IEC 61125 (old IEC 1125) standard and normative which ensures reliability of measurement. You can choose among method A (100°C) and method B (120°C) for aging evaluation.

Method A is related to unused uninhibited mineral insulating oils, while method B is related to unused inhibited mineral insulating oils, both methods use oxygen gas. For advanced users it is possible to create custom methods, where start time, duration, temperature of block and each individual flow through oil sample can be set. Each module is able to perform different methods (A, B or custom) simultaneously.

Method A
Method B
Sludge formation
Soluble acidity, SA
Volatile acidity, VA
Total acidity, TA or Neutralization Value
Oxidation rate
Dielectric dissipation factor, DDF or Tan Delta

Key attributes

System Functionality
Overview

Technical information

Specifications

Electrical specification - module
  • Required supply
    100 V - 240 V AC (+/-10 %)
  • Frequency
    50-60 Hz
  • Consumption [max]
    1100 W
  • Current
    4,5 A
  • Overvoltage category
    II
  • Heat-up time
    < 2 h
Environmental conditions
  • Ambient temperature
    5…40°C (20…25°C is recommended)
  • Humidity
    15…80 % r.h. (non-condensing)
  • Pollution degree
    2
Dimensions
  • Dimensions - module (WxHxD)
    375 x 235 x 500 mm
  • Weight - module
    36 kg
  • Dimensions – rack (WxHxD)
    375 x 235 x 150 mm
  • Weight - rack
    5 kg
Computer and OS requirements
  • Operating system
    MS Windows 7 Pro (32/64-bit) or MS Windows 8 Pro (32/64-bit) or MS Windows 10 Pro (32/64-bit)
  • Processor
    minimum Intel® Core TM i3
  • RAM
    minimum 2 GB (4 GB is recommended)
  • Hard disk
    8 GB of available hard-disk space for installation
  • Expansion slots
    PCI expansion card slot for RS485 (optional)

Merel AOS-125

Change the way you look at measurement of fluid aging.

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