Wednesday, December 23, 2015

Medium and High Voltage Circuit Breaker Testing

medium voltage circuit breakers

Circuit breakers are automatic switches that interrupt the flow of current in the event of an overload or a short circuit. Whereas a fuse interrupts current flow just once, a circuit breaker is designed to be reset and used again. Circuit breakers can be reset manually or automatically. Available in a wide range of sizes, from household use all the way up to high voltage breakers which are used in power transmission for cities and municipalities. This post focuses on medium-voltage and high-voltage breakers.

Medium-voltage breakers are generally rated between 1 to 72 kV, use current sensing protective relays with current transformers for operation, and use air, oil, SF6, or vacuum as the arc extinguishing medium.

High-voltage circuit breakers are, generally speaking, anything above 72.5 kV. High-voltage circuit breakers are mostly operated via solenoids and protective relays with current transformers.

The video below (courtesy of OMICRON) provides an excellent description of the design, operation, and testing of medium and high voltage circuit breakers.


Monday, December 14, 2015

Tunable Diode Laser Spectrometer - The Yokogawa TDLS8000

TDLS8000
Yokogawa Tunable Laser Diode
Spectrometer TDLS8000
This new product can quickly make in-situ measurements of gas concentrations in combustion and heating processes that are employed in the oil, petrochemical, electric power, iron and steel, and other industries.

Companies are always looking for ways to optimize processes by saving energy, reducing CO2 emissions, and improving safety and one way to do this is by optimizing the air-fuel ratio in the combustion process. To accomplish this, sensors are needed that can continuously monitor the concentration of O2 and CO+CH4 in the radiant section of fired heaters.

Product Features
  1. Highly reliable measurement - The TDLS8000's laser module includes a newly developed reference cell board that improves the reliability of absorption peak detection, which is an important step in the spectral area method. In addition, the receiving unit employs a new auto gain function that can automatically optimize detection sensitivity depending on the measurement object. By increasing the signal-to-noise ratio (S/N ratio), this improves the reliability of measurements taken in coal combustion and other processes where there is high particulate loading. Designed to meet the requirements for SIL2 certification (certification pending) defined by the International Electrotechnical Commission (IEC), the TDLS8000 will play a key support role in ensuring the safe operation of plants.
  2. Improved operability and maintenance efficiency - The TDLS8000 comes with a large 7.5-inch LCD touch screen that can display a greater variety of data. The touch screen replaces the push button interface used with preceding models, making the setting of parameters easier and more intuitive. The light source module containing the laser diode is fully sealed and damage resistant. To facilitate troubleshooting and reduce downtime, this module is able to store up to 50 days' worth of raw data that can be accessed anywhere in the world by, for example, a Yokogawa response center.
  3. Compact size - The redesigned TDLS8000 is just three-quarters the size and weight of the preceding model, allowing it to be installed in a greater variety of locations.

Welcome to the Arjay Automation Blog

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Our expertise in process control, flowmeter selection, analytical instrumentation, electrical watt hour metering, protective relaying and utility test equipment areas, and we will focus there.

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