Good day and warm Greetings From Zubair!!! We all hope that everything is well! This is to introduce to you our company, Al Zubair General Trading Est. Kindly see below company profile for your reference! Our company (Electrical Division) is Oman based who has its business in diversified activities spread over Oman, United Arab Emirates, Saudi Arabia, Qatar & Nigeria. Establishing our presence here in UAE from 1989, we have been fortunate to associate with major electrical brands like ABB, Hager, L&T, Eaton in LV Switchgear apart from other major cables and lighting products. Being one of the authorized distributors for ABB, our product basket covers complete range of Power, Control and Automation products. Apart from component supplies, we are also “Authorized Value Provider” for
Reliability is one of the most important aspects we should be focused on especially when it comes to Plant Maintenance. Frequent shutdowns in plant could be caused by poor maintenance management and lack of advance tools to keep the system running. For a plant working 24/7, most of the running equipments should be treated critically and monitored regularly. However, Redundant Systems are used to save the plant from shutdowns if failure occurs. Aside from back-up power we should always thought of back-up systems that will manually or automatically take over the operations in the event of fault or alarm. In this article, I will share with you the redundant systems that I have encountered by working in Maintenance Department and Engineering Design.
This article will discuss about the three common Electrical Measurements we can found in Switchgears and Panel boards. I learned this electrical measurements when I worked with a gas manufacturing plant as a Cadet Engineer. However, this is just few of the measurement devices that we have in the field of Electricity. This article will focus on Current Transformer, Potential Transformer and Tore that are used as metering device. Table of contents 1. Current Transformer 2. Potential or Voltage Transformer 3. Tore or Residual Current Sensor Current Transformer The current transformer makes it possible to reduce a high intensity current to a value of 1A or 5A exploitable by the measurement apparatus and the protection relays. (1A and 5A being standardised values). It includes a primary
Introduction Overheating of a motor due to an abnormal use shortens considerably the life time of its components and causes short-cuts. Overloads are tolerated only for a limited period of time. Concerning short-cuts, their effects are destructive and they must be quickly cut off. Fault types Internal Faults That type of internal faults generally appears when insulating components areageing. It is then preferable to release the protection as fast as possible. Those faults can be detected by comparing the ongoing and outgoing currents of the same phase. The protection is then provided by an percentage differential overcurrent relay connected to two sets of three current transformers placed on each input and output phases of the stator. Because of the imprecision linked to the TC, the fault current
20/25 MVA Oil-filled Transformer Transformer is an electrical static machine whose aim is to increase and decrease an Alternative Voltage. Runs on magnetic affect, without any part being in motion. Usefulness of Transformers The transport of electrical energy at high voltage allows to convey less current in the lines (P = 3 V I cos ). For given amount of losses, transportation under limited current, allows to use conductors with lower cross sectional areas, i.e. cheaper! Also structures that can stand these conductors will be less restrictive because a lower cross sectional area also means a reduced weight. That is why it is cheaper to transform the voltage and use intermediate voltages, especially when distances become longer… The transformer also provides a galvanic insulation, i.e.. the primary and
How to properly size a motor circuit breaker? This article will tackle about the sizing of Inverse Time Circuit Breaker with regards to National Electrical Code (NEC). I have learned this not just in school, but also in review center for our national board exam. It's one of the essential topics you should know for future use especially in the design field. What is Circuit Breaker? Circuit Breaker is an over current protective device that can manually switch on/off and automatically trip when a short circuit fault occurs. Why do we need to size a circuit breaker? Circuit Breaker rating is sized according to its load/s. Thus, undersized circuit can always give false alarm to operation. While oversized can lead to equipment breakdown or
Table of contents ONAN Cooling Method What are the types of Transformer Cooling method and their differences? Transformer always have losses thus, generates heat. It should be rectified with proper cooling system to avoid failure. Transformer can be classified in to two types which are Dry-type and Oil-immersed Type. For dry-type transformersAir Natural (AN)Air BlastFor oil-immersed tranformersOil Natural Air Natural (ONAN)Oil Natural Air Forced (ONAF)Oil Forced Air Forced (OFAF)Oil Forced Water Forced (OFWF) Cooling methods for Dry type Transformers Air Natural or Self air cooled transformer This cooling system is generally used in small type transformers upto 3MVA. It is when Transformer is being cooled by air. Example is when a control transformer is inside a control panel or installed in a control room with just