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Monthly Archive for: «January, 2013»

What is transformer rating based on?

In the U.S., transformers are rated based on the power output they are capable of delivering continuously at a specified rated voltage and frequency under “usual” operating conditions without exceeding… Read more

Jan 30, 2013 | Edvard

What is transformer rating based on?

High Voltage Substations Overview (part 2)

Continued from first part: High Voltage Substations Overview (part 1) Transformers are used for the transformation of high and medium voltage to low voltage, flanked by specific protective devices and… Read more

Jan 26, 2013 | Emmanouil Angeladas

High Voltage Substations Overview (part 2)

High voltage substations overview (part 1)

High voltage substations are interconnection points within the power transmission and distribution systems between regions and countries. Different applications of substations lead to HV substations with and without power transformers: Step… Read more

Jan 25, 2013 | Emmanouil Angeladas

Substations and Distribution Substations Overview

Comparison of Protection Relay Types

This comparison summarize characteristics of all protection relay types described in previously published technical articles: Using Protective Relay For Fighting Against Faults The Good Old Electromechanical Protective Relay The Solid… Read more

Jan 23, 2013 | jiguparmar

Comparison of Protection Relay Types

Power measurement in a three-phase system

Electrical power is measured with a wattmeter. A wattmeter consists of a current coil connected in series with load, while the other potential coil is connected parallel with load. Depending… Read more

Jan 19, 2013 | Edvard

Power Measurement In a Three-Phase System

Underground residential distribution layouts

Where general appearance, economics, congestion, or maintenance conditions make overhead construction inadvisable, underground construction is specified. While overhead lines have been ordinarily considered to be less expensive and easier to… Read more

Jan 18, 2013 | Edvard

Underground residential distribution layouts

D.M.C.R. Protection Relay for Oil Transformer

Introduction to D.M.C.R. Faults detected on live transformer unit: Dielectric fluid level is detected as low Overheating is detected Excess pressure is detected Standards Possibilities of D.M.C.R.: Oil level control… Read more

Jan 16, 2013 | Edvard

DMCR - Detection, Measurement and Control Relay for Hermetically Sealed Oil Transformer

Testing and Commissioning of MV/HV Cables

Compare cable data with drawings and specifications. Inspect exposed sections of cables for physical damage. Inspect bolted electrical connections for high resistance using one or more of the following methods: Use… Read more

Jan 12, 2013 | Edvard

Testing and Commissioning of MV/HV Cables

Environmental Stresses On External Insulation

The external insulation (transmission line or substation) is exposed to electrical, mechanical, and environmental stresses. The applied voltage of an operating power system produces electrical stresses. The weather and the… Read more

Jan 07, 2013 | Edvard

Environmental Stresses On External Insulation

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