آزمايشگاه سيستم كنترل مانيتورينگ DCS

عنوان مقاله: آزمايشگاه سيستم كنترل مانيتورينگ DCS پست‌

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The Art & Science Of Protective Relaying

WHAT IS PROTECTIVE RELAYING

We usually think of an electric power system in terms of its more impressive partsÐthe big generating stations, transformers, high-voltage lines, etc. While these are some of the basic elements, there are many other necessary and fascinating components Protective relaying is one of these

The role of protective relaying in electric-power-system design and operation is explained by a brief examination of the over-all background. There are three aspects of a power system that will serve the purposes of this examination. These aspects are as follows:

A. Normal operation

B. Prevention of electrical failure.

 C. Mitigation of the effects of electrical failur

 

 

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ELECTRICAL EQUIPMENT HANDBOOK

ELECTRICAL EQUIPMENT HANDBOOK

INTRODUCTION

Electric power is generated most economically at 14 to 25 kV. System loads such as motors, lights, etc., require a voltage source of 440, 220, and 110 V. Transformers are needed to change the voltage level. They are also used for these reason

 To reduce transmission losses between power plants and the load by stepping up the voltage. (When the voltage is stepped up, the current will be stepped down. This results  reduction of transmission losses which are proportional to the square of the current.) Reduction in the diameter of the transmission line (amount of copper or aluminum) due to a reduction in the current flowing in the line. Typical transmission voltages are 13.2, 22, 66, 230, 345, and 500 kV. In general, the longer the distance, the higher the voltage used

 

 

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