Different types of time delay relays

Introduction Time delay devices are used for delaying the start-up, shutdown, recycling, or continuation of processing operations until the desirable requirements have been satisfied or the required conditions have been obtained.In this session we are gonna discuss about the different types of time delay relays Dashpot or Pneumatic In a “dashpot” type delay, the armature of …

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Time delay relays

Introduction The time delay relays are special purpose relays or logic components that have some characteristics of both relays and Timers Timing is one of the variables of any process, and often needs to be monitored or controlled. Some operatives the steps in a process may need to match or may need to be separated …

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Basics of Motor Control

Introduction The energy distribution systems used in large commercial and industrial applications can be complex. Power can be distributed through switchgear, electrical panels, transformers and boards. Energy distributed through a commercial or industrial application is used for a variety of applications such as heating, cooling, lighting and motor-driven machinery. Unlike other types of power distribution …

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Control Valve guiding

Valve guiding is necessary for proper alignment with the seat ring and efficient control of the process fluid. The common method used are listed below: Cage guiding: The cage allows positive alignment and control of the plug. The outside diameter of the valve plug is close to the inside wall surface of the cylindrical cage …

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What is an annunciator ?

INTRODUCTION The purpose of an alarm system (annunciator) is to bring attention to an abnormal or unsafe operating condition in the plant. Traditional annunciators used discrete alarm modules for this purpose. These dedicated hardware units are diminished in numbers but they are used in installations where simplicity is desired or where separation from the basic …

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What is Microprocessor Based Relay?

Introduction Microprocessor relays provide many functions that were not available in electromechanical or solid-state designs. Relay logic is very important to understand the microprocessor-based relay. The relay can be ON or OFF, that is, it has two stable states. Fig:  Microprocessor based overcurrent relay   Similarly, the output of a logic function is activated, that …

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