Skip to main content

Heat Effects of Electric Current | Conductor | Insulator | Common causes of Electrical Fire

WHAT IS THE HEAT EFFECT OF ELECTRIC CURRENT:

   When current passes through a conductor heat is produced. This is in fact the work that is required to be done is sending the current against the resistance, which is converted into heat.

Heat produce in the conductor is directly proportional to :

• Square of the current passing through conductor 12
• The resistance of the conductor 'R' and 
• The time of flow 't'

Combining the proportionality, we get,

H = 0.24121RT

Where, 'H' is heat produced in calories, 'T' is current in ampere resistance on ohm and 't' is the time of flow in second.

   The phenomenon is particularly important to Firefighter as so produce if not dissipated safety, will raise the temperature ultimately ignites the combustible materials available in the near.

What are Conductor & Insulator?




   Conductors are the materials which allow the flow of e.g. through them with least resistance, e.g. Copper, Alluminium, Iron, Water where is the internet hazaar the materials which do not allow the electrons through them. E.g. wood ( dry ), rubber, plastic, glass, mi.

Generation and Distribution of Electricity:



   The bulk production of electricity is done by converting other of energy voz,  heat and potential energy at place which are known power station. In india, the most common power plant include,
  • Thermal power station
  • Hydro-power station
  • Nuclear power station
   In a thermal power station coal is bruned to produce heat e.g. which is utilised in converting water into steam ( temperature about and pressure 150 kgf/cm2 ) which in turn runs the steam turoine the converting the pressure energy is further utilised in rotation the general produce electrical energy.
In hydro power station water is connected at her attitude when allowed to flow at lower level discharge water at high pressure, high pressure flow rotates the water turbine converting the pressure into mechanical energy which is subsequently utilise for running generator to produce electrical energy.
In a Nuclear power station, fissin reaction in a radio electro material allowed to take place in nuclear reaction which provides heat energy. This heat energy is used in converting water into stable running the turbine which gives mechanical energy. The mechanical energy so produce is used in running the generator to produce electricity.
The electricity produce at either of the three power station is a low pressure ( voltage ) current and since, for distributing electricity at distance places, high pressure ( voltage ) ignrequired and electrical equipment, namely transformer are used to increase the pressure and then through transmission lines electricity is transmitted to distance place. Since, low pressure ( voltage ) current is the requirement of the consumer. Hence, wherever tapping done stop down transformer are used to reduce the voltage depending upon the consumer requirement and then supplied to the users. Step up transformers are used at generating station where is step down transformer are you sad electrical sub-station.

Common Causes of Electrical Fire and Remideal Measures: 


Fire hazards of electrical origin maili due to the in proper use of electricity in proper electrical installation and let of arc in the maintenance of the electrical system and decorate fir mostly originated mostly from the sparx offer heating of electrical equipment switch maybe cause by the following :
  • Short circuitcircuit
  •  of insulation
  • Overheating of Electrical equipment
  • Improper selection of equipment/wiring
  • Loose electrical contacts
  • Discharge of static charge.
With few exceptions most of the fire originated by electricity can be prevented by :
  • Selecting the proper rating electrical equipment and wiring
  • Avoiding the excess loading of Electrical equipment
  • Using proper capacity fuse/circuit breaker
  • Ensuring effective earthing of Electrical equipment and in installation
  • Periodic inspection and testing of electrical circuit and equipments.



Stay Connect With Fire &  Industrial Safety Engineering and Keep Learning more.
Labels:

Comments

Post a Comment

Popular posts from this blog

(NRV) Non-Return Valves | Check Valves - Symbol, Types and Importance

(NRV) Non Return Valve A Non- Return Valves , check valve , clack valve, non- return valves , reflux valve, retention valve or one-way valve is a  valve that normally allows  fluid  ( liquid or gas ) to flow through it in one direction only.    Non  - Return valve/ Check valve are two-port valves, meaning that they have two openings in the body, one to enter the  fluid and the other to release the liquid. Types of (NRV) Non - Return Valves There are various types of check valves/non-return valve used in a wide variety of applications.  Non- return valves are often part of common household items.   Although they are available in a wide range of sizes and costs, Non - Return valve are generally very small, simple or inexpensive. Non - Return valve operate automatically and most are not controlled by an individual or any external control;  Accordingly, most have no valve handle or stem. The bodies (outer shells...
2 comments
Read more

(RFRL) Rainforced Rubber Line - EngineeriSafety

(RFRL)  Rainforced Rubber Line    RFRL Rainforced Rubber Line -   Reinforced rubber  products are the largest group of composite materials , though they are rarely referred to as composite materials.  Examples familiar are automobile tyres , hoses and conveyor belts . Composite Rainforced Structure   Reinforced rubber  products combine a  rubber matrix and a reinforced material, so that the strength of elasticity to high strength is achieved.  Reinforcing material, usually a type of fibre , provides strength and stiffness.  The rubber matrix, with reduced strength and stiffness, provides air-liquid tightness and supports refreshing materials to maintain their respective positions.  These positions are important because they in turn affect the mechanical properties.      A composite structure where all fibers are everywhere loaded at the same pressure is called an isotropic structure, and the type of ...
Post a Comment
Read more

What are the Methods of Extinguishing Fire | Methods of Extinction and prevention

Method of Extension and Prevention: Fire depends upon a reaction between two substance and continuous because of self generated heat. There are four ways of Extinguishing fire i.e., by cooling the fuel below its ignition temperature. By cutting  off the oxygen, by cutting off the supply of fuel or by prohibiting the formation of chain carriers. This is achieved by  -  Taking away the heat faster heat it is generated. Separating the substance apart. Cooling the combustible material and its surrounding to a temperature search that fire die for want to heat. Smoothing the fire by preventing air from reaching eat or by diluting air with some inert gas ( smothering ). Starving the fire by removing combustible material fuel supply. What are the Methods of Fire Extinguishing: COOLING METHOD: Extinction by cooling is achieve, when the rate of heat generated is less than the rate the heat remove, hence the fire die water is...
Post a Comment
Read more