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Rheostat - Oct, 27 2007

Rheostat are used for varying resistances.

Comes in different sizes like 6", 8", 10" etc.

Made of different coil turns as per requirement like kanthal wire etc

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Liquid rheostats used as motor start switches, circa 1900

A liquid rheostat orwater rheostat

[1]

orsalt water rheostat is a type ofvariableresistor. It consists of a tank containingbrine, in whichelectrodesare submerged to

create anelectrical load. The electrodes may be raised or lowered into the liquid to

respectively decrease or increase theelectrical resistanceof the load. To stabilize the

load, the mixture must not be allowed to boil. The salt water rheostat operates at unity

power factorand was widely used by generator assemblers, until 20 years ago, as a

matter of course. They are still constructed for the commissioning of large diesel

generators in remote places, where discardedoil drumsandscaffold tubestypically

form the tank and electrodes.

Description [edit]

Typically a liquid rheostat consists of a steel cylinder (thenegative), about 5 feet

(1.5 m) in size, standing on insulators, in which was suspended a hollow steel cylinder.

This acted as thepositive electrodeand was supported by a steel rope and insulator from

an adjustable pulley. The water pipe connection included an insulated section. The tank

contained salt water, but not at the concentration that could be described as brine. The

whole device was fenced off for safety.

Operation was very simple, as adding more salt, more water or varying the height of the

centre electrode would vary the load.[2]The load proved to be quite stable, varying only

slightly as the water heated up. It never came to the boil. Power dissipation was about 1megawatt, at a potential of about 700voltsand current of about 1,500amperes.

Advantages and disadvantages [edit]

An advantage is silent operation, with none of the fan noise of currentresistive grid

designs.

Disadvantages include:

corrosion to the copper connection cables and to the wire rope lack of insulation from ground which may trip aground detection system

http://en.wikipedia.org/wiki/Liquid_rheostat#cite_note-1http://en.wikipedia.org/wiki/Liquid_rheostat#cite_note-1http://en.wikipedia.org/wiki/Liquid_rheostat#cite_note-1http://en.wikipedia.org/wiki/Variable_resistorhttp://en.wikipedia.org/wiki/Variable_resistorhttp://en.wikipedia.org/wiki/Variable_resistorhttp://en.wikipedia.org/wiki/Variable_resistorhttp://en.wikipedia.org/wiki/Brinehttp://en.wikipedia.org/wiki/Brinehttp://en.wikipedia.org/wiki/Brinehttp://en.wikipedia.org/wiki/Electrodehttp://en.wikipedia.org/wiki/Electrodehttp://en.wikipedia.org/wiki/Electrodehttp://en.wikipedia.org/wiki/Electrical_loadhttp://en.wikipedia.org/wiki/Electrical_loadhttp://en.wikipedia.org/wiki/Electrical_loadhttp://en.wikipedia.org/wiki/Electrical_resistancehttp://en.wikipedia.org/wiki/Electrical_resistancehttp://en.wikipedia.org/wiki/Electrical_resistancehttp://en.wikipedia.org/wiki/Power_factorhttp://en.wikipedia.org/wiki/Power_factorhttp://en.wikipedia.org/wiki/Oil_drumshttp://en.wikipedia.org/wiki/Oil_drumshttp://en.wikipedia.org/wiki/Oil_drumshttp://en.wikipedia.org/wiki/Tube_and_clamp_scaffoldhttp://en.wikipedia.org/wiki/Tube_and_clamp_scaffoldhttp://en.wikipedia.org/wiki/Tube_and_clamp_scaffoldhttp://en.wikipedia.org/w/index.php?title=Liquid_rheostat&action=edit&section=1http://en.wikipedia.org/wiki/Cathodehttp://en.wikipedia.org/wiki/Cathodehttp://en.wikipedia.org/wiki/Cathodehttp://en.wikipedia.org/wiki/Anodehttp://en.wikipedia.org/wiki/Anodehttp://en.wikipedia.org/wiki/Anodehttp://en.wikipedia.org/wiki/Liquid_rheostat#cite_note-2http://en.wikipedia.org/wiki/Liquid_rheostat#cite_note-2http://en.wikipedia.org/wiki/Liquid_rheostat#cite_note-2http://en.wikipedia.org/wiki/Megawatthttp://en.wikipedia.org/wiki/Megawatthttp://en.wikipedia.org/wiki/Volthttp://en.wikipedia.org/wiki/Volthttp://en.wikipedia.org/wiki/Volthttp://en.wikipedia.org/wiki/Amperehttp://en.wikipedia.org/wiki/Amperehttp://en.wikipedia.org/wiki/Amperehttp://en.wikipedia.org/w/index.php?title=Liquid_rheostat&action=edit&section=2http://en.wikipedia.org/wiki/Load_bank#Resistive_load_bankhttp://en.wikipedia.org/wiki/Load_bank#Resistive_load_bankhttp://en.wikipedia.org/wiki/Load_bank#Resistive_load_bankhttp://en.wikipedia.org/wiki/Load_bank#Resistive_load_bankhttp://en.wikipedia.org/wiki/Residual-current_devicehttp://en.wikipedia.org/wiki/Residual-current_devicehttp://en.wikipedia.org/wiki/Residual-current_devicehttp://en.wikipedia.org/wiki/File:LIquid_switches_(Modern_Electrical_Practice,_Vol_2).jpghttp://en.wikipedia.org/wiki/File:LIquid_switches_(Modern_Electrical_Practice,_Vol_2).jpghttp://en.wikipedia.org/wiki/File:LIquid_switches_(Modern_Electrical_Practice,_Vol_2).jpghttp://en.wikipedia.org/wiki/File:LIquid_switches_(Modern_Electrical_Practice,_Vol_2).jpghttp://en.wikipedia.org/wiki/Residual-current_devicehttp://en.wikipedia.org/wiki/Load_bank#Resistive_load_bankhttp://en.wikipedia.org/wiki/Load_bank#Resistive_load_bankhttp://en.wikipedia.org/w/index.php?title=Liquid_rheostat&action=edit&section=2http://en.wikipedia.org/wiki/Amperehttp://en.wikipedia.org/wiki/Volthttp://en.wikipedia.org/wiki/Megawatthttp://en.wikipedia.org/wiki/Liquid_rheostat#cite_note-2http://en.wikipedia.org/wiki/Anodehttp://en.wikipedia.org/wiki/Cathodehttp://en.wikipedia.org/w/index.php?title=Liquid_rheostat&action=edit&section=1http://en.wikipedia.org/wiki/Tube_and_clamp_scaffoldhttp://en.wikipedia.org/wiki/Oil_drumshttp://en.wikipedia.org/wiki/Power_factorhttp://en.wikipedia.org/wiki/Electrical_resistancehttp://en.wikipedia.org/wiki/Electrical_loadhttp://en.wikipedia.org/wiki/Electrodehttp://en.wikipedia.org/wiki/Brinehttp://en.wikipedia.org/wiki/Variable_resistorhttp://en.wikipedia.org/wiki/Variable_resistorhttp://en.wikipedia.org/wiki/Liquid_rheostat#cite_note-1

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High power rheostatmax. 240 k, 1 500 - 7 000 W | STV - SQV series

The Coudoint STV and SQV High Power Rheostats are characterized by:

- ohmic values from 0,74 to 60 k- power ratings from 1.5 to 7 kilowattswith numerous possibilities : DC, AC single-phase or 3-phase rheostat or variable load, with

manual or motorized slider drive, use of rheostats assemblies for achieving higher power ratings,etc.

These rheostats are constructed of 3 (STV Series) or 4 (STV Series) wirewound cylinders, with 4cylinder sizes:- STV1 (1500 W), STV2 (2500 W), STV3 (3750 W), STV4 (5250 W)- SQV1 (2000 W), SQV2 (3330 W), SQV3 (5000 W), SQV4 (7000 W)

These products, which we have been providing for decades, have proven their quality anddurability time and again, with:- windings made of low-temperature coefficient resistance wire to insure the best stability of theohmic value

- slider mechanisms optimized to provide a smooth motion and a high resistance to wear(durability)

- numerous options available: type of terminal connections, graded or Ayrton-Perry windings,manual or motorized slider drive, etc.

Each rheostat is built at the required ohmic value, in the range of feasible values. Using various

connection diagrams, the product can be wired as a single variable load or a rheostat with highcurrent capability, or as a three-phase load or rheostat: See our "Sliding Rheostat" technicaldocumentation for more details.

Special models can be designed for specific needs.

Our team will be happy to help you choose the solution that best fits your application: Pleasecontact us.

We sell and ship all over the world.

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The Coudoint STV and SQV High Power Rheostats are characterized by:

- ohmic values from 0,74 to 60 k- power ratings from 1.5 to 7 kilowatts

with numerous possibilities : DC, AC single-phase or 3-phase rheostat or variable load, withmanual or motorized slider drive, use of rheostats assemblies for achieving higher power ratings,etc.

These rheostats are constructed of 3 (STV Series) or 4 (STV Series) wirewound cylinders, with 4cylinder sizes:

- STV1 (1500 W), STV2 (2500 W), STV3 (3750 W), STV4 (5250 W)- SQV1 (2000 W), SQV2 (3330 W), SQV3 (5000 W), SQV4 (7000 W)

These products, which we have been providing for decades, have proven their quality and

durability time and again, with:- windings made of low-temperature coefficient resistance wire to insure the best stability of the

ohmic value- slider mechanisms optimized to provide a smooth motion and a high resistance to wear(durability)- numerous options available: type of terminal connections, graded or Ayrton-Perry windings,manual or motorized slider drive, etc.

Each rheostat is built at the required ohmic value, in the range of feasible values. Using variousconnection diagrams, the product can be wired as a single variable load or a rheostat with highcurrent capability, or as a three-phase load or rheostat: See our "Sliding Rheostat" technicaldocumentation for more details.

REOSTATO PARA SOLDAR CON ARCO

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