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Degree of Protection is IP -33 Unless otherwise specified however any degree of protection
IP - 00 to |
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IP - 55 can be offered. Tested designs are IP - 55, IP - 33 and IP - 43. |
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Canopy is sloped to prevent accumulation of water. Overhang is provided on request to cover
terminal box. |
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Forged Eye Bolts or Lifting Angles ensure easy handling. |
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Gl Wire Mesh below canopy is provided for ventilation purpose. This feature does not
exist for
IP - 55 enclosures. |
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Basic construction of enclosure is an angle iron welded structure which provides rigidity. |
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Removable bolted side covers of 2 mm thick mild steel are louvered for ventilation. GI wire mesh is |
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welded from inside to assure required degree of protection. No louvers are given for IP 55 enclosures. |
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Hinged doors are provided whenever any instruments like relays or meters are to be flush mounted. |
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Then enclosures are painted with synthetic enamel paint of specified shade. |
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Other options are epoxy paint or aluminimum paint. |
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Pretreatment, which includes,
degreasing rust / scale removing, phosphating as per applicable |
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standards, is done followed by 2 coats of finishing paint of required shade. Ovendrying or stoving
is done on request. |
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| INTERNAL FEATURES OF RESISTOR ENCLOSURES |
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Resistance banks are bolted on angles welded to the angle iron structure, facilitating easy drawout facility when required. |
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Insulation between resistance element and supporting tie rod is provided by a mica sleeve. |
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The tie rod is insulated from the supporting structure by 3 Groove Insulators. |
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A sloped bottom sheet is welded to the angle iron structure and drain plug is provided at suitable place. |
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In case of continuous current ratings for better heat dissipation, perforated sheet with welded GI wire |
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mesh is provided at the bottom. |
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Foundation channels welded to the angle iron structure are provided on two sides with arrangement to |
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fix on foundation by bolts. |
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Indoor enclosures, do not have sloping or overhang features of the canopy. The bottom welded sheet is also not sloped. |
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Gland plate for bottom cable entry in terminal box is provided if applicable. In case of busduct connections, a flange of specified dimensions is provided for connection to transformer. |
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Terminals are brought through porcelain bushings of appropriate voltage class. |
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In case of higher voltage the banks are placed on stand off insulators housed inside the enclosures. |
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Optional features : |
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(Provided on request) |
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# Safety Screen for enclosures
# Stand off insulators
# Supporting structures
# Aluminium covers instead of MS.
# Hot dip galvanised enclosure
# Stainless steel hardware |
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| DESIGN OF RESISTOR ELEMENT |
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Resistor elements are designed to carry rated current for the rated time without exceeding specified temperature limits. In case of short time ratings, dissipation is negligible and the temperature rise for the resistor element depends on its capacity to store the energy generated in proportion to the mass and specific heat of the material used. |
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When the current flows continuously for a relatively long duration, the temperature of resistor element increases and then
stabilizes at value for which energy supplied is entirely dissipated to the
atmospheres. Hence such resistors are designed to allow for maximum heat dissipation. |
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AMPCONTROL has the backing of over 25 years of experience that its promoters have gained in design and manufacture of RESISTORS.
A comprehensive quality assurance plan and adherence to international specifications ensures a durable competitively priced product which meets the customer requirements.
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Our growing list of customers in India and abroad include : |
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 ELECTRICAL TURNKEY CONTRACTORS |
BUS DUCT MANUFACTURERS |
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| SIEMENS LTD. |
CONTROLS & SWITCHGEAR |
| BHARAT BIJLEE LTD. |
NARMADA FABRICATORS |
| BHARAT HEAVY ELECTRICALS LTD. |
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| INDUSTRIES |
TRANSFORMER MANUFACTURERS |
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| BALLARPUR INDUSTRIES LTD. |
BHARAT BIJLEE LTD. |
| INDO RAMA SYNTHETICS INDIA LTD. |
EMIRATES TRANSFORMERS & |
| KERALA MINERALS & METALS LTD. |
SWITCHGEARS, UAE. |
| CENTURY ENKA LTD. |
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| TURBINE GENERATOR / DIESEL |
POWER, COAL, STEEL SECTORS |
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| GENERATOR SET MANUFACTURERS |
NORTHERN COALFIELDS LTD. |
| DLF INDUSTRIES |
NATIONAL THERMAL POWER CORP LTD. |
| TRIVENI ENGINEERING WORKS LTD. |
INDIAN IRON & STEEL LTD. |
| BHARAT HEAVY ELECTRICALS LTD. |
BSES LTD., AEC LTD. |
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| AMP CONTROL RESISTORS HAVE BEEN EXPORTED TO MALAYSIA, SRI LANKA, SINGAPORE AND DUBAI |
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| SELECTION OF RESISTOR MATERIAL |
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DESIRABLE QUALITIES OF RESISTOR MATERIAL ARE : |
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• HIGH RESISTIVITY |
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• LOW RESISTANCE TEMPERATURE COEFFICIENT |
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• CORROSION RESISTANCE |
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| MATERIAL |
STURDINESS |
RESISTIVITY
MICRO OHM / CM |
CORROSION
RESISTANCE |
COST SCALE
1 TO 5 |
FREQUENT
APPLICATION AREA |
CAST IRON
CAST STAINLESS |
BRITTLE
STURDY |
72
72 |
FAIR
GOOD |
2
4 |
GROUNDING
STARING
LOADING
DAMPING |
PUNCHED
STAINLESS STEEL |
STURDY |
72 |
GOOD |
3 |
LOCOMOTIVES
STARTING
GROUNDING |
ROD / WIRE FORMED
STAINLESS STEEL |
STURDY |
72 |
GOOD |
3 |
GROUNDING
LOCOMOTIVES
STARTING |
EDGE WOUND
STAINLESS STEEL |
STURDY |
72 |
GOOD |
4 |
STARTING |
WIRE WOUND
STAINLESS STEEL
CONSTANT NICHROME
MANGANIN KANTHAL |
FRAGILE |
72
49
123
43
123 |
GOOD |
3
4
4
3
4 |
LOADING
STARTING
DAMPING |
EDGE WOUND
CHROME ALUMINIUM
ALLOY (AISI 406) |
STURDY |
123 |
FAIR |
5 |
LOCO
MOTIVES
STARTING |
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PUNCHED CHROME
ALUMINIUM ALLOY
(AISI 406) |
STURDY |
123 |
FAIR |
4 |
GROUNDING
STARTING |
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| DATA TO ACCOMPANY THE ENQUIRY |
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The following data is required to be sent along with the enquiry : |
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| • Material of resistor |
• Temperature rise |
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| • Time Rating |
• Voltage Class |
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| • Current Rating |
• Ohmic Value |
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| • Sheet Thickness |
• Protection Class of enclosure |
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| • Outdoor / Indoor Sheet |
• For starting resistors |
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| • Rotor Voltage |
• Rotor Amps |
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| • Slip |
• Starting & Full Load Torque |
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| • No. of steps |
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| • Type of Coating (Synthetic Enamel Paint / Epoxy paint / Hot dip Galvanised) |
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| • Space Heater with Thermostat |
• Stand off Insulator |
| • Aluminium Covers instead of MS |
• Earth Fault Current Transformer |
| • Supporting Structure Safety Screen |
• Ammeter |
| • Earth Fault Relay |
• Off Load Isolator / On Load Isolator |
| • Cable Sealing kit |
• Lugs |
| • Glands |
• Indicating Lamps |
| • Non Magnetic Gland Plate |
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