National Resistors
National Resistors
Shahu Nagar, Pune, Maharashtra
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Neutral Grounding Resistor

Our product range includes a wide range of buffer resistors, neutral earthing resistors, neutral grounding resistors and speed control resistor.

Buffer Resistors

Buffer Resistors
  • Buffer Resistors
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Approx. Price: Rs 60,000 / Unit
Buffer Resistors for application in heavy machinery is offered. These are instrumental in starting and controlling the speed of AC or DC motors. Made up of stainless steel AISI-304, AISI-410 or AISI 430 or FeCrAl-AISI-406, these are non-corrosive stable resistors. With rating varying from 2-10 minutes, it can be intermittent or continuous. The construct configuration of buffer resistors are as per the IPSS-1-10-002-82 with amendment no.1 and BS 587 for starting / speed control resistor; IS 2147 IS 12063 of 1987 for degree of protection for enclosure; IS 5 for paint shade and can meet other standards as required by client.

Specifications :
  • Uses : Starting and controlling the speed of AC or DC motors
  • Steel Grade : AISI-304, AISI-410 or AISI 430 or FeCrAl-AISI-406
  • Degree of Protection : IS 2147 IS 12063
  • Standard Followed : IPSS-1-10-002-82
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  • Minimum Order Quantity: 1 Unit
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Neutral Earthing Resistors

Neutral Earthing Resistors
  • Neutral Earthing Resistors
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Approx. Price: Rs 2.5 Lakh / Unit
A Neutral Earthing Resistors are used to restricts the flow of current during an earth fault on an alternate current distribution system. The resistor is connected between the neutral point of a transformer and earth or generator and earth. nbsp;

Specifications:- nbsp;

  • Resistance: - Resistors up to 66 KV
  • Time Duration:- 10 sec., 30 sec., 60 sec.
  • Material: - Stainless Steel, FeCrAl, Cast Iron, Copper Nickel or Nichrome.
  • Temperature:- 375 Degree Centigrade /760 Degree Centigrade or as required by the customer.

Highlights:
  • Resistance value pre-determined to operate fault-clearing relays and to prevent damages.
  • The system is designed as per to current and time ratings and compatible with the protection switchgear.
  • The resistance value is precise and determined and remains constant throughout life.
  • Made from tough steel grids of a high-quality iron-chrome-aluminum.
  • Non-corroding and offer good stability.
  • Mica and ceramic insulators.
  • The resistor in fully protected and ventilated steel enclosures.
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  • Minimum Order Quantity: 1 Unit
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Neutral Grounding Resistors

Neutral Grounding Resistors
  • Neutral Grounding Resistors
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Approx. Price: Rs 2 Lakh / Unit
Neutral Grounding Resistors are used in AC distribution networks to limit the fault current which would flow from the transformer or generator neutral star point in the event of an earth fault in the systems. It is used when the neutral of supply transformer is accessible and its own impedance is not enough to limit fault current. The rating of the Resistor should be so chosen that the fault current is limited to that necessary to operate the protection relays within the required time.

For Grounding Neutral of Transformer or Generator, Resistors up to 66 KV are offered for fault of short duration like 10 sec., 30 sec., 60 sec., continuous etc. Material of resistor is normally Stainless Steel, FeCrAl, Cast Iron, Copper Nickel or Nichrome. Temperature rise is normally 375o C/760oC or as required by customer.

Highlights- The metallic Neutral Grounding Resistors and Neutral Earthing Resistors are designed for specific resistance values and voltages especially for shorter time ratings. The Metallic Neutral Grounding Resistors have the following advantages over a liquid type :
  • Their resistance value is precise and determined at the manufacturing stage remaining constant throughout their life.
  • Their temperature Time constant is shorter allowing a resistor of shorter time rating to be used.
  • They are easier to install on site.
  • They require virtually no maintenance and have a longer useful life.
  • No anti frost heating is required nor anti condensation heaters generally.
  • Because of problem resulting from the evaporation of gel and electrolyte the liquid resistor require constant maintenance.
  • Invariably the type of cooling will be natural air-cooling.
Information to be furnished to us.
We request clients to furnish us the following input for custom-made Neutral Grounding Resistors -
  • Material of Resistor
  • Ohmic Value
  • Current Rating
  • Duty rating 10 sec., 30 sec., 60 sec., amp; continuous etc.
  • If details against ?b? and ?c? cannot be given then inform details of transformer such as KVA rating, full load current, Primary amp; Secondary Voltage.
  • System voltage / operating voltage.
  • Type of Enclosure and material for enclosure (protection class as per IS-12063)
  • Location : Indoor or outdoor.
  • Temperature rise allowed over an ambient temperature.
  • Whether space heater, current transformer, isolating switch on load / off load, manually / motorised, or any other other accessories are required.
  • Details of atmospheric conditions at site and height above sea level.
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  • Minimum Order Quantity: 1 Unit
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Speed Control Resistor

Speed Control Resistor
  • Speed Control Resistor
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Approx. Price: Rs 80,000 / Unit
Operating from an industrial location of Chinchwad, Maharashtra, India we are a manufacturer, supplier and exporter of Speed Control Resistor. These control resistors are fitted with several safety features that protect them from heat, overload, spark, and more. The offered products are used for controlling the speed of high power motors and promote ease in the braking, starting and related functions. The components fitted inside the enclosure are well integrated to perform the best. Compatible with different electronic systems, our Speed Control Resistor is highly reliable, simple and strong.

Specifications :

  • Rotor Current at full load
  • IPSS-1-10-002-82 with amendment no.1 and BS 587 for starting, speed control resistor
  • IS 2147 IS 12063 of 1987 for degree of protection for enclosure
  • IS 5 for paint shade

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Tests:
  • Routine Tests: - Following tests will be conducted
  • Visual and dimensional
  • Resistance value measurement with plusmn; 10 % tolerance
  • H.V. Test of twice the rated voltage +1000 volts for voltage class below 660 volts
  • Insulation resistance value measurement by using 500 V meager
  • Percentage (%) of slip required


Features:

  • Variable Configurations
  • Non-corrosive Property
  • Electricity Hazard Safety
  • Power Cable Gland
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Additional Information:

  • Minimum Order Quantity: 1 Unit
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Vishwanath Jetithor (Partner)
Shop No. 26, Jijamata Market, G Block, MIDC, Shahu Nagar
Pune- 411019, Maharashtra, India


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