Apart from manufacturing the mentioned test sets, we also manufacture equipment according to 
  specific requirements of customer.
   
  OIL TEST SET
  TRANSFORMER TURNS RATIO METER

  DOUBLE FREQUENCY DOUBLE VOLTAGE TEST SET

  AC HIGH VOLTAGE TEST SET

  TRANSFORMER WINDING RESISTANCE METER

  TAN DELTA RESISTIVITY TEST FOR INSULATING OIL

  CAPACITANCE & TAN-DELTA TEST SET FOR HIGH VOLTAGE EQUIPMENT

  PARTIAL DISCHARGE TEST SET

  MICRO OHM-METER

  NO LOAD & LOAD TEST BENCH

  INSULATION RESISTANCE CUM POLARISATION INDEX TEST KIT

  IMPULSE VOLTAGE GENERATOR

                            
 

                                                                       OIL TEST SET 

“NTPL” make Oil Test Set is ideal for testing of Breakdown/withstand test of transformer and circuit breaker oil, in accordance with IS 6792:1992 for oil testing.

Input: 230V + 10%, 50Hz., 1 phase AC.

Manually Operated Oil Test Set  (50 KV - 80 KV)	Motor Operated Oil Test Set ( 50 KV - 80 KV)
Microprocessor based Fully  Automatic  Oil Test Set
Manually Operated  Oil Test Set  (90 KV-120 KV)	Motor Operated   Oil Test Set  (90 KV - 120 KV)

   Selection chart: 

 Capacity: 10mA in the HT side for all sets.

  Transformer: H.V. Transformer used in the Test set is cast resin type of graded insulation with center  
  point of H.V. winding grounded.

  Protection:  Zero start interlocking & door-interlock is to be provided. Snap acting automatic tripping of  
  H.V. circuit in case of overload or breakdown of oil sample under test.

  Overvoltage indication (audio & visual) is also incorporated.

  Metering: Analog meter for manually & motor operated sets. Digital display for automatic  sets.

  Test Vessel: As per IS 6792:1992. A gauge is provided along with the cell to adjust the gap.

  Features that can be provided at extra cost for manually & motor operated sets:
  Capacity other than standard setting, Digital Metering, Stirring arrangement, Mushroom electrode,  
  Cylindrical electrode.

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TRANSFORMER TURNS RATIO METER

Transformer Turns Ratio Meter is compact in size and is capable to measure actual turns ratio of different types of transformers like Distribution, Power, CT, PT, Auto-transformers, Control & Measuring transformers etc.

TTR10

  FEATURES:
     Suitable to measure percentage ratio error directly.

     Polarity indication by phase sensitive null detector.

     Additional 3 phase switch network for Type TTR1P3, TTR10P3 & TTR20P3.

     Direct ratio error measurement range + 1% of the range with resolution of 0.05 %.

     Direct ratio error measurement accuracy + 0.25% of the reading.

     Null indicator: Center zero microampere meter fed through electronic null detector.     
       Digital meter may be provided at extra cost.

     Over load / Short circuit & HT/ LT reversal protection.

     Power supply input: 230 volts ± 10%, single phase, 50 Hz. AC.

  Note: Type TTR1P3, TTR10P3 & TTR20P3 have 3-phase switching network facility to make 
           interconnection cable operation easy.


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  DOUBLE FREQUENCY DOUBLE VOLTAGE TEST SET

This test set provides a continuously variable output voltage at  double frequency to test the insulation between turns of coils, layer to layer, terminals of windings with either uniform or  graded insulation  and 
also between the windings and earth, with graded insulation of both Distribution and  Power transformers. 
An alternating voltage of sine wave form (as much as possible) at double frequency (100 Hz.) and double 
in amplitude can be applied at one side of the  transformer under test while  the windings, which are  not 
connected to the  source of  excitation, are  left  on open circuit. This higher frequency is considered to 
avoid excessive excitation current during the testing.

dfdv020h

Voltage source: 
To generate a voltage at 100 Hz., one 3-phase squirrel cage induction motor is given a  supply through a star-delta switch. This motor drives the slip ring induction motor (generator). A variable voltage is also supplied to the generator thereby producing double frequency, which along with the output voltage of the generator is available across the terminals of the Set.

  Selection chart:

  Protection against over load, short circuit & single phasing provided.

  Metering: Digital frequency meter, ammeters & voltmeters. Ammeter and voltmeters are connected to CT & 
  PT of proper current and voltage ratio.

  Duty cycle  -    Suitable for 1 minute withstand test of transformer.

 Optional at extra cost:
 Step up transformer for testing 33/11 kV Power Transformers provided.

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                                                 AC HIGH VOLTAGE TEST SET   
 
NTPL" make High voltage testing sets are suitable for Power frequency AC high voltage test on transformers, motors, insulators, cables etc. The sets are capable of giving continuously variable AC HIGH VOLTAGE from zero to maximum rated output voltage.  

High Voltage Test Set (Oil Cooled)

High Voltage Test Set (Dry Type)

Input: Generally, 230 Volts, 50Hz, single phase AC, upto 10KVA & 400/415V, two phase out of three 
phases for sets beyond 10KVA.
However, we also manufacture AC H.V. sets workable on other input voltage at extra cost.

Output: Continuously variable from zero to maximum rated output voltage.

Capacity: Spread over a wide range of sets from 2.5KV to 300KV AC having capacities from several VA to hundreds of  KVA.
Duty cycle: Intermittent i.e., 5 minutes ON, 10 minutes OFF. However, test sets of  continuous or other duty cycles can also be manufactured at extra cost.  

Metering: Analog voltmeter & milliammeter/ammeter. Digital meters may be provided at extra cost.

Protection:  Tripping mechanism for protecting the H.V. transformer against over loading. The tripping mechanism can be adjusted at 25,50 & 100% of the rated current by a rotary switch. Below 100mA & 
above 20mA two adjustable tripping ranges are at 50% &100%, while for sets of 20mA capacity or below only 100% is adjustable [If required by the users tripping current can be made adjustable at other values, at extra cost].  
Apart from tripping mechanism, Zero start interlocking along with Overvoltage alarm & indication are provided.

Mode of operation: Sets are generally, motor operated beyond 20KVA & 50KV. Motorisation facility can be available below the specified value at extra cost.

H.V Transformer:  
H.V.Transformer used for the testing purpose can be oil cooled indoor type or Resin cast dry type as found suitable or particularly required by the customer. The H.V. winding of the high voltage testing transformers is of graded insulation, one end of which is grounded through milliammeter and tripping device while the other end remains in floating condition as H.V. terminal. These testing transformers are specially designed to withstand frequent intermittent spark over or momentary short circuit conditions under which such testing 
transformers are supposed to operate.

Discharge Rod: For device under tests having large capacitance, discharge rod may be provided at an extra cost.

While sending enquiry for quotation or order please specify the following:  
        Input voltage and frequency.
         Maximum output voltage.
         Capacity.
        Type of transformer –Oil cooled or Cast Resin
         Duty Cycle.
         Mode of operation: Manual/Motor operated.
         Any other details you find important to be specified.  

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TRANSFORMER WINDING RESISTANCE METER

This Test set is suitable to measure winding resistance of transformers, single or 3-phase, star or delta connected upto several MVA.Two independent displays read the resistance of both primary & secondary windings simultaneously. However, primary or secondary winding can also be measured separately. 
DC Power source allows the selected current to flow through the winding /windings and the voltage developed across the winding are sent to instrumentation amplifiers, thereby displaying directly the ohmic value.

UONT010A

  Technical Features:  

  Input Power Supply: 230V +10%, single phase, 50Hz. AC.
  Accuracy: +1% of selected resistance range.
  Display: 2 nos., 3^1/2 digit LED module for resistance measurement.

  Protection:
         Protection against current lead disconnection while in use, Induction Kickback suppression, Snap acting 
       overload protection.



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                      TAN-DELTA & RESISTIVITY TEST FOR INSULATING OIL
                                                                         Type: tdrnt02

 TDRNT02 measures dielectric parameters like D.C. resistivity, dielectric constant and loss factor of the  
 insulating oil of transformers, circuit breakers etc.

  Loss angle & dielectric constant MODE:
 This mode can measure dielectric constant & dissipation factor (tanδ).

 Measuring Range                       :  Dielectric constant 1 to  10                                                       
                                                 Dissipation factor 0.01% to 100%
 Accuracy                                 :  Dielectric Constant + 2% of reading + .001 of FSD
                                                 Dissipation factor + 3% of reading + .0001 tanδ

 Test Voltage for loss factor         :  0 to 2000 V AC, 50 Hz.
  Metering                                  :  Digital

  Resistivity mode:  

  This mode is provided with 500 V DC power supply with accuracy of + 5% to measure the 
  resistivity of the sample under test.
  Range                 :           10⁹ to 10¹⁶ ohm-cm in 7 ranges.
  Test Voltage        :           500 V DC.
  Accuracy             :           + 10% of reading + 2% of corresponding range FSD
  Metering              :           Analog

  Three Terminal oil CELL:

  The cell is fabricated out of stainless steel and Teflon is the insulating material used for isolation of the   
  three electrodes i.e. H.T. Electrode, Guard Electrode and Central Electrode.

  Heating CHAMBER:

  This chamber uniformly heats the test cell and sample under test upto desired temperature to a maximum   
  limit of 120⁰ C.

  Temp. Range                              :  From