Apart from manufacturing the mentioned test sets, we also manufacture equipment according to 
  specific requirements of customer. 
  

  AC HIGH VOLTAGE TEST SET

  DC HIGH VOLTAGE TEST SET

  CABLE FAULT LOCATOR

  CAPACITANCE & TAN-DELTA TEST SET FOR HIGH VOLTAGE EQUIPMENT

   PARTIAL DISCHARGE TEST SET

  MICRO OHM-METER 

    AC CURRENT INJECTION SET

    MILLIVOLT DROP TEST SET

   AC HIGH VOLTAGE SPARK TESTER FOR CABLE    

 

                                            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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                                            DC HIGH VOLTAGE TEST SET 

NTPL" make High voltage testing sets are suitable for testing electrical insulation of condensers,  transformers, motors, insulators, cables etc. The sets are capable of giving continuously variable DC HIGH VOLTAGE from zero to maximum rated output voltage.

Input: Generally, 230 Volts, 50Hz, single phase AC. 
However, we also manufacture DC 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 1 KV to 300KV with current capacity upto 100mA.
Sets of higher current capacity can also be manufactured.
 
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: Output DC high voltage measured by HV resistor chain along with micro-ammeter scaled in kV. Milli-ammeter to measure the leakage current.
Digital meters may be provided at extra cost. 

Protection: Overload & short circuit provided. Zero start interlocking along with Overvoltage alarm & indication are provided. 

Mode of operation: Generally, sets are manually operated. Motorisation facility can be available at extra cost.

Units: Generally DC high voltage test sets are available in one unit upto 35KV and sets of higher output voltage are commonly manufactured in two units i.e. the control unit & Transformer–Rectifier unit. This Transformer–Rectifier unit are made cascaded type above 80KV. However, NTPL always welcome customers' choice regarding the no. of units.

Discharge rod: A discharge rod is provided with the set.
DC high voltage is generally obtained by simple rectification of AC high voltage or by multiplication of relatively low AC high voltage by proper multiplier circuits as is found suitable for a particular DC HV test set. HV transformers of the Test Sets are Cast Resin types.  

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

                                  underground cable fault locator 

Cable Fault Locator Bridge (Type-cflnt 02)

This Test Set is capable to locate Short circuit faults, High Resistance Earth faults that can be performed by H.V. D.C. source & Open circuit faults in all types of L.T. & H.T. armored underground cables (even P & T cables).  

Cable Fault Locator

  Features:  

     Detection by Null technique. Capable to overcome the effect of cable capacitance & foreign potential. 

     Isolated for High Voltage.

  Power Source: External Power source of 12 volts DC nominal, capable to deliver 100mA current is  
                   supplied along with the locator.

  For Short circuit fault detection: Current measurement 100mA with input Impedance selection in multiple 
                                             ranges. 

  Open circuit Fault detection: Capacitance Bridge technique.    

  Cable Fault Locator Bridge may be provided with the following additional: 

  Additional (1):     AC Mains cum Battery Operated DC HV Power Supply  

                                            Series- DHVMCBPS  (Type- 2K5V050m) 

  Input   : 230 V, 50Hz,single phase AC mains & built-in rechargeable battery.

  Output: 25 Volts to 2500 volts DC. Max.capacity - 50mA with built-in short circuit protection.  

  Additional (2):     Surge Generator cum DC HV Test Set for Testing & Burning Faults                                                                                                    (Type - SGNT14)  

  Apart from providing output voltage for DC High Voltage testing, the surge generator cum DC HV test kit 
  is designed to produce single as well as repetitive high-energy surges and can be used in conjunction 
  with Cable Fault Locator.

  Input: 220/240 volts, 50Hz, 1KVA, approx.

Output: Continuously variable from (i) 0 to 3.5KV DC, (ii) 0 - 7.0 kV DC & (iii) 0 - 14 kV DC.

  Maximum Current: 150mA at 3.5 kV range, 80mA at 7.0 kV range & 50mA at 14 kV range.
   
  Features:  
       Low input power.  
       Automatic discharge of internal capacitor and circuit under test if mains supply switched off. 
        Controls interlocked for complete safety.  
       A key operated safety switch prevents unauthorized operation of the model SGNT14.

  Additional (3): Cable Fault Burner (Type -CFBNT)  

  To detect fault resistance higher than 10 Mega ohms CFBNT is suitable to burn down the faulty cable 
  relatively to a low resistance fault.  

  Input   :  230 volts, 50Hz, single phase AC.  
  Output : Continuously variable from 0 to 10KV.  
  Capacity : Burning current upto 50mA. Output is featured with drooping characteristic to have better 
                 control on over burning.  

  Additional (2) or Additional (3) can be selected alternatively.

  Additional (1), Additional (2) & Additional (3) are provided with-  
       Metering for output voltage & current measurement.  
       Overload tripping mechanism, Over voltage indication lamp & buzzer will be provided.  
       Zero start inter locking will be provided to ensure that the H.V. circuit cannot be energized unless the 
       regulator is first returned to zero position.  

  Additional (4): Thyristor Thumper (Type-NTTTH01)  

  Single or repetitive fault can be re-energized by a switch for a preset length of time usually 10 cycles. 
  If the current crosses the highest current level before the completion of 10 cycles, the current injection 
  is switched off to avoid unnecessary over burning of the cable under test. The set can also be operated 
  in a single shot mode.  
 
  The Set is used to pin point faults particularly for low voltage cables.  
 
  Input: 230V, single phase, 50Hz., AC.  
  Output: 50Amps max.
  
  Features:  

  Safety interlocks are provided  
  Low Power is required.    
 

            CAPACITANCE  & TAN-DELTA TEST SET FOR HV EQUIPMENT 

  Capacitance & Tan-Delta Measuring Equipment along with its accessories is suitable for testing motors,   
  Power Transformers, H.V. Bushings, Generators, Power Capacitors, cables etc. at power frequency. Periodic   measurement of dissipation factor & capacitance on new solid insulators and those on long service period   
  produces comparative result about the trend of deterioration of insulation resistance before insulation 
  breakdown occurs. 
  Thus, the set is ideal to conduct routine diagnostic tests on solid insulating components, equipment   
  required for High Voltage generation, Transmission and Distribution.

The Set is in four units:       i. Capacitance & Tan-Delta Measurement Bridge      ii. High Voltage AC Power Supply Control Unit     iii. High Voltage AC Power Supply Transformer Unit     iv. Standard Capacitor

Capacitance & Tan-Delta Test Set

  Standard test modes
  1.   UST -            UNGROUNDED SPECIMEN TEST.
          Reduces the effect of stray capacitance to ground. Maximum accuracy is obtained in this mode.
  2.   GST -            GROUNDED SPECIMEN TEST.
         Mostly used in outdoor installations, power systems when the object under test is permanently 
       grounded. Exp. Windings of Transformer to tank and core, Coils of Rotating machine, circuit breaker 
       assembly etc.
  3.   GST-G – GROUNDED SPECIMEN TEST WITH GUARD.
         Performed to measure stray capacitance and separate it from values obtained in GST test. 

 Capacitance & Tan-Delta Measurement Bridge  

    Type                        Test Voltage               Current Capacity                     

  CTDNTE12                  0-12KV                         200mA Max. 
  CTDNTE20                    0-20KV                          2A Max.                                                       

  Input: 230Volts, single phase, 50Hz. AC. 

  Capacitance measurement: 
  Value of Standard                 C_x  x four                                Resolution                                             Accuracy
  Capacitor (Cs) used          multiplier range
  -------------------------------------              ------------------------------               ---------------------                -------------------------------------------
        100 pF                                   1 pF to 0.11 mF                  0.1 pF                    + 0.2% of reading + .1 pF
      1000 pF (1 nF)                     10 pF to 1.1 mF                      1 pF                     + 0.2% of reading + 1 pF
      10000 pF (10 nF)                 100 pF to 11 mF                   10 pF                     + 0.2% of reading + 10 pF 

  Tan – Delta measurement:
     Tan-Delta        Tan-Delta                         Resolution                                                    Accuracy
        Factor                   Range
        ----------------                          --------------------------                             ----------------------                               -------------------------------------------
           0.1               1 x 10^-4 to 0.11                   2 x 10^-6                        + 2% of reading + 2 x10^-5
          1.0                1 x 10^-3 to 1.11                    2 x 10^-5                        + 1% of reading + 2 x10^-4
        10.0              1 x 10^-2 to 11.1                    2 x 10^-4                        + 1% of reading + 2 x10^-3

       Special shielding arrangement has been designed for this kit to suppress external interference. These  
  enable accurate measurements even in electrically noisy environment particularly in switchyards.

  High Voltage AC Power Supply

  Input: 415Volts, two phase out of three phase, 50Hz. AC. 

  Series            Type            Test Voltage             Current Capacity               Duty Cycle

  ACHVCTD     12K200m         0-12KV                      200mA                        15 mins.
                                                                                         100mA                      continuous  
 ACHVCTD      20K2A            0-20KV                           2A                        30 mins.
                                                                         1.5A                          60mins.
                                                                           1A                       continuous
 Metering:
        3^1/2  digital panel voltmeter & ammeter

 Standard Capacitor

 Wide range of NTPL Standard capacitors are load loss stable capacitors designed for use with Capacitance
 & Tan -Delta Bridge. 

 Additional at extra cost

         Range extension current transformer         Reactor

Sets at other test voltages, capacity, measurement ranges can also be manufactured on request of customer.  

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                                        PARTIAL DISCHARGE test set  
                                                           type: pdnt02
                                                           
This Test Kit is used for non-destructive means of assessing the quality of high voltage transformers, motors, cables etc., which are used in generation & distribution of electric power.  

The basic system consists of-
  Discharge measuring module
    Input                     :  230volts, 50Hz., single phase AC.
    Measuring Range: 0 to 5,50,500,5000pC in different switchable ranges.
                              Discharge pulses can be detected and measurement can be done in analog scale 
                              as well  as in PC.

  MATCHED MEASURING IMPEDANCE
    In series with standard capacitor this forms a voltage divider and decouples the high  frequency signals to
  feed the discharge measuring module. The set is electro statically shielded.

  Standard Capacitor: 100pf or 1000 pf.
  C.R.O. suitable for the above
  Calibrating Pulsar

  OPTIONAL AT EXTRA COST:
  40 kV AC high Voltage measuring system 
  Auxiliary Supply Voltage: 230 Volts, 50Hz, single phase, AC.
  Range: 0 - 40 kV AC
  Metering: 3^1/2 digital panel meter.


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                                                                 MICRO OHM-METER                             
                                                                        (Type: UONT100A)

This Test Set is capable to measure low resistance like switch contacts, breaker contacts, busbar splices, joints, fuses, low inductive windings etc. by circulating high value of D.C. through the contact/junction and  measuring D.C voltage drop (4 terminal method) which, sent to instrument amplifiers , thereby being displayed on resistance meter. 

Micro-Ohm Meter

  Technical Features: