|
Apart
from manufacturing the mentioned test sets, we also
manufacture equipment according to
specific requirements of
customer.
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.
-----------Back
to Top-----------
DC HIGH VOLTAGE TEST SET
|
DC High
Voltage Test Set
( Cascaded Type))
|
DC High Voltage Test Set
( In Two Units)
|
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.
-----------Back
to Top-----------
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:
|
Mode
of operation
|
Type
|
Maximum
output(In kV)
with center point of H.V.winding grounded
|
|
Manually
operated
|
OTMN050S
OTMN060S
OTMN070S
OTMN075S
OTMN080S
OTMN090S
OTMN100S
OTMN120S
|
50
60
70
75
80
90
100
120
|
|
Motor
operated
|
OTMT050S
OTMT060S
OTMT070S
OTMT075S
OTMT080S
OTMT090S
OTMT100S
OTMT120S
|
50
60
70
75
80
90
100
120 |
|
Microcontroller/Microprocessor
based Fully Automatic
|
OTAU050S
OTAU060S
OTAU070S
OTAU075S
OTAU080S
OTAU090S
OTAU100S
OTAU120S
|
50
60
70
75
80
90
100
120
|
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.
-----------Back
to Top-----------
“NTPL”
make 3KV or 5KV AC High Voltage Test Set is ideal for testing of Breakdown/withstand test of electrical & electronic components etc.
|
AC High
Voltage Breakdown Test Set
|
Input
: 230V +10%, 50Hz., 1 phase AC.
Output
: (Type:
BDVMN03S) continuously variable from 0 to 3KV and
(Type:
BDVMN05S) continuously variable from 0 to 5KV.
Capacity
:
50mA maximum in the H.V. side.
Tripping Current :
Tripping current can be adjusted at 25mA & 50mA.
Duty
:
Intermittent i.e. 5 minutes “ON” & 5 minutes
“OFF”.
H.V.
Transformer:
H.V.
Transformer used in the Test set will be cast resin type.
Protection:
Snap
acting automatic tripping of H.V. circuit in case of overload of
sample under test. Zero start interlocking will be provided.
Metering :
Analog
type voltmeter & milliammeter.
Mode of
operation:
Sets will be manually operated.
Features
that can be provided at extra cost:
Tripping set other than standard setting
Digital
Metering
-----------Back
to Top-----------
AC AND DC COMBINED HIGH VOLTAGE TEST SET
The above test set is suitable to perform AC High Voltage Power Frequency test on transformers, motors, cables etc. Leakage current can be
measured at desired pressure and this set can be used as a source for
cable fault burning.
AC
& DC Combined Test Set |
Input :
230 volts, 50 Hz., single phase, AC. However, sets with other input voltage &
frequency are also manufactured if mentioned by the customer.
Output(s)
AC Mode : Continuously variable from 0 to maximum rated output voltage.
Spread over a wide range from several VA to hundreds of KVA.
Tripping current: 25%, 50% & 100% of the rated current capacity.
DC Mode : Continuously variable from 0 to maximum rated output voltage.
This DC HV output can be suitably used in two modes.
They are: -
1) Cable fault-burning mode.
2) Cable insulation testing mode.
Only one output mode will be available at a time by brief manual change
over.
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.
Series: ADHVXXYYU; XX denotes Manual operation of the set (MN) or Motor
operation of the
set (MT).
YY denotes type of transformer i.e. cast resin type (DR)
or oil cooled type (OC).
U denotes no. of units.
This Series will be repeated for both AC & DC mode as Series1 & Series
2
Type1: X1X1X1KY1Y1Y1
m; X1X1X1
denotes the maximum rated AC output
voltage.
Y1Y1Y1
denotes the current capacity in mA.
X1X1X1KY1Y1Y1
A; Y1Y1Y1
denotes the current capacity in Amp.
Type2: X2X2X2KY2Y2Y2
m; X2X2X2
denotes the maximum rated DC output
voltage.
Y2Y2Y2
denotes the current capacity in mA.
Protection: Overload & short circuit provided. Zero start interlocking
along with Overvoltage
alarm & indication are provided.
Metering
AC mode: Voltmeter, Rectifier type milliammeter.
DC mode: Micro-ammeter scaled and connected to the HV resistor chain
for direct DC HV
measurement.
DC milliammeter to measure DC leakage / burning current
HV Transformer:
The Transformer will be indoor pattern cast resin trolley mounted type with one end of the HV winding earthen through low impedance circuit element.
Rectifier unit:
This unit consists of diode chain, filter capacitors and resistor chain. The whole DC circuit element will be coupled to the transformer &
control by simple & short manual operation.
Discharge rod: A discharge rod is provided with the set.
-----------Back
to Top-----------
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: 31/2 digital panel meter.
-----------Back
to Top-----------
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 Cx 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:
31/2
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.
| 
.