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Apart
from manufacturing the mentioned test sets, we also
manufacture equipment according to
specific requirements of
customer.
 SURGE COMPARISON TEST SET
CAPACITANCE & TAN-DELTA TEST SET FOR HIGH VOLTAGE EQUIPMENT
MILLIVOLT DROP TEST SET
INSULATION RESISTANCE CUM POLARISATION INDEX TEST KIT
MOTOR TEST BENCH FOR NO LOAD TEST
Surge
Comparison test set can be used to detect insulation defects,
winding faults in single and multi phases motor windings
without changing coil connections, based on the comparison
method, with a reference winding. The total voltage impressed
on the winding is peak-to-peak, which can be selected to any
required level by adjusting the output control and is read
directly from the waveform displayed on the CRT screen.
Distinct
waveforms give indications of various defects such as:
Turn
to turn short, Coil to coil short in same phase.
Phase to phase short, partial & complete.
Improper coil connections.
Reverse coil connections.
Open coil connections.
Short to ground partial & complete.
Input:
230V + 10%, 50Hz., single phase AC.
Output(s)
Series
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SGCNT2
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SGCNT2
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SGCNT2
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SGCNT1
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Type
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5KJ05J5
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10KJ05J5
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12KJ28J80
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24K11J5
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Test
voltage
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0-5KV
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0-10KV
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0-12KV
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0-24KV
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Output
energy
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Low
power:
0.025J
to 0.05J
High
power:
0.25J
to 0.5J
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Low
power:
0.025J
to 0.05J
High
power:
0.25J
to 0.5J
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Low
power: 0.28J
High
power:0.80J
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11.5J
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Display:
5’’
CRT oscilloscopic
Sweep width:
Variable
Sets of other test voltage and output energy can also be
manufactured at customer’s request.
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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.
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Series
:
STCCTD.
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Type
: 100P12K
100P20
1000P/12
1000P/20 10n12K
10n20K
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Capacitance
: 100PF+5%
100PF+5%
1000PF+5%
1000PF+5%
1nF+5%
10nF+5%
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Operating
voltage :
12KV 20KV
12KV
20KV 12KV
20KV
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Max.
voltage : 14.5KV
24KV
14.5KV
24KV
14.5KV
(1min)
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Frequency
of
: 50Hz
+
10%
operation
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Actual
value of
:
Actual value indicated on capacitor.
Capacitance
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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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MILLI
VOLT DROP TEST SET
This
is a portable DC Injection Set suitable to observe millivolt drop
across low resistance elements, contacts, switches, D.C. motor
commutator segments etc.
Input
: 230 volts, 50Hz, 1Phase, AC upto 300A.
400/415 V, three phase, 4 wire,
50Hz. , AC above 300A.
Output
: Continuously variable from zero to maximum rated current
required.
Series:
MVDTXPYYU;
X
denotes single phase input (1) or three phase input (3);
YY
denotes DR or OC i.e. either the transformer will be air-cooled or
oil cooled type.
U
denotes no. of units – either one (1) or two (2).
Type: Y1Y1Y1AZZV;
Y1Y1Y1
denotes the maximum current capacity in Amp.
While, for Y1KAZZV;
Y1 denotes the maximum current capacity in kAmp.
ZZ
denotes the open circuit voltage rating.
We manufacture these sets in wide range up to 3KA and of various
capacities.
Duty Cycle : 5 minutes ON & 10
mins. OFF. Sets of other duty cycle can also be manufactured
at
extra cost.
Units : 1 unit upto 500A.
2 units above 500A upto 3000A.
Transformer :
Air-cooled upto 1000A.
Oil cooled above 1000A upto 3000A.
Step down rectifier transformer with full wave rectifier bank
consists of 4 nos. silicon diodes along with
surge suppressor.
Protection
against overload & short circuit is provided.
“Zero Start Interlock” protection is also
incorporated.
Metering:
Analog millivoltmeter, voltmeter & shunt operated ammeter.
Digital meters can be provided at
extra cost.
One set of probes to measure millivolt drop between two
points of test sample is provided.
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INSULATION
RESISTANCE CUM POLARISATION INDEX TEST KIT
TYPE:
IRPI5KMN
This apparatus is perfectly suitable for diagnostic testing
i.e. insulation resistance and polarisation index,
of a wide variety of heavy duty electrical
equipment & system like transformers, high voltage
insulators,
power cables, motors, electrical installation etc.
Input
: 240 V +
10%, 50Hz. ( + 3%), single phase AC.
Output(s)
[a] Test voltages: Selectable
in four different ranges i.e. 500V, 1000V, 2500V and 5000V
DC.
Metering:
41/2 digital panel meter
[b] Resistance measurement done in analog
meter:
Voltage
Resistance range
500V
50 GΩ
1000V
100GΩ
2.50 kV
250GΩ
5.00 kV
500GΩ
Resistance
measurement done in digital meter:
50GΩ
for all test voltages.
[c]
Capacitance
measurement:
100 pF to 20.0 micro
farad
Metering:
31/2 digit module.
[d] Time measurement range
: 0 - 999.9 sec.
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MOTOR TEST BENCH FOR NO LOAD TEST FOR INDUCTION
MOTORS
Motor
Test Bench is capable of testing 3 phase, 50 c/s, 440 V Induction
motors providing the following scope of tests.
High
Voltage test upto 3 kV rms.
Capacity:
500 mA in the H.V. side with tripping at 100 mA, 250 mA & 500 mA.
Duty cycle: 5 mins. ON 5 mins. OFF
Insulation
test at 500 V DC & 1000V DC.
Performance
tests for induction motors at NO LOAD with application of
Rated
Input Voltage.
i. No load current characteristic.
ii. No load losses.
iii.
Speed of Motor can be checked by external tachometer (not in
scope of this contact).
The Test Bench can test-
Single
phase motors upto 30 kW Max. On D.O.L. Start.
3
Phase Motors upto 95 kW at 440 V (Line to Line) on D.O.L. Start.
3
phase Motors upto 110 kW at 440 V (Line to Line) on Start / Delta
Start.
Input: 3
phase, 50 c/s, 440 AC.
Interlocks are provided to make sure that only one test can be carried out at one time.
Similarly, only
one Motor to be tested at
one time. Off-load tap changing arrangements
are incorporated in the Test Bench.
Metering:
Voltmeter
with phase selector switch for applied terminal voltage (line to
line).
Voltmeter
to read the applied H.V. & milliammeter to read the tripping
current.
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