ELECTRICAL TESTING OF DAMAGED / REPAIRED
TRANSFORMERS
TRANSFORMERS
1.
1. MEASUREMMEASUREMENT OF ENT OF WINDING RESISTANCEWINDING RESISTANCE a)
a) KELVIN BRIDEKELVIN BRIDE Measuring
Measuring Range -Range - 0.2 micro 0.2 micro ohm to 11 oohm to 11 ohm Accuracyhm Accuracy ±±0.05% micro or 0.05% micro or ±±1 slide wire1 slide wire
divn, which is greater rated current: Upto10 Amp. D.C. with light spot Galvanometer divn, which is greater rated current: Upto10 Amp. D.C. with light spot Galvanometer D.C. Power source of 6 V.
D.C. Power source of 6 V. 10 Amp. OVERALL DIMENSION: Length 430 mm, width 28010 Amp. OVERALL DIMENSION: Length 430 mm, width 280 mm, height 165 mm, galvanometer Length 280 mm, width 180 mm, Height 140 mm mm, height 165 mm, galvanometer Length 280 mm, width 180 mm, Height 140 mm b)
b) WHEAT STONE BRIDGEWHEAT STONE BRIDGE Measuring
Measuring Range -Range - 1 milli o1 milli ohm to 11hm to 11.11 mega o.11 mega ohms. Measuhms. Measuring Accuracyring Accuracy: within: within
±
±0.075%. Accuracy of series arm =0.075%. Accuracy of series arm = ±±0.05% w0.05% with null detecith null detector tor Galvanometer conGalvanometer conductor ductor
clamp and
clamp and 3 D.C. 3 D.C. cell of 1.5V. cell of 1.5V. each each OVERALL DIMENSION: Length 370 OVERALL DIMENSION: Length 370 mm, widthmm, width 260 mm, height 155 mm.
260 mm, height 155 mm.
2.
2. POLARITY CHECK & MEASUREMENPOLARITY CHECK & MEASUREMENT OF T OF VOLTAGE RATIOVOLTAGE RATIO TURN RATIO METER
TURN RATIO METER Measuring
Measuring Range Range -- 100-1000100-1000 10-100 10-100 1-10 1-10
Accuracy -0.1% Null balancing Type Accuracy -0.1% Null balancing Type
Mains operated with Polarity checking switch Mains operated with Polarity checking switch
3.
3. MEASUREMENT OF LOSSES AND IMPEDANCE VOLTAGEMEASUREMENT OF LOSSES AND IMPEDANCE VOLTAGE a)
a) VOLTMETERVOLTMETER Measuring
Measuring Range -Range - 0-150/300/600 0-150/300/600 V. AccuracyV. Accuracy ±±0.5% Portable Precision grade Moving0.5% Portable Precision grade Moving
Iron Low Powerfactor (0.2) A.C. Voltmeter in wooden case provided with Knife edge Iron Low Powerfactor (0.2) A.C. Voltmeter in wooden case provided with Knife edge pointer antiparallex mirror scale.
pointer antiparallex mirror scale. AMMETER
AMMETER
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85 85 Accuracy
Accuracy ±±0.5% 0.5% Measuring Measuring Scale Scale 0-300 0-300 WattsWatts
d)
d) CURRENT TRANSFORMERCURRENT TRANSFORMER Ratio:
Ratio: 10-15-30-50-10-15-30-50-100/5A 100/5A Rated Rated Burden Burden 15 15 VAVA Accuracy
Accuracy Class Class 0.2 0.2 Frequency Frequency 50 50 C/sC/s Voltage
Voltage Class Class 660 660 V V Effectively Effectively earthed earthed systemsystem Portable current Transformer in Teak Wood case Portable current Transformer in Teak Wood case e)
e) DIMMERSTAT (VARIAC)DIMMERSTAT (VARIAC) Con
Continuotinuously varusly variabliablee voltvoltage auto traage auto transformnsformer indoer indoor oil coolor oil cooled constred constructiuction,on, motorised with single phase supply portable type suitable to work on 3 phase 50 C/s motorised with single phase supply portable type suitable to work on 3 phase 50 C/s A.C. Supply with base ch
A.C. Supply with base channel & four wheels. annel & four wheels. Input: 415 Volts, 3 Phase, 50 C/s A.CInput: 415 Volts, 3 Phase, 50 C/s A.C Output: 0-470 Volts, 3 Phase, 50 C/s A.C
Output: 0-470 Volts, 3 Phase, 50 C/s A.C Capacity: 200 Amp.
Capacity: 200 Amp. f)
f) AUTO TRANSFORMERAUTO TRANSFORMER
Capacity: 200 KVA, 3 Phase oil cooled and having 2 Nos. Taps of 800 & 1200 Volts, Capacity: 200 KVA, 3 Phase oil cooled and having 2 Nos. Taps of 800 & 1200 Volts, input voltage 400
input voltage 400 Volts Volts with base with base channel & channel & four wheelsfour wheels g)
g) POWER CAPACITORSPOWER CAPACITORS Capacity : 100
Capacity : 100 KVAR KVAR Rated Voltage : 440 Rated Voltage : 440 V. ACV. AC 50 C/s, 3 Phase with internal delta connection 50 C/s, 3 Phase with internal delta connection h) h) FREQUENCY METER FREQUENCY METER Range 0-70 Hz. Range 0-70 Hz. i) i) STEP-UP TRANSFORMER STEP-UP TRANSFORMER
Capacity 100 KVA, Ratio 220 / 3000 volts with 2 Nos. tapping (150 & 300) in HV Side Capacity 100 KVA, Ratio 220 / 3000 volts with 2 Nos. tapping (150 & 300) in HV Side
4.
4. MEASUREMMEASUREMENT OF ENT OF INSULATION RESISTANCEINSULATION RESISTANCE INSULATION TESTER (MEGGER)
INSULATION TESTER (MEGGER) Voltage:2500 V.
Voltage:2500 V. Insulation Range: Insulation Range: 0-5000 meg. 0-5000 meg. ohmsohms Hand generator and metal body
Hand generator and metal body 5.
5. DIELECTRIC STRENGTH OF TRANSFORMER OIL (BREAK DOWN VOLTAGEDIELECTRIC STRENGTH OF TRANSFORMER OIL (BREAK DOWN VOLTAGE TEST OF TRANSFORMER OIL)
TEST OF TRANSFORMER OIL) OIL TESTING SET
OIL TESTING SET
Motorised, and switch controlled raise or lower the voltage at rate of 2 KV/second Motorised, and switch controlled raise or lower the voltage at rate of 2 KV/second (approx.) Input: 240 V, 50 C/s, Single phase Output: 0-100 KV 96 mm
(approx.) Input: 240 V, 50 C/s, Single phase Output: 0-100 KV 96 mm22 moving ironmoving iron meter marke
meter marked in KV wd in KV with memorith memory effect. y effect. Corona freCorona free acrylic type e acrylic type test cell withtest cell with electrodes, stirring facility, epoxy Treated oil cooled Transformer housed in fibre glass electrodes, stirring facility, epoxy Treated oil cooled Transformer housed in fibre glass tank, HV Chamber and Zero start inter locking, A fast acting D.C. relay provided to tank, HV Chamber and Zero start inter locking, A fast acting D.C. relay provided to
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protect the unit 2.4 mm/2.5 mm “GO”
protect the unit 2.4 mm/2.5 mm “GO” “NO GO” gauge for gap adjusting, Table mounting“NO GO” gauge for gap adjusting, Table mounting type with fibre glass tank
type with fibre glass tank for H.V. Transformer and metallic box for for H.V. Transformer and metallic box for control panel.control panel.
6.
6. HEAT RUN TESTHEAT RUN TEST a)
a) Stop WatchStop Watch b)
b) Thermometer 0-120Thermometer 0-120ooC (Stem Type)C (Stem Type) c)
c) All equipment used for All equipment used for measuremmeasurement of losses shall be ent of losses shall be reused here.reused here. 7.
7. INDUCED OVER VOLTAGE WITHSTAND TEST (DOUBLE FREQUENCY DOUBLEINDUCED OVER VOLTAGE WITHSTAND TEST (DOUBLE FREQUENCY DOUBLE VOLTAGE TEST)
VOLTAGE TEST) a)
a) SLIPRING INDUCTION MOTORSLIPRING INDUCTION MOTOR
3 Phase, 25 H.P. Slipring motor as generator and frequency changer 3 Phase, 25 H.P. Slipring motor as generator and frequency changer b)
b) Squirrel Cage Induction MotorSquirrel Cage Induction Motor 3 Phase, 10 H.P
3 Phase, 10 H.P Induction motor for primemover, auto Star Delta Starter Induction motor for primemover, auto Star Delta Starter c)
c) VOLTMETERVOLTMETER Moving
Moving IronIron A.C. VoltmeA.C. Voltmeter of 1ter of 1.5 class.5 class Accuracy Me
Accuracy Measuring Rasuring Range 0 -ange 0 - 1200 V.1200 V. d)
d) AMMETERAMMETER
Moving Iron A.C. Ammeter of
Moving Iron A.C. Ammeter of ±±1.5 Class1.5 Class
Accuracy, Measuring Range 0-80 A. Accuracy, Measuring Range 0-80 A. e)
e) FREQUENCY METERFREQUENCY METER
Accuracy class: 1.0 Measuring Range: 0-150 Accuracy class: 1.0 Measuring Range: 0-150 Hz.Hz.
f)
f) DIMMERSTAT (VARIAC)DIMMERSTAT (VARIAC)
Capacity 28 A, 3 Phase 50 Hz. 0-470 V, output Capacity 28 A, 3 Phase 50 Hz. 0-470 V, output g)
g) STEP-UP TRANSFORMERSTEP-UP TRANSFORMER
Range : 110V / 1100 V Range : 110V / 1100 V 8.
8. MEASUREMENT OF UNBALANCED CURRENTMEASUREMENT OF UNBALANCED CURRENT
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87 87 9.
9. SEPARATE SOURCE VOLTAGE WITHSTAND TEST (HIGH VOLTAGE TEST)SEPARATE SOURCE VOLTAGE WITHSTAND TEST (HIGH VOLTAGE TEST) a)
a) HIGH VOLTAGE HIGH VOLTAGE TRANSFORMETRANSFORMERR
Single phase oil cooled transformer: Input Voltage 220 Volts, Output Voltage: 0-40-80 Single phase oil cooled transformer: Input Voltage 220 Volts, Output Voltage: 0-40-80 KV, KVA Rating: 15
KV, KVA Rating: 15 b)
b) VOLTMETERVOLTMETER
Moving iron A.C. P.T. operated voltmeter accuracy
Moving iron A.C. P.T. operated voltmeter accuracy ±±1.5%, Range: 0-40/80 KV, P.T.1.5%, Range: 0-40/80 KV, P.T.
Ratio: 40-80 KV/220 V. Ratio: 40-80 KV/220 V. c)
c) AMMETERAMMETER
Moving Iron A.C. Ammeter Moving Iron A.C. Ammeter Accuracy Accuracy ±±0.5%0.5% Measuring Range: 0-20 A. Measuring Range: 0-20 A. d) d) DIMMERSTATDIMMERSTAT
Continuously variable voltage auto-transformer, indoor oil cooled, construction Continuously variable voltage auto-transformer, indoor oil cooled, construction motorised with single phase supply portable type suitable to work on single phase 50 motorised with single phase supply portable type suitable to work on single phase 50 C/s A.C. supply with base channel and four wheels Input: 240 Volts, single phase 50 C/s A.C. supply with base channel and four wheels Input: 240 Volts, single phase 50 C/s A.C.
C/s A.C.
Capacity: 60 Amp. / 28 A Capacity: 60 Amp. / 28 A 10.
10. SEPARATE SOURCE VOLTAGE WITHSTAND TEST(LOW VOLTAGE TEST)SEPARATE SOURCE VOLTAGE WITHSTAND TEST(LOW VOLTAGE TEST) HIGH VOLTAGE TRANSFORMER
HIGH VOLTAGE TRANSFORMER Single phase oil cooled Transformer Single phase oil cooled Transformer
Input voltage: 220 Volts, Output Voltage: 0-4 Input voltage: 220 Volts, Output Voltage: 0-4 KVKV 11.
11. DIGITAL POWER METER WITH DIGITAL POWER METER WITH HARMONIC ANALYSISHARMONIC ANALYSIS Voltage rating 600 Volts and Current rating 20 Amps.
Voltage rating 600 Volts and Current rating 20 Amps.
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