calculo - insulation resistance(22.8.12)
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Minimum IR Value for Rotating Machine (AC or DC)
Machine Terminal to Terminal Voltage
IR (Min) for Machine
Minimum IR Value for Transformer
FrequencyVoltage Rating of winding under TestRated Capacity of Winding under TestSelect Type of TransformerTank Oil Filled T.CWithout Tank Oil filled T.CDry or Compound Fill T.CIR (Min) for Transformer
Minimum IR Value for Cable
Type of Cable
Type of Insulation Material
Outer Diameter of Conductor InsulationDiameter of Conductor
IR (Min) for Cable
Minimum IR Value for Domestic Wiring
Case-1 No of Outlet (All Point,Plugs with Fitting(Lamp etc))IR(min) value Excellent
Case-2 No of Outlet (All Point,Plugs without Fitting(Lamp etc))IR(min) value Excellent
MINIMUM Insulation Resistance Value MINIMUM Insulation Resistance Value
Minimum IR Value for Rotating Machine (AC or DC)
0.44 KVA
1.44
Minimum IR Value for Transformer
50 Hz440 Volt1.6 KVA
1
521.8
Minimum IR Value for Cable
1
3
0
Minimum IR Value for Domestic Wiring
252.00
252.00
Jignesh.Parmar, www.electricalnotes.wordpress.com jiguparmar@yahoo.com
MΩ
MΩ
MΩ
MΩ
MΩ
MINIMUM Insulation Resistance Value MINIMUM Insulation Resistance Value
50 Hz 25 Hz 21 1.5 12 30 203 30 20
1.5
1 Paper 2640 1 Core2 Varnished 2460 Multicore3 ThermoPlastic-Polyethylene 500004 Composite-Polyethylene 300005 Polyvinyle Chloride (60°C) 5006 Polyvinyle Chloride (75°C) 2000
50000 0
Name of EquipmentRated Voltage of Equipment 230Recommended Megger Size 100V DC or 250V DC
Reference Temperature (°C) 40
Date
1-Jan-10 3 42 1.15 3.451-Feb-10 2 56 3.03 6.061-Mar-10 4 55 2.83 11.311-Apr-10 5 30 0.50 2.501-May-10 5 32 0.57 2.872-May-10 2 34 0.66 1.323-May-10 2 34 0.66 1.325-May-10 5 10 0.13 0.636-May-10 0.00 0.007-May-10 0.00 0.008-May-10 0.00 0.009-May-10 0.00 0.00
10-May-10 0.00 0.0011-May-10 0.00 0.0012-May-10 0.00 0.0013-May-10 0.00 0.00
0.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.000.00 0.00
2-Jan-10 2 24 0.33 0.66
Measured IR Value (MΩ)
Temperature (°C)
Temperature Correction Factor
IR Value after Temperature Adjucment (MΩ)
Insulation Resistance Value measurementInsulation Resistance Value measurement
1-Jan-10 2 30 0.50 1.00
Volt
3.45 1-Jan-106.06 1-Feb-10
11.31 1-Mar-102.50 1-Apr-102.87 1-May-101.32 2-May-101.32 3-May-100.63 5-May-10
6-May-107-May-108-May-109-May-10
10-May-1011-May-1012-May-1013-May-10
0.66 2-Jan-10
Jignesh.Parmar, www.electricalnotes.wordpress.com, jiguparmar@yahoo.com
1-Jan-1
01-F
eb-1
01-M
ar-
10
1-A
pr-
10
1-M
ay-
10
2-M
ay-
10
3-M
ay-
10
5-M
ay-
10
6-M
ay-
10
7-M
ay-
10
8-M
ay-
10
9-M
ay-
10
10-M
ay-
10
11-M
ay-
10
12-M
ay-
10
13-M
ay-
10
2-Jan-1
01-Jan-1
0
0.00
2.00
4.00
6.00
8.00
10.00
12.00IR Value (MΩ)
Insulation Resistance Value measurementInsulation Resistance Value measurement
1.00 1-Jan-10
Jignesh.Parmar, www.electricalnotes.wordpress.com, jiguparmar@yahoo.com
1-Jan-1
01-F
eb-1
01-M
ar-
10
1-A
pr-
10
1-M
ay-
10
2-M
ay-
10
3-M
ay-
10
5-M
ay-
10
6-M
ay-
10
7-M
ay-
10
8-M
ay-
10
9-M
ay-
10
10-M
ay-
10
11-M
ay-
10
12-M
ay-
10
13-M
ay-
10
2-Jan-1
01-Jan-1
0
0.00
2.00
4.00
6.00
8.00
10.00
12.00IR Value (MΩ)
100 100V DC or 250V DC
200 100V DC or 250V DC300 100V DC or 250V DC
400 500V DC or 1000V DC500 500V DC or 1000V DC600 500V DC or 1000V DC700 500V DC or 1000V DC800 500V DC or 1000V DC900 500V DC or 1000V DC
1000 500V DC or 1000V DC1100 500V DC or 1000V DC1200 500V DC or 1000V DC1300 500V DC or 1000V DC1400 500V DC or 1000V DC1500 500V DC or 1000V DC1600 500V DC or 1000V DC1700 500V DC or 1000V DC1800 500V DC or 1000V DC1900 500V DC or 1000V DC2000 500V DC or 1000V DC2100 500V DC or 1000V DC2200 500V DC or 1000V DC2300 500V DC or 1000V DC2400 500V DC or 1000V DC2500 1000V DC or 2500V DC2600 1000V DC or 2500V DC2700 1000V DC or 2500V DC2800 1000V DC or 2500V DC2900 1000V DC or 2500V DC3000 1000V DC or 2500V DC3100 1000V DC or 2500V DC3200 1000V DC or 2500V DC3300 1000V DC or 2500V DC3400 1000V DC or 2500V DC3500 1000V DC or 2500V DC3600 1000V DC or 2500V DC3700 1000V DC or 2500V DC3800 1000V DC or 2500V DC3900 1000V DC or 2500V DC4000 1000V DC or 2500V DC4100 1000V DC or 2500V DC4200 1000V DC or 2500V DC
4300 1000V DC or 2500V DC4400 1000V DC or 2500V DC4500 1000V DC or 2500V DC4600 1000V DC or 2500V DC4700 1000V DC or 2500V DC4800 1000V DC or 2500V DC4900 1000V DC or 2500V DC5000 2500V DC or 5000V DC5100 2500V DC or 5000V DC6000 2500V DC or 5000V DC7000 2500V DC or 5000V DC8000 2500V DC or 5000V DC9000 2500V DC or 5000V DC
10000 2500V DC or 5000V DC11000 2500V DC or 5000V DC12000 2500V DC or 5000V DC13000 50000V DC or 10000V DC
Name of Equipment adwaRated Voltage of Equipment 440Recommended Megger 500V DC or 1000V DC
Insulation Class
Reference Temperature (°C) 40
Date
1-Jan-10 2 1 42 1.151-Feb-10 4 2 56 3.031-Mar-10 5 1 55 2.831-Apr-10 3 1 30 0.501-May-10 2 1 32 0.572-May-10 4 1 34 0.663-May-10 2 2 34 0.665-Jun-11 3 4 42 1.15
0.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.00
1-Jan-10 2 3 23 0.31
Measured IR Value (MΩ) (for 10
Minitue)
Measured IR Value (MΩ) (for 1
Minitue)
Temperature (°C)
Temperature Correction Factor
POLARIZATION INDEX Value measurementPOLARIZATION INDEX Value measurement
Class A Class B Class C Class F
adwa440 Volt
500V DC or 1000V DC
1
2.00 Questionable 2.00 1-Jan-102.00 Questionable 2.00 1-Feb-105.00 Excellent 5.00 1-Mar-103.00 OK 3.00 1-Apr-102.00 Questionable 2.00 1-May-104.00 OK 4.00 2-May-101.00 Poor 1.00 3-May-100.75 Poor 0.75 5-Jun-11
0.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.67 Poor 0.67 1-Jan-10
Jignesh.Parmar, www.electricalnotes.wordpress.com jiguparmar@yahoo.com
Polarization Index Number after Temperature Adjucment
Insulation Condition
0.00
1.00
2.00
3.00
4.00
5.00
6.00PI Value
POLARIZATION INDEX Value measurementPOLARIZATION INDEX Value measurement
Class F Class H
Jignesh.Parmar, www.electricalnotes.wordpress.com jiguparmar@yahoo.com
0.00
1.00
2.00
3.00
4.00
5.00
6.00PI Value
100 100V DC or 250V DC200 100V DC or 250V DC300 100V DC or 250V DC400 500V DC or 1000V DC500 500V DC or 1000V DC600 500V DC or 1000V DC700 500V DC or 1000V DC800 500V DC or 1000V DC900 500V DC or 1000V DC
1000 500V DC or 1000V DC1100 500V DC or 1000V DC1200 500V DC or 1000V DC1300 500V DC or 1000V DC1400 500V DC or 1000V DC1500 500V DC or 1000V DC1600 500V DC or 1000V DC1700 500V DC or 1000V DC1800 500V DC or 1000V DC1900 500V DC or 1000V DC2000 500V DC or 1000V DC2100 500V DC or 1000V DC2200 500V DC or 1000V DC2300 500V DC or 1000V DC2400 500V DC or 1000V DC2500 1000V DC or 2500V DC2600 1000V DC or 2500V DC2700 1000V DC or 2500V DC2800 1000V DC or 2500V DC2900 1000V DC or 2500V DC3000 1000V DC or 2500V DC3100 1000V DC or 2500V DC3200 1000V DC or 2500V DC3300 1000V DC or 2500V DC3400 1000V DC or 2500V DC3500 1000V DC or 2500V DC3600 1000V DC or 2500V DC3700 1000V DC or 2500V DC3800 1000V DC or 2500V DC3900 1000V DC or 2500V DC4000 1000V DC or 2500V DC
4100 1000V DC or 2500V DC4200 1000V DC or 2500V DC4300 1000V DC or 2500V DC4400 1000V DC or 2500V DC4500 1000V DC or 2500V DC4600 1000V DC or 2500V DC4700 1000V DC or 2500V DC4800 1000V DC or 2500V DC4900 1000V DC or 2500V DC5000 2500V DC or 5000V DC5100 2500V DC or 5000V DC6000 2500V DC or 5000V DC7000 2500V DC or 5000V DC8000 2500V DC or 5000V DC9000 2500V DC or 5000V DC
10000 2500V DC or 5000V DC11000 2500V DC or 5000V DC12000 2500V DC or 5000V DC13000 50000V DC or 10000V DC
Direction-I Date
1 1-Jan-10 1 02 2 03 5 04 10 05 15 06 25 07 50 0
Direction-II Date
1 1 02 2 03 5 04 10 05 15 06 25 07 50 0
Direction-III Date
1 1 02 2 03 5 04 10 05 15 06 25 07 50 0
Direction-IV Date
1 1 02 2 03 5 04 10 05 15 06 25 07 50 0
Direction-V Date
1 1 02 2 03 5 0
Electrode Spacing (S)
(Meter)
Megger Rading in Ohms
Earth Resistivity Ohm-Meter
Electrode Spacing (S)
(Meter)
Megger Rading in Ohms
Earth Resistivity Ohm/Meter
Electrode Spacing (S)
(Meter)
Megger Rading in Ohms
Earth Resistivity Ohm/Meter
Electrode Spacing (S)
(Meter)
Megger Rading in Ohms
Earth Resistivity Ohm/Meter
Electrode Spacing (S)
(Meter)
Megger Rading in Ohms
Earth Resistivity Ohm/Meter
Earth Resistivity Value MeasurementEarth Resistivity Value Measurement
4 10 05 15 06 25 07 50 0
Direction-VI Date
1 1 02 2 03 5 04 10 05 15 06 25 07 50 0
Electrode Spacing (S)
(Meter)
Megger Rading in Ohms
Earth Resistivity Ohm/Meter
Earth Tester/Megger (4 Terminals)
P1
Remarks
C1
Remarks
S S
Location of Earth Resistivity Measurement
Remarks
4 5
Remarks
Earth Tester/Megger (3 Terminals)
E
Remarks
Jignesh.Parmar, www.electricalnotes.wordpress.com, jiguparmar@yahoo.com
Earth Resistivity Value MeasurementEarth Resistivity Value Measurement
75 Feet
Remarks
The Earth Resistance Value
Power StationEarth Tester/Megger (4 Terminals) EHT SubStation
66KV SuStationP2 D.P Structure
Tower Foot Resistance
C2
30 to 50 Cm
S S
Location of Earth Resistivity Measurement
1
5 6 2
3
Earth Tester/Megger (3 Terminals)P
C
< 0.5Ω< 1.0Ω< 2.0Ω<5.0Ω
<10.0Ω
75 Feet 75 Feet
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