(10) Calculate Insulation Resistance Value and PI Value

Minimum IR Value for Rotating Machine (AC or DC)

Machine Terminal to Terminal Voltage 0.44 KVA

IR (Min) for Machine 1.44

Minimum IR Value for Transformer

Frequency 50 HzVoltage Rating of winding under Test 440 VoltRated Capacity of Winding under Test 1.6 KVASelect Type of TransformerTank Oil Filled T.C 1Without Tank Oil filled T.CDry or Compound Fill T.CIR (Min) for Transformer 521.8

Minimum IR Value for Cable

Type of Cable 1

Type of Insulation Material 3

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)) 25IR(min) value Excellent 2.00

Case-2 No of Outlet (All Point,Plugs without Fitting(Lamp etc)) 25IR(min) value Excellent 2.00

Jignesh.Parmar www.jiguparmar.com jiguparmar@yahoo.com

MINIMUM Insulation Resistance Value MINIMUM Insulation Resistance Value

50 Hz 25 Hz 21 1.5 12 30 203 30 20

1 Paper 26402 Varnished 24603 ThermoPlastic-Polyethylene 500004 Composite-Polyethylene 300005 Polyvinyle Chloride (60°C) 5006 Polyvinyle Chloride (75°C) 2000

50000 0

1 CoreMulticore

Name of EquipmentRated Voltage of Equipment 230 VoltRecommended Megger Size 100V DC or 250V DC

Reference Temperature (°C) 40

1-Jan-10 3 42 1.15 3.45 3.451-Feb-10 2 56 3.03 6.06 6.061-Mar-10 4 55 2.83 11.31 11.311-Apr-10 5 30 0.50 2.50 2.501-May-10 5 32 0.57 2.87 2.872-May-10 2 34 0.66 1.32 1.323-May-10 2 34 0.66 1.32 1.325-May-10 5 10 0.13 0.63 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 0.66

Measured IR Value (MΩ)

Temperature (°C)

Temperature Correction Factor

IR Value after Temperature Adjucment (MΩ)

1-Jan-10

2-Jan-10

3-Jan-10

4-Jan-10

5-Jan-10

6-Jan-10

7-Jan-10

8-Jan-10

9-Jan-10

1-Feb-10

2-Feb-10

3-Feb-10

4-Feb-10

5-Feb-10

6-Feb-10

7-Feb-10

8-Feb-10

9-Feb-10

10-Feb-10

11-Feb-10

12-Feb-10

13-Feb-10

14-Feb-10

15-Feb-10

16-Feb-10

17-Feb-10

18-Feb-10

19-Feb-10

20-Feb-10

21-Feb-10

22-Feb-10

23-Feb-10

24-Feb-10

25-Feb-10

26-Feb-10

27-Feb-10

28-Feb-10

1-Mar-10

2-Mar-10

3-Mar-10

4-Mar-10

5-Mar-10

6-Mar-10

7-Mar-10

8-Mar-10

9-Mar-10

10-Apr-10

11-Apr-10

12-Apr-10

13-Apr-10

14-Apr-10

15-Apr-10

16-Apr-10

17-Apr-10

18-Apr-10

19-Apr-10

20-Apr-10

21-Apr-10

22-Apr-10

23-Apr-10

24-Apr-10

25-Apr-10

26-Apr-10

27-Apr-10

28-Apr-10

29-Apr-10

30-Apr-10

1-May-10

2-May-10

3-May-10

4-May-10

5-May-10

6-May-10

7-May-10

8-May-10

9-May-10

12.00IR Value (MΩ)

Insulation Resistance Value measurementInsulation Resistance Value measurement

1-Jan-10 2 30 0.50 1.00 1.00

1-Jan-101-Feb-101-Mar-101-Apr-10

1-May-102-May-103-May-105-May-106-May-107-May-108-May-109-May-10

10-May-1011-May-1012-May-1013-May-10

2-Jan-10

1-Jan-10

2-Jan-10

3-Jan-10

4-Jan-10

5-Jan-10

6-Jan-10

7-Jan-10

8-Jan-10

9-Jan-10

1-Feb-10

2-Feb-10

3-Feb-10

4-Feb-10

5-Feb-10

6-Feb-10

7-Feb-10

8-Feb-10

9-Feb-10

10-Feb-10

11-Feb-10

12-Feb-10

13-Feb-10

14-Feb-10

15-Feb-10

16-Feb-10

17-Feb-10

18-Feb-10

19-Feb-10

20-Feb-10

21-Feb-10

22-Feb-10

23-Feb-10

24-Feb-10

25-Feb-10

26-Feb-10

27-Feb-10

28-Feb-10

1-Mar-10

2-Mar-10

3-Mar-10

4-Mar-10

5-Mar-10

6-Mar-10

7-Mar-10

8-Mar-10

9-Mar-10

10-Apr-10

11-Apr-10

12-Apr-10

13-Apr-10

14-Apr-10

15-Apr-10

16-Apr-10

17-Apr-10

18-Apr-10

19-Apr-10

20-Apr-10

21-Apr-10

22-Apr-10

23-Apr-10

24-Apr-10

25-Apr-10

26-Apr-10

27-Apr-10

28-Apr-10

29-Apr-10

30-Apr-10

1-May-10

2-May-10

3-May-10

4-May-10

5-May-10

6-May-10

7-May-10

8-May-10

9-May-10

12.00IR Value (MΩ)

1-Jan-10

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 DCInsulation Class

Reference Temperature (°C) 40

1-Jan-10 2 1 42 1.15 2.001-Feb-10 4 2 56 3.03 2.001-Mar-10 5 1 55 2.83 5.001-Apr-10 3 1 30 0.50 3.001-May-10 2 1 32 0.57 2.002-May-10 4 1 34 0.66 4.003-May-10 2 2 34 0.66 1.00

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 0.000.00 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

1-Jan-10 2 3 23 0.31 0.67

(for 10 Minitue)

(for 1 Minitue)

Temperature (°C)

Temperature Correction Factor

Polarization Index Number after Temperature Adjucment

POLARIZATION INDEX Value measurementPOLARIZATION INDEX Value measurement

Class A Class B Class C Class F Class H

Questionable 2.00 1-Jan-10Questionable 2.00 1-Feb-10

Excellent 5.00 1-Mar-10OK 3.00 1-Apr-10

Questionable 2.00 1-May-10OK 4.00 2-May-10

Poor 1.00 3-May-10

Poor 0.67 1-Jan-10

Insulation Condition

1-Jan-102-Jan-103-Jan-104-Jan-105-Jan-106-Jan-107-Jan-108-Jan-109-Jan-1010-Jan-1011-Jan-1012-Jan-1013-Jan-1014-Jan-1015-Jan-1016-Jan-1017-Jan-1018-Jan-1019-Jan-1020-Jan-1021-Jan-1022-Jan-1023-Jan-1024-Jan-1025-Jan-1026-Jan-1027-Jan-1028-Jan-1029-Jan-1030-Jan-1031-Jan-101-Feb-102-Feb-103-Feb-104-Feb-105-Feb-106-Feb-107-Feb-108-Feb-109-Feb-1010-Feb-1011-Feb-1012-Feb-1013-Feb-1014-Feb-1015-Feb-1016-Feb-1017-Feb-1018-Feb-1019-Feb-1020-Feb-1021-Feb-1022-Feb-1023-Feb-1024-Feb-1025-Feb-1026-Feb-1027-Feb-1028-Feb-101-Mar-102-Mar-103-Mar-104-Mar-105-Mar-106-Mar-107-Mar-108-Mar-109-Mar-1010-Mar-1011-Mar-1012-Mar-1013-Mar-1014-Mar-1015-Mar-1016-Mar-1017-Mar-1018-Mar-1019-Mar-1020-Mar-1021-Mar-1022-Mar-1023-Mar-1024-Mar-1025-Mar-1026-Mar-1027-Mar-1028-Mar-1029-Mar-1030-Mar-1031-Mar-101-Apr-102-Apr-103-Apr-104-Apr-105-Apr-106-Apr-107-Apr-108-Apr-109-Apr-1010-Apr-1011-Apr-1012-Apr-1013-Apr-1014-Apr-1015-Apr-1016-Apr-1017-Apr-1018-Apr-1019-Apr-1020-Apr-1021-Apr-1022-Apr-1023-Apr-1024-Apr-1025-Apr-1026-Apr-1027-Apr-1028-Apr-1029-Apr-1030-Apr-101-May-102-May-103-May-100.00

6.00PI Value

100200300400500600700800900

10001100120013001400150016001700180019002000210022002300240025002600270028002900300031003200330034003500360037003800390040004100

1-Jan-102-Jan-103-Jan-104-Jan-105-Jan-106-Jan-107-Jan-108-Jan-109-Jan-1010-Jan-1011-Jan-1012-Jan-1013-Jan-1014-Jan-1015-Jan-1016-Jan-1017-Jan-1018-Jan-1019-Jan-1020-Jan-1021-Jan-1022-Jan-1023-Jan-1024-Jan-1025-Jan-1026-Jan-1027-Jan-1028-Jan-1029-Jan-1030-Jan-1031-Jan-101-Feb-102-Feb-103-Feb-104-Feb-105-Feb-106-Feb-107-Feb-108-Feb-109-Feb-1010-Feb-1011-Feb-1012-Feb-1013-Feb-1014-Feb-1015-Feb-1016-Feb-1017-Feb-1018-Feb-1019-Feb-1020-Feb-1021-Feb-1022-Feb-1023-Feb-1024-Feb-1025-Feb-1026-Feb-1027-Feb-1028-Feb-101-Mar-102-Mar-103-Mar-104-Mar-105-Mar-106-Mar-107-Mar-108-Mar-109-Mar-1010-Mar-1011-Mar-1012-Mar-1013-Mar-1014-Mar-1015-Mar-1016-Mar-1017-Mar-1018-Mar-1019-Mar-1020-Mar-1021-Mar-1022-Mar-1023-Mar-1024-Mar-1025-Mar-1026-Mar-1027-Mar-1028-Mar-1029-Mar-1030-Mar-1031-Mar-101-Apr-102-Apr-103-Apr-104-Apr-105-Apr-106-Apr-107-Apr-108-Apr-109-Apr-1010-Apr-1011-Apr-1012-Apr-1013-Apr-1014-Apr-1015-Apr-1016-Apr-1017-Apr-1018-Apr-1019-Apr-1020-Apr-1021-Apr-1022-Apr-1023-Apr-1024-Apr-1025-Apr-1026-Apr-1027-Apr-1028-Apr-1029-Apr-1030-Apr-101-May-102-May-103-May-100.00

6.00PI Value

42004300440045004600470048004900500051006000700080009000

10000110001200013000

100V DC or 250V DC 100V DC or 250V DC 100V DC or 250V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC500V DC or 1000V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC

1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC1000V DC or 2500V DC2500V DC or 5000V DC2500V DC or 5000V DC2500V DC or 5000V DC2500V DC or 5000V DC2500V DC or 5000V DC2500V DC or 5000V DC2500V DC or 5000V DC2500V DC or 5000V DC2500V DC or 5000V DC50000V DC or 10000V DC

Date Remarks

1 1-Jan-10 1 02 2 03 5 04 10 05 15 06 25 07 50 0

Date Remarks

1 1 02 2 03 5 04 10 05 15 06 25 07 50 0

Date Remarks

1 1 02 2 03 5 04 10 05 15 06 25 07 50 0

Date Remarks

1 1 02 2 03 5 04 10 05 15 06 25 07 50 0

Date Remarks

1 1 02 2 03 5 0

Direction-I

Electrode Spacing (S)

(Meter)

Megger Rading in Ohms

Earth Resistivity Ohm-Meter

Direction-II

(Meter)

Earth Resistivity Ohm/Meter

Direction-III

(Meter)

Direction-IV

(Meter)

Direction-V

(Meter)

Earth Resistivity Value MeasurementEarth Resistivity Value Measurement

4 10 05 15 06 25 07 50 0

Date Remarks

1 1 02 2 03 5 04 10 05 15 06 25 07 50 0

Direction-VI

(Meter)

The Earth Resistance Value

Power StationEarth Tester/Megger (4 Terminals) EHT SubStation

66KV SuStationP1 P2 D.P Structure

Tower Foot Resistance

30 to 50 Cm

Location of Earth Resistivity Measurement

4 5 6 2

Earth Tester/Megger (3 Terminals)P

Jignesh.Parmar www.jiguparmar.com

jiguparmar@yahoo.com

75 Feet 75 Feet

The Earth Resistance Value

Power StationEHT SubStation66KV SuStationD.P Structure

Tower Foot Resistance

30 to 50 Cm

< 0.5Ω< 1.0Ω< 2.0Ω<5.0Ω

<10.0Ω

(10) Calculate Insulation Resistance Value and PI Value

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