OPERATIONAL ENERGY GROUP INDIA PRIVATE LIMITED. A-5 th FLOOR, GOKUL ARCADE, EAST WI NG,No.2 SARDAR PATEL ROAD, ADAYAR CHEENAI 600 020

Temperature limits in junction (Switchyard):Good: Up to 35 degC Satisfactory: Between 35 to 45 degCUnsatisfactory: Between 45 to 65 degCUnacceptable: Greater than 65 degC

Temperature limits in junction (VFD):Good: Up to 55 degC Satisfactory: Between 55 to 65 degCUnsatisfactory: Between 65 to 75 degCUnacceptable: Greater than 75 degCTemperature limits in junction (Electrical Panel):Good: Up to 60 degC Satisfactory: Between 60 to 80 degCUnsatisfactory: Between 80 to 90 degCUnacceptable: Greater than 90 degC

Dear Sir,Herewith below I have listed out the abnormal arc temperature which found in SWITCHYARD (line 1&2, GT 1, 2&3). Please find the junction/connection and the looseness to be rectified.S NoEquipment NameTemperatureStatus

1Bay - 2 GT 1 Bay, 5 Core CT (R Phase)63 degCUnsatisfactory.

2Line 1 , 5 Core CT (Y Phase)61 degCUnsatisfactory.

3Line 1, Wave Draft (R Phase)61 degCUnsatisfactory.

4GT 2 Bay, 5 Core CT (R Phase)52 degCUnsatisfactory.

5Line 2 Bay, 89LE (Y Phase)52 deg CUnsatisfactory.

Dear Sir,Herewith below I have listed out the abnormal arc temperature which found in VFD DRIVES (Unit I, II&III). Please verify the junction/connection for looseness to be rectified.

S NoEquipment NameTemperatureStatus

1SA 1B Disconnect Switch output (R Phase)69 degCUnsatisfactory.

2SA 1B Disconnect Switch output (Y Phase)93 degCUnacceptable.

3PA 1B Slave Drive Output (R Phase)66 degCUnsatisfactory.

4PA 1B Slave Drive Output (Y Phase)66 degCUnsatisfactory.

5PA 1B Disconnect Switch output (R Phase)72 degCUnsatisfactory.

6PA 2B Disconnect Switch input (Y Phase)72 degCUnsatisfactory.

7ID 3A Disconnect Switch input (B Phase)67 degCUnsatisfactory.

8PA 3A Slave Drive input (B Phase)73 degCUnsatisfactory.

9PA 3B Disconnect Switch output (Y Phase)78 degCUnacceptable.

S NoEquipment NameTemperatureStatus

1Unit I, ACC 14, High Speed Switch input (B Phase)173 degCUnacceptable.

2Unit II, ACC 1, High Speed Switch output (R Phase)88 degCUnsatisfactory.

3Unit II, ACC 1, High Speed Switch output (Y Phase)84 degCUnsatisfactory.

4Unit II, ACC 2,Output cable to motor (R Phase)101 degCUnacceptable.

5Unit II, ACC 6, High Speed Switch output (R Phase)118 degCUnacceptable.

6Unit II, ACC 6, High Speed Switch output (Y Phase)103 degCUnacceptable.

7Unit II, ACC 6,Output cable to motor (Y Phase)91 degCUnacceptable.

8Unit II, ACC 8, High Speed Switch output (R Phase)95 degCUnacceptable.

9Unit II, ACC 9, High Speed Switch output (Y Phase)81 degCUnsatisfactory.

10Unit II, ACC 9, High Speed Switch output (B Phase)84 degCUnsatisfactory.

11Unit II, ACC 11, High Speed Switch output (Y Phase)128 degCUnacceptable.

12Unit II, ACC 11, High Speed Switch output (B Phase)208 degCUnacceptable.

13Unit II, ACC 12, High Speed Switch output (Y Phase)111 degCUnacceptable.

14Unit II, ACC 13, High Speed Switch output (R Phase)174 degCUnacceptable.

15Unit II, ACC 13, High Speed Switch output (Y Phase)172 degCUnacceptable.

16Unit III, ACC 1, High Speed Switch input (R Phase)167 degCUnacceptable.

17Unit III, ACC 8, High Speed Switch input (B Phase)158 degCUnacceptable.

18Unit III, ACC 10, SFU Fuse output (Y Phase)104 degCUnacceptable.

19Unit III, ACC 11, SFU Fuse output (B Phase)93 degCUnacceptable.

20Unit III, ACC 11, High Speed Switch input (R Phase)159 degCUnacceptable.

21ACWP 3A SFU Fuse input (R Phase)209 degCUnacceptable.