Common use of Insulation Coordination Clause in Contracts

Insulation Coordination. The system design parameters for substations/switchyards shall be as given below: 1. System Operating Voltage 400 kV 220 kV 2. Maximum voltage of the system (rms) 420 kV 245 kV 3. Rated Frequency 50 Hz 50 Hz 4. No. of Phases 3 3 5. Rated Insulation levels i) Lightning Impulse withstand voltage for (1.2/50 micro sec.) - for Equipment other than Transformer and Reactor - for Insulator String 1425 kVp 1550 kVp 1050 kVp 1050 kVp ii) Switching Impulse withstand voltage (250/2500 micro sec.) dry and wet 1050 kVp - iii) One minute power frequency dry withstand voltage (rms) 650 kV - iv) One minute power frequency dry and wet withstand voltage (rms) - 460 kV

Insulation Coordination. The system design parameters for substations/switchyards shall be as given below: : 1. System Operating Voltage 400 kV 220 kV operating voltage 765kV 765kV 2. Maximum voltage of the system (rms) 420 kV 245 kV 800kV 800kV 3. Rated Frequency 50 Hz 50 Hz frequency 50Hz 50Hz 4. No. of Phases phase 3 3 5. Rated Insulation levels i) Lightning Impulse withstand voltage for (1.2/50 micro sec.) - for Equipment other than Transformer and Reactor Reactors - for Other Equipment - for Insulator String 1425 kVp 1550 kVp 1050 kVp 1050 kVp1950kVp 2100kVp 2100kVp 1950kVp 2100kVp 2100kVp ii) Switching Impulse impulse withstand voltage (250/2500 micro sec.) dry and wet 1050 kVp -1550kVp 1550kVp iii) One minute power frequency dry withstand voltage (rms) 650 kV - 830kV 830kV iv) One minute power frequency dry and wet withstand voltage (rms) - 460 kV-

Insulation Coordination. The system design parameters for substations/switchyards shall be as given below: 1. System Operating Voltage 765 kV 400 kV 220 kV 2. Maximum voltage of the system (rms) 800 kV 420 kV 245 kV 3. Rated Frequency frequency 50 Hz 50 Hz 50 Hz 4. No. of Phases phases 3 3 3 5. Rated Insulation levels i) Lightning Impulse withstand voltage for (1.2/50 micro sec.) - for Equipment other than Transformer and Reactor - for Insulator String 2100 kVp 2100 kVp 1425 kVp 1550 kVp 1050 kVp 1050 kVp ii) Switching Impulse withstand voltage (250/2500 micro sec.) dry and wet 1425 kVp 1050 kVp - iii) One minute power frequency dry withstand voltage (rms) 960 kV 650 kV - iv) One minute power frequency dry and wet withstand voltage (rms) - - 460 kV

Insulation Coordination. The system design parameters for substations/switchyards shall be as given below: 1. System Operating Voltage operating voltage 765 kV 400 kV 220 765 kV 2. Maximum voltage of the system (rms) rm 800 kV 420 kV 245 800 kV 3. Rated Frequency frequency 50 Hz 50 Hz 50 Hz 4. No. of Phases phases 3 3 3 5. Rated Insulation levels i) Lightning Impulse withstand voltage voltag for (1.2/50 micro sec.) - for Equipment other than Transformer and Reactor reactor - for Insulator String 2100 kVp 2100 kVp 1425 kVp 1550 kVp 1050 2100 kVp 1050 2100 kVp ii) Switching Impulse impulse withstand voltage voltag (250/2500 micro sec.) dry and wet 1425 kVp 1050 kVp -1550 kVp iii) One minute power frequency dry withstand voltage (rms) 960 kV 650 kV - iv) One minute power frequency dry and wet withstand voltage (rms) - 460 830 kV

Insulation Coordination. The system design parameters for substations/switchyards shall be as given below: : 1. System Operating Voltage 400 kV 220 kV operating voltage 400kV 220kV 2. Maximum voltage of the system (rms) 420 kV 245 kV 420kV 245kV 3. Rated Frequency 50 Hz 50 Hz frequency 50Hz 50Hz 4. No. of Phases phase 3 3 3 5. Rated Insulation levels levels i) Lightning Lighting Impulse withstand voltage for voltagefor (1.2/50 micro sec.) - for Equipment other than Transformer and Reactor Reactors - for Insulator String 1425 kVp 1550 kVp 1050 kVp 1050 kVp 1425kVp 1550kVp 1050kVp 1050kVp ii) Switching Impulse impulse withstand voltage (250/2500 micro sec.) dry and wet 1050 kVp 1050kVp - iii) One minute power frequency dry withstand voltage (rms) 650 kV - iv) One minute power frequency dry and wet withstand voltage (rms) - 460 kV

Insulation Coordination. The system design parameters for substations/substations/ switchyards shall be as given below: : 1. System Operating Voltage 400 kV 220 kV operating voltage 765kV 765kV 2. Maximum voltage of the system (rms) 420 kV 245 kV 800kV 800kV 3. Rated Frequency 50 Hz 50 Hz frequency 50Hz 50Hz 4. No. of Phases phase 3 3 5. Rated Insulation levels i) Lightning Impulse withstand voltage for (1.2/50 1.2/ 50 micro sec.) - for Equipment other than Transformer and Reactor - Reactors for Other Equipment for Insulator String 1425 kVp 1550 kVp 1050 kVp 1050 kVp1950kVp 2100kVp 2100kVp 1950kVp 2100kVp 2100kVp ii) Switching Impulse impulse withstand voltage (250/2500 250/ 2500 micro sec.) dry and wet 1050 kVp -1550kVp 1550kVp iii) One minute power frequency dry withstand voltage (rms) 650 kV - 830kV 830kV iv) One minute power frequency dry and wet withstand voltage (rms) - 460 kV-

Insulation Coordination. The system design parameters for substations/switchyards shall be as given below: : 1. System Operating Voltage 400 kV 220 kV operating voltage 765kV 400kV 765kV 2. Maximum voltage of the system (rms) 420 kV 245 kV 800kV 420kV 800kV 3. Rated Frequency 50 Hz 50 Hz frequency 50Hz 50Hz 50Hz 4. No. of Phases phase 3 3 3 5. Rated Insulation levels i) Lightning Impulse withstand voltage for (1.2/50 micro sec.) - for Other Equipment other than Transformer and Reactor - for Insulator String 1425 kVp 1550 kVp 1050 kVp 1050 kVp2100kVp 2100kVp 1425kVp 1550kVp 2100kVp 2100kVp ii) Switching Impulse impulse withstand voltage (250/2500 micro sec.) dry and wet 1050 kVp - 1425kVp 1050kVp 1550kVp iii) One minute power frequency dry withstand voltage 960kV 650kV 830kV 765 kV System 400 kV System 765 kV System (rms) 650 kV - iv) One minute power frequency dry and wet withstand voltage (rms) - 460 kV- -