Insulation Coordination. The system design parameters for substations/switchyards shall be as given below:
Insulation Coordination. 1.4.1. Equipment connected to the transmission system shall be protected against lightning and switching surges. This shall include station shielding against direct lightning strokes, surge protection on all wound devices, and cable/overhead interfaces.
1.4.2. A tap connected to a shielded transmission circuit shall also be shielded.
1.4.3. The Transmitter shall review surge arrester ratings.
1.4.3.1. The Transmitter shall provide all relevant Information, e.g., ratings, to Customers upon request. The Transmitter, however is not responsible for the adequacy of design or correctness of the operation of any equipment or apparatus including the surge arrester(s).
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 765 kV 400 kV 765 kV 400 kV 2. Maximum voltage of the system (rms) 800 kV 420 kV 800 kV 420 kV 3. Rated frequency 50 Hz 50 Hz 50 Hz 50 Hz 4. No. of phases 3 3 3 3 5. Rated Insulation levels
Insulation Coordination. The system design parameters for substations/switchyards shall be as given below: 1. System operating voltage 765 kV 400 kV 765 kV 2. Maximum voltage of the system (rms) 800 kV 420 kV 800 kV 3. Rated frequency 50 Hz 50 Hz 50 Hz 4. No. of 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 2100 kVp 2100 kVp
ii) Switching Impulse Withstand Voltage (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 830 kV 6. Corona Extinction Voltage 508 kV 320 kV 508 kV 7. Max. radio interference voltage for frequency between 0.5 MHz and 2 MHz 2500 micro- volt at 508 kV rms 1000 micro- volt at 266 kV rms 2500 micro-volts at 508 kV rms
Insulation Coordination. The system design parameters for substations/switchyards shall be as given below: 1. System operating voltage 765 kV 400 kV 220 kV 765 kV 400 kV 2. Maximum voltage of the system (rms) 800 kV 420 kV 245 kV 800 kV 420 kV 3. Rated frequency 50 Hz 50 Hz 50 Hz 50 Hz 50 Hz 4. No. of phases 3 3 3 3 3 5. Rated Insulation levels
i) Lightning Impulse withstand voltage for (1.2/50 micro sec.) - for Equipment Other 2100 1425 1050 2100 kVp 1425 kVp than Transformer and kVp kVp kVp Reactor - for Insulator String 2100 kVp 1550 kVp 765 kV System 400 kV System 220 KV System 765 kV System 400 kV System 2100 kVp 1550 kVp 1050 kVp
ii) Switching impulse withstand voltage (250/2500 micro sec.) dry and wet 1550 kVp 1050 kVp 1550 kVp 1050 kVp
iii) One-minute power frequency dry withstand voltage (rms) 830 kV 630 kV 830 kV 630 xX
xx) One minute power frequency dry and wet withstand voltage (rms) -- -- 460 kV -- -- 6. Corona extinction voltage 508 kV 320 kV -- 508 kV 320 kV 7. Max. radio interference voltage for frequency between 0.5 MHz and 2 MHz 2500 micro- volts at 508 kV rms 1000 micro- volts at 266 kV rms 1000 micro- volts at 156kV rms 2500 micro- volts at 508 kV rms 1000 micro- volts at 266 kV rms
Insulation Coordination. The system design parameters for substations/switchyards shall be as given below: Sl. No. Description of parameters 765/400 kV Jamnagar (GIS) Extension of 400 kV Jam Khambhaliya (GIS) Extension of 765 kV Halvad (AIS) 765 kV System 400 kV System 400 kV System 765 kV System 1. System operating voltage 765 kV 400 kV 400 kV 765 kV
Insulation Coordination. Interconnection Customer shall coordinate the insulation level (BIL) of all interconnection facility equipment with the Transmission Provider and the over-voltage protection shall have Maximum Continuous Operating Voltage (MCOV) ratings consistent with expected system operating voltages. Special attention shall be given to MCOV ratings on systems subject to delta operation.
Insulation Coordination. The system design parameters for substations/switch yards shall be as given below: Sl No Description of parameters Augmentation of 765/400 kV Fatehgarh-II PS 765 kV System 400 kV System
1. System Operating Voltage 765 kV 400 kV 2. Maximum voltage of the system (rms) 800 kV 420 kV 3. Rated frequency 50 Hz 50 Hz 4. No. of 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 − for Insulator String 2100 kVp 2100 kVp 1425 kVp 1550 kVp
Insulation Coordination. The system design parameters for substations/switchyards shall be as given below:
1. System operating voltage 400 kV
2. Maximum voltage of the system (rms) 420 kV
3. Rated frequency 50 Hz
4. No. of phases 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
ii) Switching impulse withstand voltage (250/2500 micro sec.) dry and wet 1050 kVp
iii) One minute power frequency dry withstand voltage (rms) 650 xX
xx) One minute power frequency dry and wet withstand voltage (rms) -
