Common use of Protection Requirements Clause in Contracts

Protection Requirements. 1.2.1. The typical technical requirements for Distributor and Consumer protection shall be followed, as presented in Exhibit E.1 of Schedule E and Exhibits F.1 and F.2 of this Schedule F. 1.2.2. Line protections are required when transformers connected to separate supply circuits are operated in parallel on the low-voltage side, or if a large synchronous infeed exists at the low-voltage bus. 1.2.3. Directional current sensing relays may be required to detect infeed into faults within the transmission system and isolate the Customer’s contribution to the fault. Distance or impedance (21) relays as specified in Exhibit F.2 of this Schedule F, usually serve this need. 1.2.4. If the transformer is connected ungrounded wye or delta on the primary, then ground undervoltage (64-27) and ground overvoltage (64-59) protections as shown in Exhibit F.2 of this Schedule F are required to detect ground faults. 1.2.5. Where the Transmitter has accepted transformers connected wye-grounded on the primary (Yg/D or Yg/Yg), a ground-overcurrent relay (64) as indicated in Exhibit F.2 of this Schedule F, connected in the transformer neutral, may be used for detection. 1.2.6. Where remote/transfer trip circuits are used for transformer faults to trip the Transmitter’s line breakers at the terminal stations, the Customer shall use a motor-operated transformer disconnect switch at its station to provide a point of separation from the transmission system. Energization of remote/transfer trip and opening of the disconnect switch (89) shall be initiated simultaneously from the protection circuits. Full opening of the disconnect switch shall block sending of remote trip. 1.2.7. For a DC remote trip on a 115-kV system, the Customer shall provide all necessary equipment associated with one monitored teleprotection channel between its station and one of the supply terminal stations or tapped stations. Industry standard relays and associated equipment that is compatible with the Transmitter’s remote trip equipment shall be used. A 115-kV transfer trip shall have a similar requirement, except that audio- tone equipment shall be used instead of the DC battery voltage. 1.2.8. For a DC remote trip on a 230-kV system, the Customer shall provide all necessary equipment associated with two monitored teleprotection channels between its station and one of the supply terminal stations or tapped transformer stations. Normally two circuits in the same cable would be acceptable, but two separate cables going by and following separate routes may be required. The Customer shall use industry standard relays and associated equipment that is compatible with the Transmitter’s remote trip equipment. A 230-kV transfer trip shall have a similar requirement, except that audio-tone equipment shall be used instead of the DC battery voltage. Exhibit F.1 Typical Single-Line Protection Requirements Transmission System HV Line X0 *** X XXXX XX / XX ** Transformer winding configuration will A87 T1 determine type of ground protection B87 *X F Load NOTES: * System security may dictate two transformer differential Drawing does not indicate customer protections protections. If not required, a HV backup relay, 51B, is downstream from the transformer secondary breaker acceptable provided satisfactory setting can be applied. ** RT/TT may require duplication *** M ay be included as integral part of HVI. Typical Protection Requirements - 115 or 230kV Single Line Supply Exhibit F.2 Typical Two Line Protection Requirements Transmission System HV Line L1 L1 L2 L2 *** *** F HVI HVI F H RT / TT ** H CVT’s 21-64-L1 or 64-27-L1 Requirement for 64-59-L1 T2 and L2 are similar to T1 & L1 21-L1 A87 Transformer Winding * T1 Configuration will T2 B87 determine type of ground protection X X F F N.C. Bus Tie Load NOTES: * System security may dictate two transformer differential Drawing does not indicate customer protections protections. If not required, a HV backup relay, 51B, downstream from the transformer secondary breaker is acceptable provided satisfactory setting can be applied ** RT/TT may require duplication *** May be included as integral part of HVI. Typical Protection Requirements - 115 or 230kV Two Line Supply

Protection Requirements. 1.2.1. The typical technical requirements for Distributor and Consumer protection shall be followed, as presented in Exhibit E.1 of Schedule E and Exhibits F.1 and F.2 of this Schedule F. 1.2.2. Line protections are required when transformers connected to separate supply circuits are operated in parallel on the low-voltage side, or if a large synchronous infeed exists at the low-voltage bus. 1.2.3. Directional current sensing relays may be required to detect infeed into faults within the transmission system and isolate the Customer’s =s contribution to the fault. Distance or impedance (21) relays as specified in Exhibit F.2 of this Schedule F, usually serve this need. 1.2.4. If the transformer is connected ungrounded wye or delta on the primary, then ground undervoltage (64-27) and ground overvoltage (64-59) protections as shown in Exhibit F.2 of this Schedule F are required to detect ground faults. 1.2.5. Where the Transmitter has accepted transformers connected wye-grounded on the primary (Yg/D or Yg/Yg), a ground-overcurrent relay (64) as indicated in Exhibit F.2 of this Schedule F, connected in the transformer neutral, may be used for detection. 1.2.6. Where remote/transfer trip circuits are used for transformer faults to trip the Transmitter’s =s line breakers at the terminal stations, the Customer shall use a motor-motor- operated transformer disconnect switch at its station to provide a point of separation from the transmission system. Energization of remote/transfer trip and opening of the disconnect switch (89) shall be initiated simultaneously from the protection circuits. Full opening of the disconnect switch shall block sending of remote trip. 1.2.7. For a DC remote trip on a 115-kV system, the Customer shall provide all necessary equipment associated with one monitored teleprotection channel between its station and one of the supply terminal stations or tapped stations. Industry standard relays and associated equipment that is compatible with the Transmitter’s =s remote trip equipment shall be used. A 115-kV transfer trip shall have a similar requirement, except that audio- tone equipment shall be used instead of the DC battery voltage. 1.2.8. For a DC remote trip on a 230-kV system, the Customer shall provide all necessary equipment associated with two monitored teleprotection channels between its station and one of the supply terminal stations or tapped transformer stations. Normally two circuits in the same cable would be acceptable, but two separate cables going by and following separate routes may be required. The Customer shall use industry standard relays and associated equipment that is compatible with the Transmitter’s =s remote trip equipment. A 230-kV transfer trip shall have a similar requirement, except that audio-tone equipment shall be used instead of the DC battery voltage. SCHEDULE F (CONT=D) Exhibit F.1 Typical Single-Line Protection Requirements Transmission System HV Line X0 *** X XXXX XXX X XX / XX ** Transformer winding configuration will A87 T1 determine type of ground protection B87 *X F Load NOTES: * System security may dictate two transformer differential Drawing does not indicate customer protections protections. If not required, a HV backup relay, 51B, is downstream from the transformer secondary breaker acceptable provided satisfactory setting can be applied. ** RT/TT may require duplication *** M ay May be included as integral part of HVI. Typical Protection Requirements - 115 or 230kV Single Line Supply SCHEDULE F (CONT=D) Exhibit F.2 Typical Two Line Protection Requirements Transmission System HV Line L1 L1 L2 L2 *** *** F HVI HVI F H RT / TT ** H CVT’s 21-64-L1 or 64-27-L1 Requirement for 64-59-L1 T2 and L2 are similar to T1 & L1 21-L1 A87 Transformer Winding * T1 Configuration will T2 B87 determine type of ground protection X X F F N.C. Bus Tie Load NOTES: * System security may dictate two transformer differential Drawing does not indicate customer protections protections. If not required, a HV backup relay, 51B, downstream from the transformer secondary breaker is acceptable provided satisfactory setting can be applied ** RT/TT may require duplication *** May be included as integral part of HVI. Typical Protection Requirements - 115 or 230kV Two Line SupplySupply Transmission System Code, Appendix 1 (version A)

Protection Requirements. 1.2.1. The typical technical requirements for Distributor and Consumer protection shall be followed, as presented in Exhibit E.1 of Schedule E and Exhibits F.1 and F.2 of this Schedule F. 1.2.2. Line protections are required when transformers connected to separate supply circuits are operated in parallel on the low-voltage side, or if a large synchronous infeed exists at the low-voltage bus. 1.2.3. Directional current sensing relays may be required to detect infeed into faults within the transmission system and isolate the Customer’s =s contribution to the fault. Distance or impedance (21) relays as specified in Exhibit F.2 of this Schedule F, usually serve this need. 1.2.4. If the transformer is connected ungrounded wye or delta on the primary, then ground undervoltage (64-27) and ground overvoltage (64-59) protections as shown in Exhibit F.2 of this Schedule F are required to detect ground faults. 1.2.5. Where the Transmitter has accepted transformers connected wye-grounded on the primary (Yg/D or Yg/Yg), a ground-overcurrent relay (64) as indicated in Exhibit F.2 of this Schedule F, connected in the transformer neutral, may be used for detection. 1.2.6. Where remote/transfer trip circuits are used for transformer faults to trip the Transmitter’s =s line breakers at the terminal stations, the Customer shall use a motor-motor- operated transformer disconnect switch at its station to provide a point of separation from the transmission system. Energization of remote/transfer trip and opening of the disconnect switch (89) shall be initiated simultaneously from the protection circuits. Full opening of the disconnect switch shall block sending of remote trip. 1.2.7. For a DC remote trip on a 115-kV system, the Customer shall provide all necessary equipment associated with one monitored teleprotection channel between its station and one of the supply terminal stations or tapped stations. Industry standard relays and associated equipment that is compatible with the Transmitter’s =s remote trip equipment shall be used. A 115-kV transfer trip shall have a similar requirement, except that audio- tone equipment shall be used instead of the DC battery voltage. 1.2.8. For a DC remote trip on a 230-kV system, the Customer shall provide all necessary equipment associated with two monitored teleprotection channels between its station and one of the supply terminal stations or tapped transformer stations. Normally two circuits in the same cable would be acceptable, but two separate cables going by and following separate routes may be required. The Customer shall use industry standard relays and associated equipment that is compatible with the Transmitter’s =s remote trip equipment. A 230-kV transfer trip shall have a similar requirement, except that audio-tone equipment shall be used instead of the DC battery voltage. SCHEDULE F (CONT=D) Exhibit F.1 Typical Single-Line Protection Requirements Transmission System HV Line X0 *** X XXXX XXX X XX / XX ** Transformer winding configuration will A87 T1 determine type of ground protection B87 *X F Load NOTES: * System security may dictate two transformer differential Drawing does not indicate customer protections protections. If not required, a HV backup relay, 51B, is downstream from the transformer secondary breaker acceptable provided satisfactory setting can be applied. ** RT/TT may require duplication *** M ay May be included as integral part of HVI. Typical Protection Requirements - 115 or 230kV Single Line Supply SCHEDULE F (CONT=D) Exhibit F.2 Typical Two Line Protection Requirements Transmission System HV Line L1 L1 L2 L2 *** *** F HVI HVI F H RT / TT ** H CVT’s 21-64-L1 or 64-27-L1 Requirement for 64-59-L1 T2 and L2 are similar to T1 & L1 21-L1 A87 Transformer Winding * T1 Configuration will T2 B87 determine type of ground protection X X F F N.C. Bus Tie Load NOTES: * System security may dictate two transformer differential Drawing does not indicate customer protections protections. If not required, a HV backup relay, 51B, downstream from the transformer secondary breaker is acceptable provided satisfactory setting can be applied ** RT/TT may require duplication *** May be included as integral part of HVI. Typical Protection Requirements - 115 or 230kV Two Line Supply

Protection Requirements. 1.2.1. The typical technical requirements for Distributor and Consumer Customer protection shall be followed, as presented in Exhibit E.1 of Schedule E and Exhibits F.1 and F.2 of this Schedule F. 1.2.2. Line protections are required when transformers connected to separate supply circuits are operated in parallel on the low-voltage side, or if a large synchronous infeed exists at the low-voltage bus. 1.2.3. Directional current sensing relays may be required to detect infeed into faults within the transmission system and isolate the Customer’s contribution to the fault. Distance or impedance (21) relays as specified in Exhibit F.2 of this Schedule F, usually serve this need. 1.2.4. If the transformer is connected ungrounded wye or delta on the primary, then ground undervoltage (64-27) and ground overvoltage (64-59) protections as shown in Exhibit F.2 of this Schedule F are required to detect ground faults. 1.2.5. Where the Transmitter has accepted transformers connected wye-grounded on the primary (Yg/D or Yg/Yg), a ground-overcurrent relay (64) as indicated in Exhibit F.2 of this Schedule F, connected in the transformer neutral, may be used for detection. 1.2.6. Where remote/transfer trip circuits are used for transformer faults to trip the Transmitter’s line breakers at the terminal stations, the Customer shall use a motor-motor- operated transformer disconnect switch at its station to provide a point of separation from the transmission system. Energization of remote/transfer trip and opening of the disconnect switch (89) shall be initiated simultaneously from the protection circuits. Full opening of the disconnect switch shall block sending of remote trip. 1.2.7. For a DC remote trip on a 115-kV system, the Customer shall provide all necessary equipment associated with one monitored teleprotection channel between its station and one of the supply terminal stations or tapped stations. Industry standard relays and associated equipment that is compatible with the Transmitter’s remote trip equipment shall be used. A 115-kV transfer trip shall have a similar requirement, except that audio- tone equipment shall be used instead of the DC battery voltage. 1.2.8. For a DC remote trip on a 230-kV system, the Customer shall provide all necessary equipment associated with two monitored teleprotection channels between its station and one of the supply terminal stations or tapped transformer stations. Normally two circuits in the same cable would be acceptable, but two separate cables going by and following separate routes may be required. The Customer shall use industry standard relays and associated equipment that is compatible with the Transmitter’s remote trip equipment. A 230-kV transfer trip shall have a similar requirement, except that audio-tone equipment shall be used instead of the DC battery voltage. Exhibit F.1 Typical Single-Line Protection Requirements Transmission System HV Line X0 *** X XXXX XXX X XX / XX ** Transformer winding configuration will A87 T1 determine type of ground protection B87 *X F Load NOTES: * System security may dictate two transformer differential Drawing does not indicate customer protections protections. If not required, a HV backup relay, 51B, is downstream from the transformer secondary breaker acceptable provided satisfactory setting can be applied. ** RT/TT may require duplication *** M ay May be included as integral part of HVI. Typical Protection Requirements - 115 or 230kV Single Line Supply Exhibit F.2 Typical Two Line Protection Requirements Transmission System HV Line L1 L1 L2 L2 *** *** F HVI HVI F H RT / TT ** H CVT’s 21-64-L1 or 64-27-L1 Requirement for 64-59-L1 T2 and L2 are similar to T1 & L1 21-L1 A87 Transformer Winding * T1 Configuration will T2 B87 determine type of ground protection X X F F N.C. Bus Tie Load NOTES: * System security may dictate two transformer differential Drawing does not indicate customer protections protections. If not required, a HV backup relay, 51B, downstream from the transformer secondary breaker is acceptable provided satisfactory setting can be applied ** RT/TT may require duplication *** May be included as integral part of HVI. Typical Protection Requirements - 115 or 230kV Two Line Supply

Protection Requirements. 1.2.1. The typical technical requirements for Distributor and Consumer protection shall be followed, as presented in Exhibit E.1 of Schedule E and Exhibits F.1 and F.2 of this Schedule F. 1.2.2. Line protections are required when transformers connected to separate supply circuits are operated in parallel on the low-voltage side, or if a large synchronous infeed exists at the low-voltage bus. 1.2.3. Directional current sensing relays may be required to detect infeed into faults within the transmission system and isolate the Customer’s contribution to the fault. Distance or impedance (21) relays as specified in Exhibit F.2 of this Schedule F, usually serve this need. 1.2.4. If the transformer is connected ungrounded wye or delta on the primary, then ground undervoltage (64-27) and ground overvoltage (64-59) protections as shown in Exhibit F.2 of this Schedule F are required to detect ground faults. 1.2.5. Where the Transmitter has accepted transformers connected wye-grounded on the primary (Yg/D or Yg/Yg), a ground-overcurrent relay (64) as indicated in Exhibit F.2 of this Schedule F, connected in the transformer neutral, may be used for detection. 1.2.6. Where remote/transfer trip circuits are used for transformer faults to trip the Transmitter’s line breakers at the terminal stations, the Customer shall use a motor-operated transformer disconnect switch at its station to provide a point of separation from the transmission system. Energization of remote/transfer trip and opening of the disconnect switch (89) shall be initiated simultaneously from the protection circuits. Full opening of the disconnect switch shall block sending of remote trip. 1.2.7. For a DC remote trip on a 115-kV system, the Customer shall provide all necessary equipment associated with one monitored teleprotection channel between its station and one of the supply terminal stations or tapped stations. Industry standard relays and associated equipment that is compatible with the Transmitter’s remote trip equipment shall be used. A 115-kV transfer trip shall have a similar requirement, except that audio- audio-tone equipment shall be used instead of the DC battery voltage. 1.2.8. For a DC remote trip on a 230-kV system, the Customer shall provide all necessary equipment associated with two monitored teleprotection channels between its station and one of the supply terminal stations or tapped transformer stations. Normally two circuits in the same cable would be acceptable, but two separate cables going by and following separate routes may be required. The Customer shall use industry standard relays and associated equipment that is compatible with the Transmitter’s remote trip equipment. A 230-kV transfer trip shall have a similar requirement, except that audio-tone equipment shall be used instead of the DC battery voltage. Exhibit F.1 Typical Single-Line Protection Requirements Transmission System HV Line X0 *** X XXXX XXX X XX / XX ** Transformer winding configuration will A87 T1 determine type of ground protection B87 *X F Load NOTES: * System security may dictate two transformer differential Drawing does not indicate customer protections protections. If not required, a HV backup relay, 51B, is downstream from the transformer secondary breaker acceptable provided satisfactory setting can be applied. ** RT/TT may require duplication *** M ay be included as integral part of HVI. Typical Protection Requirements - 115 or 230kV Single Line Supply Exhibit F.2 Typical Two Line Protection Requirements L1 Transmission System HV Line L1 L1 L2 L2 *** *** F HVI HVI F H RT X X X XX / TT XX ** H CVT’s 21-64-L1 or 64-27-L1 Requirement for 64-59-L1 T2 and L2 are similar to T1 & L1 21-L1 A87 B87 T1 Transformer Winding * T1 Configuration will T2 B87 determine type of ground protection X X F F N.C. Bus Tie Load NOTES: * System security may dictate two transformer differential Drawing does not indicate customer protections protections. If not required, a HV backup relay, 51B, downstream from the transformer secondary breaker is acceptable provided satisfactory setting can be applied ** RT/TT may require duplication *** May be included as integral part of HVI. Typical Protection Requirements - 115 or 230kV Two Line SupplyT2