Common use of Local Breaker Back up Protection Clause in Contracts

Local Breaker Back up Protection. This shall be provided for each 765kV, 400kV and 220kV circuit breakers and will be connected to de-energize the affected stuck breaker from both sides. Notes: 1. LBB & REF relays shall be provided separately from transformer differential relay. 2. LBB relay may also be provided as built-in protection function of distributed bus bar protection scheme; however in such case separate LBB relay shall be provided for tie bays (in case of One and Half breaker scheme). 3. Over fluxing & overload protection can be provided as built-in feature of differential relay. 4. In 765kV & 400kV switchyard, if spare bay of half diameter is identified as future, Tie CB relay panel shall be provided with Auto-reclosure feature.

Local Breaker Back up Protection. This shall be provided for each 765kV, 765kV and 400kV and 220kV circuit breakers and will be connected con- nected to de-energize the affected stuck breaker from both sides. Notes:. 1. LBB & REF relays shall be provided separately from transformer differential relay. 2. LBB relay may also be provided as built-in protection function of distributed bus bar protection scheme; however however, in such case separate LBB relay shall be provided for tie bays (in case of One and Half breaker scheme). 3. Over fluxing & overload protection can be provided as built-in feature of differential relay. 4. In 765kV & 400kV switchyard, if spare bay of half diameter is identified as future, Tie CB relay panel shall be provided with Auto-reclosure feature.

Local Breaker Back up Protection. This shall be provided for each 765kV765 kV, 400kV 400 kV and 220kV 220 kV circuit breakers and will be connected con- nected to de-energize the affected stuck breaker from both sides. Notes:. 1. LBB & and REF relays shall be provided separately from the transformer differential relay. 2. LBB relay may also be provided as a built-in protection function of distributed bus bar protection scheme; however in such case a separate LBB relay shall be provided for tie bays (in case of One and Half breaker scheme). 3. Over fluxing & and overload protection can be provided as built-in feature of differential relay. 4. In 765kV & 400kV 765 kV and 400 kV switchyard, if a spare bay of half diameter is identified as future, Tie CB relay panel shall be provided with Auto-reclosure feature. 5. The bay(s) executed for future utilization under diameter completion, circuit breaker protection panel(s) shall be provided under present scope.

Local Breaker Back up Protection. This shall be provided for each 765kV, 400kV 765 kV and 220kV 400 kV circuit breakers and will be connected to de-energize the affected stuck breaker from both sides. Notes:. 1. LBB & and REF relays shall be provided separately from transformer differential relay. 2. LBB relay may also be provided as built-in protection function of distributed bus bar protection scheme; however in such case separate LBB relay shall be provided for tie bays (in case of One and Half breaker scheme). 3. Over fluxing & and overload protection can be provided as built-in feature of differential relay. 4. In 765kV & 400kV 765 kV and 400 kV switchyard, if spare bay of half diameter is identified as future, Tie CB relay panel shall be provided with Auto-reclosure feature.

Local Breaker Back up Protection. This shall be provided for each 765kV, 400kV and 220kV circuit breakers and will be connected to de-energize the affected stuck breaker from both sides. Notes: 1. LBB & REF relays shall be provided separately from transformer differential relay. 2. LBB relay may also be provided as built-in protection function of distributed bus bar protection scheme; however in such case separate LBB relay shall be provided for tie bays (in case of One and Half breaker scheme). 3. Over fluxing & overload protection can be provided as built-in feature of differential relay. 4. In 765kV & 400kV switchyard, if spare bay of half diameter is identified as future, Tie CB relay panel shall be provided with Auto-reclosure feature.

Local Breaker Back up Protection. This shall be provided for each 765kV, 400kV and 400kVand 220kV circuit breakers and will be connected to de-energize the affected stuck breaker from both sides. Notes:. 1. LBB & REF relays shall be provided separately from transformer differential relay. 2. LBB relay may also be provided as built-in protection function of distributed bus bar protection scheme; however however, in such case separate LBB relay shall be provided for tie bays (in case of One and Half breaker scheme). 3. Over fluxing & overload protection can be provided as built-in feature of differential relay. 4. In 765kV & 400kV switchyard, if spare bay of half diameter is identified as future, Tie CB relay panel relaypanel shall be provided with Auto-reclosure feature.

Local Breaker Back up Protection. This shall be provided for each 765kV765 kV, 400kV 400 kV and 220kV 220 kV circuit breakers and will be connected to de-energize the affected stuck breaker from both sides. Notes:. 1. LBB & and REF relays shall be provided separately from transformer differential relay. 2. LBB relay may also be provided as built-in protection function of distributed bus bar protection scheme; however however, in such case separate LBB relay shall be provided for tie bays (in case of One and Half breaker scheme). 3. Over fluxing & and overload protection can be provided as built-in feature of differential relay. 4. In 765kV & 400kV 765 kV and 400 kV switchyard, if spare bay of half diameter is identified as future, Tie CB relay panel shall be provided with Auto-reclosure feature.

Local Breaker Back up Protection. This shall be provided for each 765kV, 400kV and 220kV circuit breakers and will be connected con- nected to de-energize the affected stuck breaker from both sides. Notes: 1. LBB & REF relays shall be provided separately from transformer differential relay. 2. LBB relay may also be provided as built-in protection function of distributed bus bar protection scheme; however in such case separate LBB relay shall be provided for tie bays (in case of One and Half breaker scheme). 3. Over fluxing & overload protection can be provided as built-in feature of differential relay. 4. In 765kV & 400kV switchyard, if spare bay of half diameter is identified as future, Tie CB relay panel shall be provided with Auto-reclosure feature.

Local Breaker Back up Protection. This shall be provided for each 765kV, 765kVand 400kV and 220kV circuit breakers and will be connected to de-energize the affected stuck breaker from both sides. Notes:. 1. LBB & REF relays shall be provided separately from transformer differential relay. 2. LBB relay may also be provided as built-in protection function of distributed bus bar protection scheme; however in such case separate LBB relay shall be provided for tie bays (in case of One and Half breaker scheme). 3. Over fluxing & overload protection can be provided as built-in feature of differential relay. 4. In 765kV & 400kV switchyard, if spare bay of half diameter is identified as future, Tie CB relay panel shall be provided with Auto-reclosure feature.

Local Breaker Back up Protection. This shall be provided for each 765kV400kV, 400kV 220kV and 220kV 132kV circuit breakers and will be connected to de-energize the affected stuck breaker from both sides. Notes:. 1. LBB & REF relays shall be provided separately from transformer differential relay. 2. LBB relay may also be provided as built-in protection function of distributed bus bar protection scheme; however however, in such case separate LBB relay shall be provided for tie bays (in case of One and Half breaker scheme). 3. Over fluxing & overload protection can be provided as built-in feature of differential relay. 4. In 765kV & 400kV switchyard, if spare bay of half diameter is identified as future, Tie CB relay panel shall be provided with Auto-reclosure feature.

Local Breaker Back up Protection. This shall be provided for each 765kV, 400kV and 220kV circuit breakers and will be connected to de-energize the affected stuck breaker from both sides. Notes:. 1. LBB & REF relays shall be provided separately from transformer differential relay. 2. LBB relay may also be provided as built-in protection function of distributed bus bar protection scheme; however in such case separate LBB relay shall be provided for tie bays (in case of One and Half breaker scheme). 3. Over fluxing & overload protection can be provided as built-in feature of differential relay. 4. In 765kV & 400kV switchyard, if spare bay of half diameter is identified as future, Tie CB relay panel shall be provided with Auto-reclosure feature.

Local Breaker Back up Protection. This shall be provided for each 765kV, 400kV and 220kV circuit breakers and will be connected to de-energize the affected stuck breaker from both sides. Notes: 1. LBB & REF relays shall be provided separately from transformer differential relay. 2. LBB relay may also be provided as built-in protection function of distributed bus bar protection scheme; however in such case separate LBB relay shall be provided for tie bays (in case of One and Half breaker scheme). 3. Over fluxing & overload protection can be provided as built-in feature of differential relay. 4. In 765kV & 400kV switchyard, if spare bay of half diameter is identified as future, Tie CB relay panel shall be provided with Auto-reclosure feature. 5. The control & protection panels and SAS augmentation works at Aligarh S/S for the line bays and associated switchable Reactor bays under present scope shall be provided by TSP.

Local Breaker Back up Protection. This shall be provided for each 765kV, 400kV and 400kVand 220kV circuit breakers and will be connected to detode-energize the affected stuck breaker from both sides. Notes:. 1. LBB & REF relays shall be provided separately from transformer differential relay. 2. LBB relay may also be provided as built-in protection function of distributed bus bar protection scheme; however however, in such case separate LBB relay shall be provided for tie bays (in case of One and Half breaker scheme). 3. Over fluxing & overload protection can be provided as built-in feature of differential relay. 4. In 765kV & 400kV switchyard, if spare bay of half diameter is identified as future, Tie CB relay panel relaypanel shall be provided with Auto-reclosure feature.