Circuit Breakers. 21 The BBS must be equipped with an AC Input circuit breaker that protects both the UPS and the 22 loads connected to the output. Should the AC input breaker on the UPS trip, it must allow the 23 UPS to go to inverter mode to power the intersection off of batteries. Should an overload 24 condition still exist when the inverter is energized the inverter must revert to its internal 25 electronic protection, preventing damage to the inverter due to the overload or short circuit 26 condition, on the output. Once this overload condition is cleared the inverter must energize and 27 power the intersection utilizing the available battery power. If the condition does not clear itself, 28 the inverter must stay in the standby mode until manually cleared by a technician.
Circuit Breakers. Each of the five breakers shall use reclosing and redundant breaker failure protection. ‘A’ and ‘B’ package breaker failure protection will be performed by two (2) SEL 351-6 relays for each breaker at the station (totaling ten (10) breaker failure relays). Reclosing will be performed by one (1) SEL 351-6 relay for each breaker in the station (totaling five (5) reclosing relays). Direct Transfer Trip (DTT) will be required between Laona Station and all three substations (Dunkirk, Falconer, and Arkwright Collector) for breaker failure protection. Lines 161 and 162 to Dunkirk and Lines 172 and 173 to Falconer will use the XXX XXXX0000. Line 174 to Arkwright Collector Substation will use the functionality of the line differential relays. Direct Transfer Trip receive from the Arkwright Collector Substation will be required for breaker failure. The functionality of the line differential relay will be used to transmit the signal. A transfer trip receive relay to trip the Line 174 breakers is required. Telecommunications • Protection Teleprotection between Laona Station and each of the remote substations (Dunkirk and Falconer) shall be new leased T1 fiber circuits from the local telco company (DFT Communications). The Connecting Transmission Owner is responsible for ordering these two circuits. Two (2) patch panels will be required at Laona Station for the fiber lines that the Developer must install between the Arkwright Collector Substation and the Laona Station. • Energy Management System and Remote Transmitting Unit (EMS-RTU) One (1) new digital data T1 64k MPLS VPN circuit provided through the telecom network fiber is required for the EMS-RTUs GarrettCom DX-940. The Developer is required to provide generator status to the Company’s EMS. To accommodate this, the Developer’s RTU at the Arkwright Collector Substation shall connect at Laona Station to a RS-232 serial port on the GarrettCom DX-940, or one of the RTUs, via the Developer’s fiber line between the two stations. Media converters may be required to convert from fiber to copper. • 911 Emergencies One (1) voice grade phone circuit shall be installed to the Laona Station meter panel for 911 emergencies. • Digital Fault Recorder (DFR) Two (2) DS-1 circuit shall be required for the Digital Fault Recorders.
Circuit Breakers. Each of the six (6) breakers shall use reclosing and redundant breaker failure protection. ‘A’ and ‘B’ package breaker failure protection will be performed by two (2) SEL 351-6 relays for each breaker at the station (totaling twelve (12) breaker failure relays). Reclosing will be performed by one (1) SEL 351-6 relay for each breaker in the station (totaling six (6) reclosing relays). Direct Transfer Trip (“DTT”) will be required between the Moon Road Station and the Xxxxxxxxx, Xxxxx, and Falconer stations for breaker failure protection. Lines 172 and 173 to Laona will use the RFL GARD 8000 for both transmit and receive, and an SEL-351-6, 94TTA relay will be added to trip and drive reclosing to lockout. Lines 175 and 176 to Falconer will use the RFL GARD 8000. These terminals will require DTT receive only, and an SEL-351-6, 94TTA relay will be added to trip and drive the reclosing to lockout. Line 177 to the Cassadaga Collector Substation will use the functionality of the line differential relays for both DTT transmit and receive. SEL 351-6 relays, 94 TTA and 94 TTB will be added to trip and drive the reclosing to lockout.
Circuit Breakers. GIS Circuit breakers shall in general be of C2-M2 class and comply to IEC-62271-100. The rated break time shall not exceed 40 ms for 765kV & 400kV. Circuit breakers shall be provided with single phase and three phase auto reclosing. The Circuit breakers controlling 765kV lines shall be provided with pre insertion closing resistor of about 450 ohms with 9 ms insertion time or Controlled Switching Device (CSD). The Circuit breakers controlling 400kV lines wherever required shall be provided with pre insertion closing resistor of about 400 ohms with 8 ms insertion time or Controlled Switching Device (CSD) for lines longer than 200 km. The short line fault capacity shall be same as the rated capacity and this is proposed to be achieved without use of opening resistors. Control switching device shall be provided in Circuit Breaker of switchable line reactor bay and in Main & Tie bay circuit breakers of line with non-switchable line reactors, Bus reactors and 765/400kV Transformers (wherever applicable).
Circuit Breakers. The circuit breakers to be used shall be of live or dead tank type and be provided with seismic dampers, if necessary. The circuit breakers shall have the following supplementary characteristics: Description 220 kV 60 kV Short-circuit duration 1” 1” Total opening time 3 cycles 3 cycles Sequence of operation: a) Operation of the transformer b) Operation of lines CO-15”-CO O-0.3”-CO-3’-CO CO-15”-CO O-0.3”-CO-3’-CO Type Outdoor Outdoor
Circuit Breakers. The circuit breakers to be used shall be of live tank type and be provided with seismic dampers, if necessary. The circuit breakers shall have the following supplementary characteristics: Short-circuit duration Total opening time Sequence of operation: 1”
Circuit Breakers. Intentionally Deleted
Circuit Breakers. Each of the three (3) breakers shall use reclosing and redundant breaker failure protection. ‘A’ and ‘B’ package breaker failure protection will be performed by two (2) SEL 351-6 relays for each breaker at the station (totaling six (6) breaker failure relays). Reclosing will be performed by one (1) SEL 351-6 relay for each breaker in the station (totaling three (3) reclosing relays). Direct Transfer Trip (“DTT”) will be required between the Xxxxxxxx Road Station and the Dunkirk and New Gardenville stations for breaker failure protection. Lines 73 to Dunkirk and Line 84 to New Gardenville will use two (2) different relay packages. The ‘A’ package will use RFL 9780 FSK carrier equipment and the ‘B’ package will use the mirrored bit functionality of the SEL 351-6 relay and the RFL IMUX 2000. The Generator Tie Line to the Ball Hill Collector Substation will use the functionality of the line differential relays. DTT receive from the Ball Hill Collector Substation will be required for breaker failure. The functionality of the line differential relay will be used to transmit the signal. A and B transfer trip receive relays to trip the Generator Tie Line breakers is required.
Circuit Breakers. It shall be a ring bus system of circuit breakers (Purchaser’s approval required) in the switchyard. One and one-half breakers are required at each interconnection point to the switchyard. The breakers shall be insulated with SF6 gas and shall be equipped for outdoor installation. Circuit breaker accessories including current transformers (CTs), auxiliary contacts, space heaters, alarms etc. shall be furnished as required for the installation. All circuit breakers shall include relaying accuracy CTs for the protective relay schemes and metering accuracy CTs to be used for metering purposes. Metering accuracy CTs shall be as defined below under “Metering”.
Circuit Breakers. All circuits shall be circuit breaker or fuse protected in the body circuits.
