Specifications include, but are not limited to: 4. CIRCUIT BREAKER ELECTRICAL CHARACTERISTICS 4.1 Rated Maximum Voltage - - - - - - - - - - - - - - - - - - - - - 170,000 volt. 4.2 Insulation level, low frequency and full wave impulse withstand, per ANSI Standards for the specified voltage class. 4.3 Rated Continuous Current (Minimum) - - - - - - - - - - - - 2,000 amperes. 4.4 Rated Short-Circuit Current - - - - - - - - - - - - - - - - - - - - 40,000 amperes R.M.S. Symmetrical 4.5 Rated Interrupting Time - - - - - - - - - - - - - - - - - - - - - - -3 Cycles (Maximum) 4.6 TRV first pole to clear factor (kpp) - - - - - - - - - - - - - - - 1.5 4.7 Rated Closing and Latching Current- - - - - - - - - - - - - - 104 kA peak 4.8 BIL - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 750kV 4.9 Chopped Wave Impulse 2 microseconds - - - - - - - - - - 968kV 5. CIRCUIT BREAKER PHYSICAL CHARACTERISTICS 5.1 Outdoor, three (3) poles. 5.2 The breaker shall meet the latest seismic requirements of IEEE C37.81 and 693 for the location and shipping methods. 5.3 Breaker shall be dead tank, three tank design, gang operated utilizing gaseous SF6 as an interrupting and insulating medium in a one-pressure "puffer" design. 5.4 The breaker shall not initially be installed and operated as an independent pole operated breaker. 5.5 There shall be one operating mechanism per pole; breaker shall be capable of conversion to true independent pole operation. 5.6 The breaker shall have a common frame or base mounting. The frame or base shall be of strong structural steel members or beams with each tank welded or bolted to the steel member or beams. The three (3) tank assembly shall be provided with hooks or lift holes such that the assembly shall not deform even if lifting forces are unequal or the unit is rolled or pulled into position. Two (2) stainless steel or copper ground pads, NEMA standard 2- hole, shall be provided on the base on diagonally opposite corners. 5.7 All surfaces of the equipment to be painted shall be thoroughly cleaned by sandblasting or other methods and then painted in accordance with referenced standards. The exterior finish shall be light gray ANSI No. 70. All finished or machine surfaces of steel, not painted, shall be coated with a removable corrosion resisting compound for shipment. 5.8 Breaker support frames shall be galvanized steel. 5.9 The breaker shall be shipped completely assembled except for sub-frame. Degree of assembly for shipment and estimate field assembly time shall be included in the Bid Proposal. 5.10 Any special lifting devices to assist unloading and placing the breaker shall be provided. One set for each order shall be provided. 5.11 The breaker shall be fully assembled, tested, and adjusted at the factory. 6. SF6 - GAS INTERRUPTING BREAKERS 6.1 Contacts for SF6 breakers shall utilize high-pressure current transfer contact surfaces. Interrupters shall use a flow directing non conducting SF6 nozzle and shall be a one pressure "puffer" design. The breaker shall be capable of operating at minus 30 degrees C without the use of heaters. 6.2 A temperature compensated pressure switch shall be installed to actuate an external alarm upon falling pressure. Additional switches shall be provided to either trip or block trip, and to open the closing circuit prior to loss of sufficient gas pressure for proper interruption. The trip and block trip contacts shall be wired to a terminal block to allow for jumpers to be installed to select the desired mode of operation. The use of any normally energized relays shall be prohibited. Provide terminal blocks to jumper the normally closed block trip contacts when the low-pressure trip mode is selected. The temperature sensing element for the temperature compensated pressure switch shall be mounted externally to accurately sense the tank temperature. 6.3 Gaseous sulfur hexafluoride (SF6) shall meet or exceed the requirements of ASTM D2472. 6.4 Desiccants shall be used in each separate SF6 compartment to absorb arc products and water. 6.5 The interrupters shall utilize a cantilevered design for the stationary and moving contacts. In the open position, no part(s) of the interrupter assembly shall bridge the open contacts. 6.6 Valves shall be provided for sampling SF6. 6.7 Breaker shall be equipped with temperature compensated pressure gauges. 6.8 Each phase unit shall be a self-contained SF6 gas system with all accessories provided for each phase. 6.9 The SF6 gas system shall include all necessary receivers, valves, pressure gauges, piping, fittings, and devices as required to supply SF6 gas to each phase of the breaker.
