Re - Advertisement for 245kV Circuit Switcher

2026-11-03

. 1 The Town of Apex ( Owner ) intends to procure an outdoor 245 kV circuit switcher for protection of a substation power transformer . The primary function of the circuit switcher will be switching and protection of a 230 kV - 23 kV twowinding delta - wye power transformer . The unit shall be complete and ready for operation upon completion of erection and the application of the Owner ’ s supply voltage and relaying package . The Seller ’ s work consists of providing all labor , materials , equipment , tools and supplies required to design , manufacture , test and deliver the outdoor circuit switcher and associated components as described herein . This specification is written based upon SF6 insulation / interruption . Alternatives will be considered . 1 . 2 The unit shall be designed to accommodate the automatic interruption of faults occurring on the load side of the unit . The unit shall initiate an automatic trip operation when such fault conditions are detected by an appropriate external relay system . Using a shunt trip mechanism , the unit shall provide safe interruption of service to the faulted bus and transmission facilities when applied within the guidelines of ANSI C37 and other applicable standards . 1 . 3 The unit shall utilize a motor - compressed spring - operated mechanism which can provide an open - close - open operation at rated short - circuit current or at other required capabilities after loss of control power to the mechanism and thereafter recharge the spring mechanism within 15 seconds following application of control power . 1 . 4 The Owner will supply control / utilization voltages as listed herein . The Seller shall not provide equipment that does not operate at the voltages provided unless prior approval is obtained from the Owner . If the Owner approves , the manufacturer is responsible for providing all transformation necessary to convert the Owner ’ s supplied voltage to the required utilization voltage . 1 . 5 The Seller shall assume all costs and risks for delivery of the products to the designated site . 1 . 6 All components incorporated into the manufactured product shall be new and of high quality . All workmanship shall be of good quality and free from defects . The Seller shall , if required by the Engineer , furnish satisfactory evidence as to the source , kind and quality of the components incorporated into the system configuration . 1 . 7 The Seller ’ s products shall include the major material items as required in the technical specifications for each enclosure or assembly . Incidental materials , tools and fabrications not included herein , but required for construction of a completely assembled and functional product shall be furnished by the Seller . 1 . 8 All services provided by the Seller during the course of assembly , testing and training shall be performed by competent personnel technically qualified for the service to be performed . 1 . 9 All components and services furnished in the manufacture of the product shall be subject to inspection , tests and approval by the Owner . The Seller shall provide adequate facilities for inspecting and testing the system prior to shipment . 1 . 10 The Owner reserves the right to reject any or all components failing to comply with the technical specifications or failing to comply with the characteristics represented by the Seller ’ s proposal , and as mutually agreed upon by the terms of the contract . The elapsed time for discovery of such noncompliance and subsequent rejection shall , at a minimum , include factory test dates and extend to one year following delivery of the manufactured product . 1 . 11 On behalf of the Owner , the Engineer will have authority to disapprove or reject materials or services that are defective or lack compliance with the Technical Specifications . 1 . 12 Upon discovery of noncompliance , the Owner shall notify the Seller in writing as to the nature of the defect within 60 days after such discovery . Upon receipt of notice , the Bidder shall replace the rejected components to the extent necessary to comply with the specifications and contract . In doing so , the Seller shall bear all costs for shipment of rejected components and replacement components . Should the Seller fail to replace rejected components , the Owner may elect to replace such components directly and deduct the cost of replacement from final payments due the Seller . 2 . 0 STANDARDS Circuit switcher furnished in accordance with these technical specifications shall conform to the latest revision of ANSI C37 and all other applicable standards 3 . 0 UNIT RATINGS AND CHARACTERISTICS 3 . 1 Model type : Vertical interrupter , no disconnect , “ candlestick ”. 3 . 2 120 ” phase spacing . 3 . 3 Circuit switcher shall deliver the full ratings of performance in ambient temperatures ranging from - 30 ° C to + 40 ° C , and at altitudes up to 1000 meters ( 3300 feet ). Operating altitude shall not adversely affect the fault current interrupting rating of the circuit breaker or the rated interrupting time of the circuit breaker . 3 . 4 When installed in accordance with manufacturer ’ s structural design , circuit breakers shall withstand seismic loadings for Apex , NC . Unit shall deliver the full ratings of performance in wind loading of 120 miles per hour without adverse effect upon the fault current interrupting rating of the circuit breaker or the rated interrupting time of the circuit breaker . 3 . 6 Unit shall deliver the full ratings of performance under one inch of ice accumulation without adverse effect upon the fault current interrupting rating of the circuit breaker or the rated interrupting time of the circuit breaker . 3 . 7 All units shall provide synchronized , three - pole interruption of loads and faults up to the maximum rated interrupting capacity in accordance with ANSI and NEMA rating schedules . 3 . 8 Each interrupter shall be equipped with a temperature - compensated pressure switch to monitor the gas in the pole units . The switch shall have a gauge which is easily visible from the ground or is inside the control cabinet . Switch shall have a contact which signals when the gas is within 5 PSI of the lockout value . Switch shall have a second set of contacts that prevents operation if pressure falls below where interruption is not assured . 3 . 9 Unit shall have rupture disk on each phase . 3 . 10 Unit shall have galvanized base support that is 120 ” tall . Anchor bolts shall be included with unit and shall have two hex nuts and two flat washers . 3 . 11 Unit shall be factory timed and tested . 3 . 12 If unit is shipped with a lower gas pressure than designed for operation , gas bottles for filling shall be supplied . Required hoses , tools , etc . needed for gas filling shall be supplied regardless of whether unit is shipped at or below pressure . 3 . 13 Unit shall have 5 year ( min ) warranty . 3 . 14 Auxillary switches provided for customer use .

North Carolina

2026-05-05