S&C System VI Switchgear Indoor and Outdoor Distribution (15 kv through 38 kv)

Transcription

1 S&C Sytem VI Switchgear Indoor and Outdoor Ditribution (15 kv through 38 kv) I. General 1.01 The witchgear hall be in accordance with the one-line diagram, and hall conform to the following pecification The witchgear hall conit of a ga-tight tank containing SF 6 ga, load-interrupter witche and reettable vacuum fault interrupter with viible open gap and integral viible ground, and a microproceor-baed overcurrent control. Load-interrupter witch terminal hall be equipped with buhing rated ampere continuou, and fault-interrupter terminal hall be equipped with buhing well rated 200 ampere continuou or buhing rated ampere continuou (a pecified) to provide for elbow connection. Manual operating mechanim and viewing window hall be located on the oppoite ide of the tank from the buhing and buhing well o that operating peronnel hall not be required to perform any routine operation in cloe proximity to high-voltage elbow and cable. Metering bay hall be connected to witching cubicle via buhing connecting the bu of the witching cubicle to the bu of the metering bay Rating The rating for the integrated witchgear hall be a deignated below. (Select value from one of the column hown in the table on page 2.) Frequency, Hz kv, Maximum kv, BIL Main Bu Continuou, Ampere Three-Pole Load-Interrupter Switche Continuou, Ampere Load Dropping, Ampere Ten-Time Duty-Cycle Fault-Cloing, Ampere RMS Symmetrical Ampere, Peak Fault Interrupter Continuou, Ampere Load Dropping, Ampere Ten-Time Duty-Cycle Fault Interrupting, Ampere RMS Symmetrical Ten-Time Duty-Cycle Fault-Cloing, Ampere RMS Symmetrical Ampere, Peak Short-Circuit Rating Ampere, RMS Symmetrical New Publication c2000 Page 1 of 10

2 S&C Sytem VI Switchgear Indoor and Outdoor Ditribution (15 kv through 38 kv) SELECTION OF RATINGS1 IEC ANSI Frequency, Hz or or 60 kv Voltage Cla Max BIL Main Bu Continuou, Ampere Three-Pole Load- Interrupter Switche Fault Interrupter Short- Circuit Rating Continuou, Ampere Load Dropping, Ampere Ten-Time Duty-Cycle Fault Cloing, Ampere RMS Symmetrical Ampere, Peak Continuou, Ampere Load Dropping, Ampere Ten-Time Duty-Cycle Fault Interrupting, Ampere RMS Symmetrical Ten-Time Duty-Cycle Fault Cloing, Ampere RMS Symmetrical Ampere, Peak Ampere, RMS Symmetrical Actual capabilitie may be limited to lower value by the buhing inert, elbow, and cable ued on thee unit. a Rating are ampere ( ampere for IEC) continuou and load dropping when the fault interrupter are furnihed with - ampere buhing Certification of Rating The manufacturer of the witchgear hall be completely and olely reponible for the performance of the load-interrupter witch and fault interrupter a well a the complete integrated aembly a rated. The manufacturer hall furnih, upon requet, certification of rating of the load-interrupter witch, fault interrupter, and the integrated witchgear aembly coniting of witche and fault interrupter in combination with the ga-tight tank Compliance with Standard and Code The witchgear hall conform to or exceed the applicable requirement of the following tandard and code: The applicable portion of ANSI C , covering encloure integrity for padmounted equipment. The applicable portion of ANSI C37.71, ANSI C37.72, ANSI C37.73, IEC 56, and IEC (Cla A), which pecify tet procedure and equence for the load-interrupter witche, fault interrupter, and the complete witchgear aembly. The following optional feature hould be pecified a required: The applicable portion of IEC 298, Appendix AA covering arc reitance, through 12.5 ka for 15 cycle. Page 2 of 10

3 II. Contruction (Switching and Interrupting Cubicle) 2.01 SF 6 -Ga Inulation The SF 6 ga hall conform to ASTM D2472. The witchgear hall be filled with SF 6 ga to a preure of 7 pig at 68º F. The ga-tight tank hall be evacuated prior to filling with SF 6 ga to minimize moiture in the tank. The witchgear hall withtand ytem voltage at a ga preure of 0 pig at 68º F. (f) 2.02 Ga-Tight Tank A ga-fill valve hall be provided. A temperature-compenated preure gauge hall be provided that i color coded to how the operating range. The gauge hall be mounted inide the ga-tight tank (viible through a large viewing window) to provide conitent preure reading regardle of the temperature or altitude at the intallation ite. The tank hall be ubmerible and able to withtand up to 10 feet of water over the bae. The tank hall be of welded contruction and hall be made of 7-gauge mild teel or Type 304 tainle teel, a pecified in Section IV. A mean of lifting the tank hall be provided Ga-Tight Tank Finih (for mild teel only) To remove oil and dirt, to form a chemically and anodically neutral converion coating to improve the finih-to-metal bond, and to retard underfilm propagation of corroion, mild-teel urface hall undergo a thorough pretreatment proce compried of a fully automated ytem of cleaning, rining, phophatizing, ealing, drying, and cooling, before any protective coating are applied. By utilizing an automated pretreatment proce, the mild-teel urface of the ga-tight tank hall receive a highly conitent thorough treatment, eliminating fluctuation in reaction time, reaction temperature, and chemical concentration. After pretreatment, protective coating hall be applied that hall help reit corroion and protect the mild-teel urface of the ga-tight tank. To etablih the capability to reit corroion and protect the mild teel, repreentative tet pecimen coated by the manufacturer finihing ytem hall atifactorily pa the following tet: (1) 1500 hour of expoure to alt-pray teting per ASTM B 117 with: (i) Underfilm corroion not to extend more than ¹ ₃₂ from the cribe a evaluated per ASTM D 1645, Procedure A, Method 2 (craping); and (ii) Lo of adheion from bare metal not to extend more than ¹ ₈ from the cribe. Page 3 of 10

4 S&C Sytem VI Switchgear Indoor and Outdoor Ditribution (15 kv through 38 kv) (2) 1000 hour of humidity teting per ASTM D 4585 uing the Cleveland Condening Type Humidity Cabinet with no blitering a evaluated per ASTM D 714. (3) Crohatch adheion teting per ASTM D 3359 Method B with no lo of finih. Certified tet abtract ubtantiating the above capabilitie hall be furnihed upon requet. The finih hall be inpected for cuff and cratche. Blemihe hall be touched up by hand to retore the protective integrity of the finih. The finih hall be indoor light gray, atifying the requirement of ANSI Standard Z55.1 for No Viewing Window 2.05 High-Voltage Bu Each load-interrupter witch hall be provided with a large viewing window at leat 6 inche by 12 inche to allow viual verification of the witch-blade poition (open, cloed, and grounded) while hining a flahlight on the blade. Each fault interrupter hall be provided with a large viewing window at leat 6 inche by 12 inche to allow viual verification of the diconnect-blade poition (open, cloed, and grounded) while hining a flahlight on the blade. Viewing window hall be located on the oppoite ide of the gear from the buhing and buhing well o that operating peronnel hall not be required to perform any routine operation in cloe proximity to high-voltage elbow and cable. A cover hall be provided for each viewing window to prevent operating peronnel from viewing the flah which may occur during witching operation. Bu and interconnection hall withtand the tree aociated with hort-circuit current up through the maximum rating of the witchgear. Before intallation of aluminum bu, all electrical contact urface hall firt be prepared by machine abrading to remove any oxide film. Immediately after thi operation, the electrical contact urface hall be coated with a uniform coating of an oxide inhibitor and ealant Proviion for Grounding 2.07 Termination One ground-connection pad hall be provided on the ga-tight tank of the witchgear. The ground-connection pad hall be contructed of tainle teel and welded to the ga-tight tank, and hall have a hort-circuit rating equal to that of the witchgear. Terminal for load-interrupter witche hall have -ampere buhing, and terminal for fault interrupter hall have 200-ampere buhing well to permit connection of elbow. Page 4 of 10

5 Buhing and buhing well hall be located on one ide of the gear to reduce the required operating clearance. The following optional feature hould be pecified a required: Terminal for fault interrupter hall be equipped with -ampere buhing. Buhing rated ampere continuou hall be provided without a threaded tud. Terminal for load-interrupter witche hall be equipped with 200-ampere buhing well Buhing and Buhing Well Buhing and buhing well hall conform to ANSI/IEEE Standard 386 (ANSI Standard C119.2). Buhing and buhing well hall include a emiconductive coating. Buhing and buhing well hall be mounted in uch a way that the emiconductive coating i olidly grounded to the ga-tight tank. III. Baic Component 3.01 Load-Interrupter Switche 3.02 Fault Interrupter The three-phae, gang-operated load-interrupter witche hall have a ten-time dutycycle fault-cloing rating equal to or exceeding the hort-circuit rating of the witchgear. Thi rating define the ability to cloe the witch ten time againt a three-phae fault with aymmetrical (peak) current in at leat one phae equal to the rated value, with the witch remaining operable and able to carry and interrupt rated current. Certified tet abtract etablihing uch rating hall be furnihed upon requet. The witch hall be provided with an integral ground poition that i readily viible through the viewing window to eliminate the need for cable handling and expoure to high voltage to ground the equipment. The ground poition hall have a ten-time duty-cycle fault-cloing rating. The witch hall be provided with an open poition that i readily viible through the viewing window to eliminate the need for cable handling and expoure to high voltage to etablih a viible gap. The open gap of the witch hall be ized to allow cable teting through a feedthru buhing or the back of the elbow. Fault interrupter hall have a ten-time duty-cycle fault-cloing and fault interrupting rating equal to or exceeding the hort-circuit rating of the witchgear. Thi rating define the fault interrupter ability to cloe ten time againt a three-phae fault with aymmetrical (peak) current in at leat one phae equal to the rated value and clear the reulting fault current, with the interrupter remaining operable and able to carry and interrupt rated current. Certified tet abtract etablihing uch rating hall be furnihed upon requet. Page 5 of 10

6 S&C Sytem VI Switchgear Indoor and Outdoor Ditribution (15 kv through 38 kv) (f) 3.03 Operating Mechanim (f) 3.04 Overcurrent Control The fault interrupter hall be provided with a diconnect with an integral ground poition that i readily viible through the viewing window to eliminate the need for cable handling and expoure to high voltage to ground the equipment. The ground poition hall have a ten-time duty-cycle fault-cloing rating. The diconnect hall be provided with an open poition that i readily viible through the viewing window to eliminate the need for cable handling and expoure to high voltage to etablih a viible gap. The open gap of the diconnect hall be ized to allow cable teting through a feedthru buhing or the back of the elbow. An internal indicator hall be provided for each fault interrupter to how when it i in the tripped condition. The indicator hall be clearly viible through the viewing window. Load-interrupter witche and fault interrupter hall be operated by mean of a quickmake, quick-break mechanim. The manual handle hall charge the operating mechanim for opening, cloing, and grounding of the witche and fault interrupter. Operating mechanim hall be equipped with an operation elector to prevent inadvertent operation from the cloed poition directly to the grounded poition, or from the grounded poition directly to the cloed poition. The operation elector hall require phyical movement to the proper poition to permit the next operation. Operating haft hall be padlockable in any poition to prevent operation. The operation elector hall be padlockable to prevent operation to the grounded poition. The operating mechanim hall indicate witch poition which hall be clearly viible from the normal operating poition. A microproceor-baed overcurrent control hall be provided to initiate fault interruption. The control hall be capable of ingle-pole or three-pole tripping of each fault interrupter. The control hall be mounted in a watertight encloure and hall be removable in the field without taking the gear out of ervice. Control etting hall be field programmable uing a peronal computer connected via a data port to the control. The data port hall be acceible from the exterior of the encloure. Power and ening for the control hall be upplied by integral current tranformer. Page 6 of 10

7 (f) (g) (h) (i) The minimum total clearing time (from initiation of the fault to total clearing) for fault interruption hall be 40 milliecond (2.4 cycle) at 60 hertz or 44 milliecond (2.2 cycle) at 50 hertz. The control hall feature time-current characteritic (TCC) curve including tandard E-peed, coordinating-peed tap, and coordinating-peed main curve. Coordinatingpeed tap curve hall optimize coordination with load-ide weak-link/backup currentlimiting fue combination, and coordinating-peed main curve hall optimize coordination with tap-interrupter curve. The tandard E-peed curve hall have phae-overcurrent etting ranging from 25E through 200E. The coordinating-peed tap curve hall have phae-overcurrent and independent ground-overcurrent etting ranging from 50 ampere through 400 ampere. The coordinating-peed main curve hall have phae-overcurrent and independent ground-overcurrent etting ranging from 100 ampere through 800 ampere. The control hall have intantaneou-trip (1 ka through 8 ka) and definite-time delay (32 m through 96 m) etting to allow tailoring of the coordinating-peed tap and coordinating-peed main curve to the application Optional Voltage Indication (Select voltage indication or voltage indication with proviion for low-voltage phaing.) Voltage indication (1) Voltage indication for each load-interrupter witch and fault interrupter by mean of capacitive tap on the buhing hall be provided to eliminate the need for cable handling and expoure to high voltage to tet the cable for voltage. Thi feature hall include a flahing LCD diplay to indicate the preence of voltage for each phae, and a olar panel to upply power for teting of the complete voltage-indication circuit. (2) The voltage-indication feature hall be mounted on the cover for the viewing window on the oppoite ide of the gear from the buhing and buhing well o that operating peronnel hall not be required to perform any routine operation in cloe proximity to high-voltage elbow and cable. Voltage indication with proviion for low-voltage phaing (1) Voltage indication with proviion for low-voltage phaing for each load-interrupter witch and fault interrupter by mean of capacitive tap on the buhing hall be provided to eliminate the need for cable handling and expoure to high voltage to tet the cable for voltage and phaing. Thi feature hall include a flahing LCD diplay to indicate the preence of voltage for each phae, and a olar panel to upply power for teting of the complete voltage-indication circuit and phaing circuit. (2) The voltage-indication feature hall be mounted on the cover for the viewing window on the oppoite ide of the gear from the buhing and buhing well o that operating peronnel hall not be required to perform any routine operation in cloe proximity to high-voltage elbow and cable. Page 7 of 10

8 S&C Sytem VI Switchgear Indoor and Outdoor Ditribution (15 kv through 38 kv) IV. Switchgear Encloure 4.01 Tank contruction (for witching and interrupting cubicle) The ga-tight tank hall be made of 7-gauge mild teel. The following optional feature hould be pecified a required: To guard againt corroion due to extremely harh environmental condition, the gatight tank hall be made of Type 304 tainle teel Encloure (for witching and interrupting cubicle) (f) (g) (h) (i) (j) (k) The witchgear hall be provided with a pad-mounted encloure uitable for intallation of the gear on a concrete pad. The pad-mounted encloure hall be eparable from the witchgear to allow clear acce to the buhing and buhing well for cable termination. The baic material hall be 14-gauge hot-rolled, pickled, and oiled teel heet. The encloure hall be provided with removable front and back panel, and hinged liftup roof ection for acce to the operating and termination compartment. Each roof ection hall have a retainer to hold it in the open poition. Lift-up roof ection hall overlap the panel and hall have proviion for padlocking that incorporate a mean to protect the padlock hackle from tampering. The bae hall conit of continuou 90-degree flange, turned inward and welded at the corner, for bolting to the concrete pad. Panel opening hall have 90-degree flange, facing outward, that hall provide trength and rigidity a well a deep overlapping between panel and panel opening to guard againt water entry. For buhing rated ampere continuou, the termination compartment hall be of an adequate depth to accommodate encapulated urge arreter mounted on -ampere elbow having 200-ampere interface. For buhing well rated 200 ampere continuou, the termination compartment hall be of an adequate depth to accommodate 200-ampere elbow mounted on feedthru inert. An intruction manual holder hall be provided. Non-removable lifting tab hall be provided Encloure Contruction (metering cubicle) In etablihing the requirement for the encloure deign, conideration hall be given to all relevant factor uch a controlled acce; tamper reitance; corroion reitance; protection from ingre of rodent, inect, and weed; and the poibility of arcing fault within the encloure. The material for all external ide of the encloure and the roof hall be 11-gauge hotrolled, pickled, and oiled teel heet. Page 8 of 10

9 4.04 Encloure Finih To guard againt unauthorized or inadvertent entry, there hall be no acce to high voltage through ide or rear heet of the metal-encloed witchgear aembly; and no acce to high voltage by mean of externally removable panel. To guard againt corroion, all hardware (including door fitting, fatener, etc.), all operating-mechanim part, and other part ubject to abraive action from mechanical motion hall be of either nonferrou material, or galvanized or zinc-nickel-plated material. Cadmium-plated ferrou part hall not be ued. All exterior welded eam hall be filled and anded mooth for neat appearance. To remove oil and dirt, to form a chemically and anodically neutral converion coating to improve the finih-to-metal bond, and to retard underfilm propagation of corroion, all urface hall undergo a thorough pretreatment proce compried of a fully automated ytem of cleaning, rining, phophatizing, ealing, drying, and cooling, before any protective coating are applied. By utilizing an automated pretreatment proce, the encloure hall receive a highly conitent thorough treatment, eliminating fluctuation in reaction time, reaction temperature, and chemical concentration. After pretreatment, protective coating hall be applied that hall help reit corroion and protect the teel encloure. To etablih the capability to reit corroion and protect the encloure, repreentative tet pecimen coated by the manufacturer finihing ytem hall atifactorily pa the following tet: (1) 4000 hour of expoure to alt-pray teting per ASTM B 117 with: (i) Underfilm corroion not to extend more than ¹ ₃₂ from the cribe a evaluated per ASTM D 1645, Procedure A, Method 2 (craping); and (ii) Lo of adheion from bare metal not to extend more than ¹ ₈ from the cribe. (2) 1000 hour of humidity teting per ASTM D 4585 uing the Cleveland Condening Type Humidity Cabinet with no blitering a evaluated per ASTM D 714. (3) 500 hour of accelerated weathering teting per ASTM G 53 uing lamp UVB-313 with no chalking a evaluated per ASTM D 659, and no more than 10% reduction of glo a evaluated per ASTM D 523. (4) Crohatch adheion teting per ASTM D 3359 Method B with no lo of finih. (5) 60-inch-pound impact adheion teting per ASTM D 2794 with no chipping or cracking. (6) Oil reitance teting coniting of a 72-hour immerion bath in mineral oil with no hift in color, no treaking, no blitering, and no lo of hardne. (7) 3000 cycle of abraion teting per ASTM 4060 with no penetration to the ubtrate. Certified tet abtract ubtantiating the above capabilitie hall be furnihed upon requet. Page 9 of 10

10 S&C Sytem VI Switchgear Indoor and Outdoor Ditribution (15 kv through 38 kv) The finih hall be inpected for cuff and cratche. Blemihe hall be touched up by hand to retore the protective integrity of the finih. The finih hall be olive green, Munell 7GY3.29/1.5. The following optional feature() hould be pecified a required: (1) To guard againt corroion due to extremely harh environmental condition, the entire exterior of the encloure hall be fabricated from Type 304 tainle teel. The following optional feature hould be pecified a required: (2) The finih hall be outdoor light gray, atifying the requirement of ANSI Standard Z55.1 for No. 70. V. Labeling 5.01 Hazard-Alerting Sign The exterior of the pad-mounted encloure (if furnihed) hall be provided with Warning Keep Out Hazardou Voltage Inide Can Shock, Burn, or Caue Death ign. Each unit of witchgear hall be provided with a Danger Hazardou Voltage Failure to Follow Thee Intruction Will Likely Caue Shock, Burn, or Death ign. The text hall further indicate that operating peronnel mut know and obey the employer work rule, know the hazard involved, and ue proper protective equipment and tool to work on thi equipment. Each unit of witchgear hall be provided with a Danger Keep Away Hazardou Voltage Will Shock, Burn, or Caue Death ign Nameplate, Rating Label, and Connection Diagram Each unit of witchgear hall be provided with a nameplate indicating the manufacturer name, catalog number, model number, date of manufacture, and erial number. Each unit of witchgear hall be provided with a rating label indicating the following: voltage rating; main bu continuou rating; hort-circuit rating; fault-interrupter rating including interrupting and duty-cycle fault-cloing; and load-interrupter witch rating including duty-cycle fault-cloing and hort-time. VI. Acceorie (Specify a required.) 6.01 A hotgun clamp tick (6-5¹ ₂, 8-5¹ ₂ ) in length hall be provided complete with a canva torage bag An adapter cable for connecting an overcurrent control to a uer-furnihed peronal computer (having a 25-pin or 9-pin erial communication port) in the field hall be provided An adapter cable for connecting an overcurrent control removed from it encloure to a uerfurnihed peronal computer (having a 25-pin or 9-pin erial communication port) in the hop hall be provided. Page 10 of 10