S&C TripSaver II. Cutout-Mounted Recloser. For enhanced lateral circuit protection at 15 kv and 25 kv

Transcription

1 TripSaver II Cutout-Mounted Recloser For enhanced lateral circuit protection at 15 kv and 25 kv

2 Introducing s new TripSaver II Cutout-Mounted Recloser: A better solution for overhead lateral circuit protection at 15 kv and 25 kv Conventional lateral circuit protection requires some concessions Over 90% of temporary faults on overhead distribution circuits occur on laterals. Over the years, utilities have dealt with lateral protection a couple of ways. Some utilities employ a fuse blowing philosophy: The substation feeder breaker is properly coordinated with the lateral fuse, so that the fuse will clear any downstream fault within its rating... not the breaker. The problem: Service to customers on the lateral is permanently interrupted even for a temporary fault as shown in Figure 1. And the utility must deal with the high cost of service calls to replace lateral fuses. Feeder breaker Temporary or permanent fault Lateral fuse Feeder breaker Temporary fault Figure 1. Fuse blowing philosophy. Lateral fuse Other utilities employ a fuse saving philosophy: The first trip of the substation feeder breaker is intentionally miscoordinated so that the breaker operates faster than the lateral fuse to clear a fault downstream of the lateral fuse. The second trip of the breaker is slower so that if the fault is still present, the lateral fuse will operate to clear it. The problem: All customers on the feeder experience a momentary interruption for all faults as shown in Figure 2. Figure 2. Fuse saving philosophy. TripSaver II provides better lateral protection s new TripSaver II Cutout-Mounted Recloser eliminates these problems. It s ideally suited for protection of laterals that experience frequent temporary faults. This self-powered, electronically controlled, single-phase vacuum fault interrupter is available for installation in new or existing currentproduction ( -R10 or -R11 ) or MacLean Power Systems Type XS Fuse Cutout Mountings. A twoinsulator, branch-feeder style mounting is also available. TripSaver II eliminates the permanent outage which results when the lateral fuse operates in response to a temporary fault. Utilities using fuse blowing will see an improvement in SAIFI without sacrificing MAIFI. And TripSaver II eliminates the momentary interruption on the feeder in instances where the breaker is tripped to save the lateral fuse during a temporary fault. Utilities using fuse saving will see an improvement in MAIFI without sacrificing SAIFI. 2

3 TripSaver II has been tested to, and is in compliance with, IEEE Standards C and C and IEC Standard TripSaver II is manufactured in accordance with a quality system certified to ISO 9001:2000. As shown in the following table, TripSaver II offers a number of advantages over traditional lateral protective devices. Comparison of Lateral Protective Devices Feature/Benefit Single-Phase Hydraulic Recloser Dropout-Style Electronic Sectionalizer TripSaver II Easy to install Low initial price Low installation cost Fault-interrupting capability Easy to reset Electronic control No bypass switch required Light weight compared to oil reclosers No battery backup required Fits in cutout mounting No momentary outage on the main feeder for lateral faults 3

4 TripSaver II s operating sequence TripSaver II supports up to three reclosing operations (four tripping operations in total) before it drops open. A wide variety of time-current characteristic (TCC) curves are available. The open interval between tripping operations is five seconds. The vacuum interrupter resets two seconds after TripSaver II drops open. The operator can then reclose TripSaver II into the mounting. In instances in which a temporary fault is cleared before TripSaver II reaches the end of its operating sequence, TripSaver II will revert to its first TCC curve, i.e., reset after 15 seconds have elapsed since the last reclosing operation. How TripSaver II works for a temporary fault Consider a temporary fault downstream of TripSaver II, as shown in Figure 3. Feeder breaker Figure 4. TripSaver II opens. After five seconds, TripSaver II recloses, restoring power to customers served from the lateral downstream, as shown in Figure 5. Since the fault was temporary and has been cleared, further tripping operations aren t needed. TripSaver II reverts to its first TCC after 15 seconds. TripSaver II Temporary fault Figure 3. Temporary fault. Utilizing its fast TCC curve, TripSaver II opens, as shown in Figure 4. Only customers served from the lateral downstream of TripSaver II experience a momentary interruption. Figure 5. TripSaver II recloses. How TripSaver II works for a permanent fault Consider a permanent fault downstream of TripSaver II, as shown in Figure 6. 4

5 Feeder breaker TripSaver II Permanent fault Permanent fault Figure 6. Permanent fault. Figure 8. TripSaver II recloses. As before, utilizing its fast TCC curve, TripSaver II opens, as shown in Figure 7. Again, only customers served from the lateral downstream of TripSaver II experience a momentary interruption. Since the fault is permanent, TripSaver II performs further tripping operations per the specified TCC curves. For utilities employing fuse saving philosophy, TripSaver II drops open at the end of its operating sequence, in the same manner as a standard fuse cutout providing visual indication that the faulted lateral has been isolated, as shown in Figure 9. The vacuum interrupter resets two seconds after TripSaver II drops open. TripSaver II may then be reclosed by the operator once the fault has been repaired. Permanent fault Figure 7. TripSaver II opens. Figure 9. TripSaver II drops open. TripSaver II recloses, as shown in Figure 8. 5

6 Construction and Features A Birdproof-design insulator higher insulation characteristics than ANSI distribution-cutout standards. Porcelain insulator shown; composite-polymer silicone insulator also available. NEMA Type B and Extended Mounting Brackets are available B Parallel-groove connector tin-plated cast red brass. For ease of connection, accommodates two conductors, even of unlike size D B A C Attachment hooks for Loadbuster Tool it also guides TripSaver II during manual closing E D Upper contact silver-to-silver; stainless-steel spring provides high contact pressure C E F Bumper and Retainer spring-loaded retainer and bumper dampen impact on closing, reducing the possibility of bounce-back Vacuum fault interrupter it is contained inside the upper housing G Trunnion high-strength cast bronze, silver plated. Surfaces around trunnion bear on broad hinge surfaces to keep TripSaver II in alignment during closing. Its special shape facilitates easy removal and reduces vibration F G H H Lower contacts silver-to-silver; provide dual current path, independent of hinge pivot I Mode selector for selecting automatic reclosing or non-reclosing operation. In nonreclosing mode, TripSaver II will operate oneshot-to-lockout, suitable for use when crews are working downstream of TripSaver II I J Liquid-crystal display screen displays TripSaver II status. Six languages are supported J Ice-Breaking Capability TripSaver II is capable of dropping open under ¾-inch (20-mm) ice formation. Sectionalizing Option A sectionalizing option is available for TripSaver II models rated 4 ka. If specified, TripSaver II will operate as a sectionalizer for faults between 4 ka and 6.5 ka. TripSaver II will count the number of operations of the source-side circuit-breaker or recloser, and drop open after the specified number of counts. The counter resets if no sectionalizing event is registered for 120 seconds. 6

7 Ratings Complete Overhead Pole-Top Style TripSaver II For a new installation. Includes TripSaver II, mounting (less mounting bracket), and connectors 50/60-Hz Ratings1 With Porcelain Insulator With Polymer Insulator System Class kv Nom. Max BIL Cont. Amperes, RMS2 Interr., Sym. Leakage Distance to Ground Minimum, Inches (mm) Base Catalog Number Leakage Distance to Ground Minimum, Inches (mm) Base Catalog Number For 50-Hz applications, specify Microprocessor Control for Application on 50-Hz Systems, Catalog Number Suffix -F. 2 Minimum trip current is 5 amperes Z\x (216) M\, (378) P Z\x (216) M\, (378) P (279) (279) (432) a 19 (483) Pa (432) a 19 (483) Pa a Applicable for protection of single-phase-to-neutral circuits only in solidly-grounded-neutral (multi-grounded-neutral) 34.5-kV systems where leakage distance to ground meets user s requirement. Uses 25-kV 150-kV BIL mounting. Complete Branch-Feeder Style TripSaver II For a new installation. Includes TripSaver II, mounting (less backup member and mounting hardware), and connectors System Class 50/60-Hz Ratings1 With Porcelain Insulator With Cypoxy Insulator kv Amperes, RMS2 Leakage Distance to Ground Minimum, Interr., Nom. Max BIL Cont. Inches (mm) Sym For 50-Hz applications, specify Microprocessor Control for Application on 50-Hz Systems, Catalog Number Suffix -F. 2 Minimum trip current is 5 amperes. Base Catalog Number Leakage Distance to Ground Minimum, Inches (mm) Base Catalog Number (610) Z\v (616) E (610) Z\v (616) E (610) a 24 Z\v (616) Ea (610) a 24 Z\v (616) Ea a Applicable for protection of single-phase-to-neutral circuits only in solidly-grounded-neutral (multi-grounded-neutral) 34.5-kV systems where leakage distance to ground meets user s requirement. Uses 25-kV 150-kV BIL mounting. TripSaver II Only For retrofitting in an existing current-production ( -R10 or -R11 ) or MacLean Power Systems Type XS Fuse Cutout Mounting For Use with Type XS Fuse Cutout Mounting 50/60-Hz Ratings1 Basic Catalog Number 89811, 89021, 89031, 89071, SC15HG, 89221, , 89022, 89032, 89072, 89802, 89042, 89052, 89092, SC27SG, 89222, 89223, 99022, System Class 1 For 50-Hz applications, specify Microprocessor Control for Application on 50-Hz Systems, Catalog Number Suffix -F. kv Nom. Max BIL Cont or Minimum trip current is 5 amperes. Amperes, RMS2 Interr., Sym. Base Catalog Number

8 Mounting Bracket Options For Overhead Pole-Top Style TripSaver II Models Item Add Catalog Number Suffix Extended Mounting Bracket, for crossarm, pole, or wall mounting -B NEMA Type B Mounting Bracket, for crossarm mounting - C Backup Member and Mounting Hardware Options For Branch-Feeder Style TripSaver II Models Item Add Catalog Number Suffix Two 3/ /2 bolts -D1 Backup Member with galvanized steel carriage bolts (3 minimum thread), flat washers, lockwashers, and nuts Four 3/ /2 bolts -D2 Two 3/ bolts -D3 Four 3/ bolts -D4 Sectionalizer Mode Option For TripSaver II Models Rated 4 ka Only Item Sectionalizer Mode TripSaver II will operate as a recloser and interrupt fault currents up to 4 ka. For fault currents greater than 4 ka, up to 6.5 ka, TripSaver II will operate as a sectionalizer, and drop open after counting the specified number of source-side circuit breaker or recloser tripping operations. The counter resets if no sectionalizing event is registered for 120 seconds Add Catalog Number Suffix -Snl l Specify the number of source-side circuit breaker or recloser tripping operations, n (1 to 9), that TripSaver II counts up to before dropping open. Time-Current Characteristic Curves Instantaneous Instantaneous Fuse Link K Speed T Speed 6K 6T 10K 20K 30K 40K 50K 65K 80K 100K 10T 20T 30T 40T 50T 65T 80T 100T Cooper Forms 4, 5, 6, FX Type H 1 Discrete pickup currents (5 A through 200 A), and discrete time multipliers (0.1 through 0.9 and 1 through 9) can be selected. Recloser1 Cooper Hydraulic Recloser Type 4H, V4H Type L Type V4L (V4E) Type E Type 4E SEL 351R/651R A A A A A A Inverse (U2) B B B B B B Very Inverse (U3) C C C C C C D D D D Extremely Inverse (U4) Short-Time Inverse (U5) Inverse (C1) Very Inverse (C2) Extremely Inverse (C3) Short-Time Inverse (C5) 8

9 User Interface Indicator appears if TripSaver II trips and drops open on overload Vacuum interrupter status Operating mode Service Soon indicator appears when 10% vacuum interrupter life remains LCD screen and mode selector. Springs help guide mode selector lever to the desired position; colored labels provide visual confirmation. NR mode engaged as shown: upper label completely exposes and lower labels align. The Normal screen shows four operating parameters. Load Current Last Fault Current Operation Counter Vacuum Interrupter Life Remaining Internal Ambient Temperature Sectionalizing Feature Enabled, with Counts Setting The Display screen scrolls through six additional parameters. 9

10 TripSaver II Styles Base Catalog Numbers or Complete Overhead Pole-Top Style TripSaver II rated 15 kv nominal; 15.5 kv maximum; 110 kv BIL; 100 amperes continuous; or amperes interrupting, RMS, symmetrical; 8Z\x inches (216 mm) leakage distance to ground; porcelain mounting. Base Catalog Numbers or Complete Overhead Pole-Top Style TripSaver II rated 25 kv nominal; 29 kv maximum; 125 kv BIL; 100 amperes continuous; or amperes interrupting, RMS, symmetrical; 11 inches (279 mm) leakage distance to ground; porcelain mounting. Base Catalog Numbers or Complete Overhead Pole-Top Style TripSaver II rated 25 kv nominal; 29 kv maximum; 150 kv BIL; 100 amperes continuous; or amperes interrupting, RMS, symmetrical; 17 inches (432 mm) leakage distance to ground; porcelain mounting. Base Catalog Numbers E or E. Complete Branch-Feeder Style TripSaver II rated 15 kv nominal; 15.5 kv maximum; 150 kv BIL; 100 amperes continuous; or amperes interrupting, RMS, symmetrical; 24Z\v inches (616 mm) leakage distance to ground; Cypoxy insulators. 10

11 Handling TripSaver II Overhead Pole-Top Style Shown TripSaver II in dropped-open position Two seconds after TripSaver II drops open, the vacuum interrupter resets. Closing TripSaver II back into mounting TripSaver II can be readily closed back into the mounting using a standard hookstick equipped with an Talon Fuse Handling Fitting or a distribution prong. Opening TripSaver II with Loadbuster If the lateral circuit needs to be de-energized, TripSaver II can be opened using Loadbuster the Loadbreak Tool. 11

12 Specifications Voltage Ratings 15 kv Nominal Operating Voltage (kv) Maximum Design Voltage (kv) Basic Insulation Level (BIL) of mounting kv Nominal Operating Voltage (kv) Maximum Design Voltage (kv)...29 Basic Insulation Level (BIL) of mounting /150 Current Ratings Continuous Current (amperes) All models Symmetrical Interrupting Current (amperes) All models /6 300 Overload Capability 50 C) All models 125 amperes (125%) amperes (150%) Half-Second Current, Symmetrical (amperes) All models 100 amperes Duty Cycle Percent of Maximum Circuit Interrupting Rating Mechanical Life Minimum X/R Ratio Number of Unit Operations Total 68 Minimum Number of Operations Weight, lbs. (kg) 15-kV (110-kV BIL) (10.5) 25-kV (125-kV BIL or 150-kV BIL) (11.3) Printed in U.S.A. Descriptive Bulletin November 19, 2012 Offices Worldwide f