Dry Well Cannister Type CLT, OIL Immersed PTAP-AFH926. Technical Guide Load-break, Dead-break

Transcription

1 Dry Well Cannister Type CLT, OIL Immersed PTAP-AFH926 Technical Guide Load-break,

2 General Description The Drywell Current Limiting Fuse Cannister is a removable fuse assembly for use in single and three phase pad-mounted transformers. The fuse well assembly accepts general purpose current limiting fuses and is available in both load-break and dead-break designs. The combination of the drywell current limiting fuse cannister and the general purpose current limiting fuse provides a reliable, versatile and easily serviced current limiting protection system for transformers. Features and Advantages Test Proven Quality and Reliability The ABB Fuse Cannister has passed a series of design tests which offer verification of the design reliability. The tests are covered in TD and are listed below: 1. Switching Test 2. Fault Close Test 3. Dielectric Test 4. Short Time Current Test 5. Temperature Thermocycle Test 6. Safe Transit Test In addition to the design testing, the following production tests are done: 1: Audit - Dimension check to verify critical dimensions % - Seal test to verify sealing integrity. Current Limiting Capability The Drywell Current Limiting Fuse Cannister will accept general purpose current limiting fuses of the, ELX and GP variety. The current limiting fuse provides instantaneous Fuse Cannister Body Lower Probe Load-break Cannister Lower Contact Arc Quenching Insulators Loadbreak Contact Fuse Cannister Body No Lower Probe. Fuse Slides Into Lower Contact Deadbreak Contact Cannister Lower Contact protection for the system and transformer from faults within the interrupting rating of the fuse. Current limiting fuses offer faster response times and higher interrupting ratings than expulsion type fuses. Load-break Design The Load-break Current Limiting Fuse Cannister has an arc quenching device inside the cannister to permit load-break switching operations. The load make/load break capability of the fuse cannister provides the additional versatility and economy of load switching at the fuse itself without the need for additional switches. Design The dead-break design does not have arc stretching and quenching capability. If a transformer already has a high voltage switch, the dead-break design offers an economical method of providing current limiting fuse protection. The deadbreak design offers all the features of the load-break design except for the loadmake/loadbreak and fault close capability. Drawout The current limiting fuse is removed from the cannister at the front of the transformer using a standard hot stick. Once removed, the fuse can be inspected and/or replaced as necessary without disturbing the seal integrity of the transformer. Straight or Slant Mounting The ABB fuse cannister is available in both straight and slant mounting designs. The slant mounting is especially suited to single phase pad-mount transformer where the slanted design permits for shorter tank depth and a lower profile design. 2 ABB

3 Rugged Fuse The cannister is made up of two basic parts: the fuse cannister body assembly and the draw out assembly. All of the insulating parts are glass reinforced thermoset materials which are both arc and track resistant. Load-break Cannister Cutaway View The cannister body is assembled from glass wound epoxy tubing and a molded thermoset epoxy housing with brass electrical contacts. The upper draw out assembly is made from molded thermoset polyester and stainless steel hook eye and end cap. High Strength Contact Structure The fuse cannister contacts are brass to copper at the bushing lead connection and copper to brass at the cannister to winding connection. The combination of brass and copper provides the necessary conductivity and high strength for the internal lead connections. A spiral spring contact made of a silver plated copper alloy is used at the winding connection contact to insure consistent contact surface and balanced contact pressure. The contact to cannister interface is uniquely designed to provide transformer access to the contacts and yet maintain the seal integrity of the cannister. High Current Withstand Both the load-break and dead-break fuse cannisters are designed to withstand a 10 cycle, 60Hz current of amperes without damage to the cannister or contact structure. This design ensures that both the cannister and contact structure will withstand high current surges without impairing the cannister s ability to meet its functional requirements. Accessories End Cap Cover The end cap cover (451B806G02) is used to insulate the lower lead clamp and end cap assembly of the fuse cannister. The end cap cover is made from a black thermo-plastic polyester, and is designed to fit over the cannister end cap and lead clamp assembly. The end cap is supplied as standard equipment on load-break fuse cannisters. The end cap is not provided with dead-break fuse cannisters and must be ordered separately. Mounting Flange The mounting flange comes in two configurations; straight (5995A52G01), and slant.(5995a53g01). Both flanges are made from zinc plated steel with a yellow chromate sealer. On standard fuse cannisters, the mounting flange is supplied with the cannister as part of the mounting hardware. Cannister KV Rating Tag Hot Stick Eye Bolt Molded-in Gasket Seat Upper Probe Upper Contact Fuse Cartridge Lower Probe Arc Quenching Insulators Lower Contact 8.3 KV End Cap Cover ABB 3

4 Cannister Type Load-break Load-break Load-break Load-break Fuse Type kv To Order Mounting Arrangement Specify Tank Gasket Two different tank gaskets are available depending upon the type of cannister installation. Both the straight (5994A60H01) and slant (5994A60H02) mounting gasket are made from Nitrile. The tank gasket is supplied with the hardware kit on all standard fuse cannisters. - BIL (kv) Continuous Current (Amperes) Style Short Time Current (1.3 asymmetry Factor in Amperes) Number 60 Hz Withstand Voltage (kv) # Load-make/ Load-break Operations at Amperes Style Number 8. 3 Straight A 608C617G Slant A 608C617G24 15 Straight A 608C617G51 15 Slant A 608C617G53 23 Straight A 608C617G35 23 Slant A 608C617G Straight C433G Slant C433G12 15 Straight C433G43 15 Slant C433G44 Printed in USA by Tennessee Industrial Printing Services, Inc. Garter Spring The contact garter springs (51D0562H07) are designed to provide electrical conductivity between the upper corona shield and the upper lead contact assembly and as a field shaper between the upper corona shield and tank wall. The spring is made from stainless steel and is provided as standard equipment on the fuse cannisters listed above. See DS page 14 for garter spring installation instructions. Lead Clamp & Hardware The upper and lower contact clamps are identical. They are made from tin plated steel to resist corrosion during transport and storage before assembly in the transformer. All standard fuse cannisters are provided with two lead clamp assemblies and the necessary mounting nuts, bolts, and washers. See DS pg. 12 (straight) or pg. 13 (slant) for ordering information. ABB Inc S. Cavalier Drive Alamo, TN 38001, USA Telephone: Fax: IZUA en Replaces TPL , May 0

5

6

7

8 Straight Flange Lower Probe (Loadbreak Cannister Only) Varies by Cannister Contact ABB Fuse (Not Included) 5.00 (127.0mm) Mounting Flat 3.90 (99.1mm) Diamter Mounting Hole After Painting Flange Pad 3A34303H02 Flange (Standard - Straight) 451B587H05 Upper Probe Varies by Cannister Contact ABB Cannister See appropriate DS: Loadbreak: DS pg 10 Deadbreak: DS pg 11 Mounting Stud (9.5mm) Diameter 1.00 (25.4mm) Long 4 Required on 6.00 (152.4mm) Bolt Hole Circle Cannister Tank Gasket (Standard - Straight) Straight: 5994A60H07 Spring Clip 1B11118H01 Mounting Nuts & Washers to match mounting studs on tank wall Torque to 60 inlbs. Garter Spring 2 Required 51D0562H13 Tank Wall Clamp Nut 2 Required 608C611H01 Standard items are included with cannister. Clamp Washer 4 Required 608C606H06 Lead Clamp 2 Required 2792A96H02 End Cap Cover (Loadbreak Cannister Only) 451B806G02 Clamp Bolt 2 Required 608C609H04 ABB Inc. Components & Insulation Material TITLE STRAIGHT FUSE CANNISTER INSTALLATION INSTRUCTIONS DIMENSION SHEET: PAGE: REVISION: DIMENSIONS ARE IN INCHES.

9 Fuse (Not Included) Flange (Standard-Slant) 451B587H06 Upper Probe Varies by Cannister Contact ABB Lower Probe (Load-break Cannister Only) Varies by Cannister Contact ABB Flange Pad 3A34303H01 Cannister See Appropriate DS Loadbreak: DS pg 10 Deadbreak: DS pg (3.4mm) Radius Mounting Tab 5.75 (146.1mm) Diameter Mounting Flat Tank Wall 4.34 (110.2mm) Diameter Mounting Hole After Painting Garter Spring 51D0562H13 Slant Flange Mounting Hole End Cap Cover (Loadbreak Cannister Only) 451B806G02 Lead Clamp (2-Standard) 2792A96H02 Mounting Nuts & Washers to match mounting studs on tank wall Torque to 60 inlbs. Spring Clip 1B11118H02 Cannister Tank Gasket (Slant) 5994A60H08 Mounting Stud (9.5mm) Diameter 1.00 (25.4mm) Long, 4 Required on 6.50 (165.1mm) Bolt Hole Circle Clamp Nut (2-Standard) 608C611H01 Clamp Washer (4-Standard) 608C606H06 Clamp Bolt (2-Standard) 608C609H04 ABB Inc. Components & Insulation Material TITLE SLANT FUSE CANNISTER INSTALLATION INSTRUCTIONS DIMENSION SHEET: PAGE: REVISION: DIMENSIONS ARE IN INCHES.

10