Metal Enclosed Bus Systems
Product Feature
TECHNIBUS bus duct has been developed using over 20 years of proven experience in combination with today's technology and the highest quality materials available to produce the best product available in the industry. Your system is custom designed by trained experts who advise/assist you, to avoid installation and performance problems.
Testing
All equipment is subjected to ANSI/IEEE standard production tests. Design tests are performed on representative samples in accordance with ANSI/IEEE C37.23.
Short Circuit CurrentContinuous Current
WeatherproofDielectric Withstand...... Rated Frequency Withstand
Bus Bar Insulation and DeflectionImpulse Voltage Withstand
Insulation Flame-RetardancePartial Discharge
Insulation Thermal CyclingDew Withstand
Paint Qualification
Conductors
Sized to operate within ANSI/IEEE temperature limitations. Options include:
Copper EPT 110 ASTM Designation B187
Aluminum 6101-T61 ASTM Designation B236
Grounding
Enclosure ground system in compliance with ANSI/IEEE C37.23-7.2 is standard. The minimum cross sectional area of aluminum enclosures provide a continuous ground path which exceeds the capability of 1/2" x 6" copper ground bar. Internal pads are provided at equipment connections for attachment to station grounding system.
Bus Supports
Conductors are braced to suit electrical and mechanical conditions of each installation.
GPO-3 Fiberglass Bus Supports are furnished for 600 VAC and all DC systems.
5 & 15kV systems are supported with molded glass polyester insulators manufactured using UL recognized materials.
Porcelain is standard for 38kV systems and is optional for 5 & 15kV applications at a nominal charge. Additional supports can be easily added to an existing TECHNIBUS system without modifying the bus or enclosure. This unique patented feature allows users to upgrade systems when necessary. 5-38kV class systems feature standard anti-corona devices tested to assure corona free performance beyond operating voltage.
Insulation
Several insulation options are available. Standard low voltage bus systems are not jacketed, 5-38kV conductors, however, are fully insulated and foil tested in accordance with ANSI/IEEE C37.23, Section 6.2.1.4. Silica epoxy resin is standard using the fluidized bed process which provides the highest quality available. High dielectric strength, excellent chemical resistance, durable mechanical characteristics,
130 degrees C thermal rating and high thermal emissivity are distinct advantages this insulation offers. The epoxy resin is bonded to the bus which eliminates air gaps which could initiate corona problems
Adjustment
Enclosure and bus joints are adjustable to compensate for normal installation tolerances and allow for removal of individual bus sections without disassembly of adjacent sections.
Expansion
Flexible enclosure and bus support design minimizes the need for expansion joints. Straight runs less than 80 feet indoor/60 feet outdoor do not require special expansion fittings.
Maintenance Free Bus Joints
Silver-plated copper or tin plated aluminum to maintain low contact resistance without the use of joint compounds. Assembled with high strength hardware including heavy-duty load bearing flat washers which provide over 4000 pounds of clamping force per bolt. Bolt patterns are proportional to current rating. Belleville spring washers are standard for aluminum bus joints.
TECHNIBUS bus joints utilize splice plates that have a cross sectional area equal to or greater than the main bus and operate cooler than overlap bus joints furnished by other manufacturers. Tests performed on overlap joints, having two bars per phase, resulted in 15 degrees C to 20 degrees C temperature rise differentials between bars of the same phase indicating that overlap joints result in poor current distribution. Tests performed on the same system using a splice plate joint design resulted in equal temperature rise between bars by equalizing current distribution.
5kV and 15kV Shipping Splits
Insulated with labor saving removable boots at no additional charge which reduces field insulating labor by up to 90%. No special skills are required to install boots which eliminates quality control concerns common to wrapped joints.
38kV Shipping Splits
Provided with electrical compounds to fill voids around hardware and a semi-conducting tape to eliminate voltage stress prior to the application of 130 degrees C EPR insulating tape and PVC jacketing tape.
Enclosures
Totally enclosed Non-ventilated systems for indoor or outdoor applications furnished complete with condensation control breather/drains. Entirely constructed of non-corrosive non magnetic, high conductivity aluminum which eliminates hysteresis losses, minimizes induced current losses, and shields external structural members from magnetic heating resulting in lower operating costs. Additional information regarding the advantages of aluminum enclosures is available upon request.
Structural aluminum side members with integral strengthening exceeds the strength of formed stressed sheet metal. Exclusive patent pending design allows for attachment of insulators and enclosure assembly without penetrating the enclosure sides with hardware. Covers are removable for inspection of joints, heaters and bus supports.
All field assembly is accomplished with single wrench type fasteners to simplify and reduce field labor.
Finish
Our standard finish is electrostatic/baked method. Salt spray testing for our standard products have been performed in accordance with ASTM test method D2247.
The process is fully automated as the conveyorized product passes through a multi-stage high pressure wash system that cleans the parts and coats each part with iron phosphate for excellent powder paint adhesion and superior rust resistance. The part then passes through a dryoff oven prior to the powder application process in an environmentally controlled clean room.
Finally, the coated part passes through a high temperature infrared/convection oven for the final cure prior to the packaging process. Powder data sheets are available upon request.
Weather Proofing
Assembly hardware is located to eliminate points where weather can directly enter the enclosure. Drip shields are standard for outdoor installations and covers are attached with stainless steel hardware including non-weathering EPDM seal washers. EPDM gasketing offers excellent resistance to sunlight, ultra-violet rays, oxidation and weather. Additionally, concealed gasketing is positioned to prevent hardware penetration which could initiate the deterioration process. Our standard construction meets the weather proof test requirements of ANSI/IEEE C37.23, Section 6.2.5 and rain test for outdoor switchgear ANSI/IEEE C37.20.2, Section 5.2.9.
Screened Breather/Drains
Provided along the enclosure bottom for all non-vented installations to minimize the possible formation of condensation.
Strip Heaters
Standard for outdoor enclosures. Located at access covers to allow easy inspection. Heaters are wired to operate at half voltage for extended life. Heater wire is contained in a flexible metallic conduit. Thermostat control is optional.
Equipment Connections
Custom designed and coordinated to match associated equipment. Connection kits include bolting hardware, adapters, insulating materials and assembly drawings. Optional connection components include:
Braided Flexible Connectors
Removable Boots
Stud Connectors
Current Transformers
Terminal Enclosures
Isolation Flanges
Vapor Barriers
Removable Bus Links
Vibration Collars
Structural Supports
Designed in accordance with American Institute of Steel Construction. Options include: hangers, single and double column, wall braces, and roof supports. Ducts and supports are designed for a nominal 12-15 foot spacing and are adjustable to accommodate site variations. Calculations for outdoor column supports available upon request. Supports are clamped to ducts which eliminate installation alignment problems and field drilling.
Installation Instructions/Field Testing
All shipments include drawings and instructions. All factory assemblies and field assembly kits are assigned identification numbers which are coordinated with the drawings provided.
Low Total Cost
Factory assembled and shipped in lengths up to 24 feet to minimize field assembly labor. Eliminates field labor associated with cable duct systems which usually includes;
Removal of Covers
Partial Disassembly of Supports
Pulling of Cables
Cable Interleaving
Lug Attachment
Stress Wrapping
Reinstallation of Covers
Additional information regarding advantages of Bus bar systems is available upon request.
Special Construction
In addition to our standard products, TECHNIBUS can also furnish special rating or construction to suit your specific application. Consult factory for assistance concerning your specific application.
Revised 11/96