{"id":50509,"date":"2019-01-22T10:42:26","date_gmt":"2019-01-22T18:42:26","guid":{"rendered":"https:\/\/electricalnews.com\/?p=50509"},"modified":"2019-02-04T12:43:04","modified_gmt":"2019-02-04T20:43:04","slug":"improving-on-the-original-westinghouse-iso-phase-bus-design","status":"publish","type":"post","link":"https:\/\/electricalnews.com\/improving-on-the-original-westinghouse-iso-phase-bus-design\/","title":{"rendered":"Improving on the Original Westinghouse Iso-Phase Bus Design"},"content":{"rendered":"

\"Improving<\/a><\/p>\n

by\u00a0Del Williams, Power PR<\/p>\n

 <\/p>\n

Not only does the Westinghouse design live on, but iterative improvements to insulators, mountings and housings make this IPB design even more rugged and reliable<\/p>\n

Isolated-phase bus (IPB) systems are the critical first link in the power transmission chain.\u00a0 As a highly reliable method of construction for moving bulk electrical power,<\/p>\n

Iso Phase Bus Duct systems are the super highways that carry a power plant\u2019s very large amperage between the generator\u2019s output bushings and its associated main step-up (GSU) transformer.\u00a0 IPBs are typically rated from 6,000 to 45,000 amps with lower amperage tap connections to excitation and auxiliary transformers as may be needed.<\/p>\n

Given its critical role, IPBs must provide a very high degree of rugged reliability and fault avoidance to keep power generation facilities operational without outages, downtime or severe equipment damage.\u00a0 Failure is simply not an option.<\/p>\n

By its very definition, IPBs are designed to provide protection from faults by carrying each phase of current on a conductor mounted within its own separately enclosed, grounded metal housing.\u00a0 The conductors are usually hollow aluminum tubes supported within the housing on, hung or between stand-off insulators.\u00a0 Due to the heat generated, the housings may be self-cooled or force-cooled so that the IPB always operates within the maximum allowable top temperature as specified by IEEE\/ANSI.<\/p>\n

For decades, IPBs have been based on original designs from the major OEMs such as General Electric (GE) and Westinghouse that dominated the marketplace.\u00a0 Despite the exit of both GE and Westinghouse from the IPB market, some of the original designs live on through direct successor companies.<\/p>\n

One such successor company is Crown Electric Eng. & Mfg. LLC of Middletown Ohio. Originally founded by the former Westinghouse plant General Manager and Materiel Manager, Crown Electric engineers, designs, fabricates, installs, maintains, repairs and uprates Iso Phase Bus and large bus duct systems.<\/p>\n

After purchasing ownership from Crown Electric\u2019s founding generation, the current owners of Crown invested heavily to build and equip the newest most modernized IPB factory in North America in Middletown, Ohio \u2013 just a short drive from the old Westinghouse location.<\/p>\n

As a successor of the Westinghouse heritage – Crown Electric has continued to improve on the original Westinghouse design with refinements to IPB insulators, insulator mountings and to the continuous housing assembly \u2013 among others.\u00a0 These iterative improvements continue to strengthen the well-known and respected reputation for rugged reliability of the Westinghouse-based IPB design.<\/p>\n

 <\/p>\n

Unique Insulators and Insulator Mounting System – Among the design features that are critical to IPB\u2019s are the support insulators that hold the heavy-gauge, high amperage conductors in place. These electrical stand-offs must withstand high temperatures, worse case mechanical fault forces and electrical stresses regardless of the IPB\u2019s operating conditions and environment. Salt, moisture, coal dust and ambient particulate can all be present and potentially accumulate within the housing.<\/p>\n

In the IPB design from Crown Electric, high strength, high creep porcelain insulators are used to provide better resistance against tracking to ground.\u00a0 The insulators also have\u00a0 carefully chosen dew point ratings so as to eliminate potential failures associated with environmental moisture and condensation.\u00a0 This totally passive \u201cbelt and suspenders\u201d approach ensures this modern version of the Westinghouse design never loses its nameplate rating.<\/p>\n

Unlike designs requiring the introduction of auxiliary forced pressurization to control condensation, this approach negates the needs for costly space heaters and pressurization systems that are mandatory for others.<\/p>\n

If IPB conductors could magically be suspended in the center of the housings, voltage withstand would never be an issue.\u00a0 But until that time comes, stand-off insulators are required to center and support the IPB conductors.<\/p>\n

Because each IPB support insulator is ultimately a potential point of tracking, each additional insulator also statistically increases the potential points of creepage paths to ground (due to dirt or a crack) and failure.\u00a0 In other words, the fewer the number of insulators, the higher the reliability.\u00a0 By maximizing insulator strength to control both static and fault forces, the required number of points for mounting and points of possible tracking are minimized.<\/p>\n

In this regard, Crown Electric\u2019s Insul-Mount™ support design results in the fewest required insulators per linear span.\u00a0 Each stand-off insulator is mounted within a welded aluminum casting (known as a \u201cwindow\u201d). This \u201cwindow\u201d design provides superior ease of insulator access, facilitates cleaning of the insulators in place without the need for removal, as well as visual inspection of the mounting hardware and the local internal IPB conductor.<\/p>\n

Most other IPB designs require the opening of an insulator\u2019s mounting \/ cover plate and the complete removal of that insulator before it can be inspected and cleaned.\u00a0 This is a tedious and time-consuming process which also increases the possibility of the insulator being dropped or in other ways damaged when removed.\u00a0 Additionally, re-installing of the stand-off insulator covers and their mating gaskets can lead to re-sealing issues with an associated continuous leakage of air.<\/p>\n

Continuous Housings – Continuous housings are fabricated from lightweight aluminum sheets rolled and then seam welded to the appropriate diameter for each rating.\u00a0 Cylindrical sections are butt joined by various perimeter welding techniques to maximum strength and conductivity, creating an effective weather tight enclosure that protects conductors and support insulators from the surrounding environmental conditions.\u00a0 These lightweight IPB sections are specifically engineered to be shipped in the greatest practical lengths with fewer joints to field weld.<\/p>\n

Unlike older non-continuous designs, continuous IPB has more inherent rigidity and structural strength, creating a self-supporting framework.\u00a0 Simple hangers or mounting feet (aka \u2013 \u201csaddles\u201d) can easily carry the weight of long IPB spans.<\/p>\n

With a continuous IPB design, the enclosure acts as its own ground plane, eliminating the need for a separate ground bus.\u00a0 The enclosure is at ground potential over its entire length so a single connection to the station ground can usually provide complete grounding.<\/p>\n

A continuous housing design eliminates the electrically isolated sections associated with older non-continuous designs.\u00a0 As there is no voltage potential between enclosure sections, failures due to inter-sectional arcing is eliminated.<\/p>\n

The continuous house design also inherently neutralizes its own conductor flux; thereby shielding nearby support steel and control wiring from the severe magnetic effects of stray loss heating and unintended control signal impingement.<\/p>\n

With power generation facilities so dependent on reliable IPB systems, plant engineers and maintenance managers have a responsibility to ensure serious faults will not occur that can harm personnel or connected capital equipment.\u00a0 By taking advantage of significant Crown Electric design improvements that build on the already reliable, well established Westinghouse foundations, Iso Phase Bus duct has never been more rugged or reliable.<\/p>\n

For more information:\u00a0 call (513) 539-7394; email: info@crown-electric.com or sales@crown-electric.com; visit www.crown-electric.com<\/a>; or write to Crown Electric Engineering and Manufacturing LLC at 175 Edison Dr., Middletown, OH 45044.<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

by\u00a0Del Williams, Power PR   Not only does the Westinghouse design live on, but iterative improvements to insulators, mountings and housings make this IPB design<\/p>\n","protected":false},"author":53,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_cbd_carousel_blocks":"[]","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[311],"tags":[],"class_list":["post-50509","post","type-post","status-publish","format-standard","hentry","category-contributor-blogs"],"yoast_head":"\nImproving on the Original Westinghouse Iso-Phase Bus Design -<\/title>\n<meta name=\"robots\" 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