BACKGROUND

Steelworks completing facility and production increases, requiring switchgear updates for load (capacity increase)

PROJECT DELIVERABLES

• Implement new MV service into existing building with lowest facility impact
• Highest capacity (current rating) per phase
• Custom design thru interactive project development
• Scheduling coordination with other time accelerated facility projects
• On-site construction supervision

SIS BUS BAR RATINGS and DIMENSIONS

• Rated voltage: 24kV, 50Hz, PFWV 50kV, 1.2/50us 125kV (lightning impulse)
• Rated current: 6000A, ITHERMALSC 40kA for 1s, IDYNAMICSC 100kA
• CU conductor, power dissipation 195W/m/phase
• WEIGHT 53kg/m, phase center spacing 600mm, OD 189mm

SIS SYSTEM CAPABILITIES

VOLTAGE CLASS (kV): 40.5
CURRENT RATING (A): 8000

General Specifications and Operating Requirements

• RESIN IMPREGNATED PAPER (RIP) technology
• Maximum system voltage and current
• Ambient temperature
• Routing and clearance
• Equipment connections and non SIS bus interconnections
• Indoor vs Outdoor installations
• Support structures to include seismic compliance

Once the bus bar segments are manufactured according to proven RIP processes for vacuum impregnation and resin curing, each bus bar segment and connection sleeve is individually tested according to IEC 60137, Insulated Bushings for Alternating Voltages above 1000V (comparable to ANSI / IEEE C57.19.00 and IEEE C57.19.01) to ensure acceptable test levels for power frequency, partial discharge, capacitance, and loss factors. The test criterion is the essential element of verifying a void-free insulation structure that will lead to a partial discharge-free operation.

All RITZ SIS Bus Bar voltage class designs and current capacity ratings have been verified through type testing procedures, which are also covered under IEC 60137, according to the following test regimen:

1. Power frequency test and PD measurements
2. Impulse voltage test
3. Power frequency test and PD measurements repeated
4. Temperature rise test
5. Temperature cycling
6. Power frequency test and PD measurements repeated