Secondary Unit Substations

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1 14 SWITCHGEAR Secondary Unit Substations Overview Siemens offers a wide variety of unit substation designs to meet customer requirements. A unit substation consists of one or more transformers mechanically and electrically connected to and coordinated in design with one or more switchgear or switchboard assemblies. A secondary unit substation is defined as a unit substation whose outgoing section is rated below 1000 volts. A typical secondary unit substation consists of three sections: n Primary: an incoming section that accepts incoming high voltage (2400 to 13,800 volts) line n Transformer: section that transforms incoming voltage down to utilization voltage (600 volts or less) n Secondary: an outgoing section that distributes power to outgoing feeders and provides protection for these feeders (600 volts and less) Standard secondary unit substations consist of: n Medium Voltage Primary n Transformer n Low Voltage Secondary Siemens also offers low voltage unit substations with: n Low Voltage Primary n Transformer n Low Voltage Secondary The primary reason for using a secondary unit substation is to bring power as close as possible to the center of the loads. Another reason is that it provides a system design concept incorporating a wide variety of components that permits tailoring equipment to the needs of the application. A secondary unit substation provides n Reduced power losses n Better voltage regulation n Improved service continuity n Increased functional flexibility n Lower installation cost n Efficient space utilization Every component and assembly of secondary unit substations are designed and engineered as an integral part of a complete system. Primary Switch Primary Switch Liquid Filled Transformer Dry Type Transformer General Switchboard with WL Encased Systems Breakers Type SB3 Switchboard with Fusible Switches Primary Switch Liquid Filled Transformer Type WL Low Voltage Switchgear For more information, please visit or contact your local sales office Siemens Industry, Inc. SPEEDFAX 2011 Product Catalog

2 kv Type SIMOSEC Metal-Enclosed Load Interrupter Primary Switch SIMOSEC Specifications n Extremely compact footprint n Meets ANSI/IEEE C n UL or C-UL listing available n Seismic compliant up to IBC 2003 n High switching capacity operations at 600A - five times higher than ANSI requirements n Gas-insulated, three-position switch\ disconnector, hermetically sealed for life inside a stainless steel vessel n Switch-disconnector combines the functions of a load-interrupter switch(with CLOSED-OPEN indication) and an optional grounding switch (with OPEN-GROUND indication) n Front accessible fuses and outgoing cables, which means type SIMOSEC switches can be placed against the wall and maximize the use of available space n Convenient viewing window for visible verification of primary contact position (visible break) n Standard capacitive voltage indicators to show whether the cable side is energized or not n Integrated mechanical interlocking n Animated mimic diagram (mimic bus) n Main bus at top or bottom to suit application n Configurations: individual feeder switches, transformer primary switches and switch line-ups n Ideal for utility, construction and industrial applications n Over 20 years of field experience with more than 350,000 switch-disconnector units installed n Switch-disconnector contacts maintenance free and sealed for life. n Main bus continuous current rating (row title) (blank 2nd column from left) and 1,200 A in each of three columns on right 14 SWITCHGEAR Dimensions Cable switch CS Fused switch FS Duplex switch Width Single cable or fuse Three cables or double-barrel fuse Two cables + SA or 3-barrel fuse 14.8 (375 mm) 19.7 (500 mm) 29.6 (750 mm) 14.8 (375 mm) 19.7 (500 mm) 29.6 (750 mm) 19.7 (500 mm) (500 mm) 29.6 (750 mm) (500 mm) Depth Height 48.4 (1,230 mm) (2,250-2,850 mm) depending on arrangement Technical Data Rated voltage 5 kv 8.25 kv and 15 kv 27.6 kv Rated frequency 50/60 Hz 50/60 Hz 50/60 Hz Rated short-duration power-frequency withstand voltage 19 kv 36 kv 60 kv Rated lightning-impulse withstand voltage (BIL) 60 kv 95 kv 125 kv Rated short-time withstand current, two seconds Up to 25 ka Up to 25 ka Up to 20 ka Fused short-circuit current rating (FS panels only) Single fuse FS-1 Double fuse FS-2 Triple fuse FS-3 63 ka (to 450E) 63 ka (to two 350E) 63 ka (to three 200E) 63 ka (to 200E) 63 ka (to two 200E) 63 ka (to three 200E) 20 ka 20 ka 20 ka Maximum fused continuous current (not equal to fuse E rating) Switch disconnector Single fuse FS A 165 A 65 A Double fuse FS A 305 A 117 A Triple fuse FS A 430 A 156 A Continuous 600 A 600 A 600 A Interrupting 600 A 600 A 600 A Main bus continuous current rating 1,200 A 1,200 A 1,200 A Siemens Industry, Inc. SPEEDFAX 2011 Product Catalog 14-41

3 High-voltage (HV) Fuse Selection Table General High-voltage (HV) Fuse Selection Table 14 SWITCHGEAR Allowable continuous current (A) Maximum voltage (kv) Fuse type E -rating (open air) FS-1 FS-2 FS GDMSJ10ES 10E GDMSJ15E 15E GDMSJ20ES 20E GDMSJ25ES 25E GDMSJ30ES 30E GDMSJ40ES 40E GDMSJ50ES 50E GDMSJ65ES 65E GDMSJ80ES 80E GDMSJ100ES 100E GDMSJ125ES 125E GFMSJ150ES 150E GFMSJ175ES 175E GFMSJ200ES 200E GFMSJ250ES 250E GFMSJ300ES 300E GFMSJ350ES 350E GFMSJ400ES 400E GFMSJ450ES 450E GDMSJ10ES 10E GDMSJ15ES 15E GDMSJ20ES 20E GDMSJ25ES 25E GDMSJ30ES 30E GFMSJ40ES 40E GFMSJ50ES 50E GFMSJ65ES 65E GXMSJ80ES 80E GXMSJ100ES 100E GXQSJ125ES 125E GXQSJ150ES 150E GXQSJ175ES 175E GXQSJ200ES 200E Example: n 5,000 kva, kv transformer n Full-load current A n Multiplier 1.33 n Current for fuse-size selection = 1.33 x A A n Multiplier of 1.33 for transformer with fan-cooled rating 125% of self-cooled rating (adjust multiplier for differing fan-cooled transformer capability) n Fuse rating = 2 x 175E/phase (FS-2). FS-1: One fuse barrel per phase FS-2: Two fuse barrels per phase FS-3: Three fuse barrels per phase Siemens Industry, Inc. SPEEDFAX 2011 Product Catalog

4 Overview Siemens offers a wide variety of unit substation designs to meet virtually any customer requirement. A unit substation consists of one or more transformers mechanically and electrically connected to, and coordinated with, one or more switchgear or switchboard assemblies. A secondary unit substation is defined as a unit substation whose outgoing section is rated below 1,000 volts. A typical secondary unit substation consists of three sections: n Primary: depending on the specific application, this section accepts medium voltage (2,400 to 27,600 volts) incoming power n Transformer: reduces incoming voltage to utilization voltage (600 volts or less) n Secondary: distributes power to, and provides protection for, outgoing feeders (600 volts and less). SIMOSEC Primary Switch Dry-Type Transformer Type SB3 Switchboard 14 SWITCHGEAR The key benefit of a secondary unit substation is that it economically brings power as close as possible to the loads, minimizing power loss and maximizing voltage regulation. It also enhances flexibility, using a system design concept that integrates a wide variety of components to tailor the equipment to the specific needs of each application. Every component or assembly utilized in secondary unit substations is engineered to be an integral part of a complete system. A secondary unit substation helps you: n Reduce power losses n Enhance voltage regulation n Improve service continuity n Increase functional flexibility n Lower installation costs n Minimize space utilization. SIMOSEC Primary Switch Liquid Filled Type Transformer Type SB3 Switchboard Siemens Industry, Inc. SPEEDFAX 2011 Product Catalog 14-43

5 Transformers: Dry Type VPI/VPE 4 in. 4 in. D Plan view W HV-terminal Danger Fan control panel H HV air terminal chamber (optional) N.P. Fan control when req. LV air terminal chamber (optional) Front Ground bus in. (457 mm) Std. Front view indoor 18 in. (457 mm) Std. W Front view outdoor SWITCHGEAR Type = VPI/VPE Primary Volts = Sec_Volts = Temperature Rise = 150C for Aluminum Windings, 80/115C for Copper Windings Standard kv BIL (HV/LV) = 60/30 for Aluminum Windings, 95/30 for Copper Windings Table 1 Low Voltage Switchgear or Switchboard Coordination Winding Material KVA Height (Inches) Width (Inches) Depth (Inches) Weight (Pounds) Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Copper Copper Copper Copper Copper Copper Copper Copper Copper Copper Siemens Industry, Inc. SPEEDFAX 2011 Product Catalog

6 Transformers: Dry Type Cast Coil Type = Cast Coil Primary Volts = Sec_Volts = Temperature Rise = 80/115C for Both Aluminum & Copper Windings Standard kv BIL (HV/LV) = 60/30 for Aluminum Windings, 95/30 for Copper Windings Table 2 Low Voltage Switchgear or Switchboard Coordination Winding Material KVA Height (Inches) Width (Inches) Depth (Inches) Weight (Pounds) Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum Copper Copper Copper Copper Copper Copper Copper Copper Copper Copper SWITCHGEAR Siemens Industry, Inc. SPEEDFAX 2011 Product Catalog 14-45

7 Transformers: Liquid Filled Type Top view Elevation H G 8 J H 3 H 2 H 1 X 3 X 2 X 1 X 0 C D E F A SWITCHGEAR 14 B Unit Type Substation Transformer Primary Volts = 25kV and below, Secondary Voltage = 5kV and below Table 3 Liquid-Filled 55/65 C Rise Aluminum Windings Copper Windings Drawing Dimensions (in.) kva A B C D E F G H J Gallons Of Fluid Approx. Total Weight (lbs.) (With Fluid) Gallons Of Fluid Approx. Total Weight (lbs.) (With Fluid) , , Weights, gallons of fluid and dimensions are for reference only, and not for construction. Please contact Siemens Industry Inc. for exact dimensions Siemens Industry, Inc. SPEEDFAX 2011 Product Catalog

8 Type WL Low Voltage Switchgear Substation Secondaries Siemens type WL low-voltage, metalenclosed switchgear is designed, constructed and tested to provide superior power distribution, power monitoring and control. At the heart of the type WL low voltage switchgear is the world class Siemens type WL breaker. Siemens type WL low-voltage switchgear can be utilized in the following applications: n Industrial n Institutional n Critical power n Utility and co-generation n Commercial. Product Scope n Equipment ratings: 635 Vac maximum Three-phase, three-wire Three-phase, four-wire 50/60 Hz 6,000 A maximum horizontal bus 5,000 A maximum vertical bus. n Enclosure options: NEMA 1 indoor NEMA 3R outdoor walk-in NEMA 3R outdoor non walk-in. 14 SWITCHGEAR Exclusive features Generator/utility protection sets 24/7/365 power availability is critical for some systems. On-site generation capabilities are becoming more and more common. Type WL digital electronic trip units allow the system designer to precisely tailor trip settings for the most demanding requirements. The Siemens type WL 776 trip unit allows one set of trip settings for a fully loaded utility feed and, with a simple contact closure, the trip unit toggles to a second trip set tailored to provide optimal generator protection. The wide range of settings allows the type WL to provide protection for a minimal generator capacity for only essential loads, through full backup for an entire facility. This dual utility/generator protection capability in a single circuit breaker allows the system designer unparalleled, cost effective flexibility. For more information, visit our web site at: Extended instantaneous protection (EIP) This patent pending type WL trip unit feature allows the system designer to achieve full selective trip coordination up to the short-time rating of the frame, while also allowing application of the circuit breaker up to the interrupting rating of the frame. EIP allows the type WL breaker to be applied up to the full withstand rating of the circuit breaker, for complete coordination, with a minus 0% short-time band tolerance up to 85 ka on Frame Size II and 100 ka on Frame Size III. Above fault currents of 20-percent higher than the full short-time rating, the type WL circuit breaker is self-protecting, and the EIP function will trip the circuit breaker instantly to protect the frame and the system from these extremely high currents (as high as 150 ka on Frame Size III). An added benefit is that arc flash energy is greatly reduced in this high- current region due to EIP s instantaneous trip response. Industry standards Type WL switchgear with power circuit breakers are designed, tested and constructed in accordance with: n UL 1558 Metal-Enclosed Low- Voltage Power Circuit Breaker Switchgear n ANSI C Metal-Enclosed Low- Voltage Power Circuit Breaker Switchgear. Type WL drawout circuit breakers are designed for continuous operation at 100-percent of their current rating without the need for external heat sinks, and are in accordance with: n UL 1066 Low-Voltage AC and DC Power Circuit Breakers Used in Enclosures n ANSI C37.13 Low-Voltage AC Power Circuit Breakers Used in Enclosures. Switchgear Secondary Note: See Pages to for complete details concerning WL Low Voltage Switchgear unit substation secondaries. Siemens Industry, Inc. SPEEDFAX 2011 Product Catalog 14-47

9 Switchboard Substation Secondaries 14 SWITCHGEAR Product Overview Siemens modular front connected switchboard design provides a broad range of features and capabilities for a wide range of applications. Every aspect of design of Siemens switchboards has been aimed at improving layout convenience, reducing installation costs and minimizing the impact and cost of changes to the system. Siemens switchboards provide a rugged design and the flexibility necessary in electrical systems for all types of applications, some examples are: n Industrial plants n High-rise complexes n Hospitals n Commercial buildings Standards and Certifications Siemens switchboards are designed, tested and constructed in accordance with: n UL891 Switchboards n NEMA PB-2 n Seismially qualified n Other equipment is UL listed as applicable Features & Benefits Siemens switchboards ratings and features include: n Up to 6000 ampere main bus rating n Up to 600 volts AC n Bus bracing up to 200KAIC n Copper or aluminum bussing n Temperature or density rated bussing n Type 1 and Type 3R enclosures n Main and branch circuit breakers and fusible switches n Thermal magnetic and solid state circuit breakers n Surge protective devices n Utility metering provisions n ACCESS power monitoring on mains and branches n Ground fault protection on mains and branches n Busway and transformer connections n Protective relaying n Two and three device autothrowover scheme Further Switchboard Information See Section 13 for complete details concerning SB3 front-connected switchboard unit substation secondaries Siemens Industry, Inc. SPEEDFAX 2011 Product Catalog

10 Indoor Dry Type Transformer Sketch Page Plan view Transformer 2 D Top and bottom conduit W Restricted Area 14 SWITCHGEAR Front view 19.7" (500 mm) 38" (965 mm) 38" (965 mm) Type SB3 switchboard digital meter type SPD module Unit space 100.4" (2,550 mm) 90" (2,286 mm) Section #1 Section #2 Primary Switch requires front access for top cable entry terminations. Transformer requires access from the front and 12 (305 mm) on the back side for ventilation space. Primary lug location See page 5 for transformer dimensions. Siemens Industry, Inc. SPEEDFAX 2011 Product Catalog 14-49

11 Indoor Liquid Filled Transformer Sketch Page Plan view 32.0 (813 mm) 22.0 (559 mm) 22.0 (559 mm) 14 SWITCHGEAR D 48.4 (1,229 mm) (500 mm) H3 H2 H1 Transformer 2 X3 X2 X1 X0 Maximum available space in top or bottom for customer's cables (800 mm) Space for secondary leads from above. Space for secondary leads from below. Maximum available space in top or bottom for customer's cables (800 mm) Space for secondary leads from above. Space for secondary leads from below. Maximum available space in top or bottom for customer's cables (800 mm) Space for secondary leads from above. Space for secondary leads from below (1,778 mm) Front view 32.0 (813 mm) 22.0 (559 mm) 22.0 (559 mm) W Metering/SPD Main breaker (2,550 mm) Liquid filled transformer (2,596 mm) Section #1 Section #2 Section #3 Primary Switch Primary requires Switch front requires access front for access top cable for top entry cable entry terminations. terminations. Transformer requires access from the front and 12" (305 mm) on the back side for ventilation space. Transformer requires access from the front and 12 (305 mm) on the back side for ventilation space. Primary lug locations. See page 6 for transformer dimensions Siemens Industry, Inc. SPEEDFAX 2011 Product Catalog

12 Outdoor Liquid Type Transformer Sketch Page Plan view 42.7 (1,085 mm) 59.9 (1,521 mm) 1 H3 H2 H1 H3 H2 H1 D X0 X1 X2 X3 Low voltage switchgear (3,150 mm) Allow 6 clearance for door swing Door Walk-in aisle Door 14 SWITCHGEAR Front view W 76.8 (1,951 mm) 30.2 (767 mm) Liquid filled 2 transformer (2,619 mm) Outdoor type SIMOSEC switch (2,893 mm) Section #1 Section #2 Section #3 Primary lug locations. See page 6 for transformer dimensions. Siemens Industry, Inc. SPEEDFAX 2011 Product Catalog 14-51

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