Secondary Unit Substations
SWITCHGEAR
14
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.
General
Primary Switch
Liquid Filled Transformer
Dry Type Transformer
Switchboard with WL Encased
Systems Breakers
Type SB3 Switchboard with
Fusible Switches
Primary Switch
Liquid Filled Transformer
Primary Switch
Type WL Low Voltage
Switchgear
For more information, please visit http://automation.usa.siemens.com/consultant/ or contact your local sales office.
14-40
Siemens Industry, Inc. SPEEDFAX™ 2011 Product Catalog
Siemens Unit Substation Solutions
5–27.6 kV Type SIMOSEC Metal-Enclosed Load Interrupter Primary Switch
SIMOSEC Specifications
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
n
14
SWITCHGEAR
Extremely compact footprint
n Meets ANSI/IEEE C37.20.3
n UL or C-UL listing available
n Seismic compliant up to IBC 2003
n High switching capacity - 100 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
Dimensions
Width
Single cable or fuse
Three cables or double-barrel fuse
Two cables + SA or 3-barrel fuse
Cable switch CS
Fused switch FS
Duplex switch
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) + 19.7” (500 mm)
29.6” (750 mm) + 19.7” (500 mm)
Depth
48.4” (1,230 mm)
Height
88.6 - 100.4” (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
Single fuse FS-1
325 A
165 A
65 A
Double fuse FS-2
575 A
305 A
117 A
Triple fuse FS-3
600 A
430 A
156 A
Continuous
600 A
600 A
600 A
Interrupting
600 A
600 A
600 A
1,200 A
1,200 A
1,200 A
Maximum fused continuous current (not equal to fuse E
rating)
Switch disconnector
Main bus continuous current rating
Siemens Industry, Inc. SPEEDFAX™ 2011 Product Catalog
14-41
Siemens Unit Substation Solutions
High-voltage (HV) Fuse Selection Table
General
High-voltage (HV) Fuse Selection Table
Allowable continuous current (A)
FS-1
FS-2
FS-3
5.5
55GDMSJ10ES
10E
10
5.5
55GDMSJ15E
15E
15
5.5
55GDMSJ20ES
20E
20
5.5
55GDMSJ25ES
25E
25
5.5
55GDMSJ30ES
30E
30
5.5
55GDMSJ40ES
40E
40
5.5
55GDMSJ50ES
50E
50
5.5
55GDMSJ65ES
65E
65
5.5
55GDMSJ80ES
80E
80
5.5
55GDMSJ100ES
100E
100
14
Fuse type
5.5
55GDMSJ125ES
125E
120
5.5
55GFMSJ150ES
150E
150
SWITCHGEAR
Maximum voltage (kV)
E -rating
(open air)
5.5
55GFMSJ175ES
175E
164
5.5
55GFMSJ200ES
200E
183
327
5.5
55GFMSJ250ES
250E
220
390
5.5
55GFMSJ300ES
300E
241
429
598
5.5
55GFMSJ350ES
350E
269
478
600
5.5
55GFMSJ400ES
400E
302
536
600
5.5
55GFMSJ450ES
450E
325
575
600
17.5
175GDMSJ10ES
10E
10
17.5
175GDMSJ15ES
15E
15
17.5
175GDMSJ20ES
20E
20
17.5
175GDMSJ25ES
25E
25
17.5
175GDMSJ30ES
30E
30
17.5
175GFMSJ40ES
40E
40
17.5
175GFMSJ50ES
50E
50
17.5
175GFMSJ65ES
65E
59
17.5
175GXMSJ80ES
80E
73
17.5
175GXMSJ100ES
100E
85
17.5
175GXQSJ125ES
125E
112
17.5
175GXQSJ150ES
150E
123
238
336
15.5
155GXQSJ175ES
175E
167
310
420
15.5
155GXQSJ200ES
200E
165
305
430
207
Example:
n 5,000 kVA, 12.47 kV transformer
n Full-load current 231.5 A
n Multiplier 1.33
n Current for fuse-size selection =
1.33 x 231.5 A - 308 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
Two fuse barrels per phase
 FS-3: Three fuse barrels per phase
 FS-2:
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Siemens Industry, Inc. SPEEDFAX™ 2011 Product Catalog
Siemens Unit Substation Solutions
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.
14
SIMOSEC Primary Switch
Dry-Type Transformer
Type SB3 Switchboard
SIMOSEC Primary Switch
Liquid Filled Type Transformer
Type SB3 Switchboard
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.
Siemens Industry, Inc. SPEEDFAX™ 2011 Product Catalog
14-43
SWITCHGEAR
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).
Siemens Unit Substation Solutions
Transformers: Dry Type — VPI/VPE
4 in.
4 in.
D
Plan view
W
HV-terminal
SWITCHGEAR
14
H
Fan
control
when req.
HV
air
terminal
chamber
(optional)
N.P.
18 in.
(457 mm)
Std.
Ground
bus
W
Front view
outdoor
= VPI/VPE
= 2400-13800
= 208-600
= 150C for Aluminum Windings, 80/115C for Copper Windings
= 60/30 for Aluminum Windings, 95/30 for Copper Windings
Table 1 Low Voltage Switchgear or Switchboard Coordination
Winding Material
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Copper
Copper
Copper
Copper
Copper
Copper
Copper
Copper
Copper
Copper
14-44
KVA
300
500
750
1000
1500
2000
2500
3000
3750
5000
300
500
750
1000
1500
2000
2500
3000
3750
5000
Fan
control
panel
Front
LV
air
terminal
chamber
(optional)
18 in.
(457 mm)
Std.
Front view
indoor
Type
Primary Volts
Sec_Volts
Temperature Rise
Standard kV BIL (HV/LV)
Danger
Height
(Inches)
Width
(Inches)
90
90
90
90
96
102
108
108
112
118
90
90
90
96
102
108
118
118
126
132
90
90
90
102
102
102
112
118
126
132
90
96
102
102
108
112
126
132
132
138
Siemens Industry, Inc. SPEEDFAX™ 2011 Product Catalog
Depth
(Inches)
54
54
54
60
60
60
60
60
66
66
54
60
60
60
60
60
60
60
66
66
Weight
(Pounds)
4600
4800
5800
7000
9200
11000
12200
14100
15800
17000
6000
6400
8000
9700
13200
17400
19000
22000
27000
30000
Siemens Unit Substation Solutions
Transformers: Dry Type — Cast Coil
Type
Primary Volts
Sec_Volts
Temperature Rise
Standard kV BIL (HV/LV)
= Cast Coil
= 2400-13800
= 208-600
= 80/115C for Both Aluminum & Copper Windings
= 60/30 for Aluminum Windings, 95/30 for Copper Windings
Table 2 Low Voltage Switchgear or Switchboard Coordination
Winding Material
Width
(Inches)
90
90
90
96
102
108
112
118
126
132
90
90
90
96
102
108
118
126
126
132
90
90
96
102
108
112
126
132
138
144
90
96
102
112
118
118
126
132
144
160
Depth
(Inches)
54
54
60
60
60
60
60
60
66
66
60
60
60
60
60
66
66
66
66
66
Weight
(Pounds)
5500
6300
7800
9500
11500
13800
16200
19200
25000
28000
6200
7000
9100
10600
14300
18200
19500
23500
28000
35000
Siemens Industry, Inc. SPEEDFAX™ 2011 Product Catalog
SWITCHGEAR
300
500
750
1000
1500
2000
2500
3000
3750
5000
300
500
750
1000
1500
2000
2500
3000
3750
5000
Height
(Inches)
14
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Copper
Copper
Copper
Copper
Copper
Copper
Copper
Copper
Copper
Copper
KVA
14-45
Siemens Unit Substation Solutions
Transformers: Liquid Filled Type
Elevation
Top view
H
8
G
C
X3
X2
X1
X0
H3
J H
2
D
E
F
SWITCHGEAR
14
H1
A
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
Drawing Dimensions (in.)
kVA
500
750
1000
1500
2000
2500
3750
5000
7500
10,000
12,000
A
B
C
D
E
F
G
H
J
66
75
75
75
85
85
85
99
99
99
99
51
59
67
59
67
75
75
87
95
103
103
26
26
26
59
67
68
70
72
74
76
82
52
52
52
80
90
92
120
144
148
152
164
45
55
55
55
55
55
65
65
75
75
75
45
55
55
55
55
55
65
65
75
75
75
30
34
38
34
38
42
42
48
52
56
56
60
68
76
68
76
84
84
96
104
112
112
35
35
35
35
39
41
45
49
53
57
61
Weights, gallons of fluid and dimensions are for reference only, and not for construction.
Please contact Siemens Industry Inc. for exact dimensions
14-46
Siemens Industry, Inc. SPEEDFAX™ 2011 Product Catalog
Gallons Of
Fluid
300
360
420
400
520
570
790
1050
1320
1740
1850
Approx. Total
Weight (lbs.)
(With Fluid)
5600
7000
8400
9500
12000
14600
20500
26000
35000
43000
49000
Copper Windings
Gallons Of
Fluid
310
370
430
420
500
590
830
1090
1360
1780
1880
Approx. Total
Weight (lbs.)
(With Fluid)
5900
7400
8800
10000
12800
14900
21500
28000
37000
45000
50000
Siemens Unit Substation Solutions
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.
14
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.
Enclosure options:
NEMA 1 indoor
NEMA 3R outdoor walk-in
NEMA 3R outdoor non walk-in.
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.
SWITCHGEAR
n
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.
For more information, visit our web site at:
www.usa.siemens.com/switchgear.
Industry standards
Type WL switchgear with power circuit
breakers are designed, tested and
constructed in accordance with:
n UL 1558—Metal-Enclosed LowVoltage Power Circuit Breaker
Switchgear
n ANSI C37.20.1—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 14-52 to 14-61 for complete
details concerning WL Low Voltage
Switchgear unit substation secondaries.
Siemens Industry, Inc. SPEEDFAX™ 2011 Product Catalog
14-47
Siemens Unit Substation Solutions
SWITCHGEAR
14
Switchboard Substation Secondaries
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
n
n
n
Industrial plants
High-rise complexes
Hospitals
Commercial buildings
Standards and Certifications
Siemens switchboards are designed,
tested and constructed in accordance
with:
Features & Benefits
Siemens switchboards ratings and
features include:
n
n
n
n
n
n
n
n
n
n
n
UL891 – Switchboards
NEMA PB-2
Seismially qualified
Other equipment is UL listed as
applicable
14-48
n
n
n
Up to 6000 ampere main bus rating
Up to 600 volts AC
Bus bracing up to 200KAIC
Copper or aluminum bussing
Temperature or density rated bussing
Type 1 and Type 3R enclosures
Main and branch circuit breakers and
fusible switches
Thermal magnetic and solid state
circuit breakers
Surge protective devices
Utility metering provisions
Siemens Industry, Inc. SPEEDFAX™ 2011 Product Catalog
n
n
n
n
n
ACCESS power monitoring on mains
and branches
Ground fault protection on mains and
branches
Busway and transformer connections
Protective relaying
Two and three device autothrowover
scheme
Further Switchboard
Information
See Section 13 for complete details
concerning SB3 front-connected
switchboard unit substation
secondaries.
Siemens Unit Substation Solutions
Indoor Dry Type Transformer
Sketch Page
Plan view
38.0
Transformer 38.0
Top and bottom
conduit
D
58.0
48.4
14
19.7
Restricted
Area
W
SWITCHGEAR
Front view
19.7"
(500 mm)
38"
(965 mm)
Type SB3
switchboard
digital meter
type SPD module
38"
(965 mm)
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
Siemens Unit Substation Solutions
Indoor Liquid Filled Transformer
Sketch Page
Plan view
31.5”
(800 mm)
22.0”
(559 mm)
Maximum available
space in top or bottom
for customer's cables.
X3
31.5”
(800 mm)
22.0”
(559 mm)
Maximum available
space in top or bottom
for customer's cables.
H3
Maximum available
space in top or bottom
for customer's cables.
32.0”
(813 mm)
31.5”
(800 mm)
Transformer 14
D
X2
48.4”
(1,229 mm)
H2
X1
X0
H1
SWITCHGEAR
70.0”
(1,778 mm)
Space for secondary
leads from above.
Space for secondary
leads from above.
Space for secondary
leads from above.
Space for secondary
leads from below.
Space for secondary
leads from below.
Space for secondary
leads from below.
22.0”
(559 mm)
22.0”
(559 mm)
19.7”
(500 mm)
Front view
32.0”
(813 mm)
W
Metering/SPD
Main breaker
100.4”
(2,550 mm)
Liquid filled
transformer
102.2”
(2,596 mm)
Section #1
Section #2
Switch
requires
front
for topentry
cable entry
terminations. Transformer requires access from the front and 12" (305 mm)
Primary Switch Primary
requires
front
access
foraccess
top cable
terminations.
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.
14-50
Siemens Industry, Inc. SPEEDFAX™ 2011 Product Catalog
Section #3
Siemens Unit Substation Solutions
Outdoor Liquid Type Transformer
Plan view
Sketch Page
42.7”
(1,085 mm)
H3
59.9”
(1,521 mm)
H2
H3
X0
D
H2
X1
Low voltage switchgear
X2
H1
X3
H1
124.0”
(3,150 mm)
14
Allow 6” clearance
for door swing
SWITCHGEAR
Walk-in
aisle
Door
Door
Front view
76.8”
(1,951 mm)
W
30.2”
(767 mm)
Liquid filled transformer
Outdoor
type
SIMOSEC
switch
113.9”
(2,893 mm)
103.1”
(2,619 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