P
P
O W E R
R O T E C T I O N
Liebert
®
K
i
B
i
i
B
i
Isolation Transformer
15 - 300kVA Three Phase
PACKAGED ISOLATION
AND
SURGE SUPPRESSION
Common mode noise and high energy transients can
easily disrupt the operation of sensitive electronic
equipment. Poor quality power prone to this type of
interference can cause problems in all sorts of
environments, including telecommunications and
data centres, medical units, CAS/CAM networks, and
process control operations.
However, a Liebert Isolation Transformer can play an
important role in building power distribution by
reducing common mode noise, and its surge
suppression system will minimise any problems
caused by high-energy transients. It can also be used
as a bypass transformer for UPS installations.
Noise attenuation of 140dB is achieved with doubleshielded copper isolation transformers. The surge
suppression network reduces high-speed high-energy
transients and HF noise in the normal mode. Six full
capacity taps allow compensation of input voltages
of +5% to -10% of nominal without derating. K-rated
GIVING SENSITIVE ELECTRONIC
SYSTEMS EVEN GREATER
PROTECTION
transformers are also available if additional non-linear
load capability is required.
Liebert Isolation Transformers are available in a wide
range of capacities, from 15kVA up to 300kVA.
■ Superior noise attenuation
■ Copper windings for high efficiency and
reliability
■ Surge suppression network
■ K-rated transformers available
■ Voltage compensation taps
■ Computer grade single-point ground
■ Liebert is an ISO9000 company
L
P
C
I E B E R T
P
O W E R
O R P O R A T I O N
R O T E C T I O N
Liebert
®
K e e p i n g B u s i n e s s i n B u s i n e s s™
Isolation Transformer
TECHNICAL DATA
B
Isolation Transformer 15 - 300kVA Three Phase
kVA
15
20
30
50
75
100
125
150
200
225
300
Transformer
Type
STD
K-20
STD
K-20
STD
K-20
STD
K-20
STD
K-20
STD
K-20
STD
K-20
STD
K-20
STD
K-20
STD
STD
Dimensions (mm)
B
C
D
A
E
F
927
629
476
552
349
165
927
629
476
552
349
165
927
629
476
552
349
165
927
123
123
629
749
749
476
578
578
552
673
673
349
445
445
165
216
216
123
749
578
673
445
216
123
749
578
673
445
216
123
133
133
749
940
940
578
679
679
673
864
864
445
546
546
216
216
216
133
133
940
940
679
679
864
864
546
546
216
216
Heat
Weight Output
kg
kW
150
160
165
175
190
200
255
330
425
445
485
575
550
0.63
605
915
795
1220
860
1035
3.07
COMPUTER
ISOLATION
TRANSFORMER
A
0.83
1.10
1.60
D
2.27
C
2.58
3.12
Recomended
Conduit Location
Both Sides or
Bottom
3.79
4.02
5.81
F
E
4 Mounting
Slots: 15mm x 32mm
K-RATED TRANSFORMERS
YOU CAN TRUST THE LIEBERT NAME
Transformers are particularly vulnerable to overheating
because of the harmonic currents which are generated
by non-linear loads. For applications where high
harmonic loads could be a problem, computer isolation
transformers with a K-20 rating are available, as shown
in the table. These units are designed in accordance
with UL1561 to minimise the additional losses
associated with harmonic currents and to allow full
load operation with loads up to a 20 k-factor.
For a quarter of a century Liebert has been an industry
leader, renowned world-wide for our advanced computer
protection equipment, including air conditioning, UPS,
battery and security and environmental control systems.
Today we are one of the largest suppliers of equipment for
telecommunication and computer installations, clean
rooms, high security areas and many other critical
applications, with an impressive customer list which
includes thousands of companies, large and small,
all around the world.
We place a high priority on using the most advanced
technology, designed and built to the stringent ISO9000
standard, and we continue to invest heavily in research and
development.
All our systems are built to make the most efficient use of
energy and to have the highest level of reliability. And all our
products are backed by the international resources of the
Liebert Corporation, the name you can trust.
GENERAL SPECIFICATIONS
Capacities: 15, 20, 30, 50, 75, 100, 125, 150, 200, 225 and 300kVA.
Nominal Input Voltages: 208, 240, 480, 600V 60Hz • 380, 415V 50Hz.
Nominal Output Voltages: 208/120, 480/277V 60Hz • 208/120, 380/220,
415/240V 50Hz.
Cabinet: NEMA type 1 enclosure.
Transformer: Double shielded copper isolation transformer with input and
output surge suppression network.
Insulation: Class H 220°C insulation, 150°C maximum rise.
System Efficiency: 95-98%
Noise/transient suppression: Common mode - 140dB • Normal mode 90dB. Meets ANSI/IEEC C 62.41. CAT.A&B.
Audible noise: <45 - 55dBA at 1.5m.
Impedance: 4 - 5.5%.
Taps: Six full capacity primary taps at 2.5% (+5%, -10%)
Operating temperature: 0°C to 40°C ambient.
Cooling: Convection cooling, 305mm clearance front and rear.
UL listed: Meets UL1561 standard for safety.
While every precaution has been taken to ensure accuracy and completeness in this
brochure, Liebert Corporation assumes no responsibility, and disclaims all liability for
damages resulting from use of this information or for any errors or omissions.
© 1997 Liebert Corporation. All rights reserved throughout the world.
Specifications subject to change without notice.
All names referred to are trademarks or registered trademarks of their respective owners.
SLE IT E.1 (6/97)
Printed in UK
L I E B E R T C O R P O R AT I O N
1050 DEARBORN DRIVE
P.O. BOX 29186
COLUMBUS, OHIO 43229
USA
TEL: +1 614 888 0246
FAX: +1 614 841 6022
LIEBERT WEB SITE
http://www.liebert.com
GLOBE PARK
MARLOW
BUCKINGHAMSHIRE SL7 1YG
UNITED KINGDOM
TEL: +44 (0) 1628 403200
FAX: +44 (0) 1628 403294