V I S H AY I N T E R T E C H N O L O G Y, I N C .
GRID RESISTORS
NGR
Reliable Neutral Grounding Resistors (NGR),
High-Current Grid Resistors
KEY BENEFITS
• Neutral ground resistors offer line-neutral voltage to 8 kV and operating
temperatures to +760 °C
• Tied live design ensures there are no floating voltages in the assembly
• Rugged, shock-resistant, IP23-rated enclosures available for environmental protection
• Lifting eyes allow safe and easy installation
• Stainless steel resistive elements
• High-thermal-capacity to absorb high currents
• Can be designed for specific applications
APPLICATIONS
• Industrial power systems
• Transformers
• Generators
RESOURCES
• Datasheet: NGR - www.vishay.com/doc?31873
• For technical questions contact vishaymilwaukeeresistor@vishay.com
• Material categorization: For definitions please see www.vishay.com/doc?99912
One of the World’s Largest Manufacturers of
Discrete Semiconductors and Passive Components
PRODUCT SHEET
1/2
VMN-PT0441-1412
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC
DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
FEATURES
• Tied live design
V I S H so
AYthat
I Nthere
T E Rare
T E no
C Hfloating
N O L O G Y, I N C .
voltages in the assembly
NGR
GRID RESISTORS
• Rugged shock resistant IP23 rated enclosures
available environmental protection
www.vishay.com
• Lifting eyes allow safe and easy
installation
Vishay
Milwaukee
NGR
• Stainless steel resistive elements
• High thermal capacity toy absorb high currents
DIMENSIONS
NGR
• Can be designed for specific applications
Reliable Neutral Grounding
Resistors,
• Custom design
on demand
www.vishay.com
of compliance
•
Material
categorization:
definitions Milwaukee
High-Current Grid
Resistors for Vishay
please see www.vishay.com/doc?99912
Reliable Neutral Grounding Resistors, High Current Grid Resistors
APPLICATIONS OF NEUTRAL GROUNDING (NEUTRAL
EARTHING)
FEATURES
C
Vishay Milwaukee offers a complete line of custom and standard •neutral
grounding
(NGRs),
Tied live
design resistors
so that there
arealso
no known
floatingas
neutral earthing resistors (NERs). Vishay Milwaukee devices are designed
to
absorb
a
large
amount
of
energy
without
voltages in the assembly
exceeding temperature limitations as defined in IEEE-32. These resistors are used for the grounding of generators and
• Rugged shock resistant IP23 rated enclosures
transformers in wye configurations for ground fault, overvoltage, and short circuit protection.
available environmental protection
• Lifting eyes allow safe and easy installation
CONTACT THE FACTORY FOR CUSTOM DESIGN AND OPTIONS FOR STANDARD DESIGNS
• Stainless steel resistive elements
Options include: current transformers, enclosure style and entrance location, enclosure stands, disconnects, bushings, etc.
• High thermal capacity toy absorb high currents
For custom designs please include:
system voltage, line-neutral voltage, max. on-time, current Brating.
A
• Can be designed for specific applications
Right side view
• Custom design on demand
Front view
STANDARD ELECTRICAL SPECIFICATIONS
Note
• Material categorization: for definitions of compliance
• See “Standard Product Ratings” table for product
specific dimensions
LINE-NEUTRAL
RESISTANCE
please see www.vishay.com/doc?99912
SYSTEM VOLTAGE
CURRENT
TOLERANCE
MODEL
VOLTAGE
VALUE
±%
(kV)
(A)
TECHNICAL SPECIFICATIONS
(kV)
PARAMETER
UNIT
RESISTOR CHARACTERISTICS
NGR1390
2.4
1.39 (NEUTRAL100
to 1000
1.39 to 13.9
10
APPLICATIONS
OF NEUTRAL
GROUNDING
EARTHING)
Resistance tolerance
%
10
NGR2400
4.16
2.4and standard neutral
100 to 1000
2.40 to (NGRs),
24.00
Vishay
Milwaukee offers a complete
line of custom
grounding resistors
also known10as
Operating temperature
°C
-55 to +760
neutral earthing resistors (NERs). Vishay Milwaukee devices are designed to absorb a large amount of energy without
NGR4160 working voltage 7.20
4.16
100 to 1000
to 41.60
10
Maximum
600 V to 15 kV4.16
(product
dependent)
exceeding temperature limitations as defined in IEEE-32. These resistors are used for the grounding of generators and
NGR7200 in wye configurations
12.47
7.2overvoltage, and
100
to 1000
7.2 to 72
10
transformers
for ground fault,
short
circuit protection.
MATERIAL SPECIFICATIONS
NGR7620
Resistive element
CONTACT THE
NGR8000
Element insulators
13.2
7.62
100 to 1000
13.8
8
100 to 1000
7.6 to 76
Stainless steel
8 to 80
Ceramic
10
FACTORY FOR CUSTOM DESIGN AND OPTIONS FOR STANDARD DESIGNS
10
Options include: current transformers, enclosure style and entrance location, enclosure stands, disconnects, bushings, etc.
Enclosure
Steel (stainless steel upon request)
Note
rating.
For
custom
designs
please include: system voltage, line-neutral voltage, max. on-time, current
High
voltage
insulation
Porclein rise of 760 °C.
• Per IEEE-32, standard NGRs are designed for a maximum on-time of 10 s and a maximum temperature
GLOBAL PART
NUMBER INFORMATION
STANDARD
ELECTRICAL
SPECIFICATIONS
CONTACT
INFORMATION
Global Part Numbering example: NGR8000K1000BZZZZZ (NGR-ZZZZZ 8000 V 1000 A 10 % B)
MODEL
N
G
R
Revision: 02-Oct-14
NGR1390
LINE-NEUTRAL
RESISTANCE
SYSTEM VOLTAGE
CURRENT
VOLTAGE
VALUE
For design assistance, contact:
vishaymilwaukeeresistor@vishay.com or +1-888-616-6666
(kV)
(A)
Z
8
0
0
0
K
1
0
0
0
B
Z
(kV)
2.4
1.39
100 to 1000
1.39 to 13.9
TOLERANCE
±Z
%
Z
Z
10
NGR2400
4.16
2.4
100 to 1000
2.40 to 24.00
10
MODEL
VALUE
TOLERANCE
SIZE
PACKAGING
SPECIAL
(3
digits)
(4 digits) 7.20
(1 digit)
(4 digit)
(1 digit)
(5 digits)
NGR4160
4.16
100 to 1000
4.16 to 41.60
10
NGR
1390 = 1390 V line-neutral
K = ± 10 %
0400 = 400 A
B = bulk
Allowable range 00000 to
NGR7200 2400 = 2400 V line-neutral
12.47
7.2
100 toA1000
to 72
10
1000 = 1000
D = wood 7.2
crated
ZZZZZ
4160 = 4160 V line-neutral
K = standard for all
R = international, heavy
alphanumeric
NGR7620
13.2
7.62
100 to 1000
7.6 to 76
10
7200 = 7200 V line-neutral
types and values
duty and plastic skids
7620
=
7620
V
line-neutral
Engineering
controlled
NGR8000
13.8
8
100 to 1000
8 to 80
10
8000 = 8000 V line-neutral
B = standard for all types internal
document
number
Revision: 02-Oct-14
Document
Number:
31873
1
and values
For technical questions, contact: vishaymilwaukeeresistor@vishay.com
Note
DOCUMENT
SUBJECT
TO CHANGE
WITHOUTon-time
NOTICE.
DESCRIBED
HEREIN
AND
• PerTHIS
IEEE-32,
standardISNGRs
are designed
for a maximum
ofTHE
10 s PRODUCTS
and a maximum
temperature
rise of
760THIS
°C. DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
CONTACT INFORMATION
For design assistance, contact: vishaymilwaukeeresistor@vishay.com or +1-888-616-6666
Revision: 02-Oct-14
Document Number: 31873
3
For technical questions, contact: vishaymilwaukeeresistor@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE.
PRODUCT SHEET
2/2 THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
VMN-PT0441-1412
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC
DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
Revision: 02-Oct-14
Document Number: 31873
1
For technical questions, contact: vishaymilwaukeeresistor@vishay.com