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8/11/2019 ANG Bulletin
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KEY BENEFITS
Avtron Neutral Grounding Resistors
are designed to provide added safety to indus-
trial distribution systems by limiting ground
fault current to reasonable levels. In a typi-
cal solidly grounded four wire system, the
neutral is tied directly to earth ground. This
can cause high ground fault current (typically
10,000 to 20,000 amps) and excessive dam-
age to transformers, generators, motors, wiring,
and associated equipment. Inserting an Avtron
Neutral Grounding Resistor between neutra
and ground limits fault current to a safe level
(typically 25 to 400 amps) while still allowing
sufficient current flow to operate fault clearing
relays. Limiting fault current also reduces the
problem of transient overvoltages (up to six
times normal voltage) which can occur during
arcing type ground faults.
Neutral Grounding Resistor
The Avtron Advantage
Designed in strict accordancewith IEEE Standard 32-1972
Reliable, all stainless steelHelidyne resistor elements
Corrosion resistant aluminizedsteel enclosures
Elements are triple insulated
from ground for added safetyInternal bushings eliminate theneed for costly elevating stands
Fully factory assembled no field assembly required
UL Listed
American Made American Owne
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8/11/2019 ANG Bulletin
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Avtron Neutral Grounding Resistors are engi-neered with reliability, safety, and ease of installation as
top priorities. Resistor elements, terminals, support rods
and exterior fasteners are made from
stainless steel for added durability.
Enclosures are manufactured from
corrosion resistant aluminized steel
finished with ASA-61 gray powder
coat paint. Multi-lingual voltage warn-
ing signs are provided for increased
safety. Forged lifting eyes are
furnished for easy handling. Internal
connection points eliminate conven-
tional live external bushings andthe need for expensive elevating
stands or towers.
Avtron Neutral Grounding Transformersare similar in design to Avtron Neutral Grounding
Resistors and provide high resistance grounding
for medium voltage generators and transformers.
The standard package consists of a single-phase,
dry-type, Epoxycast transformer plus a second-
ary power resistor, mounted in a common enclosure.
The transformer is typically selected with a primary
voltage equal to or greater than the system voltage
to maintain a high insulation rating for added safety.The transformer secondary is rated at 240 volts and
factory wired to the resistor. The resistor is sized so
the fault current reflected through the transformer pro-
duces the desired fault current on the system neutral
(typically 2 to 12 amps for 60 seconds). A voltage relay
connected to the secondary resistor is used to detect
Neutral Grounding Transformers
Neutral Grounding Resistors(Type ANG)INDUSTRY LEADING DESIGNS
The following information is required when specifying
Avtron Neutral Grounding Resistors or Avtron Neutral
Grounding Transformers:
Grounding Transformer rated 4160
volts L-L, 2400 volts L-N, 10 amps,
60 seconds, with 15KVA 4160:240 P.T.
Grounding Resistor
rated 4160 volts L-L,
2400 volts L-N, 400
amps, 10 seconds.
System Voltage
Line-to-NeutralVoltage
Current Rating
Maximum Time On
Open or Enclosed
Current TransformerRatio (if applicable)
GroundingTransformer KVARating (if applicable)
Special Options
Grounding Resistor
rated 13800 volts L-L, 8000
volts L-N, 200 amps, 10 seconds.
the presence of a ground fault. If the fault persists
beyond a certain time period, the relay will send a sig-
nal to open the main circuit breaker.
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8/11/2019 ANG Bulletin
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AvtronCatalogNumber
SystemVoltage
Line-To-NeutralVoltage
InitialCurrentAmps
Ohms10%
LengthL
WidthW
HeightH
ApproxWeigh
10 Second Ratings (760C Temperature Rise)
ANG14-1
ANG14-2
ANG14-4
ANG14-6
ANG14-8
ANG14-10
ANG14-12
2400
2400
2400
2400
2400
2400
2400
1390
1390
1390
1390
1390
1390
1390
100
200
400
600
800
1000
1200
13.9
6.9
3.4
2.3
1.7
1.3
1.1
42
42
42
42
42
42
46
42
42
42
42
42
42
60
42
42
42
42
42
42
42
300
300
300
350
400
450
650
ANG24-1
ANG24-2
ANG24-4
ANG24-6
ANG24-8
ANG24-10
ANG24-12
4160
4160
4160
4160
4160
4160
4160
2400
2400
2400
2400
2400
2400
2400
100
200
400
600
800
1000
1200
24
12
6
4
3
2.4
2
42
42
42
42
42
42
46
42
42
42
42
42
42
60
42
42
42
42
42
42
76
300
300
350
400
500
550
700
ANG42-1
ANG42-2
ANG42-4
ANG42-6
ANG42-8
ANG42-10
ANG42-12
7200
7200
7200
7200
7200
7200
7200
4160
4160
4160
4160
4160
4160
4160
100
200
400
600
800
1000
1200
41.6
20.8
10.4
6.9
5.2
4.1
3.4
46
46
46
46
46
46
46
60
60
60
60
60
60
60
42
42
76
76
76
76
96
600
650
700
750
800
900
1200
ANG80-1
ANG80-2
ANG80-4
ANG80-6
ANG80-8
ANG80-10
ANG80-12
13800
13800
13800
13800
13800
13800
13800
8000
8000
8000
8000
8000
8000
8000
100
200
400
600
800
1000
1200
80
40
20
13.3
10
8
6.6
46
46
46
46
46
46
46
60
60
60
60
60
60
60
76
76
76
76
76
76
96
650
800
900
1000
1100
1200
1400
Extended Time Ratings (610C Temperature Rise)
ANG3-15E
ANG3-25E
480
480
277
277
15
25
18.4
11
30
30
20
20
31
31
50
75
ANG14-15E
ANG14-25E
ANG14-50E
2400
2400
2400
1390
1390
1390
15
25
50
92.6
55.6
27.8
42
42
42
42
42
42
42
42
42
300
350
400
ANG24-15E
ANG24-25E
ANG24-50E
4160
4160
4160
2400
2400
2400
15
25
50
160
96
48
42
46
46
42
60
60
42
76
76
350
800
900
ANG42-15E
ANG42-25E
ANG42-50E
7200
7200
7200
4160
4160
4160
15
25
50
277
166
83.2
42
46
46
60
60
60
76
76
96
800
900
1200
Continuous Time Ratings (385C Temperature Rise)ANG3-5C
ANG3-10C
ANG3-15C
480
480
480
277
277
277
5
10
15
55.4
27.7
18.4
30
30
30
20
20
20
15
15
31
50
75
100
NOTE: Other voltage, current, and time ratings available. Please consult facto
CERTIFIED PRODUCTS
Avtron Neutral GroundingResistors are designed, manu-factured, and tested in strict accor-
dance with IEEE Standard 32-1972and are UL listed and certified (up
to 1000 amps).
FLEXIBLE SOLUTIONS
Avtron Neutral GroundingResistors can be supplied withopen frame construction, for install-
ation inside switchgear or similar
enclosures, or fully assembled with
indoor/outdoor safety enclosures.
Options include:
Current Transformers
Potential Transformers
Disconnect Switches(oil or air insulated)
Aluminum or StainlessSteel Enclosures
Special Paint
Seismic Qualified Units High Altitude Ratings
(above 6000 feet)
Hazardous LocationRatings (Class 1,Group D, Division II)
Duty Cycle Max. Temp. Rise Typical Current
60 seconds or less 760C 100 to 2000 amps
Extended * 610C 15 / 25 / 50 amps
Continuous 385C 1 to 25 amps
*Defined as 10 minutes or greater, no more than 90 days total per year. Also referred to as Mining Du
American Made American Owne
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8/11/2019 ANG Bulletin
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A A
B B
42.00 [1067]
46.00 [1168]
GND
(1/2-13
HDW)
9.38
[238]
36.00 [916]
LIFTING EYE
(TYP 4 PLACES)
VOLTSLINE-TO-NEUTRAL
AMPS
OHMS
TIMEON
KVB.I.L.
D WG .N O. C AT .N O.
50/60 Hz
MADEINU.S.A. B25653
NEUTRALGROUNDI NG RESISTOR
MANUFACTURING,INC.
CLEVELAND, OHIO
42.00 [1067]
42.00
[1067]
46.00 [1168]2.62
[67]
40.00 [1016]
REMOVABLE PANEL
(FRONT & REAR)
NEUTRALGROUND
H2 H1
GROUND CONNECTION
DIRECT TO BUSHING
(1/2-13 STUD)
NEUTRAL CONNECTION
DIRECT TO C.T. H1 TERMINAL
(1/2-13 BOLT)
CURRENT
TRANSFORMER
All dimensions are in inches [millimeters].Specifications subject to change without notice.
Neutral Grounding Resistors(Type ANG)TYPICAL OUTLINE DRAWING
SUPERIOR SERVICE
For total supportin selecting the
right neutral grounding resistor or
industrial resistor product for your
application, contact your Avtron
sales engineer at (216) 573-7600
or resistors@avtron.com.
6255 Halle Drive, Cleveland, OH, U.S.A. 44125
Phone: (216) 573-7600 FAX: (216) 573-5953
E-Mail: resistors@avtron.com
www.avtronresistors.com
Helidyne is a trademark of Avtron LoadBank, Inc.Epoxycast is a trademark of AFP Transformers.
Avtron Grounding Resistor rated 4160
volts L-L, 2400 volts L-N, 600 amps,
10 seconds installed at customers site.
32.00
[813]
40.00
[1016]
.562 x 1.00 [14 x 25]
4 MOUNTING SLOTS
(FOR 1/2", M11, M12
ANCHOR BOLTS)
OPEN AREA AVAILABLE
FOR CABLE ENTRY & EXIT
6.00[152]
1.00 [25]
36.00 [914]
3.00 [76]
5.00 [127]
FRONT
1.00 [25]
VIEW "A-A"
40.00
[1016]
46.00
[1168]
40.00 [1016]46.00 [1168]
3.00 [76]
3.00 [76]LIFTING EYES
VIEW "B-B"
Bulletin 409 Rev. C
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