ANG Bulletin

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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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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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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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 [email protected].

6255 Halle Drive, Cleveland, OH, U.S.A. 44125

Phone: (216) 573-7600 FAX: (216) 573-5953

E-Mail: [email protected]

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

ANG Bulletin

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