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Arrester Selection Guide


	Select an ANSI Arrester		Select an IEC Arrester

	Select Arrester Type		Select Arrester Type
	Select AC Rating (Rating/MCOV) Distribution Arrester Simple Table Interactive Guide (Excel) ArresterFacts on this Subject Station Arrester Simple Table Transmission Line Arrester		Select AC Rating (Ur/Uc) Class 1 Simple Table Interactive Guide (Excel) ArresterFacts on this Subject Class 2-5 Simple Table Transmission Line
	Check Margin of Protection		Check Margin of Protection
	Evaluate Energy Handling		Evaluate Energy Handling
	Evaluate Failure Mode		Evaluate Failure Mode
	Check Mounting and Environmental Constraints		Check Mounting and Environmental Constraints

This page is under development and modules will be added over the next several months.

April 13, 2009

Started Page

Added ANSI Section on AC Rating Distribution Arrester Selection

Simple Arrester Selection Table for ANSI Arresters

This table agrees with IEEE Standards and all Suppliers of Arresters

Typical ANSI System Voltages			Suggested ANSI Arrester MCOV Rating
Nom Line to Line Voltage	Max Line to Line Voltage	Max Line to Grnd Voltage	Solid Multi-grounded Systems ( 4 wire)	Uni-grounded Systems (3 wire)	Impedance grounded, Ungrounded and Delta Systems	Transmission Line Arresters for Lightning Protection Only
kV rms	kV rms	kV rms	MCOV	*MCOV []**	*MCOV []**
2.40	2.52	1.46			2.55
4.16	4.37	2.52	2.55	5.1	5.1
4.80	5.04	2.91			5.1
6.90	7.25	4.19			7.65
8.32	8.74	5.05	5.1	7.65
12.0	12.6	7.28	7.65	10.2
12.5	13.1	7.57	7.65	12.7 [7.65]
13.2	13.9	8.01	8.4	12.7 [8.4]
13.8	14.5	8.38	8.4	12.7 [8.4]	15.3 [8.4]	15.3
20.8	21.8	12.6	12.7	15.3 [12.7]		21
22.9	24.0	13.9	15.3	19.5 [15.3]		22-24
23.0	24.2	14.0	15.3-17		24.4 [15.3]	22-24
24.9	26.2	15.1	15.3	22 [15.3]		24-29
27.6	29.0	16.8	17	24.4 [17]		24-29
34.5	36.2	20.9	22	29 [22]	36-39 [22]	29-36
46.0	48.3	27.9		29	39	29-39
69.0	72.5	41.9		42-48	53-67	48-67
115.0	121	69.8		70-76	84-98	76-98
138.0	145	83.8		84-98	106-115	98-115
161.0	169	98		98-115	115-131	115-131
230.0	242	140		140-152	182-190	152-190
345.0	362	209		209-245	230-289	245-289
500.0	525	303		318-452		>452
765.0	800	462		462-490		>490

[gapped MOV]

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Simple Table for Arrester Selection for IEC Systems

This table agrees with IEC Standards and all Suppliers of Arresters

Typical IEC System Voltages			Suggested Uc for IEC Systems
Nominal Line to Line Voltage	Typical Max Line to Line Voltage	Max Line to Grnd Voltage	Solidly Earthed Neutral at the Source Transformer	Impedance Earthed, Isolated and Delta Systems	Transmission Line Arresters for Lightning Protection Only
kV rms	kV rms	kV rms	Uc	Uc
3.3	3.7	2.1	2.4	4.0
6.6	7.3	4.2	4.8	7.2
10.0	11.5	6.6	7.2	12
11.0	12.0	6.9	9.6	12	12
16.4	18.0	10.4	12	18	18
22.0	24.0	13.9	16.8-24	24	24
33.0	36.3	21.0	24-36	36	36
47.0	52	30.1	33-43	53	43-53
66.0	72	41.6	43-58	72	58-72
91.0	100	57.8	66-77	102	77-102
110	123	71.1	77-86	125	86-125
132	145	83.8	96-115	145	115-145
155	170	98.3	110-125	170	125-170
220	245	142	154-188	245	188-245
275	300	173	182-192	300	192-300
330	362	209	221-230	360	230-360
400	420	243	269-288	420	288-420
500	550	318	420-440	550	440-550

About this Guide

This Selection Guide is 100% neutral in its selection process. Even though there may be links to suppliers, there is no preference in the selection process.

If you see any potential improvements or errors, please let me know at Jonathan.Woodworth@ArresterWorks.com

Many Thanks for Using ArresterWorks.com for your source of Arrester and Surge Protection Knowledge.

Jonathan Woodworth

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