Siemens 3EQ User Manual

3EQ Composite Housed

Surge Arresters

Saving Money and Space, Gaining Reliability

Power Transmission and Distribution

A perfect Combination of Cost-Savings, Safety and Reliability

3EQ Surge Arresters:

Your Reliable, Sturdy and Economic Choice

3EQ surge arresters are virtually indestructible. While their tube design provides the highest possible mechanical strength and enables them to support high bending moments, the silicone rubber insulation is ideal for outdoor applications in severe environmental conditions. No matter how tough the environmental or operating conditions may be, our 3EQ arresters assures a 100 % reliable pressure relief performance, they provide the ultimate in protection. They are break-proof and retain at least 75 % of their mechanical strength even after pressure relief. They provide the greatest stability, even in earthquakes.

Reduced Space Requirements

Their advantages are more than convincing, a perfect combination of cost-savings and safety for your substations. The combination of silicone rubber and fiber-glass-reinforced tube imparts enormous load carrying capacity to the structure. Thus, our 3EQ surge arresters are the perfect choice to replace existing post insulators in your substations up to voltages of 800 kV. Where space is most essential, 3EQ surge arresters can even be mounted over the transformer to support connectors without any danger to neighboring equipment. This assures maximum

stability, even if the arresters should “blow out” after overloading. Pressure relief is absolutely reliable – there is no danger to equipments in the direct vicinity. Due to their unique tube design, no parts will be expelled, and the emerging arc will burn between the ends of the pressure relief device.

Longevity and Reliability

The 3EQ’s Silicone Rubber housings provide the best possible long-life-performance for high-voltage surge arresters. They make use of all the advantages of bonding vulcanized-on silicone rubber sheds to a fiberglass-reinforced plastic tube, providing enhanced safety and meeting every requirement. And, with their silicone rubber housings, the arresters enjoy all-round protection. The silicone rubber shield provides a reliable defense against snow, sandstorms, ozone, high-level UV radiation, sea salt, soot and acid rain in industrial regions. Only genuine silicone rubber is capable of maintaining its hydrophobic properties throughout its entire service life – and is resistant to UV radiation. The silicone rubber of the 3EQ surge arresters reliably prevents the formation of films of water or dirt. Surface currents resulting from conductive layers of accumulated dirt are eliminated.

The cost-saving solution for your substation

You require fewer post insulators for your installation, thereby saving you both money and space.

Transformer		Voltage	GIS bushing
		transformer
Surge	Support	Support
arreser
		Street

Saved installment space

Transformer

3EQ as support

Voltage

transformer

Support

Street

GIS bushing

Diagram of substation prior to 3EQ modification

Diagram of substation with integrated 3EQ modification

A lot more speaks for the efficiency of 3EQ

Their dramatically reduced weight means savings right from the start – in transportation, in support structures and in installation. The weight reduction in our polymeric arresters compared with porcelain types is amazing.

In fact, highvoltage arresters with composite housings are about 50 % lighter than their porcelain counterparts. This makes all the difference: Initially in terms of transportation costs. Then there is installation and commissioning – involving reduced labor costs, less complex support structures and simple hoisting gear. The cranes required can be significantly smaller – and the cost using them correspondingly lower. And there‘s another way in which they save costs – polymeric arresters don‘t need cleaning. By virtue of its hydrophobic properties, everything is so much simpler with silicone rubber throughout its entire service life. They provide numerous advantages – a gain for everyone, thanks to Siemens know-how for innovations and unsurpassed quality of manufacture.

Reduce the required space even more

It‘s no problem to install our 3EQ surge arrester on top of the transformer! There is no danger to equipment, even in the direct vicinity.

3EQ as support

Voltage

transformer

GIS bushing

Transformer

Street

Clearance between equipment according to technical standards

All 3EQ advantages at a glance are

Maximized service life

100 % break-proof – reliable overload performance, no hazardous splinters even under maximum pressure: these arresters can even be installed in close proximity to costly system components

Safe from damage – unbreakable during transportation, installation, storms, earthquakes and immune to vandalism

Outstanding stability in earthquake and storm:

these arresters can be used to replace post insulators

Use of silicone rubber – hydrophobic, resistant to pollution and to UV radiation

Extremely rugged – reliable in any climate and polluted environment

Substantially reduced weight – ease of installation with simple lifting gear

Complete and wide product range, special versions to order

Cost-effective in all respects – maximum availability – for many special application and installation needs

Sealing system

Directional pressure relief device

Nitrogen

FRP rods

Metal oxide blocks

Glass fibre reinforced tube

Silicone

rubber housing

Choose the Appropriate Arrester

In just four steps you can choose the right surge arrester:

1.First step choose the type 3EQ1, 3EQ4 or 3EQ3 from diagram 1.

2.Second step verify the maximum technical data with table 1.

3.Third step choose the surge arrester with table 2.

4.Fourth step select the suitable installation and grounding and complete the order number with table 3.

Table 2

Diagram 1

LD-class

Long duration current impulse Max. value/A

Bending Moment/kNm

5000 72

	4125
5	42
	42
	2750
	2100	Special										3EQ3
	2100	application										3EQ3
	38
	38
	1600	Special
	21	Special									3EQ4
	21	application

3 and 4	1200
3 and 4	1200
	6
2 and 3	6	Special							3EQ1
2 and 3	850	Special							3EQ1
2	500	application												Um
		application


	12	36	52	72	123	145	170	245	300	362	420	550	800
	12	36	52	72	123	145	170	245	300	362	420	550	800	kV

	Highest voltage		Standard	Rated	Continuous	Line	Long		Maximum values of the residual voltages at								Arrester type
	for equipment		lightning	voltage	operating	discharge	duration		discharge currents of the following impulses
			impulse		voltage	class	current
			withstand				2 ms
			voltage
								8/20 µs 8/20 µs			8/20 µs	30/60 µs	30/60 µs 30/60 µs
	Um		BIL min	Ur	Uc	LD-Cl	[A]	5 kA		10 kA	20 kA	0.5 kA	1 kA	2 kA
	[kV]		[kV]	[kV]	[kV]	LD-Cl	[A]	[kV]		[kV]	[kV]	[kV]	[kV]	[kV]
72.5				54	43	2	500	133		143	160	110	114	120	3EQ1	054	–	1	P	B	2	1	–
72.5			325	54	43	2	500	133		143	160	110	114	120	3EQ1	054	–	1	P	B	2	1	–
			325	54	43	3	850	122		130	144	104	106	111	3EQ1	054	–	2	P	B	3	1	–
			325	60	48	2	500	148		159	178	122	127	134	3EQ1	055	–	1	P	B	2	1	–
			325	60	48	2	850	130		138	153	110	113	119	3EQ1	056	–	2	P	B	2	1	–

			325	60	48	3	850	135		144	160	115	118	124	3EQ1	060	–	2	P	B	3	1	–
			325	66	53	2	500	163		175	196	135	140	147	3EQ1	066	–	1	P	B	2	1	–
			325	66	53	2	850	143		152	168	121	124	131	3EQ1	066	–	2	P	B	2	1	–
			325	66	53	3	850	149		158	176	127	130	136	3EQ1	066	–	2	P	B	3	1	–

			325	72	58	2	500	177		191	214	147	153	160	3EQ1	072	–	1	P	B	2	1	–
			325	72	58	3	850	162		173	192	138	142	149	3EQ1	072	–	2	P	B	3	1	–
	Neutral-ground arresters
	Um [kV]
72.5			325	30	24	2	500	74.0		79.5	89.0	61.2	63.6	66.8	3EQ1	030	–	1	S	B	2	1	–
72.5			325	30	24	3	850	67.7		72.0	79.9	57.6	59.0	61.9	3EQ1	030	–	2	S	B	3	1	–
			325	30	24	3	850	67.7		72.0	79.9	57.6	59.0	61.9	3EQ1	030	–	2	S	B	3	1	–
123														214	3EQ1		–		P	J			–
123			450	96	77	2	500	237		254	285	196	204	214	3EQ1	096	–	1	P	J	2	1	–
			450	96	77	2	850	208		221	245	177	181	190	3EQ1	096	–	2	P	J	2	1	–
			450	96	77	3	850	217		230	256	184	189	198	3EQ1	096	–	2	P	J	3	1	–
			450	102	82	2	500	251		270	303	208	216	227	3EQ1	102	–	1	P	J	2	1	–

			450	102	82	3	850	230		245	272	196	201	211	3EQ1	102	–	2	P	J	3	1	–
			450	108	86	2	500	266		286	321	220	229	240	3EQ1	108	–	1	P	J	2	1	–
			450	108	86	3	850	244		259	288	207	213	223	3EQ1	108	–	2	P	P	3	1	–
			450	111	89	3	850	250		266	296	213	218	229	3EQ1	111	–	2	P	P	3	1	–

	Neutral-ground arresters
	Um [kV]													114	3EQ1		–		S	B			–
123			450	51	41	2	500	126		135	151	104	108	114	3EQ1	051	–	1	S	B	2	1	–
	Resonant earthed		550	90	72	2	850	195		207	230	166	170	178	3EQ1	090	–	2	S	E	2	1	–
			550	96	77	2	850	208		221	245	177	181	190	3EQ1	096	–	2	S	J	2	1	–
145														247	3EQ1		–		P	J			–
145			550	111	89	2	500	274		294	329	227	235	247	3EQ1	111	–	1	P	J	2	1	–
			550	111	89	2	850	240		255	283	204	209	220	3EQ1	111	–	2	P	J	2	1	–
			550	120	96	2	500	296		318	356	245	254	267	3EQ1	120	–	1	P	P	2	1	–
			550	120	96	3	850	271		288	320	230	236	248	3EQ1	120	–	2	P	P	3	1	–

			550	126	101	3	850	284		302	336	242	248	260	3EQ1	126	–	2	P	P	3	1	–
			550	132	106	3	850	298		317	352	253	260	272	3EQ1	132	–	2	P	P	3	1	–
			550	144	115	2	850	311		331	368	265	272	285	3EQ1	144	–	2	P	P	2	1	–
			550	144	115	3	850	325		346	384	276	283	297	3EQ1	144	–	2	P	P	3	1	–
	Neutral-ground arresters
	Um [kV]
	145	550		60	48	2	500	148		159	178	122	127	134	3EQ1	060	–	1	S	B	2	1	–
170			650	138	110	2	500	340		366	410	282	293	307	3EQ1	138	–	1	P	P	2	1	–
170			650	138	110	2	500	340		366	410	282	293	307	3EQ1	138	–	1	P	P	2	1	–
			650	138	110	2	850	298		317	352	254	260	273	3EQ1	138	–	2	P	P	2	1	–
			650	138	110	3	850	311		331	368	265	272	285	3EQ1	138	–	2	P	P	3	1	–
			650	144	115	2	500	355		382	427	294	305	321	3EQ1	144	–	1	P	P	2	1	–

			650	144	115	3	850	325		346	384	276	283	297	3EQ1	144	–	2	P	P	3	1	–
			650	144	115	3	850	325		346	384	276	283	297	3EQ1	144	–	2	P	P	3	1	–
			650	150	120	3	850	338		360	400	288	295	310	3EQ1	150	–	2	P	P	3	1	–
	Neutral-ground arresters
	Um [kV]													154	3EQ1		–		S	B			–
	Um [kV]
4	170		650	69	55	2	500	170		183	205	141	146			069		1			2	1
4			1) According to IEC 60099-4 these values are measured on individual housing units

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