Disconnectors and earthing switches

For applications from 72.5 kV to 420 kV

a company of  Rauscher & Stoecklin SERW ZREW Tesar

2
Table of Contents
SERW 4

Quality through R&D 5

HV AIS Substation Design 6

Horizontal disconnectors 7

Pantograph disconnectors 14

Vertical disconnectors 19

Earthing switches 23

Motor drives 29

Motor drive mounting options 33

Services 34

SERW as a company of R&S 35

3
SERW
Your partner for reliable disconnectors
Modern power transmission in high-voltage networks must meet the highest
reliability standards to ensure a continuous power supply.

Our wealth of experience in manufacturing high-voltage dis- methods, highly-qualified personnel as well as an integrated
connectors and earthing switches ensures we can support management system all guarantee our ongoing success.
our customers as a competent and reliable partner. All of our
switchgear is precisely tailored to meet customer require- The right product for every application
ments, while taking a wide range of criteria into considera- Our portfolio of high-voltage switches includes disconnec-
tion. tors and earthing switches for nominal voltages ranging from
72.5 kV up to 420 kV. Our high-quality and reliable products
As an expert partner, we support our customers at every are available in several different models:
step of the process – from planning and supply of the switch-
gear to installation and commissioning, as well as after-sales • Horizontal
services. • Pantograph
• Vertical
The name SERW stands for reliability and quality in the mar-
ket. Modern production processes and lean manufacturing

Modern and durable switches are our speciality

4
Quality through R&D
R&D as the key to success
We focus on your requests to find a harmonious solution.

Our quality were able to become one of Europe's market-leading manu-

At SERW, we strongly believe that, as pioneers of new facturers, setting new standards along the way that are now
technologies, we can offer our customers innovative and universally established.
high-quality products which meet the respective require-
ments of diverse projects. All of our products incorporate Our innovations
state-of-the-art technologies on the basis of the highest qua- The large number of innovations contained in our products
lity standards. provides the basis for their high quality, extraordinarily long
service life and high efficiency.
Focus on R&D
SERW places a strong emphasis on R&D, which is deeply an-
chored in our organization. Many years of experience cou-
pled with intensive collaboration with utility companies have
helped us develop our products so that they meet – and of-
ten exceed – the requirements. This was the only way we

High-voltage switches installed in a substation

5
HV AIS Substation Design
Single Line Diagram
Disconnector switches are used in air insulated substations terminals. Thus, disconnectors provide a visual seperation of
to provide isolation of powered equipment from the net- two different networks.
work. Disconnectors are suitable for switching small currents The sketch below illustrates how disconnectors are used in a
or where no significant change in voltage occurs across the 420kV substation, for example.

SERW busbar disconnectors

Power transformer
(e.g. from the R&S Group)

Current transformer

Voltage transformer

SERW outgoing disconnectors

with earthing switches

SERW disconnectors of auxi-

liary busbars with earthing
switches

Illustration of an open-air 420kV substation using disconnectors and earthing switches

6
Horizontal disconnectors
72.5 kV - 420 kV
Features

• Stable opening and closing thanks to a technologically • High reliability even under the most challenging environ-
sophisticated design mental conditions
• Maintenance-free contact system • Straightforward coupling of the drives with the disconnec-
• Mounted on a durable steel frame with a long service life tors and earthing switches
• High mechanical resistance against seismic or electrody- • High corrosion protection
namic forces

Three-pin, horizontal disconnector 123 kV at a substation in Hofheim

7
 SERW Horizontal disconnectors

72.5 kV – 145 kV type 3SHT

up to 4000 A, 63 kA/160 kA
Technical data

Rated voltage 72.5 kV 123 kV 145 kV

Rated current Up to 4000 A

Rated short-circuit current Up to 63 kA (1s)

Rated peak withstand current Up to 160 kA

Power frequency withstand voltage AC Hz, 1 min – against ground 140 kV 230 kV 275 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 160 kV 265 kV 315 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 325 kV 550 kV 650 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 375 kV 630 kV 750 kV

Horizontal disconnector 123 kV

8
SERW Horizontal disconnectors

72.5 kV – 145 kV type 3SHT

up to 4000 A, 63 kA/160 kA
Side-by-side-installation

Dimensions

A B D G F K M

Ur = 72.5kV 940 1400 770 1345 1300 3630 400

Ur = 123 kV 1400 2000 1215 1789/1820 1760 4860 550

Ur = 145 kV 1700 2300 1500 2030 2060 5460 550

9
 SERW Horizontal disconnectors

72.5 kV – 145 kV type 3SHT

up to 4000 A, 63 kA/160 kA
Installation with one behind the other

Dimensions

A C D G F K M

Ur = 72.5 kV 940 1900 770 1345 1300 3580 400

Ur = 123 kV 1400 2800 1215 1789/1820 1760 7740 550

Ur = 145 kV 1700 3400 1500 2030 2100 9240 550

10
SERW Horizontal disconnectors

245 kV type 1SHJ

up to 3150 A, 50 kA/125 kA

Dimensions

Ir, A D E F G
2000 A, 3150 A 2600 2300 1300 3000 2860

Technical data

Rated voltage 245 kV

Rated current Up to 3150 A

Rated short-circuit current Up to 50 kA (1s)

Rated peak withstand current Up to 125 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 460 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 530 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 1050 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 1200 kV

11
 SERW Horizontal disconnectors

420 kV type 1SHJ

up to 3150 A, 50 kA/125 kA

Dimensions

A D E F G

Ir, 4200 4000 2320 4800 4730

2000 A, 31500 A 4200 3650 2120 4800 4380

4200 3350 1960 4800 4080

Technical data

Rated voltage 420 kV

Rated current Up to 3150 A

Rated short-circuit current Up to 50 kA (1s)

Rated peak withstand current Up to 125 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 520 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 610 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 1425 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 1425 (+240) kV

12
SERW Horizontal disconnectors

420 kV type 3SHJ

up to 4000 A, 63 kA/160 kA

Dimensions

Isolator A D E F G

Ir, Up = 1550 kV 4200 3350 2060 4800 4240

4000 A Up = 1675 kV 4200 3650 2220 4800 4540

Up = 1800 kV 4200 4000 2420 4800 4890

Technical data

Rated voltage 420 kV

Rated current Up to 4000 A

Rated short-circuit current Up to 63 kA (1s)

Rated peak withstand current Up to 160 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 520 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 610 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 1425 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 1425 (+240) kV

13
Pantograph disconnectors
123 kV - 420 kV
Features

• Stable opening and closing thanks to a technologically • High reliability even under the most challenging environ-
sophisticated design mental conditions
• Maintenance-free contact system • Straightforward coupling of the drives with the disconnec-
• Reduced space requirement (diagonal arrangement) tors and earthing switches
• Mounted on a durable steel frame with a long service • High corrosion protection
life
• High mechanical resistance against seismic or electrody-
namic forces

Pantograph Disconnector 123 kV

14
SERW Pantograph disconnectors

123 kV type 1SPJ

up to 3150 A, 50 kA/125 kA

Dimensions

Isolator D G E S R
Ur = 123 kV
Up = 550 kV 1220 1420 1750 2250 3400

Technical data

Rated voltage 123 kV

Rated current Up to 3150 A

Rated short-circuit current Up to 50 kA (1s)

Rated peak withstand current Up to 125 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 230 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 265 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 550 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 630 kV

15
 SERW Pantograph disconnectors

245 kV type 1SPJ

up to 3150 A, 50 kA/125 kA

Dimensions

Isolator D G E S R
Ur = 245 kV
Up = 1050 kV 2300 2500 2700 3700 5750

Technical data

Rated voltage 245 kV

Rated current Up to 3150 A

Rated short-circuit current Up to 50 kA (1s)

Rated peak withstand current Up to 125 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 460 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 530 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 1050 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 1200 kV

16
SERW Pantograph disconnectors

420 kV type 1SPJ

up to 3150 A, 50 kA/125 kA

Dimensions

Isolator D G E S R

Up = 1550 kV 3350 3550 4100 4850 8100

Ur = 420 kV
Up = 1675 kV 3650 3850 4100 5150 8400

Up = 1800 kV 4000 4200 4100 5500 8750

Technical data

Rated voltage 420 kV

Rated current Up to 3150 A

Rated short-circuit current Up to 50 kA (1s)

Rated peak withstand current Up to 125 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 520 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 610 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 1425 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 1425 (+240) kV

17
 SERW Pantograph disconnectors

420 kV type 3SPJ

up to 4000 A, 63 kA/160 kA

Dimensions

Isolator D G S R

Up = 1550 kV 3350 3700 4690 8450

Ur = 420 kV
Up = 1675 kV 3650 4000 4990 8750

Up = 1800 kV 4000 4350 5340 9100

Technical data

Rated voltage 420 kV

Rated current Up to 4000 A

Rated short-circuit current Up to 63 kA (1s)

Rated peak withstand current Up to 160 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 520 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 610 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 1425 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 1425 (+240) kV

18
Vertical disconnectors
123 kV - 420 kV
Features

• Stable opening and closing thanks to a technologically • High reliability even under the most challenging environ-
sophisticated design mental conditions
• Maintenance-free contact system • Straightforward coupling of the drives with the disconnec-
• Mounted on a durable steel frame with a long service tors and earthing switches
life • High corrosion protection
• High mechanical resistance against seismic or electrody-
namic forces

Vertical Disconnector 123 kV

19
 SERW Vertical disconnectors

123 kV type 1SST

up to 3150 A, 50 kA/125 kA

Dimensions

A B D G F E K M
Ur = 123 kV
1400 1600 1220 1520 1760 820 3775 840

Technical data

Rated voltage 123 kV

Rated current Up to 3150 A

Rated short-circuit current Up to 50 kA (1s)

Rated peak withstand current Up to 125 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 230 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 265 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 550 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 630 kV

20
SERW Vertical disconnectors

420 kV type 1SSJ

up to 3150 A, 50 kA/125 kA

Dimensions

Isolator A D R F G

Up = 1550 kV 4200 3350 6050 4200 3500

Ur = 420 kV
Up = 1675 kV 4200 3650 6350 4200 3850

Up = 1800 kV 4200 4000 6700 4200 4200

Technical data

Rated voltage 420 kV

Rated current Up to 3150 A

Rated short-circuit current Up to 50 kA (1s)

Rated peak withstand current Up to 125 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 520 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 610 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 1425 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 1425 (+240) kV

21
 SERW Vertical disconnectors

420 kV type 3SSJ

up to 4000 A, 63 kA/160 kA

Dimensions

Isolator A D F G R

Up = 1550 kV 4200 3350 4200 3735 6130

Ur = 420 kV
Up = 1675 kV 4200 3650 4200 4035 6430

Up = 1800 kV 4200 4000 4200 4385 6780

Technical data

Rated voltage 420 kV

Rated current Up to 4000 A

Rated short-circuit current Up to 63 kA (1s)

Rated peak withstand current Up to 160 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 520 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 610 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 1425 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 1425 (+240) kV

22
Earthing switches
72.5 kV - 420 kV
Features

• Mounted on a durable steel frame with a long service • Single and three-pin design possible
life • Straightforward coupling of the drives with disconnectors
• High mechanical resistance against seismic or electrody- and earthing switches
namic forces • High corrosion protection
• High reliability even under the most challenging environ-
mental conditions

Earthing switches 123 kV

23
 SERW Earthing switches

123 kV type 1SUT

up to 3150 A, 50 kA/150 kA
Side-by-side-installation

Dimensions

B D G E
Ur = 123 kV
1600 1220 1240 1040

Technical data

Rated voltage 123 kV

Rated current Up to 3150 A

Rated short-circuit current Up to 50 kA (1s)

Rated peak withstand current Up to 125 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 230 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 265 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 550 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 630 kV

24
SERW Earthing switches

123 kV type 1SUT

up to 3150 A, 50 kA/150 kA
Installation with one behind the other

Dimensions

B D G E
Ur = 123 kV
2900 1220 1240 1040

Technical data

Rated voltage 123 kV

Rated current Up to 3150 A

Rated short-circuit current Up to 50 kA (1s)

Rated peak withstand current Up to 125 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 230 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 265 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 550 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 630 kV

25
 SERW Earthing switches

245 kV type 1SUJ

up to 3150 A, 50 kA/125 kA

Dimensions

D G E
Ur = 245 kV
2650 2840 1400

Technical data

Rated voltage 245 kV

Rated current Up to 3150 A

Rated short-circuit current Up to 50 kA (1s)

Rated peak withstand current Up to 125 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 460 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 530 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 1050 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 1200 kV

26
SERW Earthing switches

420 kV type 1SUJ

up to 3150 A, 50 kA/125 kA

Dimensions

D G E
Ur = 420 kV
3650 3940 2300

Technical data

Rated voltage 420 kV

Rated current Up to 3150 A

Rated short-circuit current Up to 50 kA (1s)

Rated peak withstand current Up to 125 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 520 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 610 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 1425 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 1425 (+240) kV

27
 SERW Earthing switches

420 kV type 3SUJ

up to 4000 A, 63 kA/160 kA

Dimensions

D G E
Ur = 420 kV
3650 4090 2300

Technical data

Rated voltage 420 kV

Rated current Up to 4000 A

Rated short-circuit current Up to 63 kA (1s)

Rated peak withstand current Up to 160 kA

Power frequency withstand voltage AC 50 Hz, 1 min – against ground 520 kV

Power frequency withstand voltage AC 50 Hz, 1 min – across isolating distance 610 kV

Rated lightning impulse withstand voltage 1.2/50 µs – against ground 1425 kV

Rated lightning impulse withstand voltage 1.2/50 µs – across isolating distance 1425 (+240) kV

28
Motor drives
for a reliable operation
Features

• Control voltage variants: 230 VAC, 220 VDC, • Easy to access connection terminal strips
110 VDC, 60 VDC • Anti-corrosion heating
• Motor voltage variants: 400 VAC, 230 VAC, • On/off/isolating layer signaling
110 VDC, 220 VDC • Lead signal
• High corrosion protection thanks to stainless steel • For using different disconnector-
• Local, remote and manual control types

Motordrive PMA2, PMA3, PMA5, PMA6 Motordrive PMR5, PMR6, PMR7

29
 SERW Motor drives

PMA2, PMA5 – Technical data

PMA2 PMA5

Rated control voltage 230 VAC, 220 VDC, 110 VDC

Rated motor voltage 3x230/ 400 V, 50 Hz 230 VAC, 220 VDC, 110 VDC

I max 5A 9A

Ir 2A 1.5 A

Thermal resistor power consumption 2x30 W/ 230 VAC

6 On, 6 Off, 2 Isolating layer

Auxiliary switch
12 On, 12 Off, 2 Isolating layer

Motor operation 5s

Maximum shaft torque 700 Nm 750 Nm

Motor 550 W 630 W

Housing protection class IP 54

Weight 63 kg

Dimensions HxWxD 670x440x404

Shaft Horizontal, 192°

Drive mounting On the support table

Gear type Worm gear

Diagram

30
SERW Motor drives

PMR5, PMR6 - Technical data

Rated control voltage 230 VAC, 220 VDC, 110 VDC, 60 VDC

Rated motor voltage 230 VAC

I max 10 A/ 20 A

Ir 2.3 A/ 3.9 A

Thermal resistor power consumption 2x30 W/ 230 VAC

Auxiliary switch 7 On, 7 Off, 2 Isolating layer

Motor operation 8s

Motor 1 f/ 630 W

Housing protection class IP 54

Weight 74 kg

Dimensions HxWxD 737x500x305

Shaft Vertical, 90°

Drive mounting On the frame/support table

Gear type Screw gear

Diagram

31
 SERW Motor drives

PMA3, PMA6 - Technical data

PMA3 PMA6

Rated control voltage 230 VAC, 220 VDC, 110 VDC

Rated motor voltage 3x230/ 400 V, 50 Hz 230 VAC, 220 VDC, 110 VDC

I max 6A 9A

Ir 2A 2A

Thermal resistor power consumption 1x30 W + 1x50 W 1x100 W

6 On, 6 Off, 2 Isolating layer

Auxiliary switch
12 On, 12 Off, 2 Isolating layer

Motor operation 8s

Maximum shaft torque 1300 Nm

Motor 550 W 630 W

Housing protection class IP 54

Weight 85 kg

Dimensions HxWxD 760x456x485

Shaft Horizontal, 192°

Drive mounting On the support table

Gear type Worm gear

Diagram

32
Motor drive mounting options

The drive can be mounted on the frame and support table. We can quickly and flexibly respond to your requests. To-
The design depends on the project and customer specifica- gether, we always find the right solution.
tion.

Drive on the frame

Drive on the support table

Example installation of the PMR5 drive with horizontal disconnector 123 kV

33
Services
Customized to your needs
Highly-motivated and superbly trained employees are the key to
ensuring high quality standards.

SERW offers comprehensive services for high-voltage swit- We tailor our services to meet our customers' needs. We will
chgear and supports installations throughout the entire pro- be happy to implement the service work for you directly in
duct lifecycle – from the installation through to inspection. your transformer station. We also train our customers' per-
sonnel so that they can independently perform the installati-
Our highly qualified employees at our factory have decades on and inspection work.
of experience in service and are renowned for their high-qua-
lity work.

Our comprehensive range of services

34
SERW as a company of R&S
An international group
The R&S companies are united by their common long-standing experience
and expertise in the production of power products, as well as their hunger for
progress.

Founded in 2012, the R&S Group is an international group This results in premium-quality products and the highest
headquartered in Sissach, Switzerland with branches all over possible degree of reliability for our customers.
the world.
Companies of R&S
The success of R&S is built on: • Rauscher  &  Stoecklin: Distribution transformers,
overhead line switches, high-current plug-in connectors,
• Long-standing experience of the associated companies in switchgears
their respective product sectors • SERW: High-voltage and medium-voltage switchgear
• A highly motivated and excellently trained workforce • ZREW: Power transformers
• Products based on proven technologies that go hand in • Tesar: Cast-resin, distribution transformers, measuring
hand with innovative and efficient manufacturing proces- transducers
ses

Our branches worldwide

35
Companies of the R&S Group

R&S International Holding Rauscher & Stoecklin

Reuslistrasse 32 Reuslistrasse 32
4450 Sissach 4450 Sissach
Switzerland Switzerland
info@the-rsgroup.com info@raustoc.ch
www.the-rsgroup.com www.raustoc.ch

SERW ZREW Transformers

Tymákovská 42, Sedlec ul. Rokicińska 144
332 02 Starý Plzenec 92-412 Łódź
Czech Republic Poland
serw@serw.cz transformatory@zrew-tr.pl
www.serw.cz www.zrew-transformatory.pl

Tesar Tesar Polska

Loc. Chiaveretto ul. Skarbowa 34
52010 Subbiano – Arezzo 32-005 Niepołomice
Italy Poland
info@tesar.eu info@tesarpolska.pl
www.tesar.eu www.tesarpolska.pl

SERW, spol. s r.o.

Version: 14052018

Tymákovská 42, Sedlec T +420 377 966 451 serw@serw.cz

CZ-332 02 Starý Plzenec F +420 377 966 621 www.serw.cz

a company of  Rauscher & Stoecklin SERW ZREW Tesar