hpa brochure

8/8/2019 Hpa Brochure

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ABB Switchgear

HPASF6-circuitbreaker

HPA is a medium-voltage circuit breaker

using SF6 gas as the insulation and break-

ing medium. Its design is compact and

space-saving.

The breaker is also available in a ver-sion with synchronised making for maxi-

mum damping of transients for different

applications.


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The HPA circuit breaker

HPA is a medium-voltage circuit breaker

using SF6

gas as the insulation and

breaking medium. Its design is compactand space-saving.

The HPA breaker works extremely

smoothly, which means that no dange-

rous overvoltages arise through current

cut-off or restriking. It is therefore very

suitable for the majority of operating

situations, including the breaking of motor

loads and capacitors.

The breaker is also available in a ver-sion with synchronised making for maxi-

mum damping of transients when switch-

ing in parallel capacitor banks.

The excellent electrical and mechanical

lifetime of the HPA breaker means that it

requires only a minimum of maintenance.


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The breaking pole in

different positions.

The HPA breaker works according to the

puffer principle, implying that when

breaking, the gas is compressed between afixed plunger and a moving cylinder and

then blown on to the arc between the fixed

and moving arc contacts (see figure).

When the breaker is closed, the current

flows via the main contacts and the cylinder.

When a tripping impulse is given, the

cylinder moves downwards, whereupon the

upper main contact opens and the current

commutes over to the arc contact. At thesame time, the gas in the cylinder is com-

pressed. When the nozzle has left the arc

contact, the compressed gas is blown along

the arc and cools it. The breaking process is

completed as the current passes through

zero.

Breaking principle

Closed position Breaking Open position

Main

contactMovingcylinder

Arccontact

Fixedplunger

Nozzle


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Breaking gasSF6 (sulphurhexafluoride) gas possesses a

unique combination of properties that

makes it extremely suitable for use in

circuit breakers. This has been confirmed

by service experience from more than

25,000 HPA breakers installed throughout

the world.SF6 gas has an insulation strength some

three times higher than that of air at an

overpressure of 2 bar, which is even

higher than that of transformer oil.

The casing for the breaking poles is made

of cast epoxy resin. The poles are

thoroughly

vacuum-dried

after assembly

and then sub-

jected to

pressure and

sealing tests. The

low gas pressure

(2.5 bar over-

pressure) and the

small volume (12

dm 3) mean that the

breaking poles

casing can under no circumstances dis-

integrate due to negligence, for instance

if it should be dropped during transport.

The worst that can happen is that the

casing cracks and the gas p ressure d rops.

To further increase their reliability, the

breaking poles can be provided with

temperature-compensating transducers

that provide an alarm at the lowest gas

pressure permissible upon breaking of full

short-circuit current.

However, the safety margins are so

large that the poles can cope with

breaking of rated current even without

overpressure.

Exploded HPA breaking

pole.

SF6 gas properties High insulation strength

Excellent ability to quench arcs

Chemically stable

Non-toxic

Non-flammable

Model of SF6 molecule.

Breaking poles


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HPA breaker with

operating device and

breaking pole dis-

assembled.

Operating device

The HPA breaker is provided with a

simple and dependable operating device

based on well established principles in

combination with many years of service

experience.

The maintenance-free bearings and the

ease of dismantling and removing

breaking poles and operating devices are

examples of valuable properties that

reduce maintenance costs.

The HPA breaker is operated by a

spring-loaded operating device that is

normally tensioned by an electric motor. It

can also be tensioned manually.

The tripping spring is automatically

tensioned when the breaker is switched

on. After each make operation, the motor

starts and tensions the making spring.

A breaker that is switched on can then

perform an Off-On-Off operation withouthaving to tension the making spring in

between, which means that the breaker

can also be used for fast reconnection (a

further On-Off operation can be made

with a normal time lag).

The breaker has making and tripping

coils for electric operation and can also be

supplied with pushbuttons for manual

operation. There is space for an under-

voltage release or a further tripping coil.

A counter for the number of operationsand indicators for tensioned/ untensioned

making spring and open/closed breaker

are included as standard.

The operating device is easily accessible

in the breakers rack and can be easily

dismantled and replaced.

The HPA breakers

operating device.


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Lifetime

Principal dimensions for HPA

The HPA breaker requires a minimum of

maintenance. The gas and the breaking

poles do not need to be replaced and burn-

off of contacts and nozzle due to the arcs is

insignificant. The breaking poles therefore

have a very long lifetime. The high electrical

lifetime is achieved through short breaking

times. For example, the poles cope with 160

breaks at 10 kA without maintenance of the

contacts.

The graph on the left shows the

contact lifetime expressed in the

number of possible breaks at various

short-circuit currents. The fact that

the main contacts are never affected

by the arcs is also of great significan-

ce for the long lifetime.

In the unlikely event of the break-

ing pole requiring repair, this has to

take place at the factory since vacuum

drying and pressure and sealing tests

have to be carried out. The breaking pole

can then be replaced by a spare pole that

can be easily mounted on site.

10 000

1000

100

10

10 20 30 40 kA

Electrical endurance of

the HPA circuit breaker.Number of interruptions

Short-circuit current

3.6 - 12 kV: 622 mm, 15 - 30 kV: 747 mm3.6 - 12 kV: 617 mm, 15 - 30 kV: 717 mm

Phase distance

185 or 210 mm

90mm

367mm

640mm

4.5mm

139mm


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Type testing has been carried out in accord-

ance with IEC 56 and ANSI c37.09.

The short-circuit tests were performed at

ABBs laboratory in Sweden, at KEMA in

Holland, at IREQ in Canada and at Powertest

in the U.S.A.

A certificate and test report can be

obtained upon request.

Data according to ANSI c37.09

Max. voltage kV 15 26 30

K factor ....................................................................................................................................................................1.3....................................... 1.0......................................1.0

Frequency..............................................................................................................Hz...........................................60 ..........................................60 .......................................60Rated holding voltage with alternating voltage testing......kV...........................................36 ..........................................50 .......................................60

Rated holding voltage with surge testing .....................................kV...........................................95.......................................125 ....................................150

Rated current .........................................................................................................A .................1200 3000.................1200 3000 ..............1200 3000

Making capacity................................................................................................kA...........................................58 ..........................................37 .......................................41

Short-circuit current ......................................................................................kA...........................................28 ..........................................18 .......................................20

Operating cycle.....................................................................................................................O 0.3 s CO/P 15 s CO 1 h CO

Breaking time ........................................................................................periods ..............................................5 .............................................5 ..........................................5

Max. breaking capacity symmetrical ...............................................kA...........................................36 ..........................................18 .......................................20

Short-time current, 3 sec. ........................................................................kA...........................................36 ..........................................18 .......................................20

Data according to IEC 56

Rated voltage kV 3.6 12 17 24 36

Rated frequency ...............................................................................................Hz............................50...........................50..............................50 ................................50

Rated power frequency withstand voltage .................................kV............................28...........................38..............................50 ................................70

Rated lightning impulse withstand voltage ..................................kV............................75...........................95 ..........................125 .............................170

Rated current .........................................................................................................A ..................3150................ 2500................... 2500 ..................... 1250

Rated (peak) making current ...................................................kA peak ........................100 .......................100..............................79 ................................63

Short circuit breaking current with operating cycle:

O 0.3 s CO 3 min CO.................................................................kA............................40...........................40.........................31.5 ................................25

O 3min CO 3 min CO ...............................................................kA............................50.......................... ........................... ..............................

Opening time......................................................................................................ms............................38...........................38..............................38 ................................38

Opening time for 12 kV 50 kA..............................................................ms............................70.......................... ........................... .............................

Arcing time, max. ............................................................................................ms............................15...........................15..............................15 ................................15

Breaking time .....................................................................................................ms............................53...........................53..............................53 ................................53

Breaking time for 12 kV 50 kA .............................................................ms............................85.......................... ........................... .............................

Making time, max...........................................................................................ms............................75...........................75..............................75 ................................75

Short-time current .........................................................................................kA............................50...........................40.........................31.5 ................................25

Principal data for HPA


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12

Broschyr1VEB580901-914.

Edition2b,

98-0

8.

Production:Roos&CoVsters.

StenbyOffset.2000ex.

ABB Switchgear ABMedium Voltage Division

Box 1023

S-732 27 Arboga, Sweden

Telephone: +46 589 851 00

Telefax: +46 589 852 90

E-mail: [email protected]

We reserve the right to alter design, dimensions andtechnical data without prior notice.

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