ABB Switchgear HPA SF 6. -circuit breaker. HPA is a medium-voltage circuit breaker using SF 6
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1 HPA SF 6 -circuit breaker HPA is a medium-voltage circuit breaker using SF 6 gas as the insulation and breaking medium. Its design is compact and space-saving. The breaker is also available in a version with synchronised making for maximum damping of transients for different applications. ABB Switchgear
2 The HPA circuit breaker HPA is a medium-voltage circuit breaker using SF 6 gas as the insulation and breaking medium. Its design is compact and space-saving. The HPA breaker works extremely smoothly, which means that no dangerous 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 version with synchronised making for maximum damping of transients when switching in parallel capacitor banks. The excellent electrical and mechanical lifetime of the HPA breaker means that it requires only a minimum of maintenance.
3 Breaking principle Main contact Moving cylinder Arc contact Nozzle Fixed plunger Closed position Breaking Open position The breaking pole in different positions. The HPA breaker works according to the puffer principle, implying that when breaking, the gas is compressed between a fixed 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 the same time, the gas in the cylinder is compressed. 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.
4 Breaking poles Exploded HPA breaking pole. The casing for the breaking poles is made of cast epoxy resin. The poles are thoroughly vacuum-dried after assembly and then subjected to pressure and sealing tests. The low gas pressure (2.5 bar overpressure) and the small volume (12 dm 3 ) mean that the breaking pole s casing can under no circumstances disintegrate 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 pressure drops. 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. Model of SF 6 molecule. Breaking gas SF 6 (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. SF 6 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. SF 6 gas properties High insulation strength Excellent ability to quench arcs Chemically stable Non-toxic Non-flammable
5 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 without having 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 undervoltage release or a further tripping coil. A counter for the number of operations and indicators for tensioned/untensioned making spring and open/closed breaker are included as standard. The operating device is easily accessible in the breaker s rack and can be easily dismantled and replaced. HPA breaker with operating device and breaking pole disassembled. The HPA breaker s operating device.
6 Lifetime Electrical endurance of the HPA circuit breaker. Number of interruptions ka Short-circuit current The HPA breaker requires a minimum of maintenance. The gas and the breaking poles do not need to be replaced and burnoff 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 significance for the long lifetime. In the unlikely event of the breaking 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. Principal dimensions for HPA 640 mm 4.5 mm 367 mm Phase distance 185 or 210 mm 139 mm 90 mm kv: 617 mm, kv: 717 mm kv: 622 mm, kv: 747 mm
7 Principal data for HPA Type testing has been carried out in accordance with IEC 56 and ANSI c The short-circuit tests were performed at ABB s 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 IEC 56 Rated voltage kv Rated frequency...hz Rated power frequency withstand voltage...kv Rated lightning impulse withstand voltage...kv Rated current...a Rated (peak) making current...ka peak Short circuit breaking current with operating cycle: O 0.3 s CO 3 min CO...kA O 3min CO 3 min CO... ka Opening time...ms Opening time for 12 kv 50 ka...ms Arcing time, max...ms Breaking time...ms Breaking time for 12 kv 50 ka...ms Making time, max...ms Short-time current...ka Data according to ANSI c37.09 Max. voltage kv K factor Frequency...Hz Rated holding voltage with alternating voltage testing...kv Rated holding voltage with surge testing...kv Rated current...a Making capacity...ka Short-circuit current...ka Operating cycle...o 0.3 s CO/P 15 s CO 1 h CO Breaking time...periods Max. breaking capacity symmetrical...ka Short-time current, 3 sec....ka
8 Broschyr 1 VEB Edition 2b, Production: Roos & Co Västerås. Stenby Offset ex. We reserve the right to alter design, dimensions and technical data without prior notice. ABB Switchgear AB Medium Voltage Division 12 Box 1023 S Arboga, Sweden Telephone: Telefax: medium.voltage@seswg.mail.abb.com
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