Abb Switchgear Manual On Hpa

1. Abb Switchgear Manual Download
2. Abb Switchgear Manual 12th Edition

English - 0,50MB Title: Service - Retrofitting - Solutions for ABB HPA-VRC Summary: Solutions for HPA circuit breaker and VRC contactor in Safesix and UniSafe enclosures Content: short- circuit current kA HD4- HPA/CW 12 1250 Up to 25 HD4- HPA/CW 36 1250 Up to 25 HD4- HPA gas retrofit of conventional HPA HD4- HPA Synchro gas retrofit of HPA SafeSynch VD4- HPA vacuum retrofit of conventional HPA VSC- HPA vacuum contactor retrofit of Categories: IEC SF6 Mechanical Circuit Breaker HPA, Service, Extension, Upgrades and Retrofits, Service, Medium. English - 1,81MB Title: Service - Retrofitting - Solutions for ABB SF6 gas HPA circuit breaker Summary: HD4- HPA retrofit solutions for HPA circuit breaker in Safesix enclosure Content: supplement contains the information necessary for HD4- HPA medium voltage circuit breakers, designed for Safesix switchgears. The HD4- HPA circuit breakers are mechanical interchangeable with HPA series circuit breakers and guarantee the same performances Categories: IEC SF6 Mechanical Circuit Breaker HPA, Service, Extension, Upgrades and Retrofits, Service, Medium.

English, Italian - 0,86MB Title: HD4- HPA - Istruzioni per l'esercizio e l'installazione / Installation and service instructions Content: the checks indicated in the following table:!! Interruttori estraibili HD4- HPA per contenitori SafeSix HD4- HPA withdrawable circuit-breakers for SafeSix enclosures HD4- HPA TN 490911 Per For SafeSix Ur 12 kV Ir 630.2000 A Isc 16.40 kA 7.5. Dimensioni Categories: IEC SF6 Mechanical Circuit Breaker HPA, Medium Voltage Products and Systems, Circuit Breakers.

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.

Abb Switchgear Manual Download

Abb Switchgear Manual 12th Edition

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.