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The circuit-breakers feature ap- and cost-effectiveness and serve them proved technology and ensures efficient throughout the world. No matter what operation. More than 50, 3AP-circuit-breakers have been delivered to over coun- tries around the world in all climatic areas, proving on a daily basis the value and the reliability of the 3AP high-volt- age switchgear. Particularly strong porcelain insulators and a circuit-breaker design optimized by using the latest mathemati- cal techniques, give it very high seismic stability whilst in operation enabling it to perform to its full potential during its entire service life.
We carry out regular management reviews, internal audits in every department and the con- tinuous development and maintenance of documentation for all processes. The high quality, as well as excellent operating experience, is inherited by the 3AP series. This not only increases reliability and decreases operating costs as a result of long maintenance intervals, but also has a positive impact on the environment, in- dicating our sense of responsibility. Our switchgear will fulfill your demands for low life-cycle-costs with highest avail- ability and economical and continuous operation.
We use strong materials under low mechanical loads in the construction of individual switchgear components, therefore maintenance is not needed for 25 years or 10, operating cycles. By standardizing our internal processes and systematically implementing module strategies for our 3AP product series, we can offer minimal delivery times. The results are low service and invest- ment costs which provide our custom- ers competitive advantages worldwide, which equates to greater success for their own businesses.
The Modular Design The self compression arc-quenching The stored-energy spring mechanism principle is applied in our 3AP circuit- The compact design of this operating breakers. Our circuit-breakers, are identical to the ones circuit-breakers for the voltage range in our 3AP deadtank circuit-breaker fami- This results in nism.
One interrupter unit per pole. Two interrupter units per pole. Stored-energy spring mechanism, three-pole breaker with Stored-energy spring mechanism, circuit-breaker seperate breaker base for one or three-pole operation with separate breaker base for one or three-pole operation 3AP circuit-breakers are available in different designs 1 Interrupter unit 2 Post insulator 3 Pillar 4 Control cabinet 5 Operating mechanism cubicle 6 Grading capacitor 4 7 Closing resistor optional.
The Quenching 6 5 2 Principle Closed position The conducting path Opening: main contact in open position The current conducting path of the inter- Opening: arcing contact in open position rupter unit consists of the contact carrier 1 , the base 6 and the moveable con- tact cylinder 5.
In the closed position, the current flows via the main contact 2 and the contact cylinder 5. Breaking operating currents During the opening operation, the main contact 2 opens first, and the current commutates to the still closed arcing contact.
During the further course of opening the arcing contact 3 opens and an arc is drawn between the contacts. At the same time, the contact cylinder 5 moves into the base 6 and compresses the SF6 gas located there. This gas com- pression creates a gas flow through the contact cylinder 5 and the nozzle 4 to the arcing contact extinguishing the arc. Breaking fault currents In the event of interrupting high short- circuit breaking current, the SF6 gas is heated up considerably at the arcing contact due to the energy of the arc.
This leads to a pressure increase in the contact cylinder. During the further course of opening this increased pressure initiale a gas flow through the nozzle 4 extin- guishing the arc. In this case, the arc en- ergy is used to interrupt the fault circuit breaking current. This energy needs not to be provided by the operating mechanism.
This results in a reduced number of mechanical parts in the interrupter unit. The Stored-Energy Spring Mechanism The advantages of the stored-energy spring mechanism: Same principle for rated voltages from Since the closing and open- 5 11 ing springs are housed in the operating 12 mechanism, a compact and sturdy struc- 6 13 ture is achieved.
The use of roller bear- 16 ings and the maintenance-free spring mechanism are a prerequisite for decades 17 of reliable operation. Proven design prin- ciples such as vibration-isolated latches and load-free isolation of the charging mechanism are retained.
The Control Control cabinet with the stored- energy spring mechanism The control system includes all the sec- Compact variant protection. They are resistant to switch- ondary components required for oper- In addition to the basic variant, this vari- ing vibrations, and meet the require- ating the circuit-breaker, most of them ant includes: ments for electromagnetic compatibility are located in the control cabinet.
The control, tripping, motor and heat- Spring monitoring by motor run time ing power supplies are, to a great monitoring The circuit-breaker documentation in- extend, selectable. Depending on cludes the wiring diagram of the control customer requirements, two standard Heating monitoring current configuration. This diagram comprises control variants are available.
In addi- Overvoltage attenuation Connection diagram tion to the elementary actuation func- Motor circuit-breaker tions, it includes: Heating circuit-breaker The circuit diagram documentation is bi- lingual in one common customer specific 19 auxiliary switch contacts Special features language and in German.
Every control configuration Local actuator of a circuit-breaker can therefore be designed individually. All control com- ponents have been type-tested for use on our circuit-breakers and are all located in a weatherproof cubicle IP 55 degree of 7. Switching Testing laboratories performance, high-voltage stability and Our Berlin circuit-breaker plant has the performance under mechanical loads most modern testing laboratories and of- wind and short circuits and during an fers all required facilities: earthquake are simulated and optimized in the outline design phase using compu- Physics laboratory ter-aided calculations.
High-voltage testing laboratory Switching performance testing The use of common parts and assembled laboratory units in a large number of breaker types Mechanical testing laboratory such as live-tank, dead-tank, as well as in Temperature rise testing laboratory the GIS means the production of a large number of the same type of main com- The testing laboratories are certified by ponents.
Steady and regular quantities of the German accreditation body produced units allow a continuous pro- Technik e. With the society for electri- quality standards. This results laboratories are part of the European net- in a higher achieved validity. Routine testing Routine testing is performed in accord- The main components of the circuit- ance with the IEC- or ANSI-standards and breakers are subjected to complete it includes at least the following opera- pre-acceptance testing before assembly.
Each Switching time determination circuit-breaker is completely assembled in Release and motor currents the test bay.
The product specific inputs Gas monitoring for computer-assisted routine testing are Testing of control circuits in imported automatically from the order accordance with the circuit diagram processing tools.
This ensures that in Voltage drop of the main addition to the standard test procedure conducting path the fulfillment of every customer require- High voltage tests ment is checked before delivery. Installation — Simply Easy Installation and commissioning The 3AP circuit breakers can be installed The first visual inspection of the circuit- The circuit-breaker is dismantled into few by a single installation fitter.
Trans- and the first maintenance is recom- portation costs are minimized by using a No special tools are required. The subassemblies can be quickly assem- Throughout the entire service life of bled into a complete circuit-breaker on the circuit-breaker we provide installa- A worldwide 24 hours service is availa- site.
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Published by , Stored-energy spring mechanism, three-pole breaker with Stored-energy spring mechanism, circuit-breaker seperate breaker base for one or three-pole operation with separate breaker base for one or three-pole operation 3AP circuit-breakers are available in different designs 1 Interrupter unit 2 Post insulator 3 Pillar 4 Control cabinet 5 Operating mechanism cubicle 6 Grading capacitor 4 7 Closing resistor optional The Quenching 6 5 2 Principle Closed position The conducting path Opening: main contact in open position The current conducting path of the inter- Opening: arcing contact in open position rupter unit consists of the contact carrier 1 , the base 6 and the moveable con- tact cylinder 5.
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