Call Us: 91-44-24838221
Mail: Marketing@photonn.in
Call Us: 91-44-24838221
Mail: Marketing@photonn.in
3AP1 circuit-breakers up to 300 kV are equipped with one interrupter unit per pole, and 3AP2 circuit-breakers up to 550 kV include two interrupter units. For applications from 362 kV to 550 kV, the circuit-breakers can be equipped with optional closing resistors (3AP3). The 3AP4 includes four interrupter units per pole and can also be delivered with closing resistors on request (3AP5). Moreover, the Siemens high-voltage live-tank circuit-breakers are available for three-pole operation with a common base (FG) (fig. 9), for single-pole operation with a common base (FE), or for single-pole operation with separate bases (FI).
Siemens high-voltage circuit-breakers operate safely, and are capable of withstanding high mechanical loads. Particu- larly strong porcelain insulators and a circuit-breaker design optimized by using the latest mathematical techniques give them very high seismic stability while in operation, enabling them to perform to their full potential during the entire service life of up to 50 years (table 1). The uncomplicated design of the circuit-breakers and the use of many similar components ensure high reliability. The experience Siemens has gained from the many circuit-breakers in service has been applied to improving the design. The self-compression interrupter unit, for example, has proven its reliability in more than 100,000 installations all over the world.
3 AP1 FG 145 KV
Live-tank circuit-breakers for air-insulated switchgear The interrupter unit in live-tank circuit-breakers is not earthed during operation; it is exposed to high-voltage potential. These circuit-breakers are therefore called live tanks.
The live-tank circuit-breaker family is available for rated voltages from 72.5 kV up to 800 kV.
They consist of the following main components based on a well-established platform concept:
Live-tank circuit-breakers with vacuum technology Following 40 years of experience producing medium-volt- age vacuum interrupters and more than three million delivered units, Siemens has now introduced this proven technology into high-voltage power networks.
The new member of the Siemens circuit-breaker family meets the same high quality standards as the SF6 portfolio for high performance and reliability throughout its long service life, and is also designed according to the well- established modular platform concept.
The new 3AV1 vacuum circuit-breaker has clear technical advantages: It features reliable switching capacity, requires no maintenance even when subjected to frequent breaking operations, and is also environmentally friendly – thanks to switching operations performed in a vacuum, with nitrogen as the insulating medium.
These circuit-breakers are the right choice for future proj- ects across a wide range of applications.
A complete set of type tests in accordance with the latest edition of IEC 62271-100 has proven the suitability of the 72.5 kV live-tank vacuum circuit-breaker.
Prototypes of the new Siemens high-voltage vacuum cir- cuit-breakers have already been installed in European power networks. A number of Energy customers are operat- ing the 3AV1 prototypes in their systems, and are sharing their operating and field experience with us. In fact, several thousand switching operations have already been per- formed successfully in the field and documented.
| Type | 3AP1 | 3AP2/3 | 3AP4/5 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Rated voltage [kV] | 72.5 | 123 | 145 | 170 | 245 | 300 | 420 | 550 | 800 |
| Number of interrupter units per pole | 1 | 2 | 4 | ||||||
| Rated short-duration power-frequency withstand voltage [kV] | 140 | 230 | 275 | 325 | 460 | 460 | 610 | 800 | 830 |
| Rated lightning impulse withstand voltage/min [kV] | 325 | 550 | 650 | 750 | 1,050 | 1,050 | 1,425 | 1,550 | 2,100 |
| Rated switching impulse withstand voltage [kV] | – | – | – | – | – | 850 | 1,050 | 1,175 | 1,425 |
| Rated normal current, up to [A] | 2,500 | 4,000 | 4,000 | 4,000 | 4,000 | 4,000 | 5,000 | 5,000 | 5,000 |
| Rated short-time withstand current (1 s – 3 s), up to [kA(ms)] | 31.5 | 40 | 40 | 40 | 50 | 40 | 63 | 63 | 63 |
| Rated short-circuit breaking current, up to [kA] | 31.5 | 40 | 40 | 40 | 50 | 40 | 80 | 63 | 63 |
| Temperature range [°C] | – 60 up to + 55* | ||||||||
| Rated operating sequence | 0-0.3 s-CO-3 min-CO or CO-15 s-CO | ||||||||
| Rated break time | 3 cycles | 2 cycles | |||||||
| Rated frequency [Hz] | 50/60 | ||||||||
| Maintenance after | 25 years | ||||||||
| Type | 3AV1 |
|---|---|
| Rated voltage [kV] | 72.5 |
| Number of interrupter units per pole | 1 |
| Rated normal current, up to [A] | 2,500 |
| Rated short-time withstand current, up to [kA] | 31.5 |
| Rated short-circuit breaking current, up to [kA] | 31.5 |
| Rated frequency [Hz] | 50 |
| Rated power-frequency withstand voltage [kV] | 140 |
| Rated lightning impulse withstand voltage [kV] | 325 |
| Rated duration of short circuit [s] | 3 |
| Rated peak withstand current (2.7 p.u.) [kA] | 85 |
| First-pole-to-clear-factor [p.u.] | 1.5/1.3 |
| Capacitive voltage factor [p.u.] | 1.4 |
| Temperature range [°C] | – 55 up to + 40 |
| Maintenance after | 25 years |
| Insulating medium | N2 |
