Auto Recloser Circuit Breaker

• Used for protection of 36kV overhead lines.
• Capable of breaking current like circuit breakers;
• Nominal current (Ir ≤ 800A) and
• Short-circuit currents (Isc ≤ 16kA)
• There are current and voltage sensors inside the hydrophobic epoxy jacket.
• The control unit is equipped with a protection relay and monitoring devices.
• In the event of a temporary line failure, it can open and close up to four times with the O-0.5s-CO-2s-CO-2s-CO cycle, thus avoiding longer network outages .
• As they are outdoor units, they can be mounted on a concrete or steel construction pole.
• Proven suitable for use at -40°C and +55°C to provide long life with extensive testing in accordance with IEC 62271-11.

TECHNICAL CHARACTERISTICS:

Nominal voltage: 38 kV

Rated insulation level

Mains frequency withstand voltage, dry/wet: 70 kV, 1 min.

Lightning impulse voltage: 170 kVp, 1.2/50µs

Nominal frequency: 50 Hz

Rated current: 800A

Rated short-circuit breaking current: 16 kA

Sequence of operations: O-0.5s-CO-2s-CO-2s-CO

Current and rated short-circuit withstand time: 41.6 kAp, 3 seconds

First pole factor to cross: 1.5

Cut-off time: ≤ 50ms

Closing time: ≤ 60ms

Pole gap

In the aperture: ≤ 5 ms

Closing: ≤ 5 ms

Electrical rigidity: 10,000 on-off at rated current

Mechanical resistance: Class M2, no-load 10,000 cycles

Cable charging current: 40 A

Line load current: 5 A

Recloser circuit breakers are devices installed in overhead lines and transformer stations to avoid prolonged network outages. As circuit breakers, they interrupt continuous service and fault currents, and they can close up to four times. Reducing power outages for the customer and recovering entire parts of a medium voltage network increasingly requires high-speed structures for network communication.

The switching device and a control cabinet well suited to it, located at the operating level, offer a flexible solution for automatic protection and remote control systems, and fulfill the communication requirements of smart grids.

In the new family of reclosers, Siemens provides network protocols such as IEC 61850, IEC 60870-5-104 or DNP3 TCP. Fast communication between reclosers facilitates extremely fast data exchange. Thus, distribution networks can restore power quickly in the event of a network outage.