China Outdoor SF6 Gas Insulated Circuit Breaker

Introduction:

Rockwill live tank outdoor SF6 circuit breaker is used to open and close rated current, fault current or conversion line to realize the protection, control and operation of power system, and can also carry out three-phase fast automatic reclosing operation.

The circuit breaker has advanced design and simple structure. The three poles are separated on a beam, which is fixed on two supports installed on the ground. Spring operating mechanism is installed in the lower part of the middle of the beam, through the connecting rod, arm and other transmission parts for three-pole linkage opening and closing operation. Each pole is composed of an arc extinguishing chamber, a supporting insulator and a crank box.

Rockwill outdoor SF6 circuit breaker, because of its compact structure, small volume and light weight, can be combined with the isolation plug to form a small SF6 circuit breaker. It can be used in indoor or outdoor substations.

According to national and IEC standards, the product has been proved to have excellent breaking capacity, reliable insulation, strong current capacity, long electrical and mechanical life and other characteristics through all type tests.

Features:

1. Excellent breaking performance

Adopt self-energy arc extinguishing chamber, can suit all terminal short circuit, break near area fault, out of step, dissimilar phase grounding fault and line charging current, etc., electric wear is small, arc voltage is low, can continuously break rated short circuit current 20 times.

2. Reliable insulation, strong flow capacity

SF6 gas insulation performance is superior, the insulation structure is simple and reliable. Fewer current-carrying contact parts, fewer contact points, strong flow capacity.

3. Unique structure design

The arc extinguishing chamber has simple structure, few parts, light weight, small operation power, high mechanical reliability and mechanical life of 6000 times. The upper and lower terminal boards are symmetrical on both sides, which can meet different wiring modes. The insulation structure of the product is optimized to greatly reduce the amount of SF6, which is conducive to environmental protection. Reasonable structure design, strong earthquake resistance.

4. Easy to install, maintain and repair

Factory overall debugging, site quick installation, with integrated spring mechanism operation, no oil leakage and air leakage, no daily energy storage monitoring requirements, so convenient maintenance.

Service environment:

• Ambient temperature: -40 ℃ ~ +50 ℃.
• Daily average ambient air relative humidity ≤ 95%, on average ≤ 90%;
• Wind pressure: less than 700pa.
• Altitude: less than 3000m.
• Earthquake intensity: not more than 9 degrees.
• Air Contamination: Ⅲ grade.

Principle:

LW Series self-interrupter chamber of sulfur hexafluoride circuit breaker uses advanced self-interrupter principle, when the fault current, the arc own energy use within the pressure cylinder gas pressure increases, when the current zero crossing of the formation of a strong bidirectional blowing gas to the upstream region of the discharge port to extinguish the arc, the circuit breaker breaking successful, thus reducing operating power mechanism.

Way of the current flowing through the system:

Static contact with a wiring board seat → Static finger →Main contacts→ Pressure cylinder → Moving finger → With moving contacts seat wiring board. (Closing position)

Opening operation: When the circuit breaker closed, issue of gate signal shunt opening release releases, opening spring through the shaft and crank arm, thereby pulling the insulation and the overall pressure cylinder rod assembly downward, when the static finger and main contacts separate and static and dynamic arc contact arcing contact is no separation, current is still moving along a stationary arcing contact arcing contacts and mobility. When the dynamic and static arc arcing when the contacts separate, the energy produced by arc burning the gas pressure inside the cylinder pressure increases, the nozzle throat from stationary arcing contacts and current zero after pressure from the high pressure gas cylinders nozzle throat and larynx bidirectional moving arcing contact spray, extinguishing the arc.

Closing operation: When the circuit breaker is in the open state, issued a closing signal closing release tripping spring actuator shaft and the crank arm, so as to promote the entire voltage insulated rod and cylinder assembly upward movement to close brake status, while giving opening spring energy storage, the motor starts to make the closing spring, ready for the next opening operation or reclosing operation.

Sealing system uses dynamic sealing and static sealing in two forms. Single dual static seal with O-ring seals for the use of rotating seals and use "X"-ring, during exercise reduces wear and leakage probability.