The spring operating mechanism is a key component in high-voltage circuit breakers, responsible for storing and releasing mechanical energy to perform the closing and opening actions. The system typically consists of two independent springs: the closing spring and the tripping (or opening) spring. While the closing spring is usually energized through an energy storage mechanism, the tripping spring generally relies on the motion of the closing action to store its energy. This means that the circuit breaker can only be closed if the closing spring has been properly charged.
In the closing circuit, a switch energy storage contact is placed in series, ensuring that the circuit breaker cannot close unless the closing spring is fully charged. However, the tripping circuit does not include such a contact, allowing the circuit breaker to trip even when the closing spring is not energized. It's important to note that "not stored" here refers specifically to the closing spring not having stored energy, while the tripping spring may or may not have energy depending on the system’s state.
When the circuit breaker is open, the tripping spring is not yet charged, but the closing spring is. Upon closing, the closing spring releases its energy, simultaneously charging the tripping spring. This ensures that the circuit breaker can be opened again once it is closed. After the closing action, the motor begins recharging the closing spring, which typically takes about ten seconds. During this time, the tripping spring remains charged, so the circuit breaker can still trip quickly even if there is a fault.
If a fault occurs during the closing process, the circuit breaker can trip immediately because the tripping spring is already charged. However, after tripping, it cannot reclose right away—this is different from automatic reclosing. The closing spring must first be recharged before the circuit breaker can be closed again. If the circuit breaker was originally closed, both springs are already charged. In case of a fault, the tripping spring releases energy to open the circuit. After about one second, the closing spring then releases its stored energy to reclose the breaker. At this point, the tripping spring is recharged, but the closing spring is not.
If the circuit breaker fails to close due to a lack of energy, it can still be tripped immediately because the tripping spring is already charged. However, it will not be able to close again until the closing spring is fully recharged. In most cases, this process takes around 30 seconds, though in real-world scenarios, operators may need to wait for the fault to be resolved before attempting to reclose.
**CT19B Spring Operating Mechanism**
The CT19B spring operating mechanism is designed to operate ZN28 type indoor high-voltage vacuum circuit breakers installed in various 10kV fixed cabinets and other similar high-voltage breakers. It features over-current and voltage-loss trip protection, with a service life of up to 2000 operations. Its compact design, with a width reduced to 300 mm, improves stability and makes it ideal for retrofitting into older cabinets without oil. The mechanism outputs a working angle of 50° to 55°, making it versatile for different applications.
**Main Technical Parameters:**
1. The energy storage motor uses a single-phase permanent magnet DC motor. If AC power is required, full-wave rectification is applied, and the current is supplied via a bridge stack.
2. The closing electromagnet is a solenoid-type device.
3. The output shaft has a working angle of 50 to 55 degrees.
**CT17-35 Spring Operating Mechanism**
The CT17-35 spring operating mechanism is suitable for 40.5kV vacuum and SF6 circuit breakers requiring equivalent closing force. It meets the standards set by GB1984 “AC High Voltage Circuit Breaker†and the technical specifications of the product. The mechanism allows both electric and manual energy storage for the closing spring, with closing and tripping operations performed via electromagnet or manual knob. It supports reclosing and includes a free-trip function. The manual version provides manual energy storage, manual operation, and over-current protection, while the electric version offers electric tripping and over-current protection.
**Structural Features:**
The mechanism employs a split structure, with the energy storage motor, driving components, closing cam, input shaft, and output shaft arranged between the left and right side plates. This layout ensures balanced force distribution and improved stability. The closing spring and travel switch are positioned outside the side plates for easier maintenance and replacement. The split gate electromagnet is easily removable, and the energy storage status, combined indicators, and counter are located on the front panel for easy monitoring. Rolling bearings at both ends of the main shaft ensure smooth rotation and efficient power transmission. The mechanism is mounted using M12 screws through pre-drilled holes on the side plates, and the output shaft is located at the rear, allowing flexible installation and orientation. With a compact design, reliable performance, and a mechanical life of up to 10,000 operations, it is a durable and efficient solution for modern electrical systems.
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