The spring operating mechanism functions based on two separate springs: the closing spring and the tripping spring. These components operate independently, with the energy storage system typically only charging the closing spring. The tripping spring, on the other hand, is usually charged during the closing action of the circuit breaker. In the closing circuit, a switch energy storage contact is included in series, meaning that the circuit breaker cannot be closed unless the closing spring has been fully charged. However, the tripping circuit does not have such a contact, allowing the circuit breaker to trip even if the energy is not stored.
When the circuit breaker is open, the tripping spring is not yet charged, while the closing spring is fully energized. Upon closing, the closing spring releases its energy, simultaneously charging the tripping spring to ensure the breaker can be opened again. After the closing operation, the motor starts recharging the closing spring, which usually takes about ten seconds. During this time, the tripping spring remains charged, allowing for immediate tripping even in case of a fault.
This means that when a fault occurs during manual operation, the circuit breaker can trip immediately. However, it cannot reclose right away—this is different from automatic reclosing. The breaker must wait until the closing spring is fully charged before it can be closed again. If the circuit breaker is already closed, both the closing and tripping springs are charged. In the event of a fault, the tripping spring will release its energy to open the breaker. About one second later, the closing spring will then release its energy to close the breaker again. At this point, the tripping spring will be charged once more, but the closing spring will need to be recharged.
If the circuit breaker fails, it can still trip immediately because the tripping spring is already charged. However, after tripping, it cannot be closed again instantly. It must wait until the closing spring has completed its energy storage process. Typically, this takes around 30 seconds, though in real-world scenarios, it may require waiting for the fault to be resolved before attempting to reclose.
**CT19B Spring Operating Mechanism**
The CT19B spring operating mechanism is designed to work with ZN28 type indoor high-voltage vacuum circuit breakers in various 10kV fixed cabinets and similar high-voltage breakers. It includes overcurrent and voltage-loss trip protection, with a mechanical life of up to 2000 operations. Its compact design, with a width of just 300 mm, improves stability and makes it ideal for retrofitting older cabinets without oil. The output angle of the mechanism ranges between 50° and 55°, making it highly versatile.
**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 through a bridge stack.
2. The closing electromagnet is a solenoid type, ensuring reliable and fast operation.
3. The working output shaft has an angle range of 50° to 55°, suitable for a variety of applications.
**CT17-35 Spring Operating Mechanism**
The CT17-35 spring operating mechanism is used for 40.5kV vacuum and SF6 circuit breakers with equivalent closing force. It meets the technical standards outlined in GB1984 "AC High Voltage Circuit Breaker" and the product's specific requirements. The mechanism supports both electric and manual energy storage for the closing spring, and allows for both electromagnetic and manual operation for closing and tripping. It features a reclosing function and a free-trip capability. The manual version includes manual energy storage, manual operation, and overcurrent protection, while the electric version offers electric tripping and overcurrent protection as well.
**Structural Features:**
The mechanism uses a split structure, with the energy storage motor, driving parts, closing cam, input and output shafts arranged between the left and right side plates. This ensures balanced force distribution and enhanced stability. The closing spring and travel switch are located outside the side plates for easy maintenance. The tripping electromagnet is easily removable, and the energy storage status, combined indicators, and counter are clearly visible on the front panel. 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 positioned at the rear, allowing flexible installation and orientation. It is compact, lightweight, and reliable, with a mechanical life of up to 10,000 operations.
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