- Product Introduction
3AHC-31.5 series railway electrification indoor single-pole vacuum circuit breaker made by Saitong Railway Electrification (Nanjing) Co., Ltd. and Jiangsu Changjiang Electric Co., Ltd. with SIEMENS advanced technology is intended for indoor installation air-insulated component. It is suitable for single-phase 50Hz railway electrification power supply system.
3AHC-31.5 series railway electrification indoor single-pole vacuum circuit breaker complies with the following specifications: GB1984, IEC60056, TB/T2803 and so on. On normal operation condition, it can work in traction power supply system safely and reliably.
3AHC-31.5 series railway electrification indoor single-pole vacuum circuit breaker has particular advantages when used in systems where the switching frequency in the operating current range is high and where a certain number of short-circuit breaking operates, and the VCB are prepared for auto-reclosing operations, and have exceptionally high operating reliability and long life.
3AHC-31.5 series railway electrification indoor single-pole vacuum circuit breaker is trolley type and is made up of trolley frame, operation mechanism of circuit breaker and main circuit. The main frame is assembled with different parts and this makes it many advantages such as simple structure, good appearance and reliable performance.
The whole operating mechanism of 3AHC-31.5 series railway electrification indoor single-phase circuit breaker is contained in a single housing, including the releases, auxiliary switches, indicators and actuating devices. The conveying system adopts unique gear driving unit, enabling reliable accuracy.
The main circuit of 3AHC-31.5 series railway electrification indoor single-pole circuit breaker is made up of vacuum interrupter and two high strength aluminum-alloy supports. They are fixed on mechanism box through two insulators and the aluminum supports connected by two outer struts.
1. Charging for spring energy storage
To provide the necessary motive energy, the stored energy spring mechanism is charged via gear, gear drive charging is reliable and accurate, it can either be charged automatically by a motor or by hand in a vertical pumping action with charging lever. The current charging condition is shown at charging condition indicator.
2. Closing procedure
The closing process is started by the mechanical ON push-button or by activation of closing solenoid. The release mechanism then permits drive shaft to be rotated by the (previosly) charged spring. The moving contact in vacuum interrupter is moved upwards by the insulated coupling rod until the contacts touch. In the further sequence of motion, spring arrangement is tensioned and the appropriate amount of contact force thus applied. During the closing process, opening springs are simultaneously charged.
3. Opening procedure
The opening procedure is started by mechanical OFF push-button or by activation of opening solenoid. The mechanism then permits drive shaft to be unlocked. The opening spring energy which is released moves the contact into the open position at a defined speed.
4. Auto reclosing procedure
OFF-ON-OFF auto reclosing sequence is activated and checked by the protection system. It is necessary for the spring in the mechanism to be in the charged condition, with the circuit-breaker in the closed position. The charging process is carried out automatically after closing of the breaker on breakers with motor charging mechanism, but must be carried out manually on breakers without charging motors (or when the charging motor has broken down). Opening of the breaker is also possible during the charging process, but subsequent closing of the breaker is however blocked until the charging process has been completed.
