The measures to prevent the phenomenon of reverse power transmission in
Huaquan generator mainly include the following methods:
1. Adopting dual throw knife switch conversion: suitable for users with small electrical loads and low requirements for power supply reliability, such as small processing and breeding farms in rural areas. It should be noted that the double throw knife switch should be installed as much as possible at the main incoming line of the power grid to prevent reverse power transmission to the grid caused by users' unauthorized connections.
2. Adopting interlocking circuit breakers for conversion: suitable for users with large electrical loads and dedicated transformers. There are two ways to lock each other:
Using auxiliary contacts on the circuit breaker to achieve locking, ensuring that only one circuit breaker can be closed in any situation, ensuring the reliability and safety of the locking.
The use of PLC (Programmable Logic Controller) and auxiliary contacts of circuit breakers to achieve mutual interlocking and automatic conversion between mains power and self provided generators has been widely applied in industrial intelligent control with good results.
3. Use ATS automatic switching equipment for switching: ATS equipment adopts a system with two circuits, compact structure, small size, and has manual and automatic operation purposes. In automatic mode, when the mains power fails, it automatically switches to the generator side for power supply; When the power grid is restored, it automatically switches to the power supply side. Better ATS equipment also has the function of self starting and self stopping generators, suitable for occasions with high requirements for power supply reliability, such as hotels, restaurants, high-rise buildings, etc.
Definition and hazards of reverse power transmission:
Reverse power transmission refers to the situation where a backup generator sends electricity to the city grid. If the circuit breaker at the outlet of the diesel generator does not operate and the mains power is not stopped, the mains power supply and the self provided diesel generator power supply may not be synchronized, which may damage the unit and even cause oscillations in the mains network. In addition, reverse power transmission may also pose a threat to the safety of maintenance personnel in the power supply department.
Management measures:
1. Strengthen management: Increase the management of self owned diesel generators to make users fully aware of the serious harm of reverse power transmission.
2. Unauthorized introduction of power sources or connection of backup power sources to the grid is strictly prohibited: users are strictly prohibited from making unauthorized connections.
3. Train electrical operators: familiarize them with the switching operation procedures of diesel generators, install automatic switching cabinets, and reduce manual operations.
4. Regular inspection and maintenance of anti reverse power transmission devices: Electrical locking devices should undergo safety testing at least once a year to ensure their operational reliability.
