DL 428-1991
Electric power system automatic under-frequency load-shedding Technical stipulation (English Version)
- Standard No.
- DL 428-1991
- Language
- Chinese, Available in English version
- Release Date
- 1991
- Published By
- Professional Standard - Electricity
- Status
- 2011-05
- Replace By
- DL/T 428-2010
- Latest
- DL/T 428-2010
- Scope
- In accordance with the requirements of the "Guidelines for Power System Safety and Stability", the power system must reasonably arrange the sequence of automatic low-frequency load shedding and the number of loads to be shed. When there is a shortage of active power in the entire system or in part of the system after decentralization, a sufficient number of minor loads can be automatically reduced according to the frequency drop in a planned manner to ensure safe operation of the system and uninterrupted power supply to important users. This technical regulation stipulates the basic requirements for automatic low-frequency load shedding of the system, the configuration of the device, the number of rounds, the setting of the starting frequency value of each round and the artificial additional delay, the number of loads cut per round and the basic content of the setting calculation. Recommendations have been put forward, but in view of the fact that in each regional power system, the combination of generating units (water, thermal, nuclear power units and power plant capacity size and proportion, unit adaptability to abnormal frequencies, etc.), grid structure and operation mode have great differences are different, so it needs to be used in combination with specific system conditions in actual implementation. The automatic low-frequency load reduction plan of the power system should be formulated and supervised by the system dispatching department. The dispatching department should re-examine it regularly and when there are major changes in system conditions. In order to accumulate experience, it is necessary to conduct analysis and summary work after each major active power shortage event or accident. Power supply departments at all levels should be responsible for the specific implementation according to the plan requirements. The number of automatic low-frequency load shedding devices needs to increase accordingly as the system power supply capacity increases. Accident manual low-frequency load shedding is a necessary supplement to automatic load shedding. When the power supply capacity is restored, the shedding load should be gradually restored manually or automatically. All relevant contents need to be clearly stipulated in the corresponding dispatch operation procedures. The design, infrastructure and production departments of the power system shall comply with and implement these regulations.
DL 428-1991 history
- 2011 DL/T 428-2010 Technical rules for power system automatic under-frequency load shedding
- 1991 DL 428-1991 Electric power system automatic under-frequency load-shedding Technical stipulation
DL 428-1991 Electric power system automatic under-frequency load-shedding Technical stipulation was changed to DL/T 428-2010 Technical rules for power system automatic under-frequency load shedding.
