A standby power supply device of a nuclear power unit and a control method thereof
A technology for backup power and nuclear power units, applied in circuit devices, emergency power supply arrangements, electrical components, etc., can solve the problems of unit state control and nuclear safety threats, high pressure on diesel engines, and long time consumption, to alleviate the problem of continuous operation. stress, improved recovery time, improved reliability
Inactive Publication Date: 2018-12-21
JIANGSU NUCLEAR POWER CORP
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Problems solved by technology
In the recovery stage of plant power supply, the power supply of the plant power supply of the accident unit was finally restored through the backup power supply, but it took a long time
In the first incident, it took about 3 hours to restore the power supply from the 220kV line to the start-up substation of the accident unit, and then restore the power supply to the factory power bus
In the second incident, it took about 3 hours from the start-up of the adjacent unit to restore the utility power supply to the accident unit through the contact cable.
[0004] Before the power supply of the plant is restored, the cooling power supply after the shutdown of the reactor can only be provided by the diesel engine of the unit and the emergency diesel engine. The operation pressure of the diesel engine is relatively high, and at the same time, it poses a great threat to the state control of the unit and nuclear safety.
Method used
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[0029] The technology of the present invention is further described below:
[0030] A backup power supply device for a nuclear power unit, comprising: No. 1 start-up transformer and No. 2 start-up transformer are connected through two sets of connecting cables, and the set of connecting cables are sequentially connected in series with medium voltage switch A1, tie switch A3, tie switch C13 and medium voltage switch I11; another group of contact cables are connected in series with medium voltage switch B2, contact switch B4, contact switch D14 and medium voltage switch J12; the No. The 6kV normal bus of Unit 1 is divided into sections 1 to 4; the 6kV normal bus of Unit 2 is arranged downstream of the No. 2 start-up transformer, and the 6kV normal bus of Unit 2 is divided into sections 1 to 4.
[0031]As mentioned above, one section on the 6kV normal bus of unit 1 is connected in parallel with a medium voltage switch R21 and a medium voltage switch D6; the two sections on the 6k...
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The invention belongs to the technical field of reserve power supply operation of a nuclear power plant, in particular to a reserve power supply device of a nuclear power unit and a control method thereof, comprising the following steps: the No. 1 start-up transformer and the No. 2 start-up transformer are connected through two sets of connection cables; one group of connecting cables is connectedin series with a middle voltage switch A, the connecting switch A, the connecting switch C and the middle voltage switch I in turn. The other group of connecting cables is connected in series with the middle voltage switch B, the connecting switch B, the connecting switch D and the middle voltage switch J in turn; 6kV normal bus bar of No. 1 unit is also arranged in the No. 1 start-up transformer, and the 6kV normal bus bar of No. 1 unit is divided into 1 to 4 sections; A 6kV normal bus bar of the No. 2 unit is arranged in the No. 2 start-up transformer, and the 6kV normal bus bar of the No.2 unit is divided into 1 to 4 sections. The invention can improve the reliability of the standby power supply of the nuclear power unit.
Description
technical field [0001] The invention belongs to the technical field of nuclear power plant backup power operation, and in particular relates to a nuclear power unit backup power device and a control method thereof. Background technique [0002] There have been two accidents of losing off-site power supply in a nuclear power plant since its commercial operation. The two accidents occurred during the maintenance of the 220kV backup power line or the 500kV main transformer. caused by. In the two incidents, the unit diesel engine and emergency diesel engine of the accident unit of the nuclear power plant were successfully started and loaded in stages, and the safe shutdown of the reactor and the cooling function after the shutdown were completed. [0003] Reviewing the process of the two accidents of losing off-site power supply, the power station is based on the conditions stipulated in Article S1.1 of the "Initial Conditions and Emergency Action Levels of a Nuclear Power Plan...
Claims
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IPC IPC(8): H02J9/06H02J9/08
CPCH02J9/066H02J9/08Y02B70/30Y04S20/20
Inventor 苏小军陈阳赵怀阔王伟韩辉马立
Owner JIANGSU NUCLEAR POWER CORP