Method for avoiding false power loss of plant system of power plant
A technology on the low-voltage side of power plants and transformers, which is applied in the field of avoiding accidental power loss in power plant systems, and can solve problems such as potential safety hazards in safe operation of units, power loss, and inability to switch fast switching devices
Active Publication Date: 2021-02-05
XIAN THERMAL POWER RES INST CO LTD
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However, when a ground fault occurs in a branch of the factory transformer, according to the requirements in the "DLT 1502-2016 Guidelines for Setting Calculation of Factory Power Relay Protection", the action of stage I of the zero-sequence overcurrent protection will be blocked and fast-switching, and the fast-switching device cannot be switched. The factory uses a backup power supply to supply power, causing the whole factory to lose power, which brings a huge safety hazard to the safe operation of the unit
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[0014] The present invention is described in further detail below in conjunction with accompanying drawing:
[0015] refer to figure 1 and figure 2 , the method for avoiding power loss in the system of the power plant described in the present invention is in specific operation, the grounding fault of the plant transformer 1 is divided into two parts, the first part is the low-voltage side winding of the plant transformer and the low-voltage side winding of the plant transformer. The upper side of the plant incoming switch is connected to the closed bus 3, and the second part is the lower side of the plant incoming switch 4 and the plant bus 5;
[0016] According to the requirements in "DLT 1502-2016 Guidelines for Calculation of Factory Power Relay Protection Setting", the exit mode of transformer zero-sequence overcurrent protection is as follows: zero-sequence overcurrent protection section I acts on the branch circuit breaker and locks the backup power switch . Phase II...
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The invention discloses a method for avoiding false power loss of a plant system of a power plant, which comprises the following steps of: modifying the logic of a fast switching device, and matchingthe protection action time of a zero-sequence overcurrent protection section I and a zero-sequence overcurrent protection section II with the delay time of locking a fast switching signal to prevent the situation that when the lower side of a plant incoming switch and a plant bus are not grounded, the action of the zero-sequence overcurrent protection section I does not cause the locking of the quick switching device, i.e., when the bus side fails, the quick switching device is locked after tripping off the factory incoming line switch, and when the branch side of the factory transformer fails, the quick switching device is started after tripping off the factory incoming line switch, so that the false power loss of a factory system is avoided, and unnecessary loss is reduced.
Description
technical field [0001] The invention belongs to the technical field of electric power debugging and electric power testing, and relates to a method for avoiding accidental power failure of a power plant system. Background technique [0002] The factory system of a conventional power plant is composed of the factory working power supply, the factory standby power supply and the bus section. The incoming switch is connected to the busbar. [0003] When the factory working power supply loses power, the quick switching device switches to the factory standby power supply. However, when a ground fault occurs in a branch of the factory transformer, according to the requirements in the "DLT 1502-2016 Guidelines for Setting Calculation of Factory Power Relay Protection", the action of stage I of the zero-sequence overcurrent protection will be blocked and fast-switching, and the fast-switching device cannot be switched. The factory uses the backup power supply to supply power, caus...
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IPC IPC(8): H02H7/26H02H3/027H02J3/00
CPCH02H7/26H02H7/266H02H3/027H02J3/0073Y02P80/10Y02B70/30Y04S20/20
Inventor 王团结王美良员文康廖军林张少鹏何信林牛利涛雷阳
Owner XIAN THERMAL POWER RES INST CO LTD