Brief introduction of 10kV distribution network au

2022-06-23
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Brief introduction to the 10kV distribution automation project in Hanshou City Abstract: this system can quickly eliminate the line outage caused by transient faults. In case of permanent fault, the fault section can be quickly isolated and the power supply of non fault section can be restored according to the predetermined action sequence

key words: fault handling ring protection configuration operation 1 functions and features (1) fault handling: the system can quickly eliminate line power failure caused by transient fault. In case of permanent fault, the fault section can be quickly isolated and the power supply of non fault section can be restored according to the predetermined action sequence. (2) Operation: remote and local manual operation modes can be realized. The remote operation is performed by the computer in the dispatching center, and the local manual operation is divided into two modes: remote control or insulated pull rod operation. (3) It can monitor, collect and store data of distribution system in real time. (4) Recloser controller 2gabb has its own control and protection functions. When the communication system and microcomputer management system fail, the line automatic control and protection functions will be realized as usual. (5) The outgoing circuit breaker of the substation, the original protection and reclosing are used to reduce the amount of funds and workload. 2 ring protection configuration and operation (1) ring protection coordination: the protection coordination process of the ring is illustrated by taking the ring of Hanyang line and Hancheng line as an example. When the loop operates normally, the sectionalized circuit breaker Hanyang 300 and Hancheng 300 are closed, and the liaison circuit breaker Chengyang 300 is disconnected. When the outgoing line of Hanyang section I is in short circuit or overcurrent fault, the circuit breaker trips, Hanyang 300 enters into delay opening state, and Chengyang 300 enters into delay closing state. Delay 1.2s circuit breaker 330 to reclose once, and Hanyang 300 and Chengyang 300 will be reset in time. If the fault is eliminated, the closing is successful; If the fault still exists, 330 is opened and locked. At 5S, Hanyang 300 is disconnected. At 8s, Chengyang 300 is closed, and Hanyang section II is restored to power supply. In case of short-circuit fault in Hanyang section II, circuit breaker 330 trips, Hanyang 300 enters delay opening state, and Chengyang 300 enters delay closing state. Delay 1.2 transport characteristics of particle activity and heat conduction regulation s, reclose once for 330, and time reset for Hanyang 300 and Chengyang 300. If the fault is eliminated, the closing is successful; If the fault still exists, circuit breaker 330 will be opened and locked. At 5S, Hanyang 300 will be opened and at 8s, Chengyang 300 will be closed. Since it is closed at the fault point, it will be opened and locked immediately. Then, manually close the outgoing circuit breaker of Hanyang line 330 to restore the power supply of Hanyang section I. In case of overcurrent fault in Hanyang section II, since the protection action setting value and action time (the outgoing circuit breaker of the substation is set to 0.5s and the sectional circuit breaker is set to 0.3s) of the sectional circuit breaker Hanyang 300 are less than the outgoing circuit breaker 330 of the substation, Hanyang 300 trips first and 330 remains in place. Chengyang 300 enters the delay closing state. After 3S delay, Hanyang 300 recloses once and Chengyang 300 resets in time. If the fault is eliminated, the closing is successful; If the fault still exists, Hanyang 300 will be opened and locked. At 8s, Chengyang 300 will be closed. Since it is closed at the fault point, it will be opened and locked immediately. Then manually close the 330 outgoing circuit breaker of Hanyang line to restore the power supply of Hanyang section I. (2) Operation of the ring: ① the circuit breaker is opened and locked due to fault. After the fault is eliminated, it can be operated manually. ② If a line needs to be powered off for maintenance without closing the tie circuit breaker, the sequence is to disconnect the disconnectors on both sides when the tie circuit breaker is disconnected, and then manually disconnect the outgoing circuit breaker of the substation. ③ If the outgoing circuit breaker of a line is disconnected, the section circuit breaker on the line will be disconnected and the contact circuit breaker will be closed in time delay. ④ The automatic action of the circuit breaker does not affect the manual operation of the circuit breaker. 3. Selection of main equipment (1) main circuit breaker: the ZW-10 column mounted dry vacuum circuit breaker of rural power station of Electric Power Research Institute is selected as the circuit breaker. Its technical parameters are: rated current 1250A; Rated short-circuit breaking current 20KA; Rated short-circuit breaking times: 30 times; Mechanical life (spring energy storage) 10000 times. The operating mechanism adopts the motor spring energy storage mechanism, which has the functions of electric and manual energy storage, electric and manual opening and closing, and overcurrent tripping. Fdkw-10 (f) outdoor drop type sectionalizer of rural power station of Electric Power Research Institute is selected as sectionalizer. Its action mode is "current counting type", which can disconnect the short-circuit current, and the counting times of short-circuit current can be set to 3 times at most. (2) Controller: the recloser control board and interface board adopt 2gabb microcomputer control device imported from British Rolls Royce company. Solvay operates in China. The device integrates control and protection, and has both remote and local functions. The voltage control device is developed by the electric power research institute to control the main circuit breaker to make it close with power delay and open with power loss delay. (3) Telecontrol part: the RTU adopts the dpm420 imported from app company of the United States to test its accuracy, which has the AC sampling capacity of three-phase voltage and three-phase current, and 4-way remote signaling

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