Fault Handling Method of Distribution Network Using Zone Blocking
A technology for distribution network faults and processing methods, applied in the field of feeder automation, can solve problems such as leapfrog tripping, complex engineering settings, and insufficient communication speed, achieving the effects of simple settings and strong engineering practicability
Active Publication Date: 2018-06-29
XIAN XIRUI CONTROL TECH CO LTD
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Problems solved by technology
The feeder automation system in the surface protection mode realizes the feeder automation function by means of communication between intelligent switches. Due to the insufficient communication speed of RS485 and CAN, etc., there are leapfrog trips during the fault isolation process.
In addition, each smart switch in the surface protection needs to collect the information of all other smart switches in the protection range. When there are many smart switches in the protection range, such as when the protection range is the busbar of the switching station, all the IEDs corresponding to the outgoing lines are To be taken into account, not only the real-time and reliability requirements of the communication network are high, but also the engineering settings are complex, and when the structure of the distribution network changes, it needs to be reset
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[0032] The specific fault handling process of the present invention.
[0033] (1) Fault handling method of open-loop distribution network
[0034] by figure 2 Take the point F fault in the open-loop distribution network shown as an example, and the fault point is located between D13 and D14. The substation switch S1 does not have the function of an intelligent switch. S1 sets a 0.3s delay (a delay of a time difference) as the backup protection of this line. After a fault occurs, the direction of the fault current for D11 is Z (S1, D11) and flows to Z ( D12, D13), for D12 the fault current direction is Z (D11, D12, Z11) flowing to Z (D12, D13), for D13 fault current direction is Z (D12, D13) flowing to Z (D13, D14). Therefore, D11 sends X1 blocking signal to MAC (S1, D11) immediately after detecting the fault current (although S1 cannot receive it), D12 immediately sends X1 blocking signal to MAC (D11, D12, Z11) after detecting the fault current, and D13 detects Send X1 blo...
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The invention discloses a fault processing method applying regional blocking for a power distribution network. The fault processing method comprises the following steps of setting two GOOSE multi-cast addresses for each intelligent switch in the power distribution network, and simultaneously and respectively allocating the two GOOSE multi-cast addresses to a first power distribution region and a second power distribution region which are adjacent to each other and are connected with each intelligent switch; and sending a blocking signal to a first GOOSE multi-cast address from the intelligent switch between the two power distribution regions when a fault occurs in the power distribution network and current flows to the second power distribution region from the first power distribution region, and carrying out blocking by the intelligent switch in the first power distribution region corresponding to the first GOOSE multi-cast address after receiving the blocking signal. According to the fault processing method, the blocking signal is transferred through GOOSE communication during the fault processing process, the fault is rapidly isolated, and override trip cannot be generated; and moreover, the device is simple and high in engineering practicality.
Description
technical field [0001] The invention belongs to the technical field of feeder automation in the field of distribution automation, and in particular relates to a distribution network fault processing method using area blocking. Background technique [0002] The distribution network line is a multi-segment, multi-branch structure or a multi-level cascade structure such as switching stations and ring network cabinets. Due to the short power supply radius and large cross-section of wires, it is difficult for switches at all levels to achieve selectivity according to the magnitude of the short-circuit current. , and limited by the overcurrent time limit of the substation outlet, it is difficult to set the delay time limit to achieve selectivity. Therefore, when the line is faulty, the traditional overcurrent protection cannot accurately isolate the fault, let alone restore the power supply in the non-faulty area, and requires the help of the feeder automation system. [0003] Fe...
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IPC IPC(8): H02H7/26H02J3/00
CPCH02H7/262H02J3/00H02J3/001
Inventor 王根元郑飞张华
Owner XIAN XIRUI CONTROL TECH CO LTD